Voltage regulator ID

[David M]

Hi,

I need a bit of help with the identification of the following voltage
regulator.

It's on the circuit board of a Rainmatic 3000 irrigation controller -
which I don't have schematic for.

From screen printing on the circuit board and checking with my DMM, I
have the following:

Package type looks like a TO-252 or similar
(approx 6mm 0.25in square)

(In fixed pitch font - top view)

-------
| | ---- Gnd
| 0 | ---- In (also connected to die/heatsink)
| | ---- Out
-------

Most of the markings on the front are illegible, can see 31 somewhere.

I've tried looking at the LM117/317 but the pinouts are wrong.

Voltage in is 6 volts - Vout is current 0v (hence why I need to fix
this !).


Can anyone shed any more light on this part please.

Regards

David M

 

[Franc Zabkar]

On Thu, 26 Aug 2004 11:41:52 +1200, David M
<news_NO@SPAM_moorhouse.net.nz> put finger to keyboard and composed:

Hi,

I need a bit of help with the identification of the following voltage
regulator.

It's on the circuit board of a Rainmatic 3000 irrigation controller -
which I don't have schematic for.

From screen printing on the circuit board and checking with my DMM, I
have the following:

Package type looks like a TO-252 or similar
(approx 6mm 0.25in square)

(In fixed pitch font - top view)

-------
| | ---- Gnd
| 0 | ---- In (also connected to die/heatsink)
| | ---- Out
-------

Most of the markings on the front are illegible, can see 31 somewhere.

I've tried looking at the LM117/317 but the pinouts are wrong.

Voltage in is 6 volts - Vout is current 0v (hence why I need to fix
this !).

Does it look like this?
http://www.nteinc.com/graphics/diag59b.gif

If so, then it could be one of Sanken's SIxxxx series of 3-terminal
regulators, eg SI-3062V.

See http://www.allegromicro.com/skncatlg/regulator/regulator.pdf

If you can't find the SI-3062, then get an SI-3052, lift the ground
pin, and boost it with resistors in the same way as for an adjustable
regulator.


- Franc Zabkar
--
Please remove one 's' from my address when replying by email.

 

[David M]

On Fri, 27 Aug 2004 07:40:24 +1000, Franc Zabkar
<fzabkar@optussnet.com.au> wrote:

On Thu, 26 Aug 2004 11:41:52 +1200, David M
news_NO@SPAM_moorhouse.net.nz> put finger to keyboard and composed:

Hi,

I need a bit of help with the identification of the following voltage
regulator.

It's on the circuit board of a Rainmatic 3000 irrigation controller -
which I don't have schematic for.

From screen printing on the circuit board and checking with my DMM, I
have the following:

Package type looks like a TO-252 or similar
(approx 6mm 0.25in square)

(In fixed pitch font - top view)

-------
| | ---- Gnd
| 0 | ---- In (also connected to die/heatsink)
| | ---- Out
-------

Most of the markings on the front are illegible, can see 31 somewhere.

I've tried looking at the LM117/317 but the pinouts are wrong.

Voltage in is 6 volts - Vout is current 0v (hence why I need to fix
this !).

Does it look like this?
http://www.nteinc.com/graphics/diag59b.gif

No, this package is too big. The one I've got is only 6mm (0.25in)

square with a very small tab (heatsink) at the top which is soldered
to a copper pad on the board. The tab is connected to the centre
(input) pin.

If so, then it could be one of Sanken's SIxxxx series of 3-terminal
regulators, eg SI-3062V.

See http://www.allegromicro.com/skncatlg/regulator/regulator.pdf

If you can't find the SI-3062, then get an SI-3052, lift the ground
pin, and boost it with resistors in the same way as for an adjustable
regulator.


I might just try to replace it with a 7805, I've got the room on the

PCB to change the mounting.

Thanks for your suggestions.

David

 

[Franc Zabkar]

On Sat, 28 Aug 2004 14:28:31 +1200, David M
<news_NO@SPAM_moorhouse.net.nz> put finger to keyboard and composed:

On Fri, 27 Aug 2004 07:40:24 +1000, Franc Zabkar
fzabkar@optussnet.com.au> wrote:

On Thu, 26 Aug 2004 11:41:52 +1200, David M
news_NO@SPAM_moorhouse.net.nz> put finger to keyboard and composed:

Hi,

I need a bit of help with the identification of the following voltage
regulator.

It's on the circuit board of a Rainmatic 3000 irrigation controller -
which I don't have schematic for.

From screen printing on the circuit board and checking with my DMM, I
have the following:

Package type looks like a TO-252 or similar
(approx 6mm 0.25in square)

(In fixed pitch font - top view)

-------
| | ---- Gnd
| 0 | ---- In (also connected to die/heatsink)
| | ---- Out
-------

Most of the markings on the front are illegible, can see 31 somewhere.

I've tried looking at the LM117/317 but the pinouts are wrong.

Voltage in is 6 volts - Vout is current 0v (hence why I need to fix
this !).

Does it look like this?
http://www.nteinc.com/graphics/diag59b.gif

No, this package is too big. The one I've got is only 6mm (0.25in)

Sorry, I was too concerned with matching the pinout to notice the size
difference.

square with a very small tab (heatsink) at the top which is soldered
to a copper pad on the board. The tab is connected to the centre
(input) pin.


If so, then it could be one of Sanken's SIxxxx series of 3-terminal
regulators, eg SI-3062V.

See http://www.allegromicro.com/skncatlg/regulator/regulator.pdf

If you can't find the SI-3062, then get an SI-3052, lift the ground
pin, and boost it with resistors in the same way as for an adjustable
regulator.


I might just try to replace it with a 7805, I've got the room on the
PCB to change the mounting.

You should be able to find a 7806 without too much trouble.


- Franc Zabkar
--
Please remove one 's' from my address when replying by email.