In a message dated 08/02/2000 10:18:09 AM Central Daylight Time,
[log in to unmask] writes:

<< 'Netters:

 This post is a follow on to Steve's recent post and responses about tinning
 connectors.

 I am very sensitive to the requirement about removal of gold from 95% etc
 etc as stated in J-Std-001. So whenever we see something that appears Gold,
 we double solder-dip the part.

  However, what I'd like to know is.....

 1) How common is this GXT(tm) finish? Do most "Gold leaded" devices have
 this finish?
 2) Are there any Class 3 builders out there that use parts with this finish
 "as is"?
 3) Does soldering the part "as is" result in normal looking solder joints?
 4) Are qualified parts (e.g. Mil-C-55302) allowed to have this finish?

 Thanks to all who can respond.

 Bill Kasprzak
 Moog Inc. >>

Hi Bill!

I looked over the spec, and it doesn't show anything but gold over
nickel...but I didn't go over ALL the specs amendments. They can be found at:

http://www.dscc.dla.mil/Programs/MilSpec/ListDocs.asp?BasicDoc=MIL-C-55302

The basic spec can be downloaded at:

http://www.dscc.dla.mil/Downloads/MilSpec/Docs/MIL-C-55302/mil55302.pdf

That's the one I looked over, it did say that you could have a connector that
had tin/ lead solder tails, but the plating must be at least 100-microinches
thick. It also went on to say that pre-tinning by dipping is acceptable as
long as it met some other spec (I forgot which one). Didn't see anything
about GXT though...

-Steve Gregory-

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