New MIL-PRF-55110 Revision H on Rigid PWB’s

MIL-PRF-55110, “Printed Wiring Board, Rigid, General Specification for,” has just been revised.  The new Revision H is the first update since Revision G was released with Amendments 1 through 3 back in 2008.  While the specification is inactive (you’ll use MIL-PRF-31032 for new design), it is still widely used for replacement purposes.  If you use the document, you’ll want to get your new edition now.  Compliance with the new Revision H must be completed by April 17, 2015.

The document was originally released as MIL-P-55110, “Printed Wiring Board, General Specification For.”  As part of Mil Spec reform back in the 1990’s, the document was re-classified as a performance specification and given the new number MIL-PRF-55110 to reflect the change.  About 6 months after the transition, the document was inactivated.  However, it continues to be maintained and widely used.

It’s been 6 years since the last update, so changes are extensive (no notations in the margins to help you spot revised material in this new publication).  You’ll expect that as with previous updates, your documentation and processes will be affected.  Having said that, the new Revision H is significantly longer than the previous Revision G.  Why all the new material?  The addition of a number of new Appendices.  Let’s review them:

  • Appendix A – Now Product Assurance Requirements for Qualified Products List Level
  • Appendix B – Now Product Assurance Requirements For Qualified Manufacturer List Programs
  • Appendix C – Still C = 0 Sampling, Test Equipment, And Inspection Facilities
  • Appendix D – Still Supersession, Conformance Inspection Options, And Use Of Legacy Design Standards
  • Appendix E – Now Qualification Requirements For All Levels Of Product Assurance
  • Appendix F – New External Visual And Dimensional Illustrations
  • Appendix G – New Metalographic Illustrations
  • Appendix H – New Quality Conformance Test Circuitry

You’ll notice that the old Appendix E on Sequential Electrochemical Reduction Analysis (SERA) solderability testing is not included in this new edition.

If you use MIL-PRF-55110 in your business, you’ll want to get a copy of the new Revision H.  It’s available to order on the Document Center website, www.document-center.com.  Or you can contact our staff by phone (650-591-7600), fax (650-591-7617) or email (info@document-center.com).  We’ve been supporting the electronics and defense industries since our inception in 1982.  Make us your Standards Experts!

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Claudia Bach

Claudia Bach is the President of Document Center Inc. and a world-wide recognized expert on Standards and Standards Distribution. You can connect with her on Google+

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