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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IRF840A Datasheet

If you are designing a PCB or Perf board with this component then the following picture from the 2N Datasheet will be useful to know its package type and dimensions. B, Mar This datasheet jrf840a subject to change without notice.

Meaning, they can be turned on or turned off by supplying the required Gate threshold voltage VGS. Here are some examples, to illustrate what is available http: Product names and markings noted herein may be trademarks of their respective owners.

Ir840a is its listing on Ebay: Available in To package Note: TL — Programmable Reference Voltage. Use Google Search box in upper right side of this page.

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. Please contact authorized Vishay personnel to obtain datsaheet terms and conditions regarding products designed for such applications. I’ve attached an actual picture of what I’m working with. The below circuit shows how this mosfet behaves when the Gate voltage is applied 5V and not applied 0V.

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

IRF840A Datasheet PDF

Then try supplying the NPN base from the arduino pin. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by any conduct of Vishay. This happens even if I don’t even have the Ardunio hooked up.

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. Hence it is mostly used with Arduino and other microcontrollers for logic switching.


You might need something to increase the gate voltage for lower internal resistance. Except as expressly indicated in writing, Vishay products are not designed for use in medical, life-saving, or life-sustaining applications or for any other application in which the failure of the Vishay product could result in personal injury or death.

Do you do what I did and turn the power on and off really fast? Remember 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. To tackle this we should use a current limiting capacitor, I have a used a value of here.

If so, what are proper components to use? 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.

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: Speed control of motors and Light dimmers are also possible with this Mosfet since it has good switching characteristics. To avoid this problem we should always use a pull-down resistor R1here I have used a value of 10k. I’m having some very weird issues with using PWM analogWrite and the delay function.

I found that “analogWrite 9, ” worked better. MarkT Brattain Member Posts: Perhaps I should post this in a separate topic, but it is a continuation of the project addressed above and may relate to the way that I am using power. Drain Current 12 V 0. The water pump is rated at 12V and 2. Please note that some Vishay documentation may still make reference to the IEC definition.


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. I maybe could have solved this with proper use of diodes, but after a few hours of messing around, I was still stumped. When I first heard of MOSFETs and saw some pictures, I said there is no way they can carry the load that they are rated at, it takes thick wire to carry significant amounts of power, not these tiny little pins This is the source code that I used: 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.

Repetitive rating; pulse width limited by maximum junction temperature see fig. Both lowered resistance, but still kept maybe 2k ohms.

IRFA datasheet, Pinout ,application circuits Mosfet TO & SMD Power MOSFETs

How to use IRFN: 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. I’d suggest a 1K from 12V to a capacitor to ground. Current flows out through Source. You alo need to check the data sheet to see how well it performs with only 5v on the gate.

If not, what do you do, and again, what are the proper components to use? I solved this by simply adding 3 more IRF’s in parallel. I didn’t have any luck with the transistors that got from Radio Shack, I actually just ended up getting the original IRFs that I had to work by using 4 in parallel to prevent them from overheating.

This mosfet can drive loads upto 23A and can support peak current upto A.