ROHM Industry’s highest rated power shunt resistors in the 0508 size
ROHM has recently developed wide terminal shunt resistors, LTR10L. They are optimised for a variety of applications in the automotive, industrial, and consumer sectors, while also strengthening the considerable lineup with two updated general-purpose MCR series shunt resistors (MCR10L and MCR18L).
In recent years, high efficiency operation is required from the viewpoint of energy conservation – not only in battery-driven applications such as mobile devices and EVs, but in consumer and industrial equipment as well powered by electrical outlets. For high 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 utilising higher board densities are demanding even smaller shunt resistors. To meet these needs, the new LTR10L series delivers the industry's highest rated power and best-in-class temperature coefficient of resistance (TCR) in a compact 0508-size (0.5inch × 0.8inch) / 1220-size (1.25mm × 2.0mm) that contributes to both high reliability and greater miniaturisation.
Improving the resistive element material and applying terminal temperature derating method allowed LTR10L to deliver an industry-leading 1W rated power in the 0508-size - 88% smaller than existing products. In addition, high-accuracy ±0.5% resistance tolerance has been achieved, together with best-in-class TCR and anti-sulfuration characteristics. These features make them ideal for applications exposed to harsh conditions, including telecommunication base stations requiring high durability and automotive LED headlamps that demand high accuracy current sensing along with long-term reliability. On the other hand, the MCR10L and MCR18L series of general-purpose shuntresistors utilise an improved element structure and materials to increase rated power to 0.5W and 0.75W, respectively, over their conventional MCR series rated power (0.25W). Higher rated power enables the same performance in a smaller size, contributing to product miniaturisation.
Going forward, ROHM will continue to expand its lineup of resistors (its founding products) that leads to improved miniaturisation and reliability while striving to ensure long-term stable supply.
The new products are ideal for a wide range of circuits requiring current detection for motors, batteries, and LCDs in the automotive, industrial equipment, and consumer device sectors.