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Reply To: | TechNet E-Mail Forum. |
Date: | Tue, 19 Feb 2002 11:36:08 +0530 |
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Dear Antonio,
An easy and simple way of determining the Reliability of a PTH (double-side
or multilayer) is to carry out a
Thermal Stress test on A/B Coupons integrated in the design as a part of
the panel outside the circuit area.
The coupon has to be cut out from the panel after PCB PROCESS Completion
without mechanical stress and coupon
cured for 1 hour at 120 deg C.
The specimen has to be cooled to room temperature under normal room
temperature conditions.
A mould has to be prepared with appropriate grinding and polishing for
metallographic inspection under a Stereo
Microscope having at least 50 magnification with illumination. If there
are no barrel cracks/discontinuity between
inner layers and barrel and also at the knee, then the PTH is supposed to
be reliable. If the Coupon specimen
can withstand higher cycles of thermal stress (>3) without any problems
the reliability is inferred to be high.
Regards,
M A Ranganath
GM - Engineering & Quality
Sanmar Micropack Limited
Plot No.16, Jigani Industrial Area,
Bangalore - 562 106. INDIA
Phone: 91 - 80 - 7825223/224/226/389
Fax : 91 - 80 - 7825225
Email : [log in to unmask]
Antonio Souza
<[log in to unmask] To: [log in to unmask]
INPE.BR>< > cc:
Sent by: Subject: [TN] Reliability Testing of PTH
TechNet
<[log in to unmask]
ORG>
02/18/02
05:49 PM
Please
respond to
"TechNet
E-Mail
Forum.";
Please
respond to
Antonio Souza
Please
Does anybody know any Guidelines for Accelerated Reliability Testing of PTH
?
thanks
Antonio
INPE-Brasil
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