PRODUCTION ENGINEERING MEASURE FOR THE IMPROVEMENT OF GERMANIUM ALLOY POWER TRANSISTORS.
Quarterly progress rept. no. 5, 30 Apr-31 July 63,
CLEVITE TRANSISTOR PRODUCTS WALTHAM MASS
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Further work on the cleaning procedure involving etching variants and changes in the drying technique is discussed. Three methods of reducing the internal relative humidity of the transistor package are outlined. Evaluation of the redesigned internal clip is discussed, as well as evidence of failure mechanism failure modes and corrective action to be taken. Redesign of the collector pellet resulting in a solution to the high collector current leakage problem is described. Test results of units assembled with component piece parts stored in various ways prior to assembly, and the newly installed production method of material handling of transistor sub-assemblies through the fusing and first electrical testing operations are described. The effectiveness of the improved vendor and internal production process control techniques is discussed. A display of process average information relating to weld and terminal leak control is provided for evaluation. Correlation of failure rates at various temperature stress levels is discussed. Author