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Chip resistors offer high power in small package

Posted: 11 Sep 2007 ?? ?Print Version ?Bookmark and Share

Keywords:chip resistors? small package? high-power?

TT electronics IRC Advanced Film Division is offering 3W surface-mount chip resistors. Designated the LRF3W series, the chip resistors are offered in a package size traditionally rated at 1W.

"The surface mount resistors, in a 1225 package, have terminations on the long end of the devices, creating a low inductance part and resulting in less stress on the solder joints," said Gary Bleasdell, thick film business unit director for IRC's Advanced Film Division. "The thermal properties of the chip are also much better than traditional designs, allowing it to be rated to 3W as opposed to 1W."

Because of its high power rating in the space-saving package, the LRF3W series resistor is suitable for high current-sensing applications including fuel-gauging and over-current detection, AC/DC power supplies and VRMs, motorized seats, power windows, seat heaters and automotive fuel pump collision cut-off.

The LRF3W series chip resistor features a resistance range from 0.002 to 0.100, with absolute tolerances of 1 percent, 2 percent, 5 percent and 10 percent. Power dissipation is up to 3W at 70C, with TCR as low as 100ppm/C.

Operating temperature ranges from -55C to 150C. The chip resistors feature leach-resistant wrap-around terminations with either tin/lead or Pb-free matte tin over nickel plating. IRC will also produce devices outside these specifications to meet customer requirements.

Pricing for the LRF3W series chip resistor is 20 cents at 1,800-piece MOQ.

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