Hi Wayne - I think that you received some inaccurate information on the
compatibility of ENEPIG. There is substantial published testing on the
reliability of the ENEPIG surface finish and it is fairly robust. There
can be a Pd embrittlement issue (similar to gold embrittlement phenomenon)
if the ENEPIG surface finish isn't specified correctly and the soldering
process is not controlled. Otherwise the ENEPIG surface finish is good for
a wide variety of product applications.
Dave Hillman
Rockwell Collins
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"Thayer, Wayne - IIW" <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
06/28/2010 06:54 AM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
"Thayer, Wayne - IIW" <[log in to unmask]>
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Re: [TN] QFP short at top of the leads
Unstable intermetallics, apparently due to Pb and Pd refusing to form any
intermetallic compounds. I recall the days of PdAg finishes on ceramic
capacitors--SnPb eutectic solder had weird wetting characteristics where
the joint would "bloat" far away from where the heat was applied.
I've also seen odd intermetallic behavior with Bi alloys.
Wayne
-----Original Message-----
From: Wenger, George M. [mailto:[log in to unmask]]
Sent: Monday, June 28, 2010 7:34 AM
To: TechNet E-Mail Forum; Thayer, Wayne - IIW
Subject: RE: [TN] QFP short at top of the leads
Wayne,
What makes ENEPIG incompatible with SnPb solder?
Regards,
George
George M. Wenger
Andrew Solutions
Senior Principal FMA/Reliability Engineer
40 Technology Drive, Warren, NJ 07059
(908) 546-4531 (Office) (732) 309-8964 (cell)
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Thayer, Wayne - IIW
Sent: Monday, June 28, 2010 7:21 AM
To: [log in to unmask]
Subject: Re: [TN] QFP short at top of the leads
Need to know the metallurgy. What is the lead plating spec, and what
alloy are you soldering with? Note that ENEPIG is incompatible with SnPb
solder.
Wayne Thayer
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Rex Waygood
Sent: Monday, June 28, 2010 6:53 AM
To: [log in to unmask]
Subject: Re: [TN] QFP short at top of the leads
Are these virgin parts?
Are the leg to pad joints 'good'?
Rex
Rex Waygood
Technical Manager
Hansatech EMS provides value manufacturing through engineering and
quality
Hansatech EMS Limited
Benson Road
Nuffield Industrial Estate
Poole
Dorset
BH17 0RY
+44 (0)1202 338200
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Iven, Jowan
Sent: 28 June 2010 10:08
To: [log in to unmask]
Subject: [TN] QFP short at top of the leads
Has anyone ever seen a QFP where shorts occur after soldering at the top
of the leads?
And the leads look pretty dull after soldering. Any ideas?
A picture is available at
http://ipc-technet.groupsite.com/uploads/galleries/x/000/020/5ba/technet
01.jpg
Jowan Iven
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