Hi Marv,
The Semtech rectifiers have higher than the usual ".6V" Vf, by design,
because they use what's called a suprataxial junction structure made like a
sandwich, using two slices if silicon per die (not one). Drawback is higher
than typical Vf (compared with epitaxial or double-diffused); advantage is
very low Ir (leakage), especially at elevated junction temperatures. The
Semtech typical rectifier is rated to 175 degrees C Tj (industry standard is
150), and many were rated to 200 degrees C, where ordinary diodes become
intrinsic (short circuits).
-WB2WIK/6
"If everything seems under control, you're just not going fast enough." -
Mario Andretti
> -----Original Message-----
> From: Marv Gonsior [SMTP:w6frmarv@dslextreme.com]
> Sent: Friday, July 19, 2002 2:46 PM
> To: Steve Katz
> Subject: RE: [Amps] Diode Bias Strings
>
> Steve......many thanks for the fill that even makes the proverbial cheese
> more binding. You will see my last post concerning the fact that is was a
>
> 10V unit so .8V is really significant. I assumed the traditional .6V X
> ~18
> devices!!
>
> Marv.
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