check jedec standard for components dwg package.  plus your stencil  
paste height after reflow.
On Nov 9, 2015, at 2:09 PM, Stadem, Richard D. wrote:

> That would be in the component drawing from the vendor.
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
> Sent: Monday, November 09, 2015 12:51 PM
> To: [log in to unmask]
> Subject: [TN] IPC SMT Lead to package co-planarity
>
> Fellow TechNetters:
>
>    In which IPC STD will I find information of distance between the  
> plastic housing standoff and lead height.   INMHO the standoff  
> should rest on the solder mask surface while the lead should have a  
> slight gap to rest on the PWB copper pads.   I hope that this makes  
> sense.   A print/spec is not readily available.
>
> Victor,
>
>
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