2N2644

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2N2644 application field and working principle

Transistors - Bipolar (BJT) - Arrays provide great performance for high frequency switching, interfacing and amplification. This article will cover the application fields and working principles of one of the popular BJT arrays from the family, the 2N2644.

A 2N2644 array consists of two PNP junction transistors and one NPN junction transistor. All 3 transistors are connected in the same monolithic chip, which makes them very efficient for power and high-frequency applications. The 2N2644 has a wide range of applications in many different fields, such as motor control, AC/DC power conversion, switching power supply, signal conditioning, high-frequency amplification, and sensor interface.

The most common application of the 2N2644 array is motor control, requiring the transistors to switch on and off in order to vary the speed and direction of the motor. For this purpose, the 2N2644 is used to provide fast turn-off and turn-on times, as well as excellent isolation between the motor power stage and the control electronics. It can also be used in applications that require high input resistance, such as temperature measurement. In this case, the transistors are used to amplify the small signals generated by the temperature sensor and then pass the amplified signal to the ADC inputs of the control electronics.

The working principle of the 2N2644 transistor array is relatively simple. The transistors, or arrows, are connected in a ‘ totem pole’ configuration as shown in the diagram. Two PNP transistors are connected in series, with the collector of the first transistor connected to the emitter of the second transistor. The emitter of the first transistor is connected to the base of an NPN transistor. All the three transistors share the same collector, and the base of the NPN transistor is connected to the base of the first PNP transistor.

When a voltage is applied to the common collector, a current flows from the collector to the base of the NPN transistor, which then supplies current to the base of the first PNP transistor. This causes both transistors to turn on and provide a current path from the collector to the emitter. This current path is used to provide a signal to the control electronics. When the voltage is removed from the collector, both transistors turn off and the current path is broken.

The 2N2644 transistor array is a great option for applications requiring high-frequency switching, interfacing and amplification. It has excellent noise immunity, low power consumption, fast turn-on and turn-off times, and excellent isolation between the motor power stage and the control electronics. This makes it an ideal choice for motor control, AC/DC power conversion, switching power supply, signal conditioning, high-frequency amplification, and sensor interface applications.

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