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August 2003

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Fri, 29 Aug 2003 08:54:50 -0400
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Omega meter reading until it stablized.  Define the residue using LC
extraction and find out where it come from (a lot of work).  Eliminate
as much as possible by either oxidation or others and do a omega meter
again... It should stablize within few minutes.... At very low level
;-).  Do a SIR test using NPL coupon at the pitch you intended use (or
smaller with short time interval monitoring).....Assume you are going to
do glob top after that....another story.... Happy COB.  Good luck.
(good board house will help you a lot... few years ago, I post on
TechNet request for SIR coupon maker, 3 replied, 2 will comply with
test).  COB is not everybody cup of tea (or can of dew)...

jk


>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Taylor, Ralph W
>Sent: Friday, August 29, 2003 8:39 AM
>To: [log in to unmask]
>Subject: [TN] Aluminum Wire bond COB PWB cleanliness
>
>
>Any recommendations for cleanliness testing for acceptance of
>gold plated PWB's intended for Chip On Board applications
>using aluminum wire wire bonding? Ralph W. Taylor Lockheed
>Martin Maritime Systems & Sensors Moorestown N.J.
>Tele: 856-722-2639  Fax: 856-722-4410
>[log in to unmask]
>
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