ROHM’s New PWM Controller ICs with SOP Package for Power Supply in a Wide Variety of Industrial Applications
Trade news

ROHM’s New PWM Controller ICs with SOP Package for Power Supply in a Wide Variety of Industrial Applications

　　ROHM has developed external FET-type controller ICs utilizing PWM current control mode optimized for AC-DC power supply in various industrial applications. Mass production has begun for four variants designed to drive a wide range of power semiconductors: the BD28C55FJ-LB for low-voltage MOSFETs, BD28C54FJ-LB for medium- to high-voltage MOSFETs, BD28C57LFJ-LB for IGBTs, and BD28C57HFJ-LB for SiC MOSFETs.　　Although the global semiconductor shortage is beginning to ease, the supply of semiconductor components for power supplies in industrial applications continues to lag behind demand. This is particularly true for PWM controller ICs, where the limited number of manufacturers has resulted in chronic shortages, leading to numerous requests for product development.　　In response, ROHM has developed PWM controller ICs that address the ongoing supply issue by meeting the industrial market’s stringent package and performance requirements. Depending upon the input AC voltage range of the application, a wide variety of semiconductors are used for power supply circuit. Each of these semiconductors demand different undervoltage lock out levels to prevent thermal runaway in case of supply/gate voltage drop. To solve this issue, ROHM has developed 4 variants with different undervoltage lock out levels.　　The new products feature an input voltage range of 6.9V to 28.0V, circuit current up to 2.0mA, maximum startup current of 75µA, and a maximum duty cycle of 50%, offered in the standard SOP-J8 package (equivalent to the JEDEC SOIC8). The products are pin to pin compatible to standard products commonly used in power supply circuits, thus reducing re-design and modification efforts. All variants are equipped with a self-recovery-type undervoltage lockout function (UVLO) with voltage hysteresis. This significantly improves application reliability by reducing the threshold voltage error to ±5%, compared to the typical ±10% of standard products.　　At the same time, these ICs are designated for long-term supply, thus ensuring continuous operation of long-life industrial equipment. Going forward, the lineup will be further expanded to include products suitable to drive high-voltage MOSFETs and GaN devices. More variants to support a maximum duty cycle of 100% are also being planned.　　Application ExamplesIndustrial equipment: AC-DC power supplies, motor drive inverters, and other AC-powered devices　　Product Information　　Applicable Part Nos: BD28C54FJ-LB, BD28C55FJ-LB, BD28C57HFJ-LB, BD28C57LFJ-LB　　TerminologyPWM Control Type　　Short for Pulse Width Modulation, a method for controlling power using semiconductors. The output power is controlled by varying the ratio of ON and OFF times within a fixed cycle.　　Duty Cycle　　The proportion of ON and OFF times as percentage of the switching period is known as ON- and OFF-duty cycle, respectively. It is common to refer to the ON-time ratio as the duty cycle. Duty Cycle (%) = Pulse Width (t) / Period (T).　　Self-Recovery Undervoltage Lockout Function (UVLO) with Voltage Hysteresis　　This function safety stops IC operation before the circuit inside the IC becomes abnormal when the input voltage drops below a threshold. For self-recovery types, the IC can become unstable by repeatedly stopping and starting near the threshold voltage, so a protection circuit with hysteresis is used to create a voltage difference between the stop and restart points.
Key word：
Release time：2024-10-08 14:42 reading：886 Continue reading>>
How to Discharge a Capacitor : A Step-by-Step Guide
Trade news

How to Discharge a Capacitor : A Step-by-Step Guide

　　Capacitors are essential components in electronic circuits, storing electrical energy for later use. However, when working with capacitors, it’s crucial to handle them properly to ensure safety and prevent damage. One important aspect of working with capacitors is “How to Discharge a Capacitor”. In this guide, we’ll walk you through the steps to safely discharge a capacitor, why it’s necessary, and the precautions you should take.　　What is capacitors?Before diving into the discharge process, it’s helpful to understand what capacitors are and how they function. A capacitor is an electrical component that stores and releases energy in the form of an electric charge. It consists of two conductive plates separated by an insulating material called a dielectric. When a capacitor is charged, it holds a voltage difference between its plates, which can persist even after power is disconnected.　　Why Discharge a Capacitor?1. Safety: Capacitors can retain a significant amount of charge even after the power is turned off. Discharging a capacitor is crucial to avoid electric shocks or damage to electronic components.　　2. Maintenance and Repair: When servicing electronic devices, discharging capacitors ensures that there are no residual charges that could interfere with repairs or adjustments.　　3. Circuit Design: In some cases, you might need to discharge a capacitor to reset or test electronic circuits.　　How to discharge a capacitor?1. Safety First: Power Off the Device　　– Unplug the Device: Ensure the device or circuit is completely disconnected from the power source. This is the most critical step in preventing electrical shocks.　　– Wait for a Safe Period: Even after disconnecting power, give the capacitor some time to self-discharge. However, don’t rely solely on this; always use proper discharge methods.　　2. Use Proper Discharge Tools　　– Discharge Tool: For high-voltage capacitors, it’s advisable to use a dedicated capacitor discharge tool, which often includes a resistor to safely dissipate the charge.　　– Insulated Tools: For lower-voltage capacitors, you can use insulated screwdrivers or pliers.　　3. Discharge Process　　– Connect the Discharge Tool: If using a discharge tool with a resistor, connect it across the capacitor’s terminals. If using a screwdriver, carefully touch the insulated handle to both terminals, ensuring you don’t touch the metal parts directly.　　– Hold for a Few Seconds: Allow the tool to stay in contact with the terminals for several seconds to ensure the capacitor is fully discharged.　　4. Verify the Capacitor is Discharged　　– Use a Multimeter: To confirm that the capacitor is completely discharged, use a multimeter to check the voltage across the terminals. A reading close to 0 volts indicates that the capacitor is safe to handle.　　5. Dispose of or Store Safely　　– Handling: Once discharged, handle the capacitor with care. If it’s to be reused, store it in a safe location where it won’t accidentally get recharged or come into contact with conductive materials.　　– Disposal: If you need to dispose of the capacitor, follow local electronic waste disposal regulations to ensure environmentally responsible handling.　　Precautions　　– Never Short the Terminals Directly: Directly shorting the capacitor terminals with a metal object can cause sparks, heat, and potential damage.　　– Use Insulated Equipment: Always use tools with proper insulation to avoid accidental electric shocks.　　– Handle with Care: Even discharged capacitors can have residual charges. Handle them carefully to avoid any accidental charge buildup.　　ConclusionDischarging a capacitor is a straightforward but essential task when working with electronic devices. By following these steps and taking the necessary precautions, you can ensure both your safety and the proper functioning of your electronic components. Always prioritize safety and use the appropriate tools to handle capacitors effectively. With these practices, you’ll be better equipped to handle capacitors in various electronic applications.
Key word：
Release time：2024-09-25 15:20 reading：936 Continue reading>>
ROHM's 4th Generation SiC MOSFET Bare Chips Adopted in Three EV Models of ZEEKR from Geely
Trade news

ROHM's 4th Generation SiC MOSFET Bare Chips Adopted in Three EV Models of ZEEKR from Geely

　　ROHM has announced the adoption of power modules equipped with 4th generation SiC MOSFET bare chips for the traction inverters in three models of ZEEKR EV brand from Zhejiang Geely Holding Group (Geely), a top 10 global automaker. Since 2023, these power modules have been mass produced and shipped from HAIMOSIC (SHANGHAI) Co., Ltd. - a joint venture between ROHM and Zhenghai Group Co., Ltd. to Viridi E-Mobility Technology (Ningbo) Co., Ltd, a Tier 1 manufacturer under Geely.　　Geely and ROHM have been collaborating since 2018, beginning with technical exchanges, then later forming a strategic partnership focused on SiC power devices in 2021. This led to the integration of ROHM’s SiC MOSFETs into the traction inverters of three models: the ZEEKR X, 009, and 001. In each of these EVs, ROHM’s power solutions centered on SiC MOSFETs play a key role in extending the cruising range and enhancing overall performance.　　ROHM is committed to advancing SiC technology, with plans to launch 5th generation SiC MOSFETs in 2025 while accelerating market introduction of 6th and 7th generation devices. What’s more, by offering SiC in various forms, including bare chips, discrete components, and modules, ROHM is able to promote the widespread adoption of SiC technology, contributing to the creation of a sustainable society.　　ZEEKR Models Equipped with ROHM’s EcoSiC™The ZEEKR X, which features a maximum output exceeding 300kW and cruising range of more than 400km despite being a compact SUV, is attracting attention even outside of China due to its exceptional cost performance. The 009 minivan features an intelligent cockpit and large 140kWh battery, achieving an outstanding maximum cruising range of 822km. And for those looking for superior performance, the flagship model, 001, offers a maximum output of over 400kW from dual motors with a range of over 580km along with a four-wheel independent control system.　　About ZEEKRZEEKR was launched in 2021 as the dedicated EV brand of Geely, a leading Chinese automaker that also owns well-established premium brands such as Volvo Cars and Lotus Cars. The name ZEEKR combines ZE, representing ZERO, the starting point of infinite possibilities, E for innovation in the electric era, and KR, the chemical symbol for krypton, a rare gas that emits light when energized. ZEEKR’s philosophy centers on harmonizing humanity, technology, and nature, aiming to redefine the perception of electric vehicles through innovative designs and technologies. The brand has garnered praise in markets outside of China, including in the US and Europe, for its impressive driving performance and range, with plans to expand sales to Western and Northern Europe.　　Please visit ZEEKR's website for more information: https://zeekrglobal.com/　　Market Background and ROHM’s EcoSiC™In recent years, there has been a push to develop more compact, efficient, lightweight electric systems to expand the adoption of next-generation electric vehicles (xEVs) and achieve environmental goals such as carbon neutrality. For electric vehicles in particular, improving the efficiency of the traction inverter, a key element of the drive system, is crucial for extending the cruising range and reducing the size of the onboard battery, heightening expectations for SiC power devices.　　As the world’s first supplier to begin mass production of SiC MOSFETs in 2010, ROHM continues to lead the industry in SiC device technology development. These devices are now marketed under the EcoSiC™ brand, encompassing a comprehensive lineup that includes bare chips, discrete components, and modules. For more information, please visit the SiC page on ROHM’s website: https://www.rohm.com/products/sic-power-devices 　　EcoSiC™ BrandEcoSiC™ is a brand of devices that utilize silicon carbide (SiC), which is attracting attention in the power device field for performance that surpasses silicon (Si). ROHM independently develops technologies essential for the evolution of SiC, from wafer fabrication and production processes to packaging, and quality control methods. At the same time, we have established an integrated production system throughout the manufacturing process, solidifying our position as a leading SiC supplier.　　EcoSiC™ is a trademark or registered trademark of ROHM Co., Ltd.　　Supporting InformationROHM is committed to providing application-level support, including the use of in-house motor testing equipment Additionally, by clicking on the URL below, users can access various supporting contents on ROHM’s website that facilitate the evaluation and introduction of 4th generation SiC MOSFETs, such as SPICE and other design models, simulation circuits for common applications (ROHM Solution Simulator), and evaluation board information.　　https://www.rohm.com/products/sic-power-devices/sic-mosfet#supportInfo
Key word：
Release time：2024-09-03 10:42 reading：918 Continue reading>>
simcom：MWC Shanghai 2024: A New Avenue for 5G Popularization
Trade news

simcom：MWC Shanghai 2024: A New Avenue for 5G Popularization

　　Under the theme "Future First," as we all know, 5G-Advanced is the next step in the evolution of cellular technologies, enabling advanced use cases for various verticals such as government and security, transportation, oil and gas, airlines and logistics, and healthcare to realize the full potential of 5G.　　As a hallmark technology of 5G evolution, RedCap has garnered extensive attention from the industry since its inception during MWC Shanghai. 5G RedCap offers advantages such as lowering the complexity, cost, size, and power consumption of 5G products. This not only fills the middle ground of 5G capabilities but also opens a new avenue for 5G to empower various industries.　　At MWC Shanghai, SIMCom aims at 5G ultra-high-speed scenarios and has the 5G module series SIM8270 and SIM8390, providing a maximum speed of over 10Gbps. These modules are suitable for applications that have strict requirements on speed and latency, such as broadband access, video monitoring and industrial control.　　Also, SIMCom has launched the SIM8230 and SIM8230-M2 series RedCap modules based on the Qualcomm platform. The SIM8230 module supports multi-frequency bands for 5G R17 SA, comes with a variety of functional interfaces for external device expansion, and boasts advantages such as lightweight, energy efficiency, compactness, and cost-effectiveness. It can be widely utilized in various domains including 5G CPE, wearable devices, industrial routers, high-definition streaming devices, AR/VR, drones, and remote-controlled robots.　　SIMCom has already fully deployed and accelerated the commercial scale of 5G RedCap. As market recognition of RedCap technology continues to increase, the popularization of 5G will further accelerate. SIMCom is committed to developing more diverse and reliable products based on advanced technology, promoting the large-scale commercialization of technologies like 5G RedCap, and contributing to the digital transformation and development of various industries with 5G technology.
Key word：
Release time：2024-08-27 15:56 reading：1241 Continue reading>>
Renesas Launches Ultra-Compact Sensor Module for Smart Air Quality Monitoring at Homes, Schools and Public Buildings
Trade news

Renesas Launches Ultra-Compact Sensor Module for Smart Air Quality Monitoring at Homes, Schools and Public Buildings

　　Renesas Electronics Corporation (TSE:6723), a premier supplier of advanced semiconductor solutions, today introduced an advanced all-in-one sensor module designed for indoor air quality monitoring. The RRH62000, the first multi-sensor air quality module from Renesas, integrates multiple sensor parameters in a compact design and accurately detects different particle sizes, volatile organic compounds, and gasses harmful to human health. With a Renesas microcontroller (MCU) on board, the module offers an intelligent sensor management solution for a growing market of air monitoring applications, including air purifiers, smoke detectors, HVAC systems, weather stations, and smart home systems. Its robust firmware also enables customer products to comply with various air quality standards around the world.　　The RRH62000 features one of the smallest footprints in its class of sensor modules, measuring only 46.6 x 34.8 x 12 mm. It packs Renesas’ RA Family MCU and seven sensor signals: the laser-based PM1/ 2.5/ 10 sensor, ZMOD4410 gas sensor, and the HS4003 humidity and temperature sensor. Together, these sensors can detect particulate matter, total volatile organic compounds (TVOC), estimated CO2, temperature, and humidity all in one system. All key components have been pre-integrated and fully calibrated at the factory, allowing developers to start their sensor system designs right out of the box.　　"Our RRH62000 module represents the next step in sensor fusion technology, which combines data from multiple sensors and turns it into comprehensive and actionable insights for environmental monitoring," said Uwe Guenther, Sr. Director, Modules and Solutions Product Line at Renesas. "We are dedicated to providing integrated sensing solutions that simplify development for customers and will continue to drive innovation in sustainable products that reduce environmental impact and enhance safety and comfort in our lives."　　Public interest in air quality and its effects on health has increased significantly since the COVID-19 pandemic. People are now more aware of how air pollutants can affect respiratory health and overall well-being. Less known is that pollutants are typically six to ten times more concentrated indoors than outdoors. These include dust, paint fumes, smoke from cooking, pollen, and particulates from HVAC filters, which can enter the respiratory system and cause lung damage, cancer, and other health problems.　　In order to meet these new challenges, Renesas’ new sensor module is equipped to monitor a broad range of air quality conditions. Using laser-based technology, which offers higher precision compared to conventional LED methods, it can monitor concentrations of PM1, PM2.5, and PM10 particulates -- particles with diameters of 0.3- to 10µm -- as well as absolute or relative TVOC measurements in different power mode settings, providing the highest level of accuracy for these pollutants. The RRH62000 delivers seven sensor outputs simultaneously, and its onboard MCU allows the system to detect surrounding air quality data in real time.　　The RRH62000 combo module comes with building standard firmware plus artificial intelligence (AI) algorithms, which lets engineers configure the sensors to conform to the requirements of various green air quality standards in public buildings, such as The Well Building Standard (WELL), Home Ventilating Institute (HVI) and RESET. With these features, for example, a school in China can use the same hardware as one in the U.S. or another location and simply update the AI-enabled firmware for its needs.　　Intelligent sensor devices, such as the Renesas RRH62000 and recently announced RRH46410 gas sensor module, can support demand-controlled ventilation, allowing HVAC systems to adjust airflow based on carbon dioxide levels and occupancy information to maintain optimal air quality and energy efficiency. Similarly, these modules use AI algorithms to predict when HVAC filters must be replaced or detect an anomaly before system failure occurs, significantly saving cost and time for system maintenance.　　Key Features of the RRH62000 All-in-One Sensor Module　　Up to 7 simultaneous sensor outputs　　Laser-based technology for accurate detection of PM1, PM2.5, PM10　　Metal oxide-based gas sensor　　Precise temperature and humidity sensor　　Absolute measurement of TVOC　　Estimated CO2 for low-cost CO2 room indication　　Ultra-compact size: 46.6 x 34.8 x 12mm to fit in many applications　　On-board MCU for smart sensor management　　Robust & Siloxane resistant　　Support I²C and UART communication　　Winning Combinations　　Renesas has combined the RRH62000 with numerous compatible devices from its portfolio to offer a wide array of Winning Combinations. This includes the In-home Air Quality Monitoring System and Air Quality Monitor (PM2.5) with Secure Cloud Connection, which combine the RRH62000 with the RA6M3 and RL78/G14 MCUs, and various power devices to enable cost-efficient, compact, modular solutions for modern appliances. These Winning Combinations are technically vetted system architectures designed from mutually compatible devices that work together seamlessly to bring an optimized, low-risk design for faster time to market. Renesas offers more than 400 Winning Combinations with a wide range of products from the Renesas portfolio to enable customers to speed up the design process and bring their products to market more quickly. They can be found at renesas.com/win.　　Availability　　The RRH62000 is available today along with the RRH62000-EVK evaluation kit. The RRH46410 and the RRH46410-EVK are also available. Please contact your local sales teams for more details. A blog about the new air quality sensor module is also available on the Renesas website.
Key word：
Release time：2024-08-26 14:10 reading：1581 Continue reading>>
BIWIN Wins India's
Trade news

BIWIN Wins India's "The Most Extensive Range Memory Solutions Provider" Award

　　June 28th had witnessed the successful hosting of the 16th NCN-ICT India Partner Summit 2024 at New Delhi, India. In the midst of the celebrations, BIWIN was honored with the esteemed “The Most Extensive Range Memory Solutions Provider of 2023 Award”, a reflection of its unwavering dedication to excellence and innovation.　　BIWIN is the Winner of “The Most Extensive Range Memory Solutions Provider of 2023”　　As an annual event that celebrates the achievements and contributions of key players in the ICT industry, the NCN-ICT Summit Awards brought together industry leaders, corporate executives, distributors, and resellers from India and abroad. It serves as a platform for industry professionals to gain insights into the latest innovations, share best practices, and explore new business opportunities.　　Through a combination of online voting and evaluations conducted by a panel of experts and judges, this accolade is a testament to BIWIN’s commitment to delivering a comprehensive range of high-performance memory solutions and pushing forward with innovation and product expansion.　　Recognized as a leader in the storage industry, BIWIN offers a comprehensive range of embedded flash-based storage solutions, including mobile phones, education devices, tablets, gaming machines, smart wearables, UAVs, action cameras, in-vehicle systems, DVR/NVRs, servers, OTT boxes, routers, and more. By providing tailored storage solutions, BIWIN supports innovation and advancement in these diverse technology areas.　　Attending on behalf of BIWIN, Rajesh Khurana, Country Manager for Consumer Business, was honored to participate in the NCN-ICT Summit & Awards Night 2024 and accept the awards. He expressed heartfelt gratitude for the industry recognition and committed to integrating purpose-driven initiatives into BIWIN’s future work. Khurana emphasized that these efforts will not only honor the awards but also elevate BIWIN to new industry heights.　　Rajesh Khurana was also privileged to be part of a renowned panel at the 16th Annual NCN-ICT Partners Summit, which was joined by top industry leaders from Geonix, Savex, Synersoft, Kaspersky and Micron. The discussion focused on the next big thing in ICT technology and examined the need for new business approaches, emerging ICT technologies, and changing business dynamics, as well as their impact on the vendor-partner ecosystem.　　As noted by Rajesh Khurana, industry projections indicate that the memory market is expected to experience continued growth in the coming years, especially with the advancement of AI technologies, big data and Internet of Things which set to drive the demand to new levels. BIWIN will also endeavor to provide improved memory solutions for customers while contributing to the industry’s future development.
Key word：
Release time：2024-08-20 13:46 reading：1213 Continue reading>>
GigaDevice GD32H7 Software Test Library (STL) Achieves TÜV Rheinland IEC 61508 Functional Safety Certification
Trade news

GigaDevice GD32H7 Software Test Library (STL) Achieves TÜV Rheinland IEC 61508 Functional Safety Certification

　　GigaDevice (Stock Code: 603986), a leading semiconductor company announced today that its GD32H7 Software Test Library (STL) has received the IEC 61508 SC3 (SIL 2/SIL 3) functional safety certification from TÜV Rheinland, an international independent testing, inspection, and certification organization. This marks the first STL certification awarded by TÜV Rheinland to a Chinese semiconductor company. By adopting the GD32H7 Software Test Library (STL), users can efficiently develop industrial applications that comply with international functional safety standards. This certification attests to GigaDevice's strong capabilities in developing industrial products and supporting software, demonstrating that GigaDevice's functional safety management has reached international standards.　　The certification ceremony was attended by Vincent Li, GigaDevice CTO and General Manager of MCU BU, and Bin Zhao, General Manager Cybersecurity & Functional Safety Greater China from TÜV Rheinland, along with other representatives from both companies.　　IEC 61508 is a globally recognized foundational standard for industrial functional safety. It provides a fundamental evaluation method for the entire safety lifecycle of electrical, electronic, and programmable electronic (E/E/PE) systems and products used in safety applications. The standard comprehensively covers all aspects including functional safety management, system, hardware, software phases, support processes, safety analysis, product reliability, and product release. It aims to control the risks associated with systematic failures and random hardware failures to an acceptable level. To conclude, IEC 61508 has already become a crucial reference standard in key industries such as industrial, energy, water transport, and railways etc. Obtaining this certification is essential for entering industries that require advanced functional safety.　　With the development of digitalization and intelligent technology, the importance of functional safety is increasing in industries such as industrial automation and digital energy. The GD32H7 Software Test Library (STL) with its exceptional detection capabilities, can accurately identify random hardware faults in safety-critical components like CPUs, SRAM, and Flash. This helps users flexibly utilize the GD32H7 series of ultra-high performance MCUs in developing complex computations, multimedia technologies, edge AI, and other advanced applications, significantly reducing safety risks. And the GD32H7 STL can be widely applicable to various end-user scenarios and can guarantee the reliability and safety of industrial applications. Besides, the Software Test Library will also be compatible with the GD32MCU that uses the same Arm® Cortex® M7 core. Furthermore, GigaDevice is actively advancing the certification of Software Test Library based on Arm® Cortex® M4 and Arm® Cortex® M33 cores, with plans to release soon. The significant initiatives will further strengthen GigaDevice's technological advantages in functional safety and meet the safety needs of various industry applications.　　Vincent Li, GigaDevice CTO and General Manager of MCU BU, stated: "GigaDevice is unwavering in the commitment to excellence in quality, adopting a quality policy that involves full employee participation and entire product lifecycle coverage. The industrial sector is an important strategic focus for us, where we place significant emphasis on the functional safety of products and applications. We are deeply appreciative to the professional team at TÜV Rheinland for their assistance and recognition. Obtaining IEC 61508 SC3 (SIL 2/SIL 3) certification is a significant milestone for GigaDevice in functional safety management. It will greatly enhance the safety and ease of developing industrial applications for our users. In the future, we plan to progressively integrate this international standard to a broader product line, continuously reinforcing the reliability of our products and software, while driving the advancement of industry functional safety standards."　　Bin Zhao, General Manager Cybersecurity & Functional Safety Greater China of TÜV Rheinland stated: "Congratulations to GigaDevice for becoming the first Chinese semiconductor company to receive the TÜV Rheinland STL certification! As an international third-party certification organization with a 150-year history, TÜV Rheinland is dedicated to providing technical support for the quality and safety of products and systems. During the project, our technical experts conducted a comprehensive safety verification of the GD32H7 STL throughout its lifecycle with a meticulous and responsible approach. We are very pleased to see that GigaDevice has met international standards in functional safety. In the future, we will continue to strengthen our collaboration to enhance the safety and reliability of GigaDevice's products, aiming to build outstanding market competitiveness."
Key word：
Release time：2024-08-19 15:48 reading：1875 Continue reading>>
Murata：Radisol Redefines Antenna Interference Countermeasures for Smartphones and Wearables
Trade news

Murata：Radisol Redefines Antenna Interference Countermeasures for Smartphones and Wearables

　　Murata Manufacturing Co. Ltd announces the launch of Radisol – an innovative product designed to suppress interference between nearby antennas with low insertion loss, improving isolation and antenna radiation efficiency. This world-first solution is specifically engineered to meet the demands of compact modern devices like smartphones and wearables, offering benefits such as reduced power consumption, miniaturized construction, and enhanced communication quality. In addition, Radisol has been adopted by Motorola Mobility LLC (Headquarters: Libertyville, Illinois, USA, President: Sergio Buniac), in the new Edge series of smartphones scheduled to be released in August 2024. Motorola has realized a method of improving the characteristics of Wi-Fi® antennas by using Radisol.　　As the demand for smaller smartphones and wearable devices grows, the number of antennas is also increasing to accommodate the expanding range of communication methods and bands. Additionally, MIMO technology to improve communication quality and speed is encouraging an increase in the number of antennas, while new designs such as foldable smartphones are encouraging antenna crowding. This has posed new difficulties, specifically the implications on antenna isolation and the decline in antenna effectiveness, as the interference of nearby antennas leads to a decrease in radiation efficiency.　　Although discrete filters are a common solution for improving antenna isolation, they are not suitable when communication bands are closely situated, as insertion loss can impair antenna performance and occupy valuable board space. To address these challenges, Murata has created Radisol, a low-loss filter for antenna area that uses Murata’s unique ceramic multilayer technology and RF circuit design technology.　　Antenna engineers usually construct a filter circuit using discrete L and C chip components to implement effective countermeasures. Instead, Radisol is just a single 0603-sized component that resolves the persisting challenges of antenna performance and packaging constraints. It effectively suppresses antenna interference, without significantly impacting the passband, and results in enhanced radiation efficiency and reduced power consumption.　　Each Radisol component operates as a dedicated filter circuit designed specifically to mitigate the antenna interference associated with a specific communication band. The compact component integrates one capacitor and two inductors, providing band-stop filter characteristics within a single chip. Radisol features a unique design that utilizes the generation of lossless mutual inductance by two magnetically coupled coils. This setup forms a band-stop circuit with no notable insertion loss in the communication band. This specialized approach to antenna isolation enables Radisol to offer enhanced performance, with low insertion loss and high efficiency and system integration.　　Included in the Radisol family are variants designed to effectively address the needs of common bands, including 2G & 5G Wi-Fi® as well as GPS signals. This eliminates the necessity of designing discrete filter circuits, simplifying the implementation of countermeasures. Murata will continue to expand upon the initial product lineup to further meet market demands and drive further innovation in antenna technology.　　“By using Radisol engineers can address the challenges of modern communication devices without compromising signal integrity and radiation efficiency,” said Satoru Muto, General Manager of New Business Incubation Department at Murata. “By utilizing Murata's cutting-edge technology, this solution takes integration to a whole new level, eliminating the need for complex discrete filter circuits and saving valuable space.”　　Radisol samples are available for evaluation and mass production has already begun in June 2024. To learn more about Radisol or to request samples, please contact your local Murata representative or visit here.
Key word：
Release time：2024-08-14 13:39 reading：1030 Continue reading>>
Varistor and Thermistor: What Sets Them Apart
Trade news

Varistor and Thermistor: What Sets Them Apart

　　Varistors and thermistors are two specialized resistors that break the mold of their traditional counterparts. While standard resistors offer constant opposition to current flow, varistors and thermistors are dynamic. Varistors act as voltage guardians, changing resistance to safeguard circuits from harmful surges. Thermistors, on the other hand, are temperature detectives, their resistance fluctuating with heat.　　This blog explores the unique functionalities of varistors and thermistors, highlighting the key characteristics that differentiate them within the vast world of electronic components.　　Varistor: The Voltage Dependent Resistor　　A varistor, also known as a Voltage Dependent Resistor (VDR), is a special type of resistor whose resistance varies depending on the applied voltage. Under standard operating voltage, a varistor exhibits high resistance, acting like an open circuit. However, the varistor's resistance drops dramatically when a voltage surge exceeds a specific threshold. This sudden change allows excess current to flow through the varistor, diverting it away from sensitive circuit elements and protecting it from damage.　　Varistors' common applications include protecting AC power lines and safeguarding electronic devices from transient voltage spikes caused by lightning strikes or power grid fluctuations.　　Thermistor: The Temperature Sensitive Resistor　　In contrast to varistors, thermistors are all about temperature. These components are essentially temperature-sensitive resistors (TSRs) whose resistance value changes significantly with fluctuations in temperature. There are two main types of thermistors:　　PTC (Positive Temperature Coefficient): As the name suggests, the resistance of a PTC thermistor increases with rising temperature. These are often used in resettable fuses or self-regulating heating elements.　　NTC (Negative Temperature Coefficient): Conversely, NTC thermistors exhibit a decrease in resistance as the temperature climbs. These are commonly employed in temperature sensors, fever thermometers, and temperature control systems.　　Thermistors offer a wide range of applications in various industries. From monitoring engine coolant temperature in automobiles to regulating battery temperature in laptops, NTC thermistors play a vital role in ensuring optimal operation. On the other hand, PTC thermistors are used in circuit protection scenarios where a surge in temperature can trigger a safety response.　　Differences Between Varistors and Thermistors　　While both varistors and thermistors are crucial components, their functionalities and operating principles differ significantly:　　Electrical Properties: Varistors exhibit non-linear resistance, dramatically changing based on voltage. Thermistors, on the other hand, display a more linear relationship between resistance and temperature.　　Material Composition: Varistors are typically made of metal oxide ceramics, while thermistors can be constructed from various materials like ceramic semiconductors, polymers, or even thermistor beads.　　Response to Environmental Factors: Varistors react to voltage spikes, while thermistors are sensitive to temperature variations.　　Application Areas: Varistors excel in transient voltage protection, while thermistors shine in temperature sensing and control applications.　　Varistor vs. Thermistor: When to Use Which?　　Choosing between a varistor and a thermistor depends on the specific needs of your circuit:　　Voltage Protection: A varistor is an ideal choice if your circuit requires protection from voltage spikes and transients.　　Temperature Sensing: When accurate temperature measurement or control is crucial, NTC or PTC thermistors are the preferred components.　　For example, a power supply circuit would likely utilize a varistor to safeguard against potential lightning strikes. At the same time, a battery pack might incorporate an NTC thermistor to monitor internal temperature for safety purposes.　　Comparing Varistor and Thermistor Circuits　　A simple circuit demonstrating a varistor application could involve connecting it in parallel with a sensitive electronic device across the power supply. In the event of a voltage surge, the varistor's resistance drops, diverting the excess current and protecting the device.　　On the other hand, a thermistor circuit for temperature sensing might involve placing it in series with a current source. As the temperature rises, the thermistor's resistance decreases, causing a change in the current flow, which can be measured to determine the temperature.
Key word：
Release time：2024-07-25 11:04 reading：960 Continue reading>>
What are TVS diodes in safeguarding electronics
Trade news

What are TVS diodes in safeguarding electronics

　　In today’s interconnected world, electronic devices and systems are ubiquitous, powering our homes, workplaces, and communication networks. However, these devices are vulnerable to voltage transients—brief surges in voltage that can occur due to lightning strikes, electrostatic discharge (ESD), or switching transients in the electrical system.　　To protect sensitive electronic components from such transients, Transient Voltage Suppressor TVS diodes play a crucial role. This article explores the functionality, applications, and importance of TVS diodes in safeguarding electronics.　　What is a Transient Voltage Suppressor (TVS) Diode?A Transient Voltage Suppressor (TVS) diode is a semiconductor device used to protect sensitive electronic components from voltage spikes or transient voltages that could potentially damage them. These spikes can be caused by events such as lightning strikes, electrostatic discharge (ESD), or switching transients in the electrical system.　　The TVS diode operates by providing a low-impedance path to divert excess voltage away from the protected components, thus limiting the voltage across them. When a transient voltage exceeds the breakdown voltage (also known as the clamping voltage or avalanche voltage) of the TVS diode, it starts to conduct, effectively shunting the excess current away from the protected circuit.　　What are the features of TVS diodes?Fast Response Time: TVS diodes respond quickly to transient events, providing protection within nanoseconds to microseconds.　　Low Clamping Voltage: The clamping voltage is the maximum voltage that the TVS diode allows to pass through to the protected circuit. It is typically lower than the voltage tolerance of the protected components, ensuring they remain safe.　　High Surge Current Capability: TVS diodes are designed to handle high surge currents associated with transient events, protecting the circuit from damage.　　Low Leakage Current: When not conducting, TVS diodes have low leakage current, minimizing power consumption and ensuring minimal impact on the protected circuit during normal operation.　　Robustness: TVS diodes are robust devices, able to withstand multiple transient events without degradation in performance.　　What are the applications of TVS diode?TVS diodes are commonly used in various applications, including:　　Protection of integrated circuits (ICs), microcontrollers, and other semiconductor devices from ESD and voltage transients.　　Protection of communication ports (such as USB, Ethernet, HDMI) and data lines in electronic equipment.　　Surge protection for power supply lines, signal lines, and sensor inputs in industrial and automotive electronics.　　Protection of sensitive electronic equipment against lightning-induced surges in telecommunications, power distribution, and other infrastructure.　　What’s the difference between TVS Diodes and Zener Diodes?TVS (Transient Voltage Suppressor) diodes and Zener diodes are both semiconductor devices used for voltage regulation, but they serve different purposes and operate in different ways. Here are the key differences between TVS diodes and Zener diodes:　　Purpose:　　• TVS Diodes: TVS diodes are primarily used for transient voltage suppression, meaning they protect electronic circuits from voltage spikes or transients caused by events like lightning strikes, electrostatic discharge (ESD), or inductive switching. Their main function is to provide surge protection and prevent damage to sensitive components.　　• Zener Diodes: Zener diodes are used for voltage regulation and voltage reference. They operate in the breakdown region and maintain a constant voltage across their terminals when reverse biased. Zener diodes are commonly used in voltage regulation circuits, voltage clamping circuits, and voltage reference circuits.　　Operating Principle:　　• TVS Diodes: TVS diodes operate by avalanche breakdown or Zener breakdown. When the voltage across a TVS diode exceeds its breakdown voltage, it starts to conduct heavily, providing a low-impedance path for excess current and diverting it away from the protected circuit.　　• Zener Diodes: Zener diodes operate in the reverse-biased breakdown region, where they maintain a constant voltage (known as the Zener voltage) across their terminals. They regulate voltage by allowing current to flow in the reverse direction when the applied voltage exceeds the Zener voltage.　　Voltage Characteristics:　　• TVS Diodes: TVS diodes typically have a very low clamping voltage (Vc) and are designed to handle high surge currents associated with transient events. They are optimized for fast response times and high-energy absorption capabilities.　　• Zener Diodes: Zener diodes have a well-defined breakdown voltage (Vz) at which they operate. The voltage across a Zener diode remains relatively constant over a wide range of currents when reverse biased, making them suitable for voltage regulation applications.　　Applications:　　• TVS Diodes: TVS diodes are used in applications requiring protection against voltage transients, such as in power supplies, communication ports (USB, Ethernet), data lines, and electronic equipment exposed to harsh environments or prone to ESD.　　• Zener Diodes: Zener diodes find applications in voltage regulation circuits, voltage references, voltage clamping circuits, reverse voltage protection, and precision voltage measurement circuits.　　How do TVS diodes work?　　TVS diodes work by providing a low-impedance path for excess voltage, diverting it away from sensitive electronic components and limiting the voltage across them to safe levels. They operate based on two main mechanisms: avalanche breakdown and Zener breakdown. Here’s how TVS diodes work:　　Avalanche BreakdownTVS diodes are typically fabricated with a highly doped semiconductor material that has a narrow depletion region. When the diode is reverse-biased (i.e., the voltage applied across it is in the opposite direction of its normal operation), the electric field across the depletion region increases.　　If the applied reverse voltage exceeds a certain threshold known as the breakdown voltage (also called clamping voltage or avalanche voltage), the strong electric field can accelerate charge carriers (electrons and holes) to high energies.　　These high-energy charge carriers collide with other atoms in the semiconductor lattice, generating additional charge carriers through impact ionization. This process cascades, resulting in a sudden increase in current flow through the diode.　　As a result, the TVS diode effectively clamps the voltage across its terminals at the breakdown voltage, providing a low-impedance path for excess current and limiting the voltage seen by the protected circuit.　　Zener BreakdownIn addition to avalanche breakdown, some TVS diodes may also utilize Zener breakdown to provide transient voltage suppression. Zener breakdown occurs when the reverse-biased diode operates in its Zener breakdown region.　　In this region, the diode behaves as a voltage regulator, maintaining a relatively constant voltage (known as the Zener voltage) across its terminals. When the applied reverse voltage exceeds the Zener voltage, the diode starts conducting heavily, effectively clamping the voltage across it.　　What causes a TVS diode to fail?TVS diodes are designed to withstand high levels of transient voltage and provide protection to sensitive electronic components. However, like any electronic component, TVS diodes can fail under certain conditions. Here are some common causes of TVS diode failure:　　Overvoltage Conditions: If the transient voltage exceeds the maximum rated clamping voltage (avalanche or Zener breakdown voltage) of the TVS diode, it may fail to suppress the transient effectively. This can happen if the transient event is exceptionally severe or if the TVS diode is underspecified for the application.　　Overcurrent Conditions: Excessive current flowing through the TVS diode, either due to a high-energy transient event or a sustained fault condition, can cause the diode to fail. Overcurrent can lead to thermal overstress, causing the diode to overheat and potentially short or open circuit.　　Reverse Polarity: Applying a reverse voltage beyond the maximum reverse voltage rating of the TVS diode can cause it to fail. This can occur due to improper installation or incorrect wiring in the circuit.　　End-of-Life Wear-Out: Like all semiconductor devices, TVS diodes have a limited lifespan, and their performance may degrade over time due to factors such as aging, temperature cycling, and electrical stress. As the diode approaches the end of its life, its ability to suppress transients effectively may diminish, leading to failure.　　Excessive Power Dissipation: TVS diodes are specified with maximum power dissipation ratings. Exceeding these ratings, either due to sustained overvoltage conditions or prolonged exposure to transient events, can cause the diode to overheat and fail.　　Manufacturing Defects: Rarely, TVS diodes may fail due to manufacturing defects such as material impurities, processing errors, or incomplete encapsulation. These defects can compromise the electrical and thermal performance of the diode, leading to premature failure.　　Improper Handling or Installation: Mishandling or improper installation of TVS diodes, such as mechanical stress during assembly, soldering defects, or exposure to corrosive environments, can lead to physical damage or degradation of the diode, resulting in failure.　　ConclusionTVS diodes are essential components in protecting electronic devices and systems from voltage transients. Their ability to clamp voltages and divert excess current away from sensitive components plays a vital role in ensuring the reliability and durability of modern electronics. As the demand for high-performance and reliable electronic products continues to grow, the importance of TVS diodes in safeguarding electronics will only increase, making them indispensable in today’s interconnected world.
Key word：
Release time：2024-07-16 13:08 reading：936 Continue reading>>

Turn to

/ 85

Popular categories
Semiconductors Circuit Protection Electromechanical Embedded Solutions Connectors, Interconnects Sensors, Transducers Optoelectronics Development Kits Test and Measurement Power Fans, Thermal Management Boxes, Enclosures, Racks Cables, Wires Passive Components Others
  • Week of hot material
  • Material in short supply seckilling
model brand Quote
TL431ACLPR Texas Instruments
RB751G-40T2R ROHM Semiconductor
MC33074DR2G onsemi
BD71847AMWV-E2 ROHM Semiconductor
CDZVT2R20B ROHM Semiconductor
model brand To snap up
BU33JA2MNVX-CTL ROHM Semiconductor
TPS63050YFFR Texas Instruments
IPZ40N04S5L4R8ATMA1 Infineon Technologies
BP3621 ROHM Semiconductor
ESR03EZPJ151 ROHM Semiconductor
STM32F429IGT6 STMicroelectronics
Hot labels
ROHM
IC
Averlogic
Intel
Samsung
IoT
AI
Sensor
Chip
Original authorized brand
More Licensed Brands>>
Information leaderboard
  • Week of ranking
  • Month ranking

About us

Qr code of ameya360 official account

Identify TWO-DIMENSIONAL code, you can pay attention to

AMEYA360 mall (www.ameya360.com) was launched in 2011. Now there are more than 3,500 high-quality suppliers, including 6 million product model data, and more than 1 million component stocks for purchase. Products cover MCU+ memory + power chip +IGBT+MOS tube + op amp + RF Bluetooth + sensor + resistor capacitance inductor + connector and other fields. main business of platform covers spot sales of electronic components, BOM distribution and product supporting materials, providing one-stop purchasing and sales services for our customers.

Please enter the verification code in the image below：

verification code