HPQSCH1691 Zener diode info?

probably a Schottky, not a zener, 70V reverse, 1mA

On Wed, 16 May 2007 20:04:30 +0100, "N Cook" put finger to keyboard and composed:

I can't help, but FWIW, the Internet has references to "QSCH" devices made by HP.

HP also has a lot of diode parts of the type HSCH-xxxx or HSCHxxxx.

The "SCH" in the part number seems to suggest a Schottky diode.

- Franc Zabkar

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I looked on hp.com but because of an extension to Moore's law or something, HP being a computer company, Firefox does not work with the hp.com search box. So using quasi-advanced Google search "qsch site:hp.com" turned up nothing. The schematic showed a zener symbol, but I later found the relevant parts list page, and so reason for .35V diode-test diode drop. I'd never come across 1N4148 type packaged schottkys before.

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

It doesn't work, because there is nothing to find.

HP spun off their semiconductor division years ago, when they did the same to their test equipment division:

1999

HP's board of directors announces its decision to spin off a new company from the existing HP organization. Agilent Technologies consists of HP's former measurement, components, chemical analysis and medical businesses. HP retains its computing, printing and imaging businesses. Agilent has its initial public offering of common stock on November 18,

1999. HP retains 84.1 percent of common stock. It is Silicon Valley's largest-ever IPO.

In 2005 they changed the semiconductor company name to Avago.

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