Is there any way to prevent a transistor from saturation mode

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Vijay Vinay

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Hello all,
I have a transistor which is currently working in saturation mode. However, I need this transistor not to work in saturation mode, since I need to use the transistor to work as a switch. Could anyone help me how to acheive this. Help is appreciated.

Thanks
 

Hi,

Transistor as switch, so why not saturation?

Klaus
 

If you use the Baker clamp you need to use fast recovery
or Schottky diodes. Otherwise diode storage time can
defeat your attempts. You can use a Shottky-vs-FRD
Baker pair to push the output a little lower but not all
the way into saturation. You can also play with base
resistor divider vs Schottky styles, if the transistor is
not pulling a lot of (variable) base current.
 
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    Vijay Vinay

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I believe we should continue the discussion after he OP has clearly told what he want to achieve. The stated alternative "saturation" or "switch" suggests a misunderstanding.
 

Is the transistor a Mosfet that is a switch when it is turned on hard and is said to be "linear" but not a "saturated" linear resistance?
 

Switching BJTs are ones meant to have low saturation
recovery time. They only "switch" to (near) emitter
voltage, or open. But for some applications that's all
that's wanted. Nobody said "ideal switch".
 

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If the transistor is an NPN type, use a Shottky diode between base and collector, anode on base.
This will prevent transistor from saturation.
Anyway now is plenty of fast switching transistors, any range of voltage and current.
 

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