Electronics Forum | Fri Jan 07 01:05:40 EST 2000 | Dennis O'Donnell
I suggest you check out as many vendor at first as possible. Price varies greatly depending on your requirements. Once you find a company that has a price range that you are comfortable with, most can provide you with their formula so that you can
Electronics Forum | Mon Aug 12 18:45:31 EDT 2002 | russ
Don't be too sure that it is not your supplier! I have just gone through a similar problem and finally traced it back to PCB design which made the fab not very manufacturable except at a high end shop. What are the specifics of the board? 5mil trace
Electronics Forum | Mon Jul 28 08:54:52 EDT 2003 | davef
You are 100% correctomundo about ENIG. When it's good it's good, BUT when it's bad, you just want something else. You know you have black pad, when you see parts falling from the board. First, there is not perfect solderability protection. Second
Electronics Forum | Mon Jun 04 10:40:37 EDT 2012 | davef
I'm not aware of any such stipulation about witness [probe] marks for assembled boards, per se. Certainly, witness marks should not affect the intended performance of the assembly, you know, like damaging the solder connection or smudging solder mate
Electronics Forum | Tue Dec 18 14:48:15 EST 2018 | davef
NEED ADVICE: What do we want * "Hi anyone have recommended pcb manufacturer?" [https://smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=18483&mc=44] * "SMT manufacturers" [https://smtnet.com/Forums/index.cfm?fuseaction=view_thre
Electronics Forum | Thu Aug 23 15:38:58 EDT 2001 | mparker
Bingo - the mylar is the problem. Ask the fab vendor what storage and humidity controls they use on the photo tools. The films can changed geometry from day to day depending on the ambient environment. What controls are used during production? The ra
Electronics Forum | Mon Nov 26 20:15:50 EST 2001 | davef
Sounds like you are thinking correctly. I'd guess your fab has gotten "smart" and changed your bare board, as you suggest. So, you've got two choices: 1 Rework the QFP. 2 Remove the lower temperature PTH components and solder them to the board some
Electronics Forum | Mon Mar 29 14:58:08 EST 2004 | davef
Josh: Final cure of the LPI solder mask: 310*F for 45 minutes. Your board fabricator needs to do a better job. Most fabs do not check cure, because the processes subsequent to cure are so brutal that the fab expects the following process to highlig
Electronics Forum | Wed Sep 19 17:44:22 EDT 2007 | russ
there are IPC standards, I do not know them all off hand. What are the boards failing for? I have found that sometimes the original design is not optimum for any number of reasons. Some fab shops catch these and correct and may or may not inform yo
Electronics Forum | Fri Oct 12 14:53:40 EDT 2007 | chef
The only sophisticated customer I have is 100% ROHS and actually spec.s material and properties for the fab.'s. The rest have mostly just called in and requested we process ROHS without having to change the drawings or provide a spec. nary a complain
