Wide terminal shunt resistors, or LTR10L, have recently been developed by ROHM. They have been optimised for a variety of automotive, industrial, and consumer applications, and two new general-purpose MCR series shunt resistors have been added to the extensive lineup (MCR10L and MCR18L). From the perspective of energy conservation, high-efficiency operation is required in electrical outlets, consumer and industrial equipment, as well as battery-driven applications like mobile devices and electric vehicles. To run devices optimally, it is critical to precisely detect parameters, such as current and voltage. Shunt resistors with high precision and high reliability current detection are required for this. Manufacturers of applications with increased board density are also requesting even smaller shunt resistors at the same time. In order to meet these objectives, the new series offers the best-in-class TCR and the industry’s highest-rated power in a small package with a 0508-size (0.5″ 0.8″)/1220-size (1.25mm 2mm) that promotes excellent reliability and further miniaturisation.
The resistors were able to offer an industry-leading 1W rated power in the 0508-size, which is 88% smaller than competing goods, by improving the material of the resistive element and using a terminal temperature derating approach. Additionally, best-in-class TCR and anti-sulfuration properties have been realised, along with high precision 0.5% resistance tolerance. They are ideal for applications that must withstand extreme conditions, such as telecommunication base stations that demand high durability and automotive LED headlamps that need high-accuracy current sensing and long-term reliability, thanks to these capabilities. The rated power of the general-purpose shunt resistors in the MCR10L and MCR18L series, however, has been improved to 0.5W and 0.75W, respectively, over that of the MCR series using an upgraded element structure and materials (0.25W). Power ratings that are higher enable the same performance in a smaller package, which aids in product miniaturisation. The new devices are fantastic for a wide range of circuits in the automotive, industrial equipment, and consumer device industries that require current sensing for motors, batteries, and LCDs.