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863 expert questions.

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Nov 12, 2025
How to Re-qualify BGA Spheres
What procedure would you recommend to "re-qualify" a lot of BGA spheres. We keep our spheres in a ...
J.D.

Dec 1, 2022
Pick and Place Machine Calibration
In general how often should we calibrate pick and place machines, or run a placement machine process capability ...
B.O.

Nov 30, 2022
Extending Shelf Life for Jars of Solder Paste
We have a few unopened jars of solder paste that have just recently gone past the posted expiration ...
Y.S.

Nov 29, 2022
Profiling for Double Sided BGA
We are about to produce double sided BGA boards - BGA components on both sides. What advice would ...
B.O.

Nov 28, 2022
Solder Balling Prediction Formula
We have experienced mid chip solder balling on some passives. Is there a mathematical calculation that can be ...
R.W.

Nov 23, 2022
Stencil Cleaning Frequency
What is the industry standard for the amount of time between stencil cleaning? ...
C.C.

Nov 22, 2022
Exposed Copper Risk
We received many PCB's where a modification have been completed. The modification involved soldering a chip cap to ...
A.H.

Nov 21, 2022
Initial Screen Print Test Board
Is it recommended to print one cycle before printing the first production board? I could use a scrap ...
S.G.

Nov 18, 2022
Stencil Pattern for Thermal Pads on QFNs
We need more information regarding the stencil pattern for thermal pads on QFNs. We know why it is ...
C.P.

Nov 17, 2022
Moisture Sensitivity Level for Bare Boards
I am trying to ease our way through a NADCAP audit and I am having some trouble with ...
J.C.

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