9 Feb
2006
9 Feb
'06
5:25 p.m.
Does anyone have, or know of a source of, data on the STK7551?
This is a hybrid circuit, designed to mount onto a heatsink. It's got 16
(or so) connectons on oen edge, which are soldered to the PCB.
What I know :
It's a voltage regulator. It says so on the package. It's used in the
Epson TF20 disk drive power supply, where it outputs +5V and +12V. It's
clearly a dual regulator, and I uspect it's a switcher.
What I would like is at least a pinout, and preferably even more data
(Please don't send anything but plain text to me here, if you've got
images, or pdfs, or something, contact me, and I'll give you an address
to sned them to. Thanks!)
-tony
9 Feb
9 Feb
7:04 p.m.
Tony,
The 7551/7552/7553 are all discontinued, but I believe the replacements are
part of the STK755-xxx series. Here's the datasheet (in Japanese) for the
755-110, which outputs +12 and +5.
Maybe this will help...
Cheers,
Chuck
7:20 p.m.
On 2/9/2006 at 4:04 PM Chuck Guzis wrote:
Here's the datasheet (in Japanese) for the 755-110, which outputs +12 and
+5.
http://www.datasheetarchive.com/semiconductors/download.php?Datasheet=200810
2
7:35 p.m.
Tony,
The 7551/7552/7553 are all discontinued, but I believe the replacements are
That does not suprise me. The Epson TF20 floppy drive (which is where I
came across it) must be at least 20 years old now. Fortunately, all the
chips on the cotnroller board are recognisable (some are almost certainly
discontinued, but common -- rows of 74LSxx TTL, a Z80A, 8 off 4164 DRAMs,
a 2716, a 765 disck controller, etc)
part of the STK755-xxx series. Here's the
datasheet (in Japanese) for the
755-110, which outputs +12 and +5.
Where? Did you forget the URL?
The PSU board in the TF20 contains this hybrid, a bridge
rectifier/smoothing capacitor (takes in 24V AC from a transfromer on the
main chassis), a few smaller capactiors, 4 torroidal inductors (looks to
be an energy storage inductor and a filter for each output), 2 of what
look to be snubber networks (diode, resistor, small capacitor) and a
couple more resistors and a zennr. The last makes me wonder if the output
voltage of the 7551 can be set by external compoennts.
-tony
10 Feb
10 Feb
1:33 p.m.
Does anyone have, or know of a source of, data on the
STK7551?
This is a hybrid circuit, designed to mount onto a heatsink. It's got 16
(or so) connectons on oen edge, which are soldered to the PCB.
What I know :
-Tony
Tony,
I think this date is in japanese semiconductor date format.
Cheers, Wizard
8:48 p.m.
Does anyone have, or know of a source of, data on
the STK7551?
This is a hybrid circuit, designed to mount onto a heatsink. It's got 16
(or so) connectons on oen edge, which are soldered to the PCB.
What I know :
-Tony
Tony,
I think this date is in japanese semiconductor date format.
10:10 p.m.
On 2/11/2006 at 1:48 AM ard at p850ug1.demon.co.uk wrote:
But I also found a data shert on the STK7554 on
digchip. I
couldn't read much of it (I don't read Japanese), but at least the
pinout was in English, and at least some of the pins match up. So that
might be a start.
The Sanyo hybrids are strange devices regarding nomenclature. I had an
STK4541 (no suffix) go toes up on an amplifier here. Scouting around
yeilded sources for an STK4541II and a STK4541V. No clue as to what's
different. I ordered a 4541II, put it in and it works.
Was there an III and IV? No idea--a google finds no mention of them.
But I still don't have a clue--if it'll put in another 16 years, I won't
complain too much.
Cheers,
Chuck
10:42 p.m.
New subject: Need some information on a DEC machine
A friend of mine recently found a DECpc XL 590 and is looking for
information on it. Do DEC manuals for these system exist in PDF format? The
machine appears to be a dual Pentium I machine but only came with a single
P90 in it. Can these be upgraded to Alphas by chance?
11:07 p.m.
New subject: Need some information on a DEC machine
A friend of mine recently found a DECpc XL 590 and is
looking for
information on it. Do DEC manuals for these system exist in PDF format? The
machine appears to be a dual Pentium I machine but only came with a single
P90 in it. Can these be upgraded to Alphas by chance?
Manuals might exist somewhere in PDF format, it's old enough that it
might be on the DEC MDS CD's that used to be online somewhere or
another.
It can't be upgraded to an Alpha.
Zane
--
--
| Zane H. Healy | UNIX Systems Administrator |
| healyzh at aracnet.com (primary) | OpenVMS Enthusiast |
| MONK::HEALYZH (DECnet) | Classic Computer Collector |
+----------------------------------+----------------------------+
| Empire of the Petal Throne and Traveller Role Playing, |
| PDP-10 Emulation and Zane's Computer Museum. |
| http://www.aracnet.com/~healyzh/ |
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