High-power low-ohmic SM shunt resistors for automotive, industrial use
The shunt resistors are characterised by a high rated power of 3W and a resistance range from 5 mΩ to 220 mΩ. Their resistance tolerance is specified with F (±1 %). Temperature coefficient of resistance (TCR) is ±20 ppm/°C. The GMR100 series measures 6.4 x 3.2 x 0.4 mm (L x W x H). Operating temperature range is between -55 °C and +170 °C. The resistance range represents a higher-resistance alternative to the company’s PSR series (0.1 mΩ to 3 mΩ).
Surface temperature rise is reduced by 45% compared with conventional products. As a result, the shunts achieve stable resistance, not only during normal operation but als with overcurrent loads. Use of a high-performance alloy as the resistive metal results in excellent temperature coefficient of resistance (TCR) even in the low resistance region, which in turn ensures greater accuracy and reliability. A special structure supports a lower profile form factor of 0.4 mm, making the GMR100 series 47% thinner than existing solutions. This provides greater scope in applications with strict temperature requirements, such as automotive systems and industrial equipment, helping to reduce design load and contribute to further end-product miniaturisation.
Typical shunt resistors are subject to thermal destruction when used under high power: however, when using a 10 mΩ resistor at 3 W, the GMR100 limits the temperature rise to 100 °C. By comparison, a conventional resistor reaches 181 °C.
Rohm Semiconductor; www.rohm.com/eu