TIP122 is a Darlington pair NPN transistor

Its a TIP122 transistor. It functions like a normal NPN transistor, but since it has a Darlington pair inside it has a good collector current rating of about 5A and a gain of about 1000. It can also withstand about 100V across its collector- Emitter hence can be used to drive heavy loads. The Darlington pair inside this transistor is shown clearly as its internal circuit schematic below. As you can see, there are two transistors inside this TO-220 package in which the emitter of the first transistor is connected with the base of the second transistor and the collector of both transistors are connected together to form a Darlington pair. This increases the current gain and current rating of this transistor.

TIP122 Datasheet:

Description

Features of TIP122 NPN Transistor 100V 5A TO-220 Package:

Darlington Medium-power NPN Transistor
High DC Current Gain (hFE), typically 1000
Continuous Collector current (IC) is 5A
Collector-Emitter voltage (VCE) is 100 V
Collector-Base voltage (VCB) is 100V
Emitter Base Voltage (VBE) is 5V
Base Current(IB) is 120mA
Available in To-220 Package

Specifications of TIP122 Transistor :

Arrangement: Single
Polarity of a transistor: NPN
Voltage of the Collector-Emitter VCEO Max: 100 V
Base-Emitter Voltage VEBO: 5 V
Voltage at the Collector-Base End VCBO: 100 V
Maximum direct current 5 A Collector Current
200 uA is the maximum collector cut-off current.
Through-Hole mounting style
Package/Case: TO-220-3
150 C is the high operating temperature.
Series: TIP122 Transistor
Packaging: Tube

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TIP122 Transistor 100V 5A TO-220 Package

TIP122 is a Darlington pair NPN transistor