ROHM Power Type Metal Resistors: PSR400/500 Series

Ideal for large-current applications High Power Shunt Resistors (Metal Strip Type)

Overview | Feature 1 | Feature 2Application Circuit Examples  | Low Ohmic Resistor Development Roadmap


PSR400/500The increasing computerization in the automotive and industrial markets, along with the rapidly expanding current control application sector and the trend towards high current circuit designs have increased demand for products with higher rated power.
The PSR Series is offered in the ultra-low resistance range from 0.2mΩ to 3mΩ and provides high rated power (4W, 5W), making it ideal for current detection in large-current applications.

Key Feature 1: High Rated Power

High Rated Power To support high power requirements and ensure high measurement accuracy even in the ultra-low-ohmic region (0.2mΩ), technology for bonding copper electrodes without variations is required. ROHM employed original precision welding technology to join the resistive metal to thick copper electrodes, achieving high heat capacity with excellent thermal dissipation characteristics. This increases power-handling capability (5W class) while improving productivity.

Features2:Superior temperature coefficient of resistance, even in the ultra-low-ohmic region

Superior temperature coefficient of resistance, even in the ultra-low-ohmic regionGenerally, as resistance value decreases the temperature coefficient of resistance increases. In response, ROHM utilized a high-performance alloy material for the resistive metal, ensuring superior temperature coefficient of resistance even at ultra-low resistances.

Application Circuit Examples

Application Circuit Examples

Low Ohmic Resistor Development Roadmap

Product Family

■PSR Series Lineup

Part No. Size
mm (inch)
Rated Power
(W) ※1
Resistance Tolerance Resistance Range
emperature Coefficient of Resistance(TCR)
(ppm/℃) ※2
Operating Temp. Range
NEW  PSR400 10 × 5.2
4 J (±5%)
G (±2%)
F (±1%)
0.3, 0.5 ±175 -55 to +170
1.0, 2.0, 3.0 ±75
NEW  PSR500 15 × 7.75
5 J (±5%)
G (±2%)
F (±1%)
0.2 ±225
0.3, 0.4, 0.5 ±150
1.0, 2.0 ±75
※1 at +70℃※2 +20℃~+125℃

Related Information

High Power Ultra-Low-Ohmic Shunt Resistors

ROHM will continue to utilize the latest proprietary technologies to develop products and solutions that meet customer and market needs.

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