Hello Richard,
Many thanks for your advice !
Best Regards,
----------------------------------------------------
Marcel van den Berk
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard
Sent: donderdag 13 oktober 2005 20:05
To: [log in to unmask]
Subject: Re: [TN] solderjoint reliability
I am assuming that the live temperature cycling while powered up in the
service cycle could be treated as the same as cycling to failure for
reliability determinations.
For that reason, I suspect you can find the answers to your questions in
MIL-HDBK-001. Look at the reliability calculation methods outlined
(about) from page 24 through 50 in there.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Marcel van den Berk
Sent: Thursday, October 13, 2005 7:43 AM
To: [log in to unmask]
Subject: [TN] solderjoint reliability
Hello Guys,
Is there some one who can help me with my reliability question :
We have a board with 15 throughhole NTC components with a constant load
of 6 amps. The operating temperature of the NTC is about 180degrees
Celcius measured with a thermal camera on the comp body. The temperature
on the solder joint is about 100 - 120 degrees Celcius, also measured
with a thermal camera.
Questions:
1) What is the maximum operating temperature on a solder joints for a
reliable contact ? so there is no degradation of the solder joint after
a long periode of time (10years)
2) Is there some literature where i can find some answers on this
question? IPC doesn't say anything about this... or i'm wrong?
Best Regards,
------------------------------------------------------------------------
----
Marcel van den Berk
DFM Support / PCB Technology / Board layout Electronic
DEVelopment------------PRoduction Standards group
A.S.M.L.
De Run 6665
p.o.box 324
5504 DT Veldhoven
The Netherlands
E-mail: [log in to unmask]
Internet: http://www.asml.com <http://www.asml.com/>
------------------------------------------------------------------------
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