Fixed Voltage -18v 1.5Amp reg replacement, original is EOL

Any suggestions on a replacement for a L7918CV by ST, it is EOL and none of the usual suspects have any stock.

I can find lot's of 1AMP canidates, but 1.5amp versions are scarce on the ground.

Specs, -18v, 1.5AMP, TO220-3, doV 1.4v, 125 degree C

Datasheet is here

http://www.mouser.com/ds/2/389/stmicroelectronics_cd00000450-329893.pdf

Can anyone tell me what the TO220-3 vs TO220-3FP package differences are, can't seem to find it anywhere.

Mark
Sharktankpro.com

Biasrocks said:

http://www.mouser.com/ds/2/389/stmicroelectronics_cd00000450-329893.pdf

Can anyone tell me what the TO220-3 vs TO220-3FP package differences are, can't seem to find it anywhere.

Click to expand...

According to that data sheet, the FP is a "dual gauge" package, and as such the thermal tab is much thicker.

The thermal data for both packages are identical.

FP (full pack?) - isolated thermal tab, higher degC/W

Ok, that makes sense.

Did some further checking, even though ST lists the L79 as a active product, they no longer offer a 18 volt version.

The highest voltage offered is 15 volts.

I came across this article which talks about altering the voltage of a fixed regulator by the addition of two resistors between Vout and Gnd (R1-470R, R2-~300R). 

Perhaps this could work if I get the -15 volt part.

http://www.rason.org/Projects/regulator/regulator.htm

Mark

Biasrocks said:

Ok, that makes sense.

Did some further checking, even though ST lists the L79 as a active product, they no longer offer a 18 volt version.

The highest voltage offered is 15 volts.

I came across this article which talks about altering the voltage of a fixed regulator by the addition of two resistors between Vout and Gnd (R1-470R, R2-~300R). 

Perhaps this could work if I get the -15 volt part.

http://www.rason.org/Projects/regulator/regulator.htm

Click to expand...

if it's acceptable to add two resistors, why not just bodge in an LM317 and be done with it?

-a

Andy Peters said:

if it's acceptable to add two resistors, why not just bodge in an LM317 and be done with it?
-a

Click to expand...

That thought had crossed my mind .

I've actually been able to talk to a tech at Ashly who told me a 1A part will work just fine in that circuit and there's plenty of those on the ground.

So to keep things clean, I'll most likely go that way.

Mark