IRFA Transistor Datasheet, IRFA Equivalent, PDF Data Sheets. MOSFET. Parameters and Characteristics. Electronic Component Catalog. Vishay IRFA MOSFET are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for Vishay IRFA MOSFET. IRFA. TOAB. SMPS MOSFET. HEXFET. ®. Power MOSFET l Switch Mode Power Supply (SMPS) l Uninterruptable Power Supply.

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Meaning, they can be turned on or turned off by supplying the required Gate threshold voltage VGS. I looked at the spec for a the IRF, and it looks like it needs 10V to switch it on.

Mosfet TO-220 & SMD220 Power MOSFETs

Here is the part of the code where the delay is not working, I set it up to eliminate any outside factors: I found that “analogWrite 9, ” worked better. Also, I have no idea how to properly use a PNP transistor, I attempted to run the 12V through the PNP and use the Arduino’s 5V to turn it off an on, however this did not seem to work and I ran into all kinds of crazy issues such as power seeming to run back through the gate from the collector.

It also has a threshold voltage of 4V, which means it can easily driven irc840a low voltages like 5V.

Irf8440a MOSFETS have an effectively infinite input resistance so if the gate is left floating it will pick whatever ions are floating around in the air, respond to any slight leakage currents that might be present. I’d suggest a 1K from 12V to a capacitor to ground.


To avoid datadheet problem we should always use a pull-down resistor R1here I have used a value of 10k. If not, what do you do, and again, what are the proper components to use? Product names and markings noted herein may be trademarks of their respective owners.

If so, what are proper components to use? Available in To package Note: This happens even if I don’t even have the Ardunio hooked up. This mosfet can drive loads upto 23A and can support peak current upto A. Submitted by webmaster on 8 December Once I dahasheet these things, the resistance seemed to drop to zero when I applied 5V to the gate.

Current flows out through Source. TL — Programmable Reference Voltage. Also of note is that the delay function seems to work just fine if I remove the PWM pin so that it is not connected to anything. Another problem you have is that the IRF has an enormous Ron of 0.

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IRFA Vishay, IRFA Datasheet

I maybe could have solved this with proper use of diodes, but after a few hours of messing around, I was still stumped. Tying the gate to the source with a high value resistor is a good plan as people have mentioned, such as 1Mohm, so that its safely off until setup has run.

So if you are looking for a Mosfet to switch applications that consume high current with some logic level devices then this Mosfet will be a perfect choice for you. The last problem that I had was that the thing would overheat pretty bad after a just a few moments of the motor being on.


This is its listing on Ebay: My problem is that it never seems to be in an off state, as soon as I connect the power, the pump turns on and the MOSFET gets really hot. Hence it is mostly used with Arduino and other microcontrollers for logic switching. Reliability data for Silicon Technology and Package Reliability represent a composite of all qualified locations.

You might need something to increase the gate voltage for lower internal resistance. Customers using or selling Vishay products not expressly indicated for use in such applications do so at their own risk.

Such statements are not binding statements about the suitability of products for a particular application. Both lowered resistance, but still kept maybe 2k ohms. The water pump is rated at 12V and 2. Since this an N-Channel mosfet the load that has to be switched in this case a motor should always be connected above the drain pin.

You simply need to drive its gate from a NPN transistor with pull-up to 12V – however the pump might be putting spikes onto the 12V rail which might be an issue. I went to Radio Shack today and picked up a few things that I thought would be helpful and help get me ahead of where I was yesterday: