Not exactly true, but perhaps only a technicality, the IPC-A-610 was
developed by an the IPC Product Assurance Committee and was published
before the J-STD-001. J-STD-001 represents work of the IPC Assembly and
Joining Committee. While the two documents were developed on two
different paths the IPC has requested that the committees reach a
consensus and harmonize the end item acceptance criteria. They are
different standards and the one is not merely a picture book clarifying
requirements of the other.

You are correct in stating that user approved drawings have higher order
of precedence over the requirements of either standard. Procurement
agreements take precedence over user approved assembly drawings.

> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Barry Gallegos
> Sent: Thursday, October 31, 2002 9:26 AM
> To: [log in to unmask]
> Subject: Re: [TN] Lead protrusion
>
>
> It would be my understanding that all customer drawings are
> requirements That overrule IPC/J-std. IPC-A-610 is merely a
> pictorial document that is derived from J-STD. With other
> areas not covered such as cleanliness req. or Markings etc. I
> believe that I would move create a deviation for those
> devices and still follow Class III in all other areas as long
> as you say that I would not violate and
>
> Electrical clearance issues.
>
> Of course, all have their own interpretations.
>
> Barry.
>
>
>  -----Original Message-----
> From:   Marsico, James [mailto:[log in to unmask]]
> Sent:   Thursday, October 31, 2002 6:41 AM
> To:     [log in to unmask]
> Subject:        Re: [TN] Lead protrusion
>
> Correct me if I'm wrong, but I thought that the drawing only
> overrules the spec (J-STD-001) only when it is approved by
> the customer.
>
> Jim Marsico
> Senior Engineer
> Production Engineering
> EDO Electronics Systems Group
> [log in to unmask] <mailto:[log in to unmask]>
> 631-595-5879
>
>
>         -----Original Message-----
>         From:   Graham Collins [SMTP:[log in to unmask]]
>         Sent:   Thursday, October 31, 2002 8:34 AM
>         To:     [log in to unmask]
>         Subject:        Re: [TN] Lead protrusion
>
>         Hi Keith
>         We build some similar stuff.  You have two options
> other than the hand trimming:
>
>         Run the DIP packages through a forming and trimming
> machine, to trim the leads to an acceptable length.  This is
> typically what we do, so we end up with enough lead that the
> CS-400 can crimp it but not too much for protrusion.
>
>         Alternatively - have a drawing note added to increase
> the allowable lead length to 90 thou or whatever is
> reasonable in the applications you have.  The drawing note
> overrules the IPC requirement, so you are in the clear.
>
>
>
>         regards,
>
>         Graham Collins
>         Process Engineer,
>         Northrop Grumman Canada Corporation
>         Halifax
>         (902) 873-2000 ext 6215
>

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