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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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  • I like this - it is a good idea. (Because I am not set up to handle BGAs yet)

    As someone who might buy such a product, I prefer the last option if it comes with the crystal and chip pre-assembled, because it can be inefficient to buy a specific crystal for a specific footprint in single quantity.

    I would not run something like this from a breadboard, I would always solder it to a custom MCU PCB, so smaller is better.

    With 0.05" pitch I wouldn't be running traces between pins, but it would be nice to be able to run traces between the 2 rows of pins instead of creating a large no-fly zone where the module sits.

Comment

  • I like this - it is a good idea. (Because I am not set up to handle BGAs yet)

    As someone who might buy such a product, I prefer the last option if it comes with the crystal and chip pre-assembled, because it can be inefficient to buy a specific crystal for a specific footprint in single quantity.

    I would not run something like this from a breadboard, I would always solder it to a custom MCU PCB, so smaller is better.

    With 0.05" pitch I wouldn't be running traces between pins, but it would be nice to be able to run traces between the 2 rows of pins instead of creating a large no-fly zone where the module sits.

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