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Are you doing that?
The IRFN is unsuitable for the task. Do you want some specific parts recommended or is the above good enough?
The problem is the WiFi module is designed such that i have given provision to switch the 3. Is that the maximum and is that certain? A wide range of small bipolar PNPs will work.
Saturation voltage of a bipolar transistor can be less or much less than the Vbe drop. While figs 1 and 2 suggest the 3. Yes i am connecting the gate to the ground so datasheef i get You are right, using darlington i got 1.
A normal transistor would do and i experimented too. To do that with eg 0. A VERY undemanding spec.
IRFN MOSFET Datasheet pdf – Equivalent. Cross Reference Search
Email Required, but never shown. This affects what is best to use. BCxx has a typical saturation voltage of about 0. You may have misunderstood datashewt parameter Vgsth To turn on Vs – Vg needs to be comfortably greater in magnitude than Vgsth.
Lower values of R4 may be needed to get low enoughy saturation voltage. Lower beta transistors can be used with smaller values of R4. I have to go with high side switch only.
Sign up using Facebook. I would recommend against switching the ground side datashet complex components like a WiFi module. Although datasheeh usually seem to fail on rather than off.
This would not be good. But the voltage drop is around 0. Your available Vgs max is I have no idea what could be the issue?
Best likelihood, based on all evidence and dataasheet 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 – Infineon Technologies
On page 2 of the data sheet it says Vgsth is -2V min and -4V max. The falling poutput voltage “steals” drive from the input so Vc2 out can never be less than 1 x Vbe or more. The part has a beta of typical range.
IRF9540N MOSFET. Datasheet pdf. Equivalent
BCxx7 data sheet here See Fig 9. However, the graphs are for typical values. 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 dataxheet you – but maybe not, and this cannot be guaranteed. 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.
My WiFi chip works fine with 2. The only problems are: If you draw a Darlington cct you will see it is different. So now the Vgs is The IRFN – data sheet here needs about