Electronics Forum: copper and pcb and contamination (Page 2 of 8)

cap size and copper thickness vs part size questions

Electronics Forum | Mon Nov 07 16:31:47 EST 2005 | CW

hi Bob, Thanks for the info. I understand your comments, but I am looking for specific guidance, If I am putting chip capacitors on a .063 FR4 board, what size package should we stay away from to avoid cracking? (I realize this is dependent on h

cap size and copper thickness vs part size questions

Electronics Forum | Mon Nov 07 12:25:32 EST 2005 | Rob

Hi CW, Larger chip caps can be susceptable to cracking, but mainly this is due to handling - flexing of boards is the main culprit (the part being mechanically joined at both ends to the board). PCB's usually flex easiest along one axis, and larger

distance from the edge Non-plated mounting hole and with copper pads ?

Electronics Forum | Fri Oct 26 05:03:17 EDT 2018 | farouk225

Hi everybody, I have a question about the minimum distance to leave beteween a non non-plated mounting hole with copper pads and the edge of the PCB. Is there any formula or rule to apply ? For example for a hole of diamater equals to 5.6mm which

Does any factory can produce 4 layers blind board with 3 OZ inner and outter layer copper

Electronics Forum | Thu Mar 12 08:38:47 EDT 2020 | floravictor

Hi, We can produce such pcb, we are pcb factory in Shenzhen. my skype: qjthomasxiao mail: victor@flora-ltd.com

Does any factory can produce 4 layers blind board with 3 OZ inner and outter layer copper

Electronics Forum | Thu Jun 11 09:28:57 EDT 2020 | pcbkathay

Dear Luciano, We are PCB manufactured based in China,we can produce the PCB as your requirements as soon as we can, please send the files to my email 284816044@qq.com looking foward to your email.

Does any factory can produce 4 layers blind board with 3 OZ inner and outter layer copper

Electronics Forum | Tue Mar 10 04:37:44 EDT 2020 | luciano_zhang

I have a files need produce in a urgent time. It's 4 layers PCB with 3 OZ inner and out layer quantity need 10000pcs ,any one know which supplier is aviliable?

Does any factory can produce 4 layers blind board with 3 OZ inner and outter layer copper

Electronics Forum | Thu Jun 11 02:32:54 EDT 2020 | beanzheng0

Hi, Luciano This is James from http://www.nextpcb.com We can do your order we have 2 manufacturers over 2500000sq. The 4 layer PCB boards on sale now. Please send your inquiry to support@nextpcb.com Or you can contact me on WhatsApp:+8613243830029 S

Imm Silver and Voiding

Electronics Forum | Thu Jun 22 00:16:24 EDT 2006 | Gman

Hello, Has anyone had issues with voiding while using Imm Silver PCB finish. Does thickness of silver, contamination of the plating bath or other factors if you come point out cause voids due to the plating.

Conformal Coat and RTV

Electronics Forum | Wed Jan 03 21:20:22 EST 2007 | davef

Comments are: * General purpose RTV (RTV-108) releases an acetic acid (vinegar) during cure and corrodes copper, brass and sensitive metals. It is therefore NOT for use in delicate electrical or electronic applications. However, there is an electrica

Re: Voids and BGA

Electronics Forum | Sun Mar 01 15:52:13 EST 1998 | Earl Moon

| From several months I am investigation about the VOIDS PERSENCE and his important as reliability. | One question now is : | It is possible that on the BGA components the voids are already present into the balls, before the mounting on the pcb ? | I


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