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The problem is the WiFi module is designed such that i have given provision to switch the 3. Instead of switching 3. R2 not required if input is always driven high or low and never floats.

A VERY undemanding spec. Vijay Anand Chandrasekaran 45 1 Iff9540n is ‘or safety’ to ensure Q2 turns off. I would recommend against switching the ground datxsheet on complex components like a WiFi module. 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. Mosfets are incredibly sensitive to static and I have destroyed many like this.

Your available Vgs max is Saturation voltage of a bipolar transistor can be less or much less than the Vbe drop. Sign datasheeet or log in Sign up using Google. A FET becomes attractive: While figs 1 and 2 suggest the 3.


I may need around mA for my WiFi.

IRFN – Infineon Technologies

My WiFi chip works fine with 2. For low saturation voltage both Darlington pair and Sziklai pair are bad because they “steal their own drive” as they turn. My load current may vary from 0 to mA.

There are many Gnd pins in WiFi chip and they are all connected so i have no option of disconnecting all the ground pins to make a low side switch.

A normal transistor in saturation may even be enough to switch a small WiFi module. The IRFN is unsuitable for the task.

Dayasheet you want some specific parts recommended or is the above good enough? A wide range of small bipolar PNPs will work. Sign up using Email and Password. You mention mA WiFi current. For instance if in eg Mumbai or Bangalore there are many suppliers.

The part has a beta of typical range. This would not be good. I have to go with high side switch only.

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It’s best to give components like that a solid connection to the ground plane without any pinch points. What is your load current? If you look at graph in the datasheet of current vs gate-source voltage Fig 3 and extrapolate down to 3V you will see that almost no current will flow. Post Your Answer Discard 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.


Here is one that seems will work with 3V sparkfun. This affects what is best to use.

IRF9540N MOSFET. Datasheet pdf. Equivalent

All the circuit samples in the data sheet use 10V as the gate voltage. I am able to get it in bangalore and mumbai but they are taking long time for shipping say weeks.

However, the graphs are for typical values. They are much more common, cheaper and usually have a lower on resistance than p-channel for the price.

IRFN MOSFET Datasheet pdf – Equivalent. Cross Reference Search

I am working in Delhi. So now the Vgs is Q2 can be a single adequately rated PNP or irf9540 smaller ones in parallel. I tried using darlington pair but the voltage drop is around 1.