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UFBGA Paste Stencil Recommendation

billymit
Visitor

Hello,

 

I'd like to use the STM32WLE5 in an upcoming design. Looking at the datasheet, I noticed the recommendation for the BGA package is to have the stencil opening larger than the pad diameter, instead matching the ball diameter . To me this seems counterintuitive, as I would typically reduce the paste for balls <0.4mm in diameter. Can anyone help me understand this recommendation?

Thanks,

Billy

 

billymit_0-1756934944815.png

 

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