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Email Required, but never shown. But the voltage drop is around 0.
IRF9540N MOSFET. Datasheet pdf. Equivalent
Vbe can be say 0. A FET becomes attractive: Is that the maximum and is that certain? The only problems are: A VERY undemanding spec. Mosfets are incredibly sensitive to static and I have destroyed many like this.
They are much more common, cheaper and usually have a lower on resistance than datashet for the price. You are right, using darlington i got 1. Russell McMahon k 9 Instead of switching 3. You mention mA WiFi current. If you draw a Darlington cct you will see it is different.
IRFN 데이터시트(PDF) – International Rectifier
For instance if in eg Mumbai or Bangalore there are many suppliers. BCxx7 data sheet here See Fig 9. Post as a guest Name. I may need around mA for my WiFi.
Lower values of R4 may be needed to get low enoughy saturation voltage. Best likelihood, based on all evidence and the data sheet, is that even though your load current needed is datasheeh – the Vgsth value is so far above your drive voltage that it just sits and grins at you.
So a Darlington may not do what you want but a single bipolar may. Lower beta transistors can datasgeet used with smaller values of R4.
However, the graphs are for typical values. This affects what is best to use. I would recommend against switching the ground side on complex components like a WiFi module. On page 2 of the data sheet it says Vgsth is -2V min and -4V max. The problem is the WiFi module is designed such that i have given provision to switch the 3. The connection is as follows Source 3. So now the Vgs is Saturation voltage of a bipolar transistor can be less or much less than the Vbe drop.
Vijay Anand Chandrasekaran 45 1 darasheet Also make sure you are using a static wrist datashwet and anti static bags. A normal transistor would do and i experimented too. I have no idea what could be the issue?
I am able to get it in bangalore and mumbai but they are taking long time for shipping say weeks. Resistor values are liable to be about right – play as required.
Sign up using Facebook. Thank you for understanding my problem. R3 is ‘or safety’ to ensure Q2 turns off. dataeheet
The part has a beta of typical range. Do you want some specific parts recommended or is the above good enough? The IRFN – data sheet here needs about 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. Why is my WiFi chip not powering up? Dwtasheet figs 1 and 2 suggest the 3.
Do you have easy access to a range of parts? If you pick through a bin of these you MAY find some that work somewhat better than others and some that MAY work well enough for you – but maybe not, and this cannot be guaranteed.