PMBT2222,215

PMBT2222,215 Application Field and Working Principle

PMBT2222,215 transistors are an important part of transistors-Bipolar (BJT) - Single category, which plays a crucial role in Modern electronic designs. This article is an in-depth look into the application field and working principle of this transistor.

What is PMBT2222,215 Transistor?

PMBT2222,215 is an NPN bipolar transistor which is a three-terminal device having two p-n junctions between emitter, base and collector terminals. It is basically used to amplify and switch current and voltage levels both in digital and analog circuits. Mainly, it works in common emitter configuration. It is a Darlington pair where two transistors are connected together without a central base connection.

PMBT2222,215 Application Field

PMBT2222,215 is mainly used in applications requiring high gained amplifiers, low voltage low current/high current switching circuits and current level control circuits. Power amplifier stages of Hi-Fi amplifiers, audio output stages to drive headphone and loudspeaker, radio transmitter and mixer stages, radio receivers and oscilators are some applications where PMBT2222,215 transistors are widely used. It can also be used in analog and digital logic circuits such as Flip-Flop and Schmitt Trigger.

PMBT2222,215 Working Principle

PMBT2222,215 transistor works in common emitter configuration. Its emitter-base junction is forward biased while its collector-base junction is reverse biased. When a small current moves through the base of the transistor, it can control a much larger current flowing through collector and emitter of the transistor. When a base voltage is applied to transistor’s input, collector voltage will decrease and more current begins to flow from the collector to the emitter. This larger current then keeps the base-emitter junction in a forward-biased state, allowing even more current to flow from the collector to the emitter. This is known as transistor gain.

The working of PMBT2222,215 can also be illustrated with the help of a current mirror. The NPN transistors are connected as a dual current mirror between the collector and the emitter. The collector current (Ic) is a fraction of the emitter current (Ie). The collector current is divided between the emitter and the collector thus providing the feedback current to the emitter.

Conclusion

PMBT2222,215 is an important part of transistors-Bipolar (BJT) - Single which can be used in applications including power amplifiers, switching circuits, logic circuits, radio receivers and oscillators among others. The transistor works in common emitter configuration and the gain is determined by the current mirror between the collector and the emitter.