Hello Jan and all
To appreciate the wording of 2KA you might need to dig back a little further
in the specs to DoD-2K, Volume 2, Page 42 where DIP devices were restricted
from any "clinch" at all. Leads were required to be "bent" outward less than
30 degrees. This concern was a result of failures due to component delidding
caused by an inward lead clinch. In addition there were the issues of
complication for rework and lead finish cracking that hindered
solderability.

The wording selection for 2KA "bent" outward was intentional to discourage
aggressive clinches for DIP device leads and thereby not contributing to the
previous issue with component delidding. Obviously the greater number of
leads deflected, the greater the possibility of component damage as well as
the other issues mentioned above.

Mel Parrish
201 Cedar Road
Mullica Hill, NJ 08062-2503
856 223 5828
[log in to unmask]

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Jan Satterfield
Sent: Thursday, June 01, 2000 2:34 PM
To: [log in to unmask]
Subject: Re: [TN] MIL-2000A DIP lead clinch requirement?


Yes, you read it correctly.  Section 4.1 does not imply that all leads must
be clinched, but if they are clinched then they must meet the requirements
of 4.1.

> -----Original Message-----
> From: Mike Sewell [SMTP:[log in to unmask]]
> Sent: Thursday, June 01, 2000 8:42 AM
> To:   [log in to unmask]
> Subject:      [TN] MIL-2000A DIP lead clinch requirement?
>
> Morning all,
>
> Interpretation of 2000A requirements for DIP lead clinching after
> installation...
>
> 40.1.1 restricts fully clinched leads for DIP and full or partial for
> tempered pins or leads over 1.3mm dia.
>
> 40.1.2 states bends shall be outward.  If manual clinching is used, only
> corner leads of DIPs may be clinched.
>
> 40.1.3 component leads terminated straight through shall be discernable
> and
> may extend a maximun of 1.5mm above the termination area.
>
> Does this read as 1) if you're going to clinch a DIP - don't fully clinch.
> 2)
> if you're going to clinch a DIP - partial clinch outward, and only the
> corner
> leads if done manually 3) If you're not going to partial clinch - then
> just
> meet the lead protrusion requirement?
>
> In general, does 4.1 Lead Terminations. The length of the clinched portion
> of
> wires and component leads .... imply that leads shall be clinched?
>
> Thanks in advance,
> Mike Sewell
>
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