SRC Forum - Message Replies
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
Posted by: Ken Meyerhoffer
Date posted: Wed Jan 10 9:31:30 US/Eastern 2001
Subject: Chip Ferrite Bead Reliability
How have you dealt with SMT chip ferrite beads when performing reliability predictions in M217, Bellcore and PRISM?
Subject: Reliability Chip Ferrite Bead
Reply Posted by: Bruce Dudley
Organization: Reliability Analysis Center
Date Posted: Thu Jan 11 13:43:40 US/Eastern 2001
Failure rate models for ferrite bead components are not available in Mil-Hdbk-217, Bellcore or Prism. Prism has failure information which can be used from the generic data base attached to the program. This generic failure data indicates a failure rate of 12 or 13 FITS (failures per billion hours)for benign conditions. So one could use this value which was collected at ground benign or controlled conditions and extrapolate it to the expected use conditions. The Reliability Toolkit; Commercial Practices Edition has conversion factors for estimating the environment change impact.