LTR100L Series Resistor

ROHM's LTR100L series thick-film shunt resistors 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.

Energy savings in the industrial and consumer fields have been emphasized in recent years, with concentrated efforts 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 increase in power.

The LTR100L series achieves high rated power of 4 W in the 3264 size (3.2 mm x 6.4 mm)/1225 size (0.12 inch x 0.25 inch) by revising resistor materials and applying terminal temperature derating. This is about twice that of conventional products in the same size, making them ideal for current detection in motor control and overcurrent protection circuits for industrial and consumer applications, which are progressing towards higher power. In addition, optimization of the element structure delivers excellent temperature coefficient of resistance (TCR) characteristics among thick-film shunt resistors. As a result, they are not easily affected by temperature, enabling high accuracy and high-reliability current detection.

The LTR100L series achieves excellent TCR characteristics of less than 300 ppm/°C (at 10 mΩ resistance value products) within the operating temperature range through an optimized element structure. This reduces the change in resistance value due to temperature changes compared with standard products by 50% to 65%, enabling high accuracy current detection that improves application reliability.