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 | Thu Mar 02 00:40:20 EST 2000 | Low
hi, wonder anyone has done the electrical analysis of Alloy 42 as used in TSOP? I am interested in obtaining the rel. permeability of the ferromagnetic material... where can I find more info? thanks and regards, hong guan low
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 | Thu Mar 02 00:40:20 EST 2000 | Low
hi, wonder anyone has done the electrical analysis of Alloy 42 as used in TSOP? I am interested in obtaining the rel. permeability of the ferromagnetic material... where can I find more info? thanks and regards, hong guan low
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 | Thu Mar 02 20:57:16 EST 2000 | Dave F
Hong Guan: When thinking about high nickel alloys: � Kovar, Alloy 42, and Invar are generally thought of as hermetic sealing materials, because of their coalescence with glass, platabililty, and coefficient of thermal expansion properties. � Permall
Electronics Forum | Thu Mar 02 20:57:16 EST 2000 | Dave F
Hong Guan: When thinking about high nickel alloys: � Kovar, Alloy 42, and Invar are generally thought of as hermetic sealing materials, because of their coalescence with glass, platabililty, and coefficient of thermal expansion properties. � Permall
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 | Tue Sep 30 21:00:41 EDT 2003 | davef
We're not clear on what you seek. So, as a starting point for our discussion, we wouldn't get agitated if we saw "routine" coplanarity of 4 thou. For instance: Maximum Lead Coplanarity [Altera] Package||Acronym||Lead material||Finish||Maximum Lead
Electronics Forum | Wed Oct 01 13:39:13 EDT 2003 | arturoflores
They take the solder in a dip and look solderability test but when in normal reflow process we got some pins that do not get wet and the appearance is as follows: -Pillow effect on the toe(no front fillet is formed) -There is a sheet of flux between
