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

---------------------------------------------------------------------------------

Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt delivery of Technet send e-mail to [log in to unmask]:
SET Technet NOMAIL
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search previous postings at: www.ipc.org > On-Line Resources & Databases >
E-mail Archives
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700
ext.5315
---------------------------------------------------------------------------------















         * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *



 The   information  contained  in  this message is  legally  privileged and
 confidential   information  intended  only   for the use of  the addressed
 individual   or  entity   indicated  in this  message (or  responsible for
 delivery   of  the  message to such person).  It must not be read, copied,
 disclosed,  distributed  or  used  by any person other than the addressee.
 Unauthorised  use, disclosure or copying is strictly prohibited and may be
 unlawful.

 Opinions, conclusions  and other information on  this message  that do not
 relate  to  the  official business of  any of the constituent companies of
 the  SANMAR GROUP  shall  be  understood as  neither given nor endorsed by
 the Group.

 If  you   have  received  this  message in error,  you should destroy this
 message and kindly notify the sender by e-mail.

 Thank you.

         * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------