[Amps] Semtech diode

[Steve Katz]

The P/N is a mere coincidence.  Semtech issued all SA numbers sequentially, beginning with SA-0001 and going into the several thousands.

A string of 1N5408s, if they are very good ones (metalurgically bonded with large dice), should work.   Semtech used .125" diameter round dice for this family, they have more silicon in them than conventional 1N54xx, and the Semtech parts were all dual-plug metalurgically bonded capable of withstanding very high surges.

-WB2WIK/6



-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com]On
Behalf Of sccook1 at cox.net
Sent: Monday, October 27, 2008 12:19 PM
To: amps at contesting.com; john.brewer at us.schneider-electric.com
Subject: Re: [Amps] Semtech diode


If Henry does not have it and you can't find one after market, you could build your own adjustable bias device using a string of 1N5408 or simular diodes.  See Rich Measures' web page or Google AG6K for more info.

FYI -- a 1N5534 is a 14V Zener diode, albeit, only rated for 0.4W.  I am not sure what the Semtech device was rated at, but it is curious that the standard series for Zeners contains a listing in the voltage range that might serve as a bias element.  

Cheers,

-S




---- john.brewer at us.schneider-electric.com wrote: 
> 
> >From the AMPS archives
> 
> "I'm not sure what this is all about, but the Semtech diode string used 3A
> diodes internally, having Vf = 1V/cell @ 3A and about .8V/cell at 1A, so
> there were a variety made using different qtys of cells.  I recall Henry
> used these for their inherantly high surge current capability (150Apk, 8.3mS
> rating), but that wasn't the only reason.  The other reason was that at the
> time, Semtech didn't make any high powered Zeners, and the Semtech salesman
> was good friends with the people at Henry, so they give him the business.
> The salesman is quite a famous 20m DXer, Mel, W6FDR (ex-WB6FDR).  I recall
> all this because at the time, I also worked for Semtech.
> 
> -WB2WIK/"
> 
> 
> 
> ----------------------------------------------------------------------
> 
> > Hello all, I am in need of the Biasing Diode in a 2KD-5 I have researched the original part #
> with no luck it is a Semtech SA-5534 I would like to keep it original but I could use a stud
> mount Zener or use a pass transistor with a lower wattage diode. Am I grasping at straws
> looking for the original? Thanks
> >
> 
> 73
> John K5MO (good stuff in those archives)
> 
> 
> 
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