Electronics Forum | Thu Mar 02 16:45:17 EST 2000 | Carol Zhang
Low, You can go to www.matweb.com and check the information by just type alloy 42 to search. Hope you can find some helpful information. Carol
Electronics Forum | Tue Sep 30 20:05:34 EDT 2003 | afm
Does alloy 42 lead frame on a QFP100 make lack of coplanarity (let's say 2 mils), a critical factor to have non-wetted leads? Lead coating is tin lead 90/10. afm
Electronics Forum | Sat May 09 13:49:03 EDT 1998 | EFData
Awhile back, I remember seeing some postings regarding solderability of Alloy 42; unfortunately, at that time, it wasn't a concern of mine but it is now. There was a gentleman from TI who seemed to do some extensive research into the matter; do any o
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 | Wed Oct 01 15:06:50 EDT 2003 | davef
You're thinking correctly. Concentrate your recipe development efforts by profiling directly on the pads [that some fine designer forgot to thermally isolate properly] of those pesky corner leads that don't solder well.
Electronics Forum | Thu Jun 23 00:28:42 EDT 2005 | KEN
....how does the part perform in a wetting test. Is it solderable on a bench or dip-plating in a pot? If you add flux and heat can you fix your problem assemblies? If yes, plating finish or substrate is not your problem. What flux are you using?
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.
