Forum: Reliability & Maintainability Questions and Answers
Topic: Reliability & Maintainability Questions and AnswersTopic Posted by: Reliability & Maintainability Forum (firstname.lastname@example.org )
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998
Original Message:Posted by: Shanta
Date posted: Thu Jun 5 16:12:04 US/Eastern 2003
Subject: Default temperature rise for diodes in PRISM model
In the PRISM model, the default temperature rise for diodes is 60C. If the system is operating at 40C (average room temperature), the diodes in the system operate at 100C (40+60). Why is the default temperature rise so high? Seems hard to believe that standard, off the shelf diodes, can operate/withstand 100C temperatures. Since the overall system temperature is 40C, won't the diodes operate at a temperature slightly higher than that? Is the temperature rise only due to internal heating (thermal resistance*power)?