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October 2004

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Subject:
From:
"Wenger, George M." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Wenger, George M.
Date:
Fri, 1 Oct 2004 18:24:40 -0400
Content-Type:
text/plain
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text/plain (80 lines)
I don't know what alloy you are using but it sounds like it probably has
properties similar to Alloy 42 or Kovar.
 
1. You can expect to have solderability failures or issues since you're
trying to solder to an iron alloy rather than a copper base metal or a
nickel plated base metal.
2. You can also expect that you might experience mechanical stress
induced cracking because of the lack of a good metallurgical
interconnection.
3. You can also expect that you might experience temperature cycling
induced thermal-fatigue failures

The degree of problem expectation depends heavily on the quality of lead
plating from your vendor and also the use environment.  My telecom
experience indicates that TSOP packages with Alloy 42 or Kovar 
material will always lead to problems in outdoor environment use.  For
controlled indoor environment one might hope (and pray) to have 2 to 4
year reliability.  For these reasons we highly recommended to designers
to choose alternative packaged components.


Regards,
George
George M. Wenger, Andrew Corporation
Reliability / FMA Engineer
Base Station & Subsystems Group
40 Technology Drive, Warren, NJ 07059
(908) 546-4531 [log in to unmask]
 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor G. Hernandez
Sent: Friday, October 01, 2004 4:19 PM
To: [log in to unmask]
Subject: [TN] DIP Lead Frame Base material Fe Ni Cr

Fellow TechNetters,

   Can someone share their experience using an Fe Ni Cr lead frame base
metal?   This base material is used without a nickel barrier alloy prior
to lead plating.   What type of failures could be expected?

Victor,

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