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SMD resistor targets military, aerospace apps

Posted: 20 Mar 2013     Print Version  Bookmark and Share

Keywords:Vishay Intertechnology  SMD resistor  E/H series  ASTM E-595  MIL-PRF-55342 

Vishay Intertechnology Inc. has expanded its E/H series of MIL-PRF-55342-qualified thin film surface-mount resistors with the release of a chip boasting an "S" level failure rate of 0.001 per cent per 1,000hrs in 12 case sizes. The QPL devices are qualified to TCR characteristics E, H, K, L and M.

Additionally, the company said the enhanced resistors' established reliability is assured through 100 per cent screening and extensive environmental testing that includes 100 per cent group A, power conditioning, and Group B lot testing, through which the devices have been rated and approved for an "S" failure rate level.

The Vishay Dale Thin Film MIL-PRF-55342 resistors were verified in qualification to the American Society for Testing and Materials (ASTM E-595) standard test method for total mass loss (TML) and collected volatile condensable materials (CVCM) from outgassing in a vacuum environment for space level requirements.

Intended for high-reliability military and aerospace applications with stringent performance requirements, the E/H series' all-sputtered wraparound terminations ensure excellent adhesion and dimensional uniformity. The MIL-PRF-55342 thin film devices feature an electroplated nickel barrier layer for operating conditions to 150°C, a TAMELOX resistive element and a high-purity alumina substrate for high power ratings to 1000mW.

In addition to very low noise of less than -25dB and a low voltage coefficient of less than 0.1ppm/V, the resistors offer an absolute TCR down to 25ppm/°C, laser-trimmed tolerances down to 0.1 per cent, and a resistance range from 10Ω to 6.19MΩ, depending on case size and TCR characteristics. The MIL-PRF-55342 thin film devices provide a shelf-life stability of 0.01 per cent and are offered in antistatic waffle pack or tape-and-reel packaging.

Samples and production quantities of the "S" level devices are available with standard lead times of stock to 10 weeks.

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