15 Apr
2008
15 Apr
'08
1:43 a.m.
Based on the specs placed on the board 5V/6A +14/1.6A -14/0.5A and a assumed
~80% efficiency, simple power calculation give (30W + 22,4W + 7W)/0.8 =
74,25 say 75-80W.
So I think I'll use one of the supposed replacements.
Rik
----- Original Message -----
From: "Brent Hilpert" <hilpert at cs.ubc.ca>
To: <General at priv-edtnaa03.telusplanet.net>;
"Discussion at priv-edtnaa03.telusplanet.net :On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Sent: Tuesday, April 15, 2008 11:05 AM
Subject: Re: Replacement for QP1008 (HP9816 PSU)
Rik wrote:
Sorry, I need to replace both and ment that the 2n2222 isn't a problem,
but
the QP1008 is.
The PSU isn't build by HP but by RTE POWER/MATE a firm with doesn't exist
any more.
The text on the QP1008 (TO3) is QP1008 and the date stamp 8413 and the
Motorola sign.
I do have a Motorola component cataloge from '83 but can't find the part
in
there and in my other books.
On the schematics of Tony the part is mentioned as QP1008
http://www.hpmuseum.net/document.php?hwfile=4020
I need to know witch transistor I can use to replace it.
A line of speculation, FWIW:
1. Looking through the cross-refs of the 1984 Moto Bipolar Power
Transistor and
Thyristor databook, the only part I spot with a number portion of 1008 is
UMT1008. Yes, that's a speculative and questionable association in-and-of
itself, but sometimes house or custom-request numbers bear some
inheritance
from the common part number.
2. The "Motorola Similar Replacement" for UMT1008 is MJ13014.
3. Basic specs on the MJ13014:
"Switchmode Series NPN Silicon Power Transistor"
"..designed for high-voltage, high-speed, power-switching in inductive
circuits where fall-time is critical.."
"..particularly suited for switchmode applications such as: switching
regulators, inverters.. [etc]"
TO-3 package
VCEO: 350V
IC: 10A
Pd @ 25C: 150W
hfe: 12 min
60nS inductive fall time @ 25C
800nS inductive storage time @ 25C
Perhaps Moto was asked to supply something that
looked-like/similar-to/spec'ed-version-of a UMT1008.
The basic specs would suggest it passes a sniff test, but I'm not familiar
with
the actual power supply so I'll leave it to others to perhaps comment on
applicability in the specific.