i have a trigger signal of 8V and need to be distributed to 4 devices, need techniques to achieve this

 

You can use four diodes, or a cd4016 quad switch,,, ideally we need more information on the devices being triggered..

 

cd4016 quad switch

There are four individual systems requiring trigger signal to perform some action, they will be connected to my board using bnc cable.

 

An op amp buffer/line driver comes to mind

 

I am not getting any fanout buffer/line driver which supports 8V input signal

 

Emitter follower?

 

Trigger signal - frequency, pulse width, amplitude?
Output impedance of the trigger source and input impedance of the four destinations?

 

Amplitude: +8 ±1 V

Drive capacity 75 Ohm nominal load, max trigger duty cycle is 20%.

Rise time <=30 ns (10-90%)

 

That's over 100mA drive current - times 4 four!
I agree with Alec_t the first option to try (simulate?) is four emitter followers.
Amazingly, the golden oldie, NE555, comes close to being able to do this except typical rise time of 100nS

 

Simulation shows a 2N3904 should make a fast enough emitter-follower.

 

What about an 8 V power supply and saturated switches rather than emitter followers?
Also, is there a required min or max fall time?
Also, since you are using 75 ohm cable, do you need a 75 ohm output impedance to minimize reflections.
Also, 75 ohms and 8 V makes me thing broadcast facility sync pulses...?
Also, what are the min and max frequencies of the pulse train?

ak