Accession Number : AD0874531

Title :   5-Kilowatt, 1-Kilovolt, Laminated Sonar Transistor.

Descriptive Note : Interim engineering rept. no. 5, 1 Jan-31 Mar 70,

Corporate Author : RCA SOLID STATE DIV SOMERVILLE NJ

Personal Author(s) : Becke, Hans W. ; White, Joseph P.

Report Date : JUL 1970

Pagination or Media Count : 30

Abstract : Developmental work on the mechanical aspects of the laminated overlay process was completed. Preferential emitter etching was incorporated into the process with emitter site size reduced to 2.5 mils on 5.5-mil centers. A process flow chart and a brief description of the process are presented. Preliminary measurements on laminated etched wafers showed good emitter-junction and collector-junction characteristics; however, beta was very low. It appears that the beta problem is associated with the seeding and epitaxial refill operations and is not inherent in the etched wafers. The feasibility of parallel packaging was demonstrated after minor changes were made in the design of the base connector. Thermal-stress measurements indicate severe thermal fatigue of solder-mounted pellets. It is expected that the use of an alloy having a higher lead content will improve this condition substantially. (Author)

Descriptors :   (*TRANSISTORS, SONAR EQUIPMENT), MANUFACTURING, LAMINATES, PRODUCTION CONTROL.

Subject Categories : Electrical and Electronic Equipment
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE