Tell me more ×
Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. It's 100% free, no registration required.

I have a 5V PIC16f877a controlling the speed of the motor 12V which has a power rating of 8W; the current will be around(600mA) am I correct?

The motor is basically a small water pump commonly used in aquariums. After much research; I still don't know what is the best MOSFET to use. As I saw some of the answers use logic-level MOSFETs? I have IRFZ46N and IRFZ22 in my hand; is the two transistor suitable and enough? or is there any other IR transistor is more suitable. i think IR will be much more available in my country. Will the 12V 1000mA power supply I have enough?

share|improve this question
If the MOSFETs are in your hand, be careful with the pins, or you could ruin them by ESD. :-) – Anindo Ghosh Mar 7 at 18:14
Could you please add links to the relevant datasheets to your question? Also, please remove the last -nearly useless- sentence. – Camil Staps Mar 7 at 18:14
You mention "my country", but didn't fill in any location in your profile. – Olin Lathrop Mar 7 at 19:04

2 Answers

up vote 0 down vote accepted

My usual part for this application would be the IRLML2502. It can easily handle the current, has nicely low Rdson with 5 V drive, and is good to 20 V.

Don't forget the reverse Schottky diode accross the motor or you'll blow out whatever trasistor you use after the first few times it tries to turn off the motor.

share|improve this answer

In order to compare two MOSFETs, a \$Q_{g}\cdot{}R_{ds(on)}\$ figure of merit is typically used. This will give you a rough idea of how good a MOSFET is for switching application. You will get both \$Q_{g}\$ and \$R_{ds(on)}\$ in the datasheets.

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.