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What to look for in a BGA Lab analysis

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#73645

What to look for in a BGA Lab analysis | 4 March, 2015

Hola,

I'm about to evaluate our BGA capabilities by using a dummy PCB+Components kit, I'll be evaluating solder paste, pick n place, reflow process & rework method. I have an idea of how to validate these processes. I'm planning to send different samples to a lab analysis, my question is what should I ask the lab to look for? a) Voids level? b) Inter-metallic layer? c) ball shape?

what would be a typical requirement for lab analysis?

Saludos!

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#73647

What to look for in a BGA Lab analysis | 4 March, 2015

A full blown analysis could become very expensive. There are many test that can be performed.

3D acoustic microscopy, X-ray, Dye and pry,and I'm sure the list goes on.

Typically, a micro-cross section report of the BGA solder joints will show you what you need. They look at ball shape, voids, and measure the inter-metallic which is a subjective number.

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#73742

What to look for in a BGA Lab analysis | 26 March, 2015

Right. That's what we normally do for our customers in order to just qualify a process. I'd just add X-ray, particularly on a large BGAs.

Regards,

Vlad SENTEC TESTING Laboratory Inc.

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#73743

What to look for in a BGA Lab analysis | 27 March, 2015

If you want a step by step guide on BGA look at my NPL/IPC "Defect of the Month" video clips

https://www.youtube.com/watch?v=MC4K0eSXH18

For other process issues there are also videos which may assist on other process issues like voids, solder balls, solder beads, contamination, delamination all of the common process problems see https://www.youtube.com/user/MrBobwillis

Bob Willis

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#73744

What to look for in a BGA Lab analysis | 27 March, 2015

A good resource for implementing/evaluating a BGA process is IPC-7095C - "Design and Assembly Process Implementation for BGAs".

I get no monetary or other compensation for promoting that standard but it is fun to mention that a board assembled by my company is on the front and back covers of the standard. :-)

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