Vishay's MIL-PRF-55342-Qualified Thin Film SMD Resistor Chips Now Offer 'T' Reliability Level for Space Applications

The enhanced resistors' established reliability is assured through 100 % screening and extensive environmental testing that includes 100 % group A, power conditioning, and Group B lot testing, through which the devices have been rated and approved for a T reliability level.

The Mil-PRF-55342 Thin Film resistors were verified in qualification for 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. In addition, the resistors undergo a burn-in period prior to shipment.

Intended for high-reliability military and aerospace applications with stringent performance requirements, the resistors' all-sputtered wraparound terminations ensure excellent adhesion and dimensional uniformity. The Mil-PRF-55342 Thin Film devices feature a passivated Nichrome resistive element, while their high-purity alumina substrate allows for high power ratings to 500 mW.

In addition to very low noise of less than – 25 dB and a low voltage coefficient of < 0.1 ppm/V, the resistors offer an absolute TCR down to ± 25 ppm/°C, tolerances down to 0.1 %, and a resistance range from 10 Ω to 1.69 MΩ depending on case size and characteristics. The Mil-PRF-55342 Thin Film devices provide a shelf-life stability of ± 0.01 % and operate over a temperature range of - 55 °C to + 125 °C.