Electronics Forum: stencil (Page 320 of 540)

solder ball

Electronics Forum | Tue Dec 31 10:06:37 EST 2019 | emeto

This one is easy. Go to 5mil stencil and reduce apertures in width. try to have 10mil aperture width and 10 mil distance in between. If you give us numbers we will be more precise.

solder ball

Electronics Forum | Wed Jan 01 22:19:33 EST 2020 | sssamw

Solder ball attached on solder joint without violation minimum electrical clearance is acceptable. If your process parameter including stencil not changed, suggest you check if solder pasted being pushed out after IC placement, also check if solder j

solder ball

Electronics Forum | Fri Jan 03 11:37:24 EST 2020 | emeto

Sometimes might be internal change with personnel. Issue is actually there, but if no one questions it-it is not an issue. With 7mil stencil there is a good chance to have solder balls. So were they registered or were they fixed/cleaned?

LGA voiding

Electronics Forum | Tue Dec 31 11:48:36 EST 2019 | emeto

Hello experts, I have a 50mmx50mm LGA on a PCBA. I Would like to decrease voiding in these joints and I wanted to hear about your techniques to decrease voiding. Stencil is currently 5mil. SAC305. ENIG finish.

LGA voiding

Electronics Forum | Thu Jan 02 10:30:42 EST 2020 | emeto

thank you Steve, when you mention Stencil design, what do you refer to? How about the Reflow profile? Any specifics that I should look for. Everything is in my process window, but some detail towards this package might be very helpful.

LGA voiding

Electronics Forum | Fri Jan 03 02:03:58 EST 2020 | sssamw

What's your target for voiding? I cannot see it violate 25% of solder joint area. Process setting and PCB design can impact the voiding, many factors, such as PCB pad, stencil aperture and thickness, re-flow profile, solder paste, etc.

LGA voiding

Electronics Forum | Fri Jan 03 12:48:23 EST 2020 | cyber_wolf

Besides correct stencil design, solder paste chemistry can have a profound effect on voiding. People will tell you reflow profiles. I have never in my career seen a reflow profile have any effect on voiding unless it is grossly off.

LGA voiding

Electronics Forum | Tue Jan 14 16:57:52 EST 2020 | emeto

Still considering going from 5mil to 4mil stencil. Concern is the 50mm part might have issues with contact on the outside rows.

Benefit of GridLok screen printer ?

Electronics Forum | Sun Jan 05 05:14:00 EST 2020 | gaintstar

Automatic Stencil printer, I suggest GKG G5 printer, price 20000USD and best quality in the world, sold thousands set already. please contact me by email sales@flason-smt.com for more information.

Stencil nano coating worn out

Electronics Forum | Fri Jan 10 10:37:34 EST 2020 | dontfeedphils

What sort of nano coating? The coatings that aren't snake oil tend to have a color to it. The other ones are typically wipe on and seem like a waste of time to me.

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