Hello Technet
A question for bare board gurus.   Is there a difference in reliability between high Tg and regular Tg FR-4 ( IPC-4101/24 vs IPC-4101/21) in a vehicle type application?
The end use application is less than Tg of /21 material, so not in the glass transition range for either material.

Typically - is the CTE different between these two?  (I expect that depends on the manufacturer to some degree).  If there isn't a high temperature operating requirement, why select the high temp FR-4?

Thanks!



regards

Graham Collins
Process Engineer, 
Northrop Grumman
Atlantic Facility of Litton Systems Canada
(902) 873-2000 ext 6215

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