Reliable metal alloy resistors for current sensing in industrial, medical and automotive applications

TT Electronics offers a new LRMAP5930 series of low resistance, metal alloy current sense power resistors. With values down to 200µOhm and a corresponding power rating on standard FR4 PCB of up to 10W, the maximum measurable current is over 200A, and so in most cases limited only by the capacity of the PCB tracks. A 50% higher power rating of 15W can be reached for assemblies mounted on a thermal substrate such as direct bonded ceramic or insulated metal substrate, making these resistors suitable for hybrid modules. Aimed at designers of motor drives and power supplies in the automotive, industrial, and medical industries, these high power shunt resistors are ideal in the specific areas of regulating current flow, detecting stalled motors and particularly, measuring power consumption. The growth of electrical drives and actuators in industrial and automotive applications has witnessed a parallel growth in the need to monitor and minimise energy usage. The series is AEC-Q200 qualified for the automotive market while other applications include power supplies, battery monitoring and process control.