Re: gEDA-user: TO-92 Best Practices

[Greg Cunningham <greg@xxxxxxxxxxxxxxxxxxxx>]

On Tue, 2010-03-02 at 21:21 -0800, Donald Tillman wrote:
> On Mar 2, 2010, at 2:35 AM, Peter TB Brett wrote:
> 
> > The usual approach is to buy SMT packages containing 2 or 4  
> > transistors on
> > a single piece of silicon (i.e. literally back-to-back on the wafer).
> > They're invariably well-matched enough for all but the most ultra- 
> > precise
> > applications, in my experience.
> 
> 
> Which dual/quad transistors are these?  Who makes them?
> 
> (And back-to-back?  Are you sure?  That doesn't sound right.  That  
> would have to involve separate processes for each side, and so the  
> transistors wouldn't be matched.)
> 
> Most dual transistors I've seen have the transistors on separate  
> dies.  And so there's no matching and no offset spec; it's just like  
> picking up 2 or 4 individual transistors.
> 
>    -- Don
> 
> --
> Don Tillman
> Palo Alto, California
> don@xxxxxxxx
> http://www.till.com
> 
> 
> 
> 
> 
> 
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...me thinks Pete had a long-tail-pair schematic in his head at the
time.  Probably meant side-by-side on the die.
-- 
Greg



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