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

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Reflowing BGA balls directly to a PCB surface

#33276

Reflowing BGA balls directly to a PCB surface | 18 March, 2005

Here's a good one!!! I've got a customer who is designing a small circuit board, and they want to reflow BGA solder balls directly to the bottomside of the PCB to effectively create a BGA style interface between his PCB and another PCB. Anybody ever done this before? I think it sounds exciting, but never having done much reballing, I have some serious concerns. What kinds of questions should I be asking my customer?

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RDR

#33277

Reflowing BGA balls directly to a PCB surface | 18 March, 2005

Are we talking about reflowing the two boards together after the one gets the solderballs reflowed onto it?

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#33403

Reflowing BGA balls directly to a PCB surface | 26 March, 2005

Consider this: * SolderQuick Winslow Automation-type [ http://www.winslowautomation.com ] preform * When LGA first came on the scene, we didn't have a clue. After trying sockets, we printed paste on the pads bug-up, reflowed, and then the placed the parts.

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#33462

Reflowing BGA balls directly to a PCB surface | 30 March, 2005

We've already done it for a customer.

We used 63/37 ssd's on the top side where the are a few caps and one 256 pin QFP, coated with adhesive flux to hold the component, and lead free un flattened ssd's on the bottom to be attached to the other board after the QFP went on. I have photo's!!

Let me know if you would like to see them.

Matt Kehoe SIPAD Systems inc.

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#33468

Reflowing BGA balls directly to a PCB surface | 31 March, 2005

Yes! I would like to see the pics. I've already been looking into the SolderQuick system that Dave has recommended, but my customer wants some with 63/37 balls and some SAC305. SolderQuick doesn't have any SAC305 alternatives available as of yet. Thaks for your help!

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#33494

Reflowing BGA balls directly to a PCB surface | 1 April, 2005

A company called BEST makes a thing called Stencil Quik. It's like a stencil that sticks onto your board, you squeegee paste, place component/board and reflow. The Stencil Quik remains on the board. It prevents shorts and in your case could provide support. Take a look: http://www.solder.net/stencilquik.asp

And no I don't work or rep them, but great people to work with.

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