Electronics Forum | Sat Dec 10 07:03:59 EST 2005 | mdemos1
Hi. I am trying to find out the minimum copper thickness I should see on a through hole barrel. The board has 1 ounce copper and the board thickness is 0.062". I am finding thicknesses of 0.6 to 1.2 mils. Thanks, Mike.
Electronics Forum | Fri Jan 07 09:03:44 EST 2022 | jineshjpr
Hi Everyone, I want to understand what is the copper thickness to be maintained in PTH Barrel hole. Is this same as Fab recommendation of surface finished copper thickness like 25/35/70 microns..??? Is there any specific IPC standards available to un
Electronics Forum | Mon Jan 10 03:45:23 EST 2022 | proy
YES there is an IPC target/acceptable spec In general terms the barrel thickness in the hole should be 1 mil (thou). IPC has an allowable limit lower around .75 with some other factors. I have been checking barrel plating on all incoming boards since
Electronics Forum | Sat Nov 08 09:10:16 EST 2008 | davef
SN100 was designed for selective soldering and producing low levels of voiding. But thin barrel plating is a common cause of voids in wave and selective soldered connections, as you say. As a result, you checked the plating thickness and it was accep
Electronics Forum | Wed Jan 11 11:52:50 EST 2017 | emeto
First, why do you have paste on the opposite side of the component. I would recommend having it on the same side. Second, how thick is your stencil? Pin in paste requires thickness, to fill the whole barrel. Stencil should be really thick. Try to man
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 | Fri Oct 08 09:43:27 EDT 2004 | davef
First, don't get too excited about the thermal capabilities of conductive epoxy. An epoxy like DuPont CB-100 increases the amount of heat conducted through the barrel, but many over estimate what it can do. Calculations show for a 0.020" drilled
Electronics Forum | Wed Sep 27 19:37:32 EDT 2000 | Dave F
Wolfgang is correct. Copper plating thickness of the via barrel walls is a key question you need to answer to troubleshoot this. Tenting is a red herring.
Electronics Forum | Tue Feb 24 09:52:14 EST 2004 | davef
First, two points about hole / barrel fill are: * A filled hole is an excellent indicator of the optimum process and optimum quality PCB. * The study that showed that holes need not be filled was paid for by the US Army and performed by Lockheed in
Electronics Forum | Tue Jul 26 11:02:30 EDT 2005 | dphilbrick
I have a single sided PCB that contains 4 RF connectors that will require conformal coating. Sounds easy, well the RF connector is .080 in diameter and stands a whole .050 in height. The sub-straight that the barrel sits on is about .020 thick. I don
