Compact precision non-magnetic chip resistors offer power ratings to 6W

A new series of high-power surface-mount precision non-magnetic thin-film chip resistors has been introduced Vishay. Built on aluminium nitride substrates, the PCNM series offers power ratings of 2W and 6W in compact 1206 and 2512 case sizes, respectively. The aluminium 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. The high power ratings make the devices ideal for use in power supplies for telecommunications, medical, defence 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 -55C to +155C. The resistors are offered with a wide range of resistance values from 2ohm to 30.1kohm, and they offer low noise of <-30dB, low voltage coefficients of < 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.