The current specification for this material would be - IPC-4101 L21 0200
C1/C1 AB - bow and twist is no longer a problem for laminate
manufacturers.


Jeffrey Bush
Director, Quality Assurance and Technical Support

VERMONT CIRCUITS INCORPORATED
  76 Technology Drive - POB 1890
    Brattleboro, Vermont 05302
      Voice: 802.257.4571.21 Fax: 802.257.0011
           http://www.vtcircuits.com
 

-----Original Message-----
From: John Parsons [mailto:[log in to unmask]] 
Sent: Friday, April 01, 2005 2:12 PM
To: [log in to unmask]
Subject: [TN] MIL-S-13949 Cross Reference

I have a customer spec'ing the following  FL-GF020C1/1BIIA



OK, so I know(?) that this is a MIL-S-13949 spec.  I don't have an old
copy
so have done the requisite "Google" and Technet Archive search in an
attempt
to understand this so I can cross it to IPC-4101.  I could use some
help.



1.      FL = Flexible laminate correct?  TL = thin laminate??  What is
the
difference in construction for a given dielectric thickness (020)?
2.      "B" after C1/1 still refers to thickness tolerance?  Does it
equate
to "B" in 4101?
3.      What is "IIA" after the "B"?
4.      Anyone want to provide the exact 4101 equivalent callout for the
above spec?



Happy Friday!

John Parsons




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