Giese,

We have successfully integrated PTH (Pin Thru Hole) connectors that are high
temp in our reflow process of cards which have SMT for all the other components.
D-shell, headers, and snap-in SIMMs connectors are included in the mix.   The
smaller sized headers are automatically placed, and the balance are manually
placed prior to reflow.  We use our standard no-clean paste for the application,
with larger deposits around the PTH pads to provide sufficient solder.  There is
additional maintenance one can expect due to paste dropping in the oven, as well
as in equipment prior to reflow.  Defect reduction has been tremendous due to
alleviation of the opportunity for solder bridges in the wave solder process.

Mary Smoot
Process Engineer
Lexmark Electronics
H95A/002-1
740 New Circle Rd NW
Lexington, KY 40550
606-232-6687



Giese Klaus <[log in to unmask]> on 09/25/98
11:34:39 AM

Please respond to "TechNet E-Mail Forum."
      <[log in to unmask]>; Please respond to Giese Klaus
      <[log in to unmask]>

To:   [log in to unmask]
cc:    (bcc: Mary Smoot/Lex/Lexmark)
Subject:  [TN] SMT Connectors




Fellow Technetters,

with a lot of effort we turned 98 % of our designs to SMT. Only a few
components, mostly connectors are left.
Who can recommend companies who have:
- a very good selection of SMT connectors,
- experience in turning THT stuff into SMT or
- have gone the extra mile to make THT components work in Reflow.

Thanks in advance

Klaus Giese

Siemens AG, Karlsruhe - Germany

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