Accession Number : AD0487203

Title :   FAULT ISOLATION IN ELECTRONIC DEVICES. VOLUME II - SURFACE TEMPERATURE GRADIENTS OF OPERATING INTEGRATED CIRCUITS.

Descriptive Note : Final technical documentary rept. Mar 65-Jun 66,

Corporate Author : SYSTEMS RESEARCH LABS INC DAYTON OH

Personal Author(s) : Ballard, James W. ; Horn, Eugene F. ; Steinmetz, Eugene P.

Report Date : JUN 1966

Pagination or Media Count : 40

Abstract : The research into fault isolation techniques constituted two parallel efforts, the reports are identified as Volumes I and II of this report. In the work cited herein, thermal and electzical characteristics of integrated circuits (IC's) were studied so that the status of the circuit operating conditions could be determined. Because of its stability, a precision portable potentiometer was employed with 3 mil thermocouple wire to measure temperatures. The work indicated the temperature must be measured to better than 0.1C. The limit of temperature measurements was .01C. Both 'can' and 'flat' type IC's were purchased for the tests from three companies. A total of 15 circuits were studies. The range of temperature of IC's with only power applied was from 0.73C to 11.60C above the ambient temperature. After the signal was applied, the temperature change due to the signal ranged from -0.35C to 0.42C. In one case a purchased malfunctioning IC was easily detected, i.e., the difference between 0.79C normal operation and 6.27C malfunction operation. Temperature gradients were found across only a few 'flat' and 'can' type IC's. All temperatures were therefore measured at the center of the surface of thh IC's. Heating and cooling curves were found for some IC's under selected electrical conditions. Thermistors and circuits were briefly investigated indicating further development would be required to obtain a satisfactory temperature measuring device. (Author)

Descriptors :   (*INTEGRATED CIRCUITS, THERMAL PROPERTIES), (*SURFACE TEMPERATURE, INTEGRATED CIRCUITS), RELIABILITY(ELECTRONICS), FAILURE(ELECTRONICS), POTENTIOMETERS, THERMOCOUPLES, THERMISTORS, MEASUREMENT, VIDEO AMPLIFIERS, MAINTENANCE.

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE