Pages: [1]   Go Down
Author Topic: Transistor Recomendation  (Read 653 times)
0 Members and 1 Guest are viewing this topic.
Offline Offline
Newbie
*
Karma: 0
Posts: 7
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

I'm working on my first Arduino project and learning quite a bit as I'm going.  I would like to control a few CPU fans from the Arduino using an external power supply.  I'm hoping that I can use a transistor or small relay that can be controlled by a digital output pin on the Arduino.  It wouldn't have to be a variable control, just on and off.  I already have the external power supply of 12V and 1A to power 5-6 fans.  What would be the best transistor or relay to use?

Thanks!
Logged

"The old Europe"
Offline Offline
Edison Member
*
Karma: 1
Posts: 2005
Bootloaders suck!
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

You want a 'logic level n-channel mosfet'. They're not expensive.

One of many example would be an IRLZ44N.

Except for the obvious voltage/current capabilities, you need to watch out for the R-DS(on) value at a gate-voltate of 5V (see the datasheets). The value should be well below 0.050 Ohm.

You will find tutorials for how to wire these thing up correctly.
« Last Edit: December 22, 2011, 01:57:15 pm by madworm » Logged

• Upload doesn't work? Do a loop-back test.
• There's absolutely NO excuse for not having an ISP!
• Your AVR needs a brain surgery? Use the online FUSE calculator.
My projects: RGB LED matrix, RGB LED ring, various ATtiny gadgets...
• Microsoft is not the answer. It is the question, and the answer is NO!

0
Offline Offline
Shannon Member
****
Karma: 199
Posts: 11649
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Or a bipolar switching transistor that can handle 1A and has high gain (minimum 100 sounds good) - I am always in awe of the tiny little ZTX851, though its expensive (5A current rating, 20A pulse)
Logged

[ I won't respond to messages, use the forum please ]

Offline Offline
Newbie
*
Karma: 0
Posts: 7
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Thanks for the help!  I finally got my IRLZ44N in the mail.  How do I know which is the gate, drain and source?  I don't see it anywhere in the datasheet.

Thanks again!
Logged

Left Coast, CA (USA)
Offline Offline
Brattain Member
*****
Karma: 361
Posts: 17259
Measurement changes behavior
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Thanks for the help!  I finally got my IRLZ44N in the mail.  How do I know which is the gate, drain and source?  I don't see it anywhere in the datasheet.

Thanks again!

Show us the link to the datasheet, perhaps we can find it for you.

Logged

"The old Europe"
Offline Offline
Edison Member
*
Karma: 1
Posts: 2005
Bootloaders suck!
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

http://www.irf.com/product-info/datasheets/data/irlz44n.pdf

page 8.

It is somewhat hidden.
Logged

• Upload doesn't work? Do a loop-back test.
• There's absolutely NO excuse for not having an ISP!
• Your AVR needs a brain surgery? Use the online FUSE calculator.
My projects: RGB LED matrix, RGB LED ring, various ATtiny gadgets...
• Microsoft is not the answer. It is the question, and the answer is NO!

Offline Offline
Newbie
*
Karma: 0
Posts: 7
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Duh....I totally missed the "Lead Assignments" on the right of the diagram.  smiley-roll
Logged

"The old Europe"
Offline Offline
Edison Member
*
Karma: 1
Posts: 2005
Bootloaders suck!
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

They should've printed that on page 1. The TO-220 package is the only one they talk about anyway.
Logged

• Upload doesn't work? Do a loop-back test.
• There's absolutely NO excuse for not having an ISP!
• Your AVR needs a brain surgery? Use the online FUSE calculator.
My projects: RGB LED matrix, RGB LED ring, various ATtiny gadgets...
• Microsoft is not the answer. It is the question, and the answer is NO!

Pages: [1]   Go Up
Jump to: