Re: gEDA-user: TO-92 Best Practices

[Donald Tillman <don@xxxxxxxx>]

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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