Maximum gate threshold voltage?

Question

Electronics

What happens if you apply a voltage slightly greater than the maximum threshold voltage of the gate to the gate of a field-effect transistor? For example, the gate threshold voltage is from 2 to 4 V, and apply 5 V. The field effect transistor will not burn out?

Answer 1

No, it won't burn. Provided that you do not exceed the maximum allowable voltage.

Answer 2

treshhold voltage - the voltage at which the transistor is just starting to open, which means that for the key mode it is only the smallest (as an example IRLZ44N
) gate-to-source voltage value, because the transistor will be more open, therefore the resistance of its channel is less, i.e. less heating loss of the transistor.
Usually, current graphs are given from the gate voltage at a fixed voltage; they show that at voltages close to treshhold, the current through the transistor is not very large, because it is not fully open yet.

Answer 3

the threshold voltage is the opening voltage, the minimum allowable at which the field device opens to the declared current. usually just 2-4 or less than 1 for the "logic drive"
the maximum allowable is within ~ 10v for small ones to ~ 30v for powerful power ones.

Answer 4

Maximum gate threshold voltage?

The wording of the title is missing a question word. If there were What is the maximum gate threshold voltage? , then I would answer that the threshold voltage is a technical parameter, it does not happen to be maximum, and in real circuits the voltage on the gate can be both greater than the threshold voltage and less.
If no question word is implied, then you can be understood as follows: Which transistor has the maximum gate threshold voltage?It is difficult to say, since there are many types of field workers and for the vast majority of ordinary ones it lies within 2 ... 4 volts, as already noted here. According to the principle, Upor is simply the voltage at which the field worker channel most sharply changes its resistance (i.e., the transient characteristic has the sharpest break). It is easy to measure it - you need to connect the gate and the drain, and apply +9 ... 12 volts to this point relative to the source through a 0.5 ... 3 kilo-ohm resistor. In this case, a voltage equal to the threshold voltage will be established on the transistor. This simple method allows you to select field workers with the desired Upor.

FET will not burn?

Depending on what you mean. If the breakdown of the gate insulation, then it will not burn out from 5 volts, for this, > 20 ... 25 volts must be applied to the gate. If the thermal burnout of the channel, then this is not a question of the gate voltage, but of the voltage applied to the channel and the current passing through it. And at 5 volts on the gate, this may well happen.