Electronics Forum: stencil (Page 153 of 540)

To use a mini stencil, or not to use a mini stencil.

Electronics Forum | Fri Mar 30 11:56:08 EDT 2007 | JD

We have had issues with using the ones from Best. The holes are not always cut correctly and the edges (inside the holes) are not well defined because of the kapton material they use maybe. Plus you leave the mini stencil on the PCB under the BGA whi

0402 aperture design lf

Electronics Forum | Thu Apr 12 10:01:43 EDT 2007 | realchunks

Hi aj, Pete is right, there are several variables that can affect your quality when it comes to stencil design. A good idea is to have a stencil made with various designs incorporated into it. A lot of engineers like the reverse homeplate design.

Stencil Thickness

Electronics Forum | Fri Jun 15 18:48:49 EDT 2007 | prologic

We have not processed very much 0402 size components in the past. We are finding that alot of our customers are upgrading their circuits and going with 0402 size parts. We recently processed one such circuit and odered a paste stencil 6 mil in thickn

Stencil Thicknes vs. actual solder height measurements

Electronics Forum | Tue Dec 11 19:48:37 EST 2007 | arun2382

Hi, If I were working with a 75 um thick stencil, Is there a spec. as to what the maximum value allowed on actual solder height measurements? Stencil type: Laser cut and electropolished Solder paste type: Type 4 Sn-Sb Would the measured values va

Stencil Design Question

Electronics Forum | Thu Feb 14 10:59:37 EST 2008 | stevezeva

Maybe what you could do is have the stencil contain a tightly spaced mesh or grid of openings over the ground plane areas that you need to be solder covered. Also, to help the solder flow out better, you might want to decrease the percentage of metal

Stencil Design

Electronics Forum | Mon Jun 01 18:44:54 EDT 2009 | scunneen

Hello there, I have a new board, fairly heavily populated with a number of FPBGA on it. The smallest has a pitch of .4mm.I have 3 questions, 1st what is the best appeture for this small pitch. 2 Will type 3 paste work or will I need type 4, and fina

BGA flux dipping process

Electronics Forum | Tue Jun 02 22:19:17 EDT 2009 | mikehe

We have been doing BGA's for years now, and I would suggest updating your profile and place a thermal couple on the BGA, keep in mind the bigger the part the more heat it will need, We stencil print all of BGA's from simple bga's to complex ones, you

Finding a white strand on fine pitch components

Electronics Forum | Fri Aug 28 05:07:59 EDT 2009 | sachu_70

Do you clean the stencil manually or using the automated under-stencil cleaner on your Printer (recommended)? 1. Ensure that stencil wipes are lint-free and soaked sufficiently with solvent before use. 2. If your printer supports automated cleaning

super fine pitch paste & dispensing questions

Electronics Forum | Mon Aug 16 14:43:44 EDT 2010 | dan_ems

Hello, i don't know if is possible to dispense paste but for reduction of cost we use a diferent type of stencils, from aluminium of 0,2 mm, purchased from a typography of newspapers. Ofcourse the pcb for what we use this stencil are simple. But th

Stencil Inspection

Electronics Forum | Tue Mar 22 14:07:43 EDT 2011 | remullis

I've never done flex boards so I cant't say what tolerances you would need to maintain. Does you stencil manufacturer provide a QA data sheet with your stencils? If so I would specify to them the critical apt sizes in areas and push it back on them t

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