Overview
The
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
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
Generally,
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
Low Ohmic Resistor Development Roadmap
■PSR Series Lineup
| Part No. | Size mm (inch) | Rated Power （W） ※1 | Resistance Tolerance | Resistance Range (mΩ) | emperature Coefficient of Resistance(TCR) (ppm/℃) ※2 | Operating Temp. Range (℃) |
|---|---|---|---|---|---|---|
| NEW PSR400 | 10 × 5.2 (3921) | 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 (5931) | 5 | J (±5%) G (±2%) F (±1%) | 0.2 | ±225 | |
| 0.3, 0.4, 0.5 | ±150 | |||||
| 1.0, 2.0 | ±75 |
Related Information
ROHM will continue to utilize the latest proprietary technologies to
develop products and solutions that meet customer and market needs.
