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  • Author Author: wolfgangfriedrich
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Breakout board for a BGA chip

printf(F("Hello World!));

 

I am planning a breakout board for an BGA chip and have so many decisions, that I would like to get some input from the community.

 

The BGA is a 5mm x 5mm 24-ball BGA (pin A1 is missing). The device is the VLSI VS23S040 Composite Video/RGB/VGA + Memory controller.

To make the part usable I would add the crystal and bypass capacitor to the breakout board.

 

Some options that make sense to me are:

  • 2.54mm (0.1") pitch, pins on 4 sides: 18mm x 18mm size, easy to handle and solder, not so easy to test. Not testable with horizontal pogo pins.
  • 2.54mm (0.1") pitch, pins only on 2 opposite sides: 32mm x 10mm size, to be usable on a prototype board, the pins could only be on 2 sides. This would make the board unnecessary big, but more versatile.
  • 2mm (80mil) pitch, pins on 4 sides: 14mm x 14mm size, would give the smallest area footprint and be still easy to solder. Not testable with horizontal pogo pins.
  • 1.27mm (50mil) pitch, pins on 4 sides: 9mm x 9mm size, BGA only without crystal. Smallest size ever.
  • 1.27mm pitch, pins on 2 sides: 16mm x 8mm size, very small with crystal and testable with pogo pins.

 

Ideas for any other configurations. Please tell me in the comments

 

Thanks for having an opinion.

 

- W.

 

PS: I was hoping the image are comparable scale, but they are not.

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  • The "best" option really depends on how you intend to use it. It's not something a poll can help you decide - unless we're your target sales market. For instance, how does being testable with horizontal logo pins help? Will you be making and testing a lot of these?

  • in reply to Fred27

    Good points.

    The idea is to make an interesting chip (at least I think it is) more accessible for a range of people who tent to build their own systems. Yes the plan is to have thoseboards up for sale at some point. Testing will be mostly important for me to know that I send working products. I like the idea of horizontal pogo pins using the spring force to hold the UUT in place, which only works for the 2-row versions. 

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  • in reply to Fred27

    Good points.

    The idea is to make an interesting chip (at least I think it is) more accessible for a range of people who tent to build their own systems. Yes the plan is to have thoseboards up for sale at some point. Testing will be mostly important for me to know that I send working products. I like the idea of horizontal pogo pins using the spring force to hold the UUT in place, which only works for the 2-row versions. 

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