From the list given I believe that the X here is the same as your mathematical unknown. I represents any solder constituent with the exception of Bi, which is handled by the separate category (e6) So alloys such as Sn3.5Ag0.74Cu0.21Zn would be covered in the e5 category.
Jeffrey A McGlaughlin, CID
Engineering Designer
Systems Development Engineering Services
Room 4-2-50
Phone (614)424-7582
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of James Jackson
Sent: Monday, March 18, 2013 10:12 AM
To: [log in to unmask]
Subject: [DC] IPC-1066 Question
In looking through the IPC-1066 document (Rev ? - January 2005), in 5.1 Solder
Finish Categories, there are several 'e' categories that can be added via
labeling, to an assembly.
I am not sure what 'X' is (well, in math, it's an unknown).
For example, e5 - SnZn, SnZnX (no Bi)
Sn = Tin
Zn = Zinc
X = ???
Has the periodic Table of Elements just recently added a new element called
'X'?
What am I missing here?
The closest that I can find might be Xe - Xenon, but I would think that would
have been stated as such.
It is not only in the e5 category, it is also in the e2 category.
I want to understand this. I know that many jokes can (and - knowing this
group - will) be made about this... I can think of a few myself.
I have to show this IPC labeling spec to my manager, and if he asks me and I
just shrug my shoulders and give an "I dunno..." answer, I won't look too
intelligent (it don't take much).
If this is a goof on the part of the IPC - it don't make them look too good
either.
I'm sure that it is something that I am overlooking, and I will be told
shortly what it is.
Thanks for any serious (and... I suppose the not-so-serious) input on this.
Regards,
James Jackson
Oztronics
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