Good flex circuit drawings should follow the same guidelines as rigid
board drawings - i.e. use IPC specs for the material call-outs -
IPC-4202/4203 and 4204. Do a detailed layer stack. Detail the finish -
i.e. HASL , Gold or Immersion Tin with the appropriate specs and do a
very detailed dimensioned drawing with the 0,0 start position from a
hole centre or artwork feature - not off an edge. Specifications for the
material thickness tolerances are in the above mentioned IPC specs but
most of the vendors easily surpass the tolerances. Regards Steve Kelly

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Roseann Strength
Sent: Wednesday, August 07, 2002 5:08 PM
To: [log in to unmask]
Subject: [TN] flex circuit specs

Can anyone refer me to specifications for fabrication drawings for flex
circuits?
I did not find any board thickness tolerancing for thin flexible
circuits IPC-D-300G (using 1/2 mil construction).
Also, is there a 'standard'  guideline for flex fab drawings?
Thanks

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