Current sense resistors

15 September 2010 Passive Components

For power electronics design engineers looking for high-current devices capable of providing current-sense and surge protection functions in high-temperature environments, IRC offers a series of open-air current sense resistors. The OARS-3 series surface mount metal alloy strip resistors feature a flameproof open-air design that elevates the device’s ‘hot spot’ above the PC board, where heat can be dissipated to ambient air instead of to adjacent, thermally sensitive components.

The OARS-3 series performs at 3 W; however, testing conducted by IRC engineers demonstrate that the resistor is capable of handling higher power levels without forced air depending on system thermal design. Testing at 4 W reveals that, although the 'hot spot' temperature can reach in excess of 230°C when the resistor is running at full power, the solder joint remains at 110°C or below.

The resistors are nominally rated for 3 W at 70°C, with a resistance range from 2 mΩ to 15 mΩ and tolerances to ±1%. Inductance values are less than 10 nH, with operating temperature ranging from -40°C to +125°C. RoHS-compliant and zero Ω jumper versions are also available. IRC will also produce devices outside these specifications to meet customer requirements.

For more information contact www.irctt.com

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