Vishay Intertechnology Inc. has extended the resistance range of its E/H MIL-PRF-55342-qualified thin film resistor chips in the compact 2208, 2010, and 2512 case sizes. Allowing for lower resistance values in high-reliability applications, the enhanced devices feature ratings down to 49.9 Ω at ± 25 ppm/°C TCR and a 0.1 % tolerance, and 10 Ω at a 1.0 % tolerance.
Intended for high-reliability military and aerospace applications with stringent performance requirements, the enhanced E/H resistor chips offer stable film and performance characteristics of 200 ppm at + 70 °C for 10,000 hours. Established reliability is assured through 100 % screening and extensive environmental lot testing, through which the devices have been rated for an "R" failure rate level (0.01 % per 1000 hours).
The resistors' all-sputtered wraparound terminations ensure excellent adhesion and dimensional uniformity. Exact dimensions and clean, straight edges are produced by a precise wafer-sawing process. The E/H devices' electroplated nickel barrier layer enables operation at temperatures up to + 150 °C, and their high-purity alumina substrate allows for high power ratings.
In addition to very low noise of less than – 25 dB and a low voltage coefficient of ± 0.5 ppm/V, the noninductive resistors feature an absolute TCR down to ± 25 ppm/°C, laser-trimmed tolerances down to 0.1 %, and typical wraparound resistance of < 0.010 Ω.
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