Is there a 3.3V replacement for the LM7805? - Electronic Circuits Projects Diagrams Free

William At MyBlueRoom · 3rd November 2006, 03:57 PM

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

eng1 · 3rd November 2006, 04:43 PM

Take a look at the LM3940.

eng1 · 3rd November 2006, 04:54 PM

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 · 3rd November 2006, 04:59 PM

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 · 3rd November 2006, 06:14 PM

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 · 3rd November 2006, 08:49 PM

http://www.national.com/pf/LM/LM3940.html

http://www.sparkfun.com/commerce/pro...roducts_id=526

http://www.sparkfun.com/datasheets/C...nts/LM7833.pdf

http://www.sparkfun.com/datasheets/C.../LD1117V33.pdf

mister_e · 3rd November 2006, 09:17 PM

BA33BC0T is another one

penoy_balut · 9th November 2006, 11:24 PM

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

William At MyBlueRoom · 10th November 2006, 01:49 PM

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)

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3rd November 2006, 03:57 PM	(permalink)
William At MyBlueRoom	Is there a 3.3V replacement for the LM7805? Is there a 3.3V replacement for the LM7805? TO-220 style? __________________ Bill Home of the Firefly PIC Tutor Inchworm ICD2 http://www.blueroomelectronics.com

3rd November 2006, 04:43 PM	(permalink)
eng1	Take a look at the LM3940.

3rd November 2006, 04:54 PM	(permalink)
eng1	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.

3rd November 2006, 04:59 PM	(permalink)
picasm	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.

3rd November 2006, 06:14 PM	(permalink)
justDIY	Does it have to be linear? LM2575-3.3 ... "Simple Switcher", only needs 3 components, 3.3v at 1A from up to 40v in __________________ If you don't have a planet, what good are gold bars? want to contact me directly? gmail gordonthree check out my project website: http://projects.dimension-x.net Favorite numbers: 09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0

3rd November 2006, 09:17 PM	(permalink)
mister_e	BA33BC0T is another one __________________ Steve

9th November 2006, 11:24 PM	(permalink)
penoy_balut	with LM317, 390 ohms, 240 ohms you will have 3.3V

10th November 2006, 01:49 PM	(permalink)
William At MyBlueRoom	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) __________________ Bill Home of the Firefly PIC Tutor Inchworm ICD2 http://www.blueroomelectronics.com