Fluid Abrasive Trimming of Thin-Film Resistors

descriptionPublicationkeyboard_double_arrow_right Article 01 Jun 1976 English Publisher:Institute of Electrical and Electronics Engineers (IEEE)Journal:IEEE Transactions on Parts, Hybrids, and Packaging, volume 12, pages 133-138 (issn: 0361-1000,

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Authors: T. Faith; J. Jennings;

doi: 10.1109/tphp.1976.1135116

Fluid Abrasive Trimming of Thin-Film Resistors

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Abstract

Thin-film nickel-chromium resistors have been trimmed using the fluid jet from an air brush. Micrometersized distilled water droplets impinge on the resistor surface at high velocity, eroding away resistor material, thereby increasing resistance. The need for top hats is eliminated. Substrate damage and the hot spots which result from trim-line cuts are avoided. Trimming up to 230 percent has been achieved on narrow (0.0012-in) resistors. Test results at power densities up to 6000 W/in2indicate that power density ratings as high as 2400 W/in2are feasible.

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