Industry’s Highest* Rated Power! ROHM Unveils the UCR10C Series of Sintered Metal Shunt Resistors

　　ROHM has developed the “UCR10C Series”, which has the industry's highest rated power for 2012-size shunt resistors (10 mΩ to 100 mΩ).

　　Shunt resistors are required to handle higher power for current sensing in both the automotive and industrial equipment markets. Additionally, specific requirements for high junction reliability in these markets has increased annually.

　　ROHM’s new products form a copper-based resistive element on an alumina substrate via sintering. By optimizing the heat dissipation structure, it achieves rated powers of 1.0W and 1.25W-double that of equivalent-sized products including thick film types and metal plate types. This enables the replacement of products with wide terminal types or larger alternatives, facilitating miniaturization and reducing the number of components required.

　　Furthermore, the use of a metal resistive element achieves a low TCR (0 to +60 ppm/°C). This minimizes errors due to temperature changes, enabling high-precision current sensing. Moreover, it achieves the same level of durability as the metal plate types in temperature cycle testing (-55°C / +155°C, 1000 cycles). This ensures high bonding reliability even in applications with extreme temperature fluctuations, such as automotive use, enabling stable, long-term operation.

　　This series is fully lead-free. No lead materials are present, even in RoHS-exempted areas, thus reducing environmental impact.

　　As part of its future expansion plans, ROHM has also commenced development of the 3216-size (2W) sintered metal shunt resistor, the “UCR18C Series”, further enhancing its product line-up that combines high power, high precision and high reliability.

　　Application Examples

　　Various current detection applications in automotive, industrial equipment, and consumer electronics.

　　Terminology

　　Thick Film Types

　　A chip resistor using a material called metal glaze as the resistive element. In addition to cost advantages, the thick film resistive element provides superior resistance to pulses and surges.

　　Metal Plate Types

　　A chip resistor using a metal plate as the resistive element. It offers superior thermal dissipation and achieves high precision through low TCR, providing performance advantages.

　　Wide Terminal Types

　　A structure where the electrodes are positioned along the long side of the chip resistor body. Compared to the common structure with electrodes along the short side, it improves heat dissipation efficiency and enables high-power handling.

　　TCR (Temperature Coefficient of Resistance)

　　An indicator showing how much a resistor's resistance value changes with temperature. A lower value means less resistance variation due to temperature fluctuations, providing more stable performance.

　　The TCR of the UCR10C varies depending on the resistance value. Furthermore, the listed TCR is the guaranteed value for the +25/+155°C range for the 10mΩ product.