In which region transistor acts as a switch?

saturation region

What are the modes in which transistor is used as a switch?

Both PNP and NPN transistors can be utilized as switches. A basic terminal transistor can be handled differently from a signal amplifier by biasing both NPN and PNP bipolar transistors by an “ON / OFF” static switch. One of the main uses of the transistor to transform a DC signal “On” or “OFF” is solid-state switches.

Which transistor is best for switching?

Best Transistors: BJTs

#1 NPN – 2N3904. You can find most often NPN Transistors in low-side switch circuits.
#2 PNP – 2N3906. For high-side switch circuits, you need a PNP style BJT.
#3 Power – TIP120.
#4 N-Channel (Logic Level) – FQP30N06L.

What is the symbol of PNP transistor?

PNP vs NPN Transistor

	PNP Transistor	NPN Transistor
Symbol
Collector-emitter voltage	Negative	Positive
Emitter arrow	Pointed in	Pointed out

Where is PNP transistor used?

PNP transistors are used in amplification circuits. PNP transistors are used in Darlington pair circuits. PNP transistors are used in robotic applications. PNP transistors to control current flow in heavy applications.

What is PNP NPN?

PNP sensors produce a positive output to your industrial controls input, while NPN sensors produce a negative signal during an “on” state. NPN, or “sinking” output sensors, work in the opposite way, sinking ground voltage to an input when it’s on.

What is the symbol of NPN and PNP transistor?

NPN vs PNP Transistor

	NPN Transistor	PNP Transistor
Symbol
Collector-emitter voltage	Positive	Negative
Emitter arrow	Pointed out	Pointed in