Bill,
IPC-4101/21,/24,/26 should work fine. This gives you a Tg range to work
within depending on your layer count and end-use environment.
Dewey

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Brooks,Bill
Sent: Friday, March 18, 2005 6:59 PM
To: [log in to unmask]
Subject: [TN] Most common version of FR4?


I'm looking for a reading on the most common version of FR4 material for 2
sided boards and for multilayer boards... based upon usage in the board
manufacturers shops...

I want to specify per IPC-4101/??

The best choices would have better Tg characteristics... so I was leaning
toward IPC-4101/26 as my choice but there may be a suitable alternative that
is more commonly used that someone can point me to.

I have some old board designs that were originally build back when
MIL-P-13949 was the spec and GFN FR4 was all we had to specify...

It's time to update the notes...
Any help appreciated... :)

Best regards,

Bill Brooks - KG6VVP
PCB Design Engineer , C.I.D.+, C.I.I.
Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510
e-mail:[log in to unmask]
http://www.dtwc.com
http://pcbwizards.com

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