Electronics Forum: alpha ws809 tombstoning (Page 1 of 1)

Leaded Water Soluble recommendation needed

Electronics Forum | Wed May 29 18:52:59 EDT 2013 | navworx

Would like opinions on which brand of leaded water soluble solder has the longest print life. we're currently using Alpha WS-809. Each board goes through the printer every 15 minutes or so, and we wind up re-printing most boards as the solder isn't

Tombstoning issues!!!

Electronics Forum | Thu Apr 10 07:47:47 EDT 2008 | ck_the_flip

Stencil design and pad layout are key. Too far apart - bad. If your pad geometry is correct, try the inverted home plate. That has worked well for me in the past. That, coupled with a 5-mil stencil. With regard to solder paste, some manufacturer

Re: Tombstoning

Electronics Forum | Fri Jan 07 05:37:31 EST 2000 | Mark Alder

Hi Niel Manson of Alpha Metals U.K. did extensive research on this subject. He can be contacted at neilmanson@alphametals.cookson.com. Regards Mark Alder

Lead Free Stencil Design

Electronics Forum | Wed Jul 13 14:56:53 EDT 2005 | jdengler

I read the Cookson/Alpha paper "Optimizing stencil design for Lead-free SMT processing". I interpreted it to mean that if you had a mid chip solder ball (MCSB) problem the "radiused inverted home plate of 20/60/20 style" had the greatest impact on r

0201 pad layout

Electronics Forum | Fri Jan 06 13:47:15 EST 2012 | davef

Your starting [and finishing] point should be IPC-7351B Land Pattern Calculator and Tools - http://landpatterns.ipc.org/default.asp For more, look here: * http://www.smtnet.com/bob-willis/pbdai.html * http://www.onboard-technology.com/pdf_novembre


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