On Jul 18, 2010, at 12:24 PM, Oli Glaser wrote:

> I have added a large pitch alternative
> pattern in the library. I increased the (thinnest part of)annular  
> ring from
> 0.05mm (!! a lot of PCB houses don't do this low AFAIK) to 0.15mm and
> increased the pin spacing from 1.2mm to 1.5mm, giving a 0.5mm  
> clearance. The
> maximum pin spacing according to the datasheet is 1.4mm

You might want to check your actual transistors.  Many of the TO-92  
like packages I've been seeing have the leads pre-formed to an in-line  
footprint with 2.5mm pin spacing (which leaves plenty of room for LOTS  
of clearance.)   I don't think I've ever seen a PCB footprint that  
matches the actual lead-spacing AT the TO92 case...

BillW


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