New thick-film shunt resistors from Rohm Semiconductor are optimized for industrial and consumer applications. Often used to detect current in battery protection and motor drive circuits, shunt resistors require higher accuracy to improve reliability and ensure high efficiency operation.

Emphasis on energy savings in the industrial and consumer fields is increasing, with efforts being made to reduce power consumption during drive operation by using motor inverters. At the same time, protection circuits are becoming more important in these fields as applications continue to increase in power. Rohm has expanded its lineup of thick-film shunt resistors to support an even higher power area.

The LTR100L series achieves the industry’s highest rated power of 4 W in the 3264 size (3.2 mm × 6.4 Source: Rohm SemiconductorSource: Rohm Semiconductor mm)/1225 size (0.12 inch × 0.25 inch) by revising resistor materials and applying terminal temperature derating. This makes them ideal for current detection in motor control and overcurrent protection circuits for industrial and consumer applications, which are progressing toward higher power. In addition, optimization of the element structure delivers best-in-class temperature coefficient of resistance characteristics among thick-film shunt resistors. As a result, they are not easily affected by temperature — enabling high accuracy, high reliability current detection.

The LTR100L series features a thick-film structure that makes it relatively easy to expand the resistance value range. Application examples include:

  • Industrial equipment (factory automation, motor peripheral circuits, power supplies)
  • Consumer appliances (air conditioners, washers, refrigerators, vacuum cleaners)
  • Other (two-wheel vehicle headlamps, electric scooters)
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