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July 2000

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Subject:
From:
"McMonagle, Mike" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 21 Jul 2000 11:41:53 -0400
Content-Type:
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                Bev,
1)      Usually with integral standoffs (bumps) on the package itself.
2)      For visual inspection of topside wetting, prevention of lead shorts
to metal case devices, potential damage from solder contact to component
body.
3)      Gross visual inspection, go/no go gages if extremely picky.

                As stated in 5.2.6, this is the Target condition. Process
Indicator can be less (down to completely flush to board) or more, just as
long as minimum electrical clearances aren't violated....

                Mike McMonagle
                Senior SMT Engineer
                Telxon Corporation
                http://www.telxon.com <http://www.telxon.com>


                                -----Original Message-----
                                From:   Bev Christian
[mailto:[log in to unmask]]
                                Sent:   Friday, July 21, 2000 7:52 AM
                                To:     [log in to unmask]
                                Subject:        [TN] Mounting- Vertical -
Radial Leaded

                                Here's an easy one.  Page 5-12 of IPC-A-610C
shows radial PTH components
                                with a standoff between the component base
and the board.  1) How do you all
                                meet this requirement?  2) What is the
purpose of it? 3) How do you
                                inspection for it?
                                 My guesses:
                                1) lead forming, soluble plastic disks or
tubing, friction fit, by chance,
                                don't
                                2) heat dissipation, inspection, strain on
solder joint
                                3) eye, thickness gauge, don't

                                I await your sage comments, oh wise ones.

                                regards,

                                Bev Christian
                                XLTEK


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