Electronics Forum | Fri Aug 14 07:27:42 EDT 1998 | Earl Moon
| | Hi, can you please tell me how to make green coating and through-hole plating of PCB? Thanks! | | Xingsheng | Xingsheng: Welcome. | Bible on PCB fabrication: Printed Circuits Handbook, Clyde Coombs, McGraw-Hill | Web resources: http://www.pw
Electronics Forum | Fri Aug 14 08:59:51 EDT 1998 | Dave F
| | | Hi, can you please tell me how to make green coating and through-hole plating of PCB? Thanks! | | | Xingsheng | | Xingsheng: Welcome. | | Bible on PCB fabrication: Printed Circuits Handbook, Clyde Coombs, McGraw-Hill | | Web resources: htt
Electronics Forum | Wed Feb 05 19:43:34 EST 2003 | iman
If by the Powers Ta Be (customer/designer), you can't change the PCB design, negotiate for the PCB fab house, to block the via holes with their (green?) solder mask some customers/designers want to have via holes to be present in the PCB pad, due to
Electronics Forum | Thu Feb 06 14:47:50 EST 2003 | MA/NY DDave
Hi "some customers/designers want to have via holes to be present in the PCB pad, due to some belief that it helps in heat dissipation. " As I think about this I don't know exactly why they would be concerned. I can imagine in some exotic products
Electronics Forum | Wed Feb 05 21:05:38 EST 2003 | davef
Iman On your situation: As an earlier poster stated, your options are limited to opening you stencil aperture to compensate for the paste lost to the via. On your designer's belief that "it helps in heat dissipation": Could be true, but: * Hole wil
Electronics Forum | Fri Jan 06 00:03:10 EST 2023 | SMTA-64419298
Hello Evtimov, sorry...just saw post as I was looking through list...a bit late. I don't know if you ever got your answer. IPC-4552A covers EniG finishes and suggested shelf life. I've referred to these doc's quite a bit. Good spec's ! Yes, I beli
Electronics Forum | Thu Jan 13 17:46:04 EST 2011 | davef
We've never seen the defect that you describe, but in wave soldering-land blowholes usually are caused by moisture in the board that out-gasses through the too thin plating of through holes. * Bandaid fix: bake the boards * Long-term fix: Obtain boar
Electronics Forum | Thu Feb 05 08:39:16 EST 2004 | davef
IPC-2222 - Sectional Design Standard For Printed Board For Organic Printed Boards, Table 9-3 � Plated Through Hole Diameter To Lead Diameter Relationships will give you the standard information you require.
Electronics Forum | Tue Oct 27 16:22:00 EDT 2009 | davef
It's not the first thing we think of in looking at your picture. First off, the lack of copper in the region of the red oval makes us think of a plating defect. We don't expect that moisture out-gassing through the barrel wall to show-up on opposite
Electronics Forum | Tue Nov 02 16:57:45 EDT 2021 | rstellema
I am in need of a technician experienced in repairing older through hole machines (Universal Model 6241B). I'm located in Montreal, Quebec, Canada. If you know of someone, please contact me or respond to this posting. Thank you, Ron
