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May 1998

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Subject:
From:
"Lolmaugh, Scott (AZ15)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 13 May 1998 09:15:14 -0500
Content-Type:
text/plain
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text/plain (96 lines)
All,
There was an interesting article in the February issue of SMT Magazine
(IHS Publishing Group) on page 56, entitled: "End Paste Defects with
Solid Solder Deposits".  This is a technique where the PWB Manufacturer
applies solder to the board, then runs the boards through polished
rollers to flatten the solder coating into a flat surface roughly the
same height as the soldermask.  Then a tacky flux is applied and finally
an easy peel cover sheet.  They claim the boards retain solderability
well and the paste stencil process is eliminated.

There have been similar / identical techniques touted in the past, known
as:
"Sipad" (R) Siemens AG, (solderpaste application method)
"Optipad" (R) Viele Circuits Inc. and Burkle USA, (liquid solder
application method) and
"Precision Pad Technology or PPT (R) Mask Technology Inc. (solderpaste
application w/ textured finish)

If anyone knows of domestic (USA) Manufacturers offering this technology,
I'd like to hear who they are.
Thanks
Best Regards,
Scott Lolmaugh
SMT Production Engineering
Honeywell IAC, Inc.
602.313.3551 /FAX: 3402 (Please call first)


 -----Original Message-----
From: [log in to unmask]
Sent: Wednesday, May 13, 1998 8:39 AM
To: [log in to unmask]
Subject: [TN] HASL alternatives

To All,
We are now making a comparison between different alternatives to HASL.
The
chosen alternative will have to meet the following criterias criterias.

 - flat coating
 - compatible with No-clean process and mixed technology
 - resistant to 2-3 reflow (multiple heat cycle)
 -and MINIMUM 1 year shelf life (storage before assembly)

These are the alternatives we think can meet our needs:

* OSP
        - Benzimidazole (?)

* IMMERSION
        - Silver
        - Bismuth
        - Au-Ni
        - Palladium


Q: Wich one do you think could be the best meet to our criterias ?

Q: And what would be its advantage(s) compared to the others ?

Q:  OTHERS  ? (is anyone using other coating alternative )


Thanks for all for your help


Nicolas van der Heyden

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