Electronics Forum | Tue Jun 07 16:19:58 EDT 2005 | davef
Q1) How to identify on good or bad ICs lead that could contribute to dewetting? A1) Distinguish between good or bad IC that could contribute to dewetting by testing for solderability, according to J-STD-002. Q2) What actions that must be taken in fa
Electronics Forum | Tue Apr 11 20:26:16 EDT 2000 | Dave F
Jeremy: Parts assembler make leads of either Alloy 42 (Invar, whatever) or copper. The solderability of these leads are protected with eutectic or non-eutectic tin/lead solder, palladium or some palladium alloy, or gold. Cuppla things to consider:
Electronics Forum | Thu Oct 03 10:02:08 EDT 2002 | davef
Your problem is likely not the Pd-Ag surface layers, but the underlying metal to which you need to wet. Either a base metal is: * Contaminated and poorly wettable. OR * A material [eg, Alloy 42 (check with magnet), Kovar, etc] that is inherently dif
Electronics Forum | Fri Jun 09 10:14:38 EDT 2006 | pjc
The leads may be that Alloy 42. I would look to be sure your peak temp at reflow is over 220C, like 222C is nice. Also check that time-over-liquidous is meeting solderpaste mfrs. specification.
Electronics Forum | Wed Jun 14 12:25:50 EDT 2006 | Rob
Hi Shawn, See if you can get hold of a free tub of Koki S3X58-M406, it claims to be good with Alloy 42. http://www.ko-ki.co.jp/product/new_product.html#new03 Cheers, Rob.
Electronics Forum | Thu Mar 31 19:52:50 EST 2005 | davef
We agree with Russ that you're talking palladium instead of platinum. Your wetting problem likely is not the Pd-Ag surface layers, but the underlying metal or nickel to which you need to wet. Either a base metal is: * Contaminated and poorly wettabl
Electronics Forum | Wed Apr 06 21:37:35 EDT 2005 | KEN
Are you saying you have solder balls (as in solder paste balls) at the lead tips (or land tip)? This means your thermal profile is not hot enough. why the sudden cahnge? I will bet the lead frame material was copper and is now alloy 42. sounds like
Electronics Forum | Tue May 23 20:44:13 EDT 2000 | Dave F
Sal: You and Wolfgang are spot on, but let's see if we can blow this out a bit. Before proceding to rattle on ... � PC Card. A credit card-size computer peripheral that add memory, mass storage, and I/O capabilities to computers in a rugged, compa
Electronics Forum | Tue Oct 15 17:54:08 EDT 2019 | davef
From J-STD-001: Components designed for pin-in-hole application and modified for butt connection attachment, or stiff-leaded dual-inline packages (e.g., alloy 42, brazed or tempered leads) may be modified for use on Class 1 and 2 products but shall n
Electronics Forum | Mon Dec 05 17:53:04 EST 2005 | KEN
I hate to sound like a broken record but the industry has been placing lead free through-hole parts forever. Now all of a sudden its a problem??? Gold finish, silver, silver paladium, alloy 42, even pure copper. Reliability will be a function of t
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