Darlington transistor

The term

Darlington transistor is named from its inventor’s name Sidney Darlington. The Darlington transistor is made up of two PNP or NPN BJTs by connecting together. The emitter of the PNP transistor is connected to the base of the other PNP transistor to create a sensitive transistor with high current gain used in many applications where switching or amplification is crucial. The transistor pair in the Darlington transistor can be formed with two separately connected BJTs. As we know that, the transistor is used as a switch as well as an amplifier, the BJT can be used to operate as an ON/OFF switch. Darlington Transistor.

This transistor is also called as a Darlington pair, contains two BJTs that are connected to deliver a high current gain from a low base current. In this transistor, the emitter of the i/p transistor is connected to the o/p of the base of the transistor and the collectors of the transistor are wired together. So, the i/p transistor amplifies the current even further amplifies by the o/p transistor. Darlington transistors are classified into different types by Power Dissipation, Max CE Voltage, Polarity, Min DC Current Gain and Type of Packaging. The common values of max CE voltage are 30V, 60V, 80V & 100V. The max CE voltage of Darlington transistor is 450V and power dissipation can be in the range of 200mW to 250mW.

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