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Where can I find the data on different components, like mosfet enhance n channel. If I use a mosfet enhance n channel transistor with a threshold voltage of 14V will it turn on at 14V if so what voltage will it turn off,? 13V

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  • \$\begingroup\$ You can find datasheets for MOSFETs on any FET manufacturer's website. 14V is too high for a threshold, it's normally much lower. See the Id vs. Vgs characteristics on the datasheet to see the relationship. A FET is not "ON" at the threshold voltage. \$\endgroup\$ – John D Dec 7 '19 at 17:39
  • \$\begingroup\$ Thanks, where should I look to find a component that will come on at 14V and off at 13V \$\endgroup\$ – Charlie Dec 7 '19 at 17:46
  • \$\begingroup\$ You won't be able to find one as it does not exist; see my answer. \$\endgroup\$ – Justme Dec 7 '19 at 17:48
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    \$\begingroup\$ Duplicate of Switch that turns on and off with variable voltage also asked by you today. \$\endgroup\$ – Chris Stratton Dec 7 '19 at 17:52
  • \$\begingroup\$ This desired threshold switch behavior appears to be a restating of your existing question of today electronics.stackexchange.com/questions/470714/… only with critical detail missing. Do not post the same problem multiple times. The path to a solution and the potential issues with it were already explained at your existing question, this tangent is not productive. \$\endgroup\$ – Chris Stratton Dec 7 '19 at 17:53
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FET threshold voltage is the voltage where it has barely started to conduct. You won't be able to find a FET or other component that turns fully on at 14V and fully off at 13V, you need much more than that, a complete circuit with lots of components.

In general you pick a component and it will have a datasheet. Or you can search for components given some parameters like maximum current or on resistance.

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