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By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The connection is as follows Source 3. So now the Vgs is Instead of switching 3.

My WiFi chip works fine with 2. I have no idea what irf9450n be the issue? Why is my WiFi chip not powering up? Any help would be appreciated. The IRFN is unsuitable for the task. You may have misunderstood the parameter Vgsth To turn on Vs – Datzsheet needs to be comfortably greater in magnitude than Vgsth. Your available Vgs max is The IRFN – data sheet here needs about While figs 1 and 2 suggest the 3.

On page 2 of the data sheet it says Vgsth is -2V min and -4V max.

IRF9540N MOSFET. Datasheet pdf. Equivalent

This would not be good. If you pick through a bin of these you MAY find some that work somewhat better than others and some that MAY satasheet well enough for you – but maybe not, and this cannot be guaranteed. Best likelihood, datssheet 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.

For low saturation voltage both Darlington pair and Sziklai pair are bad because they “steal their own drive” datashdet they turn. R4 then not needed but does no harm. Q2 can be a single adequately rated PNP or several smaller ones in parallel. A wide range of small bipolar PNPs will work.

BCxx7 data sheet here See Fig 9. BCxx has a typical saturation voltage of about 0. The part has a beta of typical range. Lower beta transistors can be used with smaller values of R4. Resistor values are liable to be about right – play as required.


R2 not required if input is always driven high or low and never floats. R3 is ‘or safety’ to ensure Q2 irf9540 off. Lower values of R4 may be needed to get low enoughy dafasheet voltage. A FET becomes attractive: If datssheet 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. All the circuit samples in the data sheet use 10V as the gate voltage.

A normal transistor in saturation irf95400n even be enough to switch a small WiFi module. Also make sure you are using a static wrist strap and anti static bags. Mosfets are incredibly sensitive to static and I have destroyed many like this. Although they usually seem to fail on rather than off.

IRF9540N Datasheet

By clicking “Post Your Answer”, irf5940n 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. Home Questions Tags Users Unanswered. Vijay Anand Chandrasekaran 45 1 Are you doing that? Yes i am connecting the gate to the ground so that i get You mention mA WiFi current.

Is that the maximum and is that certain?

To do that with eg 0. A VERY undemanding spec. Do you have easy access to a range of parts? For instance if in eg Mumbai or Bangalore there are many suppliers.

IRFN – Infineon Technologies

Do you want some specific parts recommended or is the above good enough? I am working in Delhi. I am able to get it dahasheet bangalore and mumbai but they are taking long time for shipping say weeks. Can you please suggest me some MOSFETs specific parts which are locally available or which people often use for their research? Thank you for understanding my problem.

However, the graphs are for typical values. Russell McMahon k 9 But the voltage drop is around 0. Saturation voltage of a bipolar transistor can be less or much less than the Vbe drop. Vbe can be say 0. What is your load current? This affects what is best to use.


If you draw a Darlington cct you will see it is different. The falling poutput voltage irf950n drive from the input so Vc2 out can never be less than 1 x Vbe or more. So a Darlington may not do what you want but a single bipolar may. You are right, using darlington i got 1. My load current may vary from 0 to mA. Your circuit seems correct in principle.

IRFN MOSFET Datasheet pdf – Equivalent. Cross Reference Search

The only problems are: A normal transistor would do and i experimented too. Normal transistors BC is switching only mA. I may need around mA for my WiFi. I tried using darlington pair but the voltage drop is around 1. They are much more common, cheaper and usually have a lower on resistance than p-channel for the price. Ief9540n is one that seems will work with 3V sparkfun.

I would recommend against switching the ground side on complex components like a WiFi module. It’s best to give components like that a solid connection to the ground plane without any pinch points. Datawheet you for the link.

The problem is the WiFi module is designed such that i have given provision to switch the 3. 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.

I have to go with high side switch only. Sign up or log in Sign up using Google.

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Post Your Answer Discard By clicking “Post Your Satasheet, 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.