Is there a 3.3V replacement for the LM7805?

William At MyBlueRoom

New Member

• Nov 3, 2006

• #1

Is there a 3.3V replacement for the LM7805? TO-220 style?

 

E

eng1

New Member

• Nov 3, 2006

• #2

Take a look at the LM3940.

 

E

eng1

New Member

• Nov 3, 2006

• #3

What current do you need? and what is the input voltage?

The LM3940 can't be operated with high input voltages.
The LM2937-3.3 has a wide input voltage range but it can supply up to 500 mA.

 

picasm

Member

• Nov 3, 2006

• #4

An LM317 can supply 3.3v - it's not a direct replacement, you have to use two resistors to set the voltage.
It is a good regulator though -better than a 7805.

 

justDIY

Active Member

• Nov 3, 2006

• #5

Does it have to be linear?

LM2575-3.3 ... "Simple Switcher", only needs 3 components, 3.3v at 1A from up to 40v in

 

hotwaterwizard

Active Member

• Nov 3, 2006

• #6

**broken link removed**

http://www.sparkfun.com/commerce/product_info.php?products_id=526

https://www.electro-tech-online.com/custompdfs/2006/11/LM7833.pdf

https://www.electro-tech-online.com/custompdfs/2006/11/LD1117V33.pdf

 

Attachments

• 5v to 3.3v regulator LM3940.gif

  7.2 KB · Views: 11,481

M

mister_e

New Member

• Nov 3, 2006

• #7

BA33BC0T is another one

 

P

penoy_balut

New Member

• Nov 9, 2006

• #8

with LM317, 390 ohms, 240 ohms you will have 3.3V

 

William At MyBlueRoom

New Member

• Nov 10, 2006

• #9

Thanks the LM2940 3.3 looks like the part I'll use. I wanted to drop in a 3.3 into the Inchworm ICD2 for 3.3V projects. (Use a 3.3v MAX 232 too)