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

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Screen Printing for BGA

John Luckham

#7699

Screen Printing for BGA | 26 January, 2000

Having only just started to deal with BGA packages, I was wondering if anyone could advise me on possible aperture reductions when screen-printing boards for BGA placement

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Franck Bourrieres

#7700

Re: Screen Printing for BGA | 26 January, 2000

No reduction are required, the screen should have appertures of the same size than the pad.

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#7701

Re: Screen Printing for BGA | 26 January, 2000

We don�t distinguish between BGA, finepitch or other parts; they all get the same aperture reduction of 15% which is determined by the finepitch process. We use only PBGAs with eutectic balls.

Wolfgang

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Joe

#7702

Re: Screen Printing for BGA | 31 January, 2000

No reductions required, keep them at 100%.

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David Brown

#7703

Re: Screen Printing for BGA | 2 February, 2000

I have used a 15 to 20 % reduction on PBGAs to reduce the possibility of shorting. On CBGAs and CCGAs I use a One to One aperture.

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