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: Kevin Silke
Date posted: Mon Apr 7 17:43:30 US/Eastern 2003
Subject: MLCC Derating
In a power supply we are designing, there is a multilayer ceramic chip capacitor that can see a significant ripple current. Our normal derating criteria in this case is to calculate the temperature rise of the part, ensure that we still have 10C of margin against the rated max temperature in the worst case environment, and add some additional voltage derating if the part temperature gets within 40C of the max rated temperature. But this allows for a significant temperature rise in the part. Is there a limit on the allowable temperature rise that I should be using?