Rohm updates 0508 sized power shunt resistors
Wide terminal shunt resistors and two updated general purpose shunt resistors have been added to the range available from Rohm. The LTR10L is a series of wide terminal shunt resistors, optimised for a variety of applications in the automotive, industrial, and consumer sectors, said the company. It has also added two updated general-purpose MCR series shunt resistors, the MCR10L and MCR18L.
Designers and developers favour high efficiency operation in battery-driven applications, such as mobile devices and EVs, as well as in consumer and industrial equipment and electrical outlets. For energy saving efficiency, it is important to accurately detect parameters such as current and voltage in order to operate devices optimally. This requires shunt resistors that combine high accuracy with high reliability current detection. At the same time, manufacturers of applications using higher board densities are demanding smaller shunt resistors, said Rohm, explaining the reason for introducing the LTR10L series. This is claimed to be the industry’s highest rated power and best-in-class temperature co-efficient of resistance (TCR) in a compact 0508-size (0.5 x 0.8inch) / 1220-size (1.25 x 2.0mm).
Rohm improved the resistive element material and applied terminal temperature derating which resulted in the 1W rated power in the 0508-size. This is 88 per cent smaller than existing products, claimed the company. It added that high-accuracy ±0.5 per cent resistance tolerance has been achieved, together with best-in-class TCR and anti-sulfuration characteristics. These features make the resistors suitable for applications exposed to harsh conditions, including telecommunications basestations which require high durability and automotive LED headlamps that demand high accuracy current sensing and long-term reliability.
The MCR10L and MCR18L general purpose shunt resistors use an improved element structure and materials to increase rated power to 0.5 and 0.75W, respectively, over the conventional MCR series rated power (0.25W). Higher rated power enables the same performance in a smaller size, which allows the end product to be smaller.
