Look in IPC-D-275.  There is a section on fastening these kind of parts with
over 3 grams.  Section 4.1.8.2, I think is the section.  Hope this helps!

> ----------
> From:         Donald Cole[SMTP:[log in to unmask]]
> Sent:         Thursday, December 10, 1998 1:33 PM
> To:   [log in to unmask]
> Subject:      [TN] Mechanical Fastening of "heavy" components
>
> Hi all,
> I am wondering if anyone can help me out!  I am trying to find any
> reference to a specification which states when a component is of a
> certain mass, it needs to be fastened to the PCB by other means than its
> solder joints (i.e. adhesive or mechanical fastening).  I know the old
> MIL-STD-2000A specification did state that if a component is 0.25 ounce
> (7.1 grams) or more per lead than it must be supported by approved means
> to ensure joints are not relied upon for mechanical support.  I am being
> told that a similar clause exists in either the IPC (ANSI/J-STD-001B or
> ANSI/IPC-A-610) standards or BellCore GR-78-CORE.  I have search these
> and cannot seem to find any reference to this.  Am I missing something,
> or does such a clause exist somewhere else?  The specific case I have is
> a DC-DC power converter which weighs 3 oz. (85 grams) and has 9 thru
> hole leads (0.040" dia.).  We currently work to Bellcore and IPC
> specifications.  Is there a requirement to fasten this power converter
> to the PCB with screws?  Any input would be greatly appreciated.
>
> Thanks
> dc
>
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