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

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SMT electronics assembly manufacturing forum.


PCB finish for compression mount connectors (LGA's)

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#46280

PCB finish for compression mount connectors (LGA's) | 19 December, 2006

Does anyone have any reliability history on using compression mount connectors, such as LGA sockets (no soldering of contacts as contact exerts spring pressure on PCB pad) to PCB�s with immersion Au or ENIG finished pads?

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#46288

PCB finish for compression mount connectors (LGA's) | 19 December, 2006

We'd suggest using your connector supplier recommendations. Some use: * Pad Plating: 20-30 uin Au over 50 uin Ni (You might get away with less gold) * In-Pad Vias: less than half the diameter of the button (for contact-only configurations) * PCB/Chip flatness per side: 0.003 in * Pad true position: Typically 0.010 in

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