The devices 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 those 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 minimises 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.
These products are available on online purchase and can be purchased through online distributors such as DigiKey, Mouser and Farnell.
As part of its future expansion plans, ROHM has also commenced the 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.
