Non-Magnetic Thin-Film Resistors to 6W

Vishay Intertechnology, Inc. today introduced a new series of high-power, surface-mount, precision non-magnetic thin-film chip resistors. Built on aluminum-nitride substrates, the Vishay Dale Thin Film PCNM series offers power ratings of 2W and 6W in compact 1206 and 2512 case sizes, respectively.

The aluminum nitride substrates of the resistors released today feature enlarged backside terminations to reduce the thermal resistance between the topside resistor layer and the solder joint on the end user's circuit assembly. As a result, the devices provide four times the power-handling capability of previous-generation non-magnetic resistors.

These high power ratings make the devices suited for use in power supplies for telecommunications, medical, and military equipment and instrumentation. The resistors’ non-magnetic properties eliminate the effects of stray magnetic fields on circuit performance in X-ray and MRI machines while correcting passive intermodulation issues in cell phone base stations and amplifiers.

PCNM series devices combine their high power ratings with a low TCR down to ±25 ppm/°C and laser-trimmed tolerances to ±0.1% over a wide temperature range of -55 to +155 degrees C. The resistors are offered with a wide range of resistance values from 2Ω to 30.1kΩ, and they offer low noise of less than -30dB, low voltage coefficients of less than 0.1 ppm/V, and voltage ratings from 75V to 200V.

Flame-resistant in accordance with UL 94 V-0, the devices are available with lead (Pb)-bearing and lead (Pb)-free, RoHS-compliant terminations.

Samples and production quantities of the PCNM series are available now, with lead times of eight to 10 weeks for large orders. Pricing for U.S. delivery starts at $0.60 per piece in 1,000-piece quantities and varies by case size and tolerance.