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

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Wave Soldering With BGA's

Chris McDonald

#9720

Wave Soldering With BGA's | 8 September, 1999

Has anybody have any experience with Top placement of BGA's. GLue descretes on bottom and then wavesolder.?

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Duane Nguyen

#9721

Re: Wave Soldering With BGA's | 8 September, 1999

| Has anybody have any experience with Top placement of BGA's. GLue descretes on bottom and then wavesolder.? | | | Hi Chris, Why don't you process a double side reflow and use selective wave fixture for wave process. The process will be easier and high yield.

Duane

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Earl Moon

#9722

Re: Wave Soldering With BGA's | 8 September, 1999

| | Has anybody have any experience with Top placement of BGA's. GLue descretes on bottom and then wavesolder.? | | | | | | | Hi Chris, | Why don't you process a double side reflow and use selective wave fixture for wave process. The process will be easier and high yield. | | Duane | Duane has one answer. Also consider applying "goop" as a selective, water soluble solder mask.

Earl Moon

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Glenn Robertson

#9723

Re: Wave Soldering With BGA's | 9 September, 1999

| Has anybody have any experience with Top placement of BGA's. GLue descretes on bottom and then wavesolder.? | | | Chris -

This is a common practice. Just remember that BGA solder joints are especially susceptible to secondary reflow damage. I suggest you take ALL the usual precautions to avoid it if you wave solder boards with BGAs. If you have access, there were good papers on the topic in the proceedings for Nepcon in 1994 and SMI in 1995.

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Chris McDonald

#9724

Re: Wave Soldering With BGA's | 14 September, 1999

| | | Has anybody have any experience with Top placement of BGA's. GLue descretes on bottom and then wavesolder.? | | | | | | | | | | | Hi Chris, | | Why don't you process a double side reflow and use selective wave fixture for wave process. The process will be easier and high yield. | | | | Duane | | | Duane has one answer. Also consider applying "goop" as a selective, water soluble solder mask. | | Earl Moon |

Earl, apply the mask to where?? TO hold the BGA in place? THis is a NO clean process so i would use PC Flex Mask or simular.

My problem is that I have 3 100 pin through hole connectors to solder. And to selective solder I have descretes very close to the through hold connectors. ( I know a bad design but we are contract manufactures and we have to live with it!)

Thanks

Chris

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