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- OT: a presentation on Lead-free solder
July 5, 2010, 7:24 am
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I'm constructing a talk/presentation on PbF for the local-to-me part of the
science cafe movement
Title something like
A 21 century plague: some reasons for failures/problems in electronic
If anyone knows of a public domain published like-for-like test between
conventional and Pbf boards+components ?
I suspect accelerated aging (HALT etc) via thermal +humidity cycling and
show something like a 3 to 1 advancement of aging before solder faults
emerge, but cannot find any such openly published results.
Anyone here familiar with automobile engine management / control electronics
issues with PbF, not in-car entertainment issues.
Anyone familiar with de-tinning of tin-tinned components / deballing
+reballing of BGA etc in the defense/aerospace/medical spheres? Problems
specifying/guaranteeing components etc are [lead-free]-free if you see what
My email address for anyone not wishing to be on public record ,
minus the ZZZs. Small text only not pics or large files, I can relay a
non-internet divulged account for that purpose , if necessary.
Re: a presentation on Lead-free solder
Can anyone put age/years interpretation to the green/yellow/red solder-type
rankings in this publically available document?
Unfortunately, this test data demonstrated that for some component types the
lead-free solders failed before the
SnPb control. References 1 & 2 stated that models for calculating the
actual field lifetime of lead-free solder joints
on certain component types will need to be developed due to their reduced
life capabilities relative to SnPb.
Vibration testing was conducted by Boeing Phantom Works (Seattle) for the
Joint Council on Aging Aircraft/Joint
Group on Pollution Prevention (JCAA/JGPP) Lead-Free Solder Project. The
JCAA/JG-PP Consortium is the first
group to test the reliability of leadfree solder joints against the
requirements of the aerospace/military community
Test vehicles were specially constructed circuit cards, capable of instant
detection of failure of all components.
Each test vehicle was 12.75 inches by 9 inches in size, 0.090 inches thick
and was populated with 55 components
consisting of ceramic leadless chip carriers (CLCC's), plastic leaded chip
carriers (PLCC's), TSOP's, TQFP's,
BGA's, and PDIP's. Sets of identical components were used in different
positions on the cards. The circuit cards were supported by WedgeLoks on
the two 9 inch edges. Thirty circuit cards were vibration tested.
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