Electronics Forum | Mon Jan 07 20:37:15 EST 2002 | davef
For soldered areas, we like to keep gold thickness substantially below the maximum you propose. Search the fine SMTnet Archives for our discussions on the topic of acceptable levels of gold with solder connections. Let�s fix this �no one seems be s
Electronics Forum | Wed Mar 01 17:13:15 EST 2000 | Dave F
Sorin: Formulas for calculating heat dissipation of traces don�t seem to provide practical results. But there are some wonderful tables and graphs that will meet you needs. You may need to do some finagling when calculating vias and through holes,
Electronics Forum | Sat Nov 25 18:45:19 EST 2000 | Ashok Dhawan
I am getting black spots / stuff while I run gold finish PCB through reflow soldering process using NC solder paste.The affected spots have intermetalic as black in color. Does not solder very well. I did look at the archieve but could not find info
Electronics Forum | Tue Sep 26 15:48:32 EDT 2000 | Dave Hulbert
I'm a bit confused about reading IPC-275 (I know I should have IPC-2221/2222) but I'm sure they are similar. Anyway, I am doing a: Military, less than 100V, non-conformal coated PCB, External Etch Sec 5.3.1.4 Edge Spacing.. (Pg 61) says use Tabl
Electronics Forum | Wed Mar 01 17:13:15 EST 2000 | Dave F
Sorin: Formulas for calculating heat dissipation of traces don�t seem to provide practical results. But there are some wonderful tables and graphs that will meet you needs. You may need to do some finagling when calculating vias and through holes,
Electronics Forum | Tue Jun 04 17:10:13 EDT 2002 | davef
First, �flash gold� is very loose language. It means different things to different people. �Flash� gold is a thin coat of immersion gold. Imm gold self-limits at ~0.3um[12uin]. And fabs put-down �flash� prior to electroplating thicker gold for wi
Electronics Forum | Mon Aug 16 20:32:10 EDT 2004 | davef
First, we didn't say "electrolytic soft gold with a minimum thickness of 5-8 of Au". We said, "'electrolytic soft gold' thickness 5 to 8uin". FOCUS. ;-) Second, we're unaware of an industry accepted specification that you can reference. IPC-2221
Electronics Forum | Thu Jan 09 15:19:41 EST 2014 | davef
For a typical wear surface application [millions of wipes], I agree with hege. You need to be talking electrolytic gold, NOT immersion gold. IPC-2221 says something like ... For edge connectors and areas not to be soldered: * Nickel - 2.5um [~100uin]
Electronics Forum | Wed May 30 17:49:49 EDT 2001 | davef
You are correct. IPC wants you to pay for that standard, regardless if you get a hard copy or download it. Generally, it�s pretty boring stuff for production types. [Although, you will recognize some of the goofy things your designers have done to
Electronics Forum | Wed Oct 24 18:09:44 EDT 2001 | davef
Allowing the board fabricator to define the board you expect to receive is fine, as long as they do a good job. Regardless of the existence of a clear product definition or not, it�s reasonable for you to argue that your receipts must meet the requi
