HPQSCH1691 Zener diode info?
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From: N Cook on 16 May 2007 15:04 0.4W zener but what voltage?
From: N Cook on 16 May 2007 17:05 N Cook <diverse8(a)gazeta.pl> wrote in message news:f2fkhs$mvu$1(a)inews.gazeta.pl... > 0.4W zener but what voltage? > > > > > > probably a Schottky, not a zener, 70V reverse, 1mA
From: Franc Zabkar on 17 May 2007 01:40 On Wed, 16 May 2007 20:04:30 +0100, "N Cook" <diverse8(a)gazeta.pl> put finger to keyboard and composed: >0.4W zener but what voltage? 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 -- Please remove one 'i' from my address when replying by email.
From: N Cook on 17 May 2007 02:54 Franc Zabkar <fzabkar(a)iinternode.on.net> wrote in message news:meqn43lnf46gmtr4idegoi0mudg011sluf(a)4ax.com... > On Wed, 16 May 2007 20:04:30 +0100, "N Cook" <diverse8(a)gazeta.pl> put > finger to keyboard and composed: > > >0.4W zener but what voltage? > > 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 > -- > Please remove one 'i' from my address when replying by email. 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 http://home.graffiti.net/diverse:graffiti.net/
From: Michael A. Terrell on 17 May 2007 10:02
N Cook wrote: > > 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. It doesn't work, because there is nothing to find. > 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. 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. http://www.avagotech.com/ -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida |