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ROHM touts ultra-low-ohmic shunt resistors

Posted: 16 Apr 2014     Print Version  Bookmark and Share

Keywords:ROHM Semiconductor  shunt resistor  automotive  industrial equipment 

ROHM has developed what it says are high power ultra-low-ohmic shunt resistors geared for current detection in applications with increased power requirements such as automotive systems and industrial equipment. The PSR series includes PSR400, rated at 4W, and PSR500, guaranteed up to 5W.

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 computerisation 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 minimise power consumption.

ROHM's Resistor Selection Chart

ROHM's Resistor Selection Chart. (PRNewsFoto/ROHM Semiconductor)

In response, ROHM utilised high quality resistor technology cultivated for the low-power sector to develop a 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.

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.

Generally, as resistance value decreases the temperature coefficient of resistance increases. In response, ROHM used a high-performance alloy for the resistive metal, ensuring superior temperature coefficient of resistance even at ultra-low resistances.

The devices are available for $2.10 (3000 pcs). Samples are available.

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