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ROHM Semiconductor's High Power Ultra-Low-Ohmic Shunt Resistors

5W class ideal for current detection in automotive and industrial applications

KYOTO, Japan and SANTA CLARA, Calif., April 11, 2014 /PRNewswire/ -- ROHM has recently announced the development of high power ultra-low-ohmic shunt resistors ideal for current detection in applications with increased power requirements, such as automotive systems and industrial equipment. The new PSR series includes PSR400, which is rated at 4W, and PSR500, guaranteed up to 5W.

ROHM's Resistor Selection Chart

Resistors in current detection applications are typically used to detect overcurrent conditions or remaining battery level. And although current sense resistors have been widely adopted in the automotive and industrial sectors, the recent trend towards greater sophistication and computerization has increased current requirements, leading to a need for high power components. This includes a demand for high accuracy resistors with superior temperature coefficient of resistance (TCR) for stable operation in extreme temperature environments and that feature ultra-low resistance values in order to minimize power consumption.

In response, ROHM utilized high quality resistor technology cultivated for the low-power sector to develop a new lineup of high power low-ohmic shunt resistors. In addition, high-yield precision welding technology made it possible to guarantee high rated power in the 5W class, while a high-performance alloy was adopted in the resistive metal for superior TCR in the low-ohmic region. This ensures sufficient margin even in applications with stringent temperature requirements, such as automotive systems and industrial equipment, while lightening design load.

Key Features

1. Exclusive precision welding technology utilized for improved rated power (5W)

To support high power requirements and ensure high measurement accuracy even in the ultra-low-ohmic region (0.2m ohm), 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.

2. 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 for the resistive metal, ensuring superior temperature coefficient of resistance even at ultra-low resistances.


US$2.10 (3000 pcs)




About ROHM Semiconductor:

ROHM Semiconductor is an industry leader in system LSI, discrete components and module products, utilizing the latest in semiconductor technology. ROHM's proprietary production system, which includes some of the most advanced automation technology, is a major factor in keeping it at the forefront of the electronic component manufacturing industry. In addition to its development of electronic components, ROHM has also developed its own production system so that it can focus on specific aspects of customized product development. ROHM employs highly skilled engineers with expertise in all aspects of design, development and production. This allows ROHM the flexibility to take on a wide range of applications and projects and the capability to serve valuable clients in the automotive, telecommunication and computer sectors, as well as consumer OEMs.

For more information, editors should contact:

ROHM Semiconductor
Jayme Pontious, Marketing Communication Manager
Email: [email protected]

ROHM Semiconductor.


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SOURCE ROHM Semiconductor

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