Electronics Forum | Thu Dec 06 15:09:14 EST 2001 | smtspecialist
Thanks for the info, Of course the first thing to do was to look with my supplier, but the problem was that it's a special relay, custom made from a design created 10 years ago. Two years ago that company went BK and we had to order a whole bunch t
Electronics Forum | Wed Dec 12 07:38:04 EST 2001 | smtspecialist
I have observed the same thing with solder composition in this case I am using 63/37 NC which is giving good results usualy. The liquid tin, product from MG Chemical that I used is to tinplates copper circuit on PC boards. I tried on few relays, it
Electronics Forum | Wed Dec 05 17:23:41 EST 2001 | davef
Now there�s a conundrum. You want the �best way to clean leads�, but you want to use the worst type of flux for cleaning leads. You say, �20% copper exposed� � * What happened to the solderability protection during this two-year storage? Wouldn�t
Electronics Forum | Thu Jun 28 09:38:14 EDT 2012 | 14367
PSMN130-200D MOSFET TRANSISTOR D2PAK - failure of some parts led to investigation, oxidization or surface contamination was noticed on remaining parts. The surface contamination could be removed when fingernail was drawn over the bottom terminating s
Electronics Forum | Thu Jun 28 09:38:20 EDT 2012 | 14367
PSMN130-200D MOSFET TRANSISTOR D2PAK - failure of some parts led to investigation, oxidization or surface contamination was noticed on remaining parts. The surface contamination could be removed when fingernail was drawn over the bottom terminating s
Electronics Forum | Fri May 23 23:47:46 EDT 2008 | dint46
Wayne; Several things. 1.check the vendors and see what black oxide they are using are they the same ? It might be that. 2.You should bake your pcbs before the thermal stress is applied. To remove moisture. At your shop. The proce
Electronics Forum | Mon Feb 06 10:02:14 EST 2006 | Yash Sutariya
Sorry. I actually should clarify those slides. Black pad is not associated with tented vias. Also, you can tent vias with soldermask, but this requires the immersion gold process to be completed prior to soldermask. As such, all copper features (
Electronics Forum | Fri May 23 23:58:48 EDT 2014 | edriansyah
Hi Hege. I was not also too confident with the black pad (coz no black residue on the remaining pad). But based on my search on the internet regarding black pad. Most of them shows a very clean BGA Pad after peel off the BGA as the picture reference
Electronics Forum | Thu Aug 21 22:10:07 EDT 2003 | adlsmt
Well, for some reason the board house will pay for the boards but has some issue with paying for the parts on them. Why am I not supprised? Perhaps I have mis-diagnosed the problem. We have found two different board p/n's with the same type of defec
Electronics Forum | Mon Aug 10 11:28:19 EDT 1998 | Justin Medernach
| Is there any problem using SMT on gold boards? 15 years ago we were told not to use gold boards, but I can't remember why. Judging by the other postings it now appears to be common. Only problem I see is that the nickel should be plated, not ele
