Technet RE: BeCu Flex

Dave,  I believe you are requesting information
on berylium copper (BeCu),  which is used in flex
circuit applications requiring a well-retained
form or "set".  In such applications,  the flex
is tooled to be formed once and does not
significantly "relax" like the more ductile
rolled annealed copper.

Half-hard BeCu is well suited to applications
such as flex "cross-overs" and bar soldered
header connectors with flex.

Due to its increased electrical resistance,  BeCu
has only about 20% of the  current carrying
capacity of rolled annealed copper and must be
derated from standard copper.

Bob Sheldon


>>> David Tyler <[log in to unmask]>
01/19/98 11:19am >>>
Hi Technetters
Does anyone out there have any information on
BuCu for flex circuits.  I'm
interested in processing issues both for the
circuit manufacturer and the board
fabricator.  Also of interest are the properties
of this material and the
reasons one would choose it.  Any information at
all will be greatly
appreciated.

Thanks in advance,

Dave Tyler

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