Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


PCB Au thickness

iman

#25981

PCB Au thickness | 7 October, 2003

Hi Experts,

Pls help advise what is the expected range of PCB gold thickness over Ni (for ENIG/Electrolytic fabrication processes)? any referrence standards set by the IPC?

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#25983

PCB Au thickness | 7 October, 2003

J-STD-001C requires removal of gold from (through-hole) component leads when the thickness of the gold layer is above 2.5 microns to prevent problems with embrittlement. The thickness of gold on an ENIG board typically is around 0.05 micron, resulting in a gold content in the joints far below what's considered dangerous. Often, three percent gold in a solder connection is discussed a the limit.

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