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.

Author: Fer Kagam
Country: Gambia
Language: English (Spanish)
Genre: Environment
Published (Last): 26 January 2010
Pages: 317
PDF File Size: 19.5 Mb
ePub File Size: 13.99 Mb
ISBN: 122-4-25545-704-1
Downloads: 76615
Price: Free* [*Free Regsitration Required]
Uploader: Zujinn

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. B, Mar This datasheet is subject to change without notice.

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. I thought I’d post an update since everyone was so helpful. The last problem that I jrf840a was that the thing would overheat pretty bad after a just a few moments of the motor being on. If so, what are proper components to use? Hence it is mostly used with Arduino and other microcontrollers for logic switching.

MarkT Brattain Member Posts: When you turn on a Mosfet by supplying the required voltage to the gate pin, it will remain on unless you supply 0V to the gate.

IRF840A Datasheet

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. Also, I have no idea how to properly use a PNP transistor, I attempted to run the 12V through the PNP and use datashset Arduino’s 5V to turn it off an on, however this did not seem to work and I ran into all kinds of datxsheet issues such as power seeming to run back through the gate from the collector.

I solved this by simply adding 3 more IRF’s in parallel. So my next question is what is the proper method for giving a motor more and less power? Products may be manufactured at one of several qualified locations.


How to use IRFN: The below circuit shows how this mosfet behaves when the Gate voltage is applied 5V and not applied 0V. I combed over the code because oftentimes problems like this are due to coding errors, but I have not been able to find any problems in the code. To the maximum extent permitted by applicable law, Vishay disclaims i any and all liability arising out of the application or use of any product, ii any and all liability, including without limitation special, consequential or incidental damages, and iii any and all implied warranties, including warranties of fitness for particular purpose, non-infringement and merchantability.

Submitted by webmaster on 8 December Current flows out through Source. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by any daasheet of Vishay. And Arduino doesn’t have high-voltage tolerant output pins. Current flows in through Drain. 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.

Such statements are not binding statements about the suitability of products for a particular application. TL — Programmable Reference Voltage. I’d suggest a 1K from 12V to a capacitor to ground. Use Google Search box in upper right side of this page. Please contact authorized Vishay personnel to obtain written terms and dqtasheet regarding products designed for such applications.

Have you got a potentiometer to hand, maybe 1K? If not, what do you do, and again, what are the proper components to use?

HTTP This page has been moved

I looked at the spec for a the IRF, and it looks like it needs 10V to switch it on. To avoid this problem we should always use a pull-down resistor R1here I have used a value of 10k. This mosfet can drive loads upto 23A and can support peak current upto A.

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. This apparently produces a 1V signal. I’m having some very weird issues with using PWM analogWrite and the delay function.


IRF840A Datasheet PDF

Repetitive rating; pulse width limited by maximum junction temperature see fig. 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 datxsheet in parallel to prevent them from overheating. Both lowered resistance, but still kept maybe 2k ohms.

Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or the continuing production of any product. Here are some examples, to illustrate what is available http: Available in To package Note: This is the source code that I used: Daasheet found that “analogWrite 9, ” worked better.

When a gate voltage is applied these pins gets closed. Please note that some Irc840a documentation may still make reference to the IEC definition.

You alo need to check the data sheet to see how well it performs with only 5v on the gate. This happens even if I don’t even have the Ardunio hooked up.

I maybe could have solved this with proper use of diodes, but after a few hours of messing around, I was still stumped. To tackle this we should use a current limiting capacitor, I have a used a value of here. You might need something to increase the gate voltage for lower internal resistance. 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.

It also has a threshold voltage of 4V, which means it can easily driven by low voltages like 5V. Speed control of motors and Light dimmers are also possible with this Mosfet since it has good switching characteristics.