Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!ogicse!milton!whit
From: whit@milton.u.washington.edu (John Whitmore)
Newsgroups: sci.electronics
Subject: Re: HP Spectrum Analyzer 8558B Part Question
Message-ID: <7971@milton.u.washington.edu>
Date: 22 Sep 90 02:08:29 GMT
References: <4574@qip.UUCP> <7899@milton.u.washington.edu> <4615@qip.UUCP>
Organization: University of Washington, Seattle
Lines: 38

In article <4615@qip.UUCP> john@qip.UUCP (John Moore) writes:

>Does a Schottky diode have a .34 Volt forward voltage drop (in a
>diode tester)? I tested the surviving diode and that's what I found.
>My Schottky diodes that I have in stock have a significantly higher
>voltage drop.

	Without knowing the test current, I couldn't say; all
Si diodes have about the same forward voltage drop, but Schottky
diodes are half-Si, half-metal, and there's a large variation
in the metals used.
	HP's 5082-2800 has Vf of 0.34 V at about 0.5 mA, according to
the data sheet, so the number looks about right.

 Part number      Matched pair           Vf at 1 mA

 5082-2800        5082-2804              0.40
 5082-2810        NA                     0.39
 5082-2301        5082-2306              0.36
 5082-2303        5082-2308              0.36
 5082-2811        5082-2815 (quad)       0.37

 5082-2835        5082-2080 (batch)      0.30
 5082-2200        5082-2201 (batch)      0.22
 5082-2520        5082-2521              0.36

 5082-2817        5082-2818              0.36
 5082-2400        5082-2401              0.36
 5082-2350        5082-2351              0.36

	Those last three are specified for noise figure at 2.0 GHz;
from the looks of it, they are your most likely candidates.
The packages should be glass, wires .015 +/- .001 inch diameter,
glass diameter .072+/-.004 inch, glass length .160 +/- .010 inch.

	All Vf's are approximate (read from small 'typical' graphs).
The '-2351' pair runs about half a decabuck.

		John Whitmore