TIP122 Datasheet [100V, 5 amp, NPN, Darlington Transistor]

The TIP122 is an NPN Darlington pair transistor that is commonly used in power switching applications. It has a high current gain and can handle up to 5A of continuous current.

Here is the complete datasheet for the TIP122 transistor:

Electrical Characteristics (Do not exceed these specifications):

• Collector-Base Voltage (VCBO): 100V
• Collector-Emitter Voltage (VCEO): 100V
• Emitter-Base Voltage (VEBO): 5V
• Collector Current (IC): 5A
• Base Current (IB): 5A
• Power Dissipation (PD): 65W
• DC Current Gain (hFE): 1000 (min) at IC=3A, VCE=4V
• Switching Speed: 3MHz (typical)

Package Type:

The TIP122 transistor is available in a TO-220 package, which is a standard three-lead package with a metal tab for heat dissipation.

Pin Configuration:

As shown in the diagram, the TIP122 transistor has the following three pins:

• Pin 1: Base
• Pin 2: Collector
• Pin 3: Emitter

The internal Darlington configuration of the transistor is as shown below:

Applications:

The TIP122 transistor is commonly used in power switching applications such as:

• DC motor control
• Solenoid control
• Lamp control
• Relay control

Simplest Solar Charger Application Circuit

The following image shows how TIP122 transistor can be used to build a simplest solar charger circuit:

The output voltage is calculated using the following formula:

Vout = zener value - TIP122 forward drop

= 15 - 1 = 14 V

The TIP122 here is configured as an emitter follower, therefore its forward voltage drop will be approximately equal to 0.6 + 0.6 = 1.2 V. The double 0.6 V is due to the Darlington transistor, each dropping around 0.6 V.

Note: This datasheet is for reference only. Please refer to the manufacturer's datasheet for complete specifications and characteristics of the device.