Electronics Forum | Mon Dec 06 14:44:41 EST 2021 | dwl
1 to 1 stencil aperture to pad should be fine on the gull leads, and yield 100% coverage with leaded solder. The thermal pad is going to be a challenge though, if you truly need 100% coverage. There will be out gassing from the flux and this will nee
Electronics Forum | Wed Jul 03 15:14:18 EDT 2024 | SMTA-74487602
I'm hoping to hear what others are doing regarding "recycling" paste. By recycling paste, I'm referring to an operator taking the paste left over on a stencil after a work order is done and putting it either back into the jar it came from originall
Electronics Forum | Fri Sep 17 23:59:40 EDT 1999 | JAX
| | | HI everyone, | | | | | | We are using a Siemens ap-25 screen printer, in the past we have not had any problems with adhesive placement until a couple of weeks ago. It seems the x axis has decided that it should be set somewhere between .00
Electronics Forum | Tue May 18 15:36:18 EDT 1999 | Tony
| | | What is the best way to re-ball a BGA? Who has the best system for doing it? | | | | | I'm using our SRT rework stuff to reball in house - when necessary. Of course, we only do this for protos and test boards. We use a standard micro-stencil,
Electronics Forum | Mon Feb 22 14:21:14 EST 1999 | Rick Wyman
| | Hey all- | | | | My question is this: My stencil printer operator has said that he has to | | wipe our 6-mil stencil each pass to get the paste in the 20-mill pitch | | aperatures for a QFP to release well. We are using Amtech NC-559 type 3 |
Electronics Forum | Mon Nov 16 12:41:46 EST 1998 | MMurphy
| | | | | I keep hearing about polyimide stencils, but what are they like in terms of registration and aperture accuracy? | | | | | | | | | Fraser- | | | | | | | | We use polyimide stencils with great success for our prototype boards. They are
Electronics Forum | Tue Aug 25 20:33:31 EDT 1998 | Karlin
| | | | Hi, | | | | Does anyone has experiences in reflowing Ceramic BGA and found solder wicking ? Solder wicking has the syndrome that solder being wick from the pad and ended up in the leads. | | | | We have rule out the possibility of not printin
Electronics Forum | Tue Sep 24 22:29:04 EDT 2002 | davef
First, I don't have a clear fix on the problem. Please drill-down to more detail. We appreciate that you probably don't know the parlance. Just describe what you have and then what you'd like to have. Second, most 0402 LED are fabricated just lik
Electronics Forum | Wed Sep 15 22:01:34 EDT 2004 | rohman23
We've had a few problems with printing a flex-rigid PWB, and I'm hoping some of you could throw some opinions/suggestions my way. Our PWB is about 8" x 11" divided into two parts (side A & B) by 2 wide flex cables. Each of these flex cables is ab
Electronics Forum | Fri Jan 05 12:17:31 EST 2007 | Cmiller
Our first pass yield across all our products is above 95% but we include anything that does not meet IPC standards. Probably 75% of our failures are not electrical. AOI is a great tool to get a consistent measure of your process. I dont know how anyo
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