Replacement for QP1008 (HP9816 PSU)

[Rik]

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.
>
>
>