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IRF840A Datasheet

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. It also has a threshold voltage of 4V, which means it can easily driven by low voltages like 5V. Please note that some Vishay 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. I found that “analogWrite 9, ” worked better.

TL — Programmable Reference Voltage.

Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or the continuing production of any product. Products may be manufactured at one of several qualified locations. Another problem you have is that the IRF has an enormous Ron of 0.

Customers using or selling Vishay products not expressly indicated for use in such applications do so at their own risk.

IRFA 데이터시트(PDF) – Vishay Siliconix

B, Mar This datasheet is subject irf840q change without notice. You might need something to increase the gate voltage for lower internal resistance. So my next question is what is the proper method for giving a motor more and less power? If not, what do you do, and again, what are the proper components to use? 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.


If so, what are proper components to use? Available in To package Note: 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. Have you got a potentiometer to hand, maybe 1K? 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.

Please contact authorized Vishay personnel to obtain written terms and conditions regarding products designed for such applications. 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.

Here are some examples, to illustrate what is available http: When I datawheet 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 Reliability data for Silicon Technology and Package Reliability represent a composite of all qualified locations.

Except as expressly indicated in writing, Vishay dafasheet 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.


Irfa datasheet pdf

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. 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.

You simply krf840a to drive its gate from a NPN transistor with pull-up to 12V – however the pump might be putting spikes onto the 12V rail darasheet might be an issue.

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. Repetitive rating; pulse width limited by maximum junction temperature see fig.

To avoid this problem we should always use a pull-down resistor R1here I have used a value of 10k. Use Google Search box in upper right side of this page. Drain Current 12 V 0.

Such statements are not binding statements about the suitability of products for a particular application. This apparently produces a 1V signal. Product names and markings noted herein may be trademarks of their respective owners.

Both lowered resistance, but still kept maybe 2k ohms. 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 Datasheeet had to work by using 4 in parallel to prevent them from overheating. I’ve attached an actual picture of what I’m working with. Submitted by webmaster on 8 December