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Forum: Reliability & Maintainability Questions and Answers

Topic: Reliability & Maintainability Questions and Answers

Topic Posted by: Reliability & Maintainability Forum ( )
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998

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Posted by: Dianne Keating ( )
Date posted: Wed Jul 4 12:25:03 US/Eastern 2001
Subject: Quality Level
I am using RELEX to preform some reliability analysis and I was just wondering if someone could tell me how to determine the quality level for capacitors, resistors and diodes. For example for a ceramic chip capacitor you can select from D, C, S, R, P, M, L. What do these letters stand for? And how do I determine which one to use? Thanks!

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Subject: Quality factors fro Chip Capacitors
Reply Posted by: Art Stone ( )
Organization: L-3 Communications
Date Posted: Thu Sep 12 16:07:46 US/Eastern 2002
In reading the response to this question, I notice that you state, "If you are using a commercial part, use 1.0 factor or non-established reliability 3.0" But the table you enclose, the PiQ Table for Capacitors from MIL-HDBK-217FN2, indicates that for commercial capacitors or capacitors with an unknown level screening level of screening, the PiQ factor should be 10. Which PiQ is appropriate for a capacitor bought to a vendor's part number but where the part number is not tied to an MIL-PRF or MIL-C document (not a QML or QPL part).

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