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From: Robbie Hatley on 5 Aug 2010 15:24

Greetings, group. I'm repairing some boards that have a small voltage
regulator in one corner (designated "VR1"), TO-92 package (like a
typical small signal transistor) which I'm having trouble identifying.

The device is marked like this:

SiLA
8
XXXX

(where XXXX is a 4-digit hexidecimal date or batch code, varying
between devices, wheras "SiLA" and "8" are always the same)

First off, anyone know what manufacturer has logo "SiLA"? I can't find info
on this.

Secondly, how in hell can I trace a part with part number "8"???
Come on, mfg.... "8"??? "8"??? Surely you guys can think of a more
unique part number than just "8"??? Sigh. Maybe it's supposed to be
an 8V regulator? Seems to be putting out about 20V, though.

Could be something like a 78LXX, but may be completely different.
Pin 1 is connected to what I'll call A+ (100-300VDC). Pin 2 seems
to be the output. Pin 3 is connected to the center point of a resistive
voltage divider from Pin 2 to ground (Vref?). When powered up
on test bench I'm getting V(pin1)=200VDC, V(pin2)=18VDC,
V(pin3)=20VDC. Might be a 20V regulator.

Anyone have any clues what this is? (I need to buy some, because
these seem to burn out frequently on these boards.)

--
Cheers,
Robbie Hatley
hatley [[dot]] software [[at]] gmail [[dot]] com





From: Meat Plow on 5 Aug 2010 15:48
On Thu, 05 Aug 2010 12:24:25 -0700, Robbie Hatley wrote:

> Greetings, group. I'm repairing some boards that have a small voltage
> regulator in one corner (designated "VR1"), TO-92 package (like a
> typical small signal transistor) which I'm having trouble identifying.
>
> The device is marked like this:
>
> SiLA
> 8
> XXXX
>
> (where XXXX is a 4-digit hexidecimal date or batch code, varying between
> devices, wheras "SiLA" and "8" are always the same)
>
> First off, anyone know what manufacturer has logo "SiLA"? I can't find
> info on this.
>
> Secondly, how in hell can I trace a part with part number "8"??? Come
> on, mfg.... "8"??? "8"??? Surely you guys can think of a more unique
> part number than just "8"??? Sigh. Maybe it's supposed to be an 8V
> regulator? Seems to be putting out about 20V, though.
>
> Could be something like a 78LXX, but may be completely different. Pin 1
> is connected to what I'll call A+ (100-300VDC). Pin 2 seems to be the
> output. Pin 3 is connected to the center point of a resistive voltage
> divider from Pin 2 to ground (Vref?). When powered up on test bench I'm
> getting V(pin1)=200VDC, V(pin2)=18VDC, V(pin3)=20VDC. Might be a 20V
> regulator.
>
> Anyone have any clues what this is? (I need to buy some, because these
> seem to burn out frequently on these boards.)

Try researching under the name Silan Microeletronics.



--
Live Fast, Die Young and Leave a Pretty Corpse
From: Robbie Hatley on 5 Aug 2010 19:56

Regarding my query about the TO-92 voltage regulator marked "SiLA/8/XXXX",
"Meat Plow" <mhywatt(a)yahoo.com> said, "Try researching under the name
Silan Microeletronics". Thanks for the tip; however, I note that the Silan
Microelectronics logo given by the sites I've looked at so far are all
"script 'SL' in tilted ellipse", rather than "SiLA". Something tells me that
"SiLA" may be the logo of some other company. An alluring match of first 4
letters though; I'll look into it further to make sure.

--
Cheers,
Robbie Hatley



From: Michael A. Terrell on 5 Aug 2010 20:17

Robbie Hatley wrote:
>
> Regarding my query about the TO-92 voltage regulator marked "SiLA/8/XXXX",
> "Meat Plow" <mhywatt(a)yahoo.com> said, "Try researching under the name
> Silan Microeletronics". Thanks for the tip; however, I note that the Silan
> Microelectronics logo given by the sites I've looked at so far are all
> "script 'SL' in tilted ellipse", rather than "SiLA". Something tells me that
> "SiLA" may be the logo of some other company. An alluring match of first 4
> letters though; I'll look into it further to make sure.


Are any of the regulators working? They may be in shutdown mode,
from another problem. If they are three pin it shouldn't be hard to
find the input and ground. Unsolder the remaining terminal and read the
voltage.
From: Meat Plow on 6 Aug 2010 10:37
On Thu, 05 Aug 2010 16:56:33 -0700, Robbie Hatley wrote:

> Regarding my query about the TO-92 voltage regulator marked
> "SiLA/8/XXXX", "Meat Plow" <mhywatt(a)yahoo.com> said, "Try researching
> under the name Silan Microeletronics". Thanks for the tip; however, I
> note that the Silan Microelectronics logo given by the sites I've looked
> at so far are all "script 'SL' in tilted ellipse", rather than "SiLA".
> Something tells me that "SiLA" may be the logo of some other company.
> An alluring match of first 4 letters though; I'll look into it further
> to make sure.

Well it was just a suggestion and seemed reasonable to investigate
further. Why not match something up just be electrical specs? If you have
a working device to get some voltage references from I don't see a problem
with specing it out to another vendor. And since you are seeing high
failure rate, overspec it.



--
Live Fast, Die Young and Leave a Pretty Corpse
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