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

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


BGA Rework

Igmar Grewar

#15525

BGA Rework | 8 June, 1998

Our company wants to buy a rework station for BGA's. I would like to know what is a good BGA rework station. IR or hot air? Do we need a rework station with optical placement or can BGa's be placed manually during rework. We have seen a demo of an ERSA IR rework station. Other than that we have seen Weller and OK Industries only in catalogs. Thanks for any info.

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Debbie Nizri

#15528

Re: BGA Rework | 9 June, 1998

| Our company wants to buy a rework station for BGA's. I would like to know what is a good BGA rework station. IR or hot air? Do we need a rework station with optical placement or can BGa's be placed manually during rework. We have seen a demo of an ERSA IR rework station. Other than that we have seen Weller and OK Industries only in catalogs. Thanks for any info.

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Justin Medernach

#15527

Re: BGA Rework | 10 June, 1998

| Our company wants to buy a rework station for BGA's. I would like to know what is a good BGA rework station. IR or hot air? Do we need a rework station with optical placement or can BGa's be placed manually during rework. We have seen a demo of an ERSA IR rework station. Other than that we have seen Weller and OK Industries only in catalogs. Thanks for any info. Igmar, Focus on the bottom side pre heater. this will make or break the process. If you're an OEM and you do small boards of "normal" thickness, don't worry about it. If you're a contractor and you see all kinds of assemblies of varying dimensions, you will need a beefy bottom side preheater. SRT, AIRVAC, and Conceptronics are the closest. My money is on the Conceptronic station. Only drawback is it has an IR preheater. Welcome back to the stone age. The problem with convection on these things is nobody designs it properly (I think, sorry guys). I'm just a young guy and I don't have very much experience but I remember something from college about air flow and some funky 7:1 ratio. The air source has to supply enough volume such that its' output pressure is 7 times greater than the exhaust port's (holes in the plenum). Also, the plenum has to be a certain height in order to get the appropriate convection. Bottom line, their designs do the job but they are by no means theoretically correct and the functionality suffers. Think it through and ask other users. Regards, Justin Medernach

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Bob Willis

#15526

Re: BGA Rework | 16 June, 1998

I must say that I feel when the board has been correclty designed with corner marks on the edge of the BGA the optical systems are not necessary on 0.50/0.060" pitch. I like both air and IR the IR has the major benifit that you do not need all the extra heads. There is a procedure for BGA Rework on my web site to download if you like. | Our company wants to buy a rework station for BGA's. I would like to know what is a good BGA rework station. IR or hot air? Do we need a rework station with optical placement or can BGa's be placed manually during rework. We have seen a demo of an ERSA IR rework station. Other than that we have seen Weller and OK Industries only in catalogs. Thanks for any info.

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