Does a fast switching relay like component exist?

[9291Sam]

To elaborate on the title I am thinking a 4 pin component that takes a input voltage on two of the pins and has a connection between two other pins.

[Brumby]

Try looking up "Solid state relay".

There is quite a variety.

[BrianHG]

Any of these should do:
https://www.digikey.com/products/en/relays/solid-state-relays

[JS]

Depending on the circuit, current level on the switch, AC or DC you could use just an opto coupler or one driving a triac, or one driving a mosfet but for this last one you need an extra power source of about 10V or something like that.

JS

[BrianHG]

or one driving a mosfet but for this last one you need an extra power source of about 10V or something like that.

JS

There exist voltage out optocouplers designed for driving the gate of a mosfet without an external supply.  In fact, using a dual unit with 2 back to back mosfets, you will create your own AC switch.  Note that switch off speed is fast, but, nowhere near as fast as a mosfet driver as these special optocoupler's photovoltaic's discharge slowly.  The choice of pulldown resistor speeds this up, but, loads the output voltage as the photovoltaic optocoupler's output current is low.

In fact, this is how the DC/AC solid state relay ICs (the ones with 2 back-2-back internal mosfets like my digikey post above) actually internally work.

[james_s]

There are analog switch ICs, I don't see any mention of the type of signal being switched though. That makes a big difference.

[JS]

There exist voltage out optocouplers designed for driving the gate of a mosfet without an external supply.  In fact, using a dual unit with 2 back to back mosfets, you will create your own AC switch.  Note that switch off speed is fast, but, nowhere near as fast as a mosfet driver as these special optocoupler's photovoltaic's discharge slowly.  The choice of pulldown resistor speeds this up, but, loads the output voltage as the photovoltaic optocoupler's output current is low.

In fact, this is how the DC/AC solid state relay ICs (the ones with 2 back-2-back internal mosfets like my digikey post above) actually internally work.

I guess a second optocoupler could be useful to turn off the mosfets loading the gate drivers and discharging them faster.

Hard tp give a final answer if we don't know what the OP is switching, if a 100kW AC generator or a 3.3V logic signal...

JS