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Resistors provide surge protection in high-temp setups

Posted: 02 Mar 2010 ?? ?Print Version ?Bookmark and Share

Keywords:resistor? surge protection? current sensing?

OARS-3 resistor

TT electronics IRC is offering an open-air current sense resistor series that is designed for power electronics design engineers looking for high-current devices capable of providing current-sense and surge protection functions in high temperature environments.

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.

Applications include computer power supplies, high-reliability server equipment, and automotive underhood applications.

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

The OARS-3 series resistors are nominally rated for 3W @70C, with a resistance range from 2m? to 15m? and tolerances to 1 percent. Inductance values are less than 10nanohenries, with operating temperature ranging from -40C to +125C. RoHS-compliant and 0? jumper versions are also available. IRC will also produce devices outside these specifications to meet customer requirements.

Pricing for the OARS-3 series is approximately $0.86 each in minimum order quantities of 1900 pieces. Lead time is from stock to 14 weeks.

- Ismini Scouras

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