Hi
Can I replace an irf640 with an irfb7437 ? I only have this one at moment

 

As long as your not using more then 40 volts it's only rated for 40 volts the irfb7437

The irf640 is rated for 200 volts

 

As long as your not using more then 40 volts it's only rated for 40 volts the irfb7437

The irf640 is rated for 200 volts

Thank you so much. It's for a 12v engine control module. I believe it will work. I do appreciate your kindness

 

First, ask yourself why a 200V transistor was used in the original.
Is it in a part of the circuit that generates high voltages?

 

Thats funny the irfb7437 is good for 195 amps the irf640 is 18 amps
Ian0 i don't think he will have a problem with a 12 volt motor
He probably found the circuit on the internet where someone just said use irf640 because they had one lol

 

Thats funny the irfb7437 is good for 195 amps the irf640 is 18 amps
Ian0 i don't think he will have a problem with a 12 volt motor
He probably found the circuit on the internet where someone just said use irf640 because they had one lol

“Engine control module” is rather ambiguous. Maybe it generates a higher voltage for the ignition. Maybe it doesn’t. Maybe, like you said, whoever designed it had a job lot of IRF640 and decided to use them. Reverse engineering always produces some odd conundrums. Often I wonder why a weird and wonderful E96 value resistor has been used to drive an LED.

 

Thats funny the irfb7437 is good for 195 amps the irf640 is 18 amps
Ian0 i don't think he will have a problem with a 12 volt motor
He probably found the circuit on the internet where someone just said use irf640 because they had one lol

I have used it and it's working perfectly. The engine is running like new and I am very happy.
Thanks for your assistance my brother.

 

Engine control module just runs some motors only 12 volts stuff fuel pump air and spark but it doesn't output high voltage
Thats handled by power pack these days.

 

Engine control module just runs some motors only 12 volts stuff fuel pump air and spark but it doesn't output high voltage
Thats handled by power pack these days.

Yes

 

Yes

Now working on some solar panel inverters