gEDA-user: TO-92 Best Practices

[Donald Tillman <don@xxxxxxxx>]

Hey folks,

What's considered Best Practices for TO-92 packages?

I'm working on a project that involves a lot of discrete transistors  
in TO-92 packages -- the regular style, 3 in-line, no fancy triangular  
pinouts or lead forming or anything.

The TO92 package in pcblib-newlib seems to be larger than necessary,  
in pin spacing, pad size, and hole size.

Pin spacing: The actual package has the pins 50 mils apart. Is this  
used in practice?  Or is it too problematic, and maybe it's more  
practical to just spread the leads a little by hand?  Are there  
machine insertion issues?  (Not that I care right now, but I'd like to  
be as uptown about it as possible.)

The TO-92 leads are 20 mils diameter.   Would a 24 mil hole be fine  
then?  And maybe a 35 mil pad?

Anybody have success (or failure) stories or advice?

  -- Don

--
Don Tillman
Palo Alto, California
don@xxxxxxxx
http://www.till.com






_______________________________________________
geda-user mailing list
geda-user@xxxxxxxxxxxxxx
http://www.seul.org/cgi-bin/mailman/listinfo/geda-user