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IRF9540N MOSFET. Datasheet pdf. Equivalent

They are much more common, cheaper and usually have a lower on resistance than p-channel for the price. I may need around mA for my WiFi. Vbe can be say 0. Saturation voltage of a bipolar transistor can be less or datsaheet less than the Vbe drop.

A normal transistor in saturation may even be enough to switch a small WiFi module. Do you want some specific parts recommended or is the above good enough?

R4 then not needed but does no harm. Instead of switching 3.

IRF IRFN Power MOSFET P-Channel 23A V

This affects what is best to use. The only problems are: Home Questions Tags Users Unanswered. All the ratasheet samples in the data sheet use 10V as the gate voltage. Irf95440n WiFi chip works fine with 2. You may have misunderstood the parameter Vgsth To turn on Vs – Vg needs to be comfortably greater in magnitude than Vgsth. Russell McMahon k 9 Email Required, but never shown. The problem is the WiFi module is designed such that i have given provision to switch the 3.


A FET becomes attractive: Are you doing that? Although they usually seem to fail on rather than off.

Post as a guest Name. You are right, using darlington i got 1. If you draw a Darlington cct you will see it is different. A VERY undemanding spec. Normal transistors BC is switching only mA.

I have to go with high side switch only. Best likelihood, based on all evidence and the data sheet, is that even though your load current needed is tiny – the Vgsth value is so far above your drive voltage that it just sits and grins at you.

IRFN MOSFET Datasheet pdf – Equivalent. Cross Reference Search

Your available Vgs max is Vijay Anand Chandrasekaran 45 1 By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of datsaheet website is subject to these policies. The IRFN is unsuitable for the task. I would recommend against switching the ground side on complex components like a WiFi module. Post Your Answer Datasheeg By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.


The part has a beta of typical range.

IRF9540N Datasheet

The connection is as follows Source 3. This would not be good. To do that with eg 0.

Thank you for the link. You mention mA WiFi current.

But the voltage drop is around 0. So a Darlington may not do what you want but daatsheet single bipolar may. Why is my WiFi chip not powering up?