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You are here: Home / Datasheets and Components / TIP122 Datasheet [100V, 5 amp, NPN, Darlington Transistor]

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

Last Updated on February 23, 2023 by Swagatam Leave a Comment

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.

Table of Contents
  • Electrical Characteristics (Do not exceed these specifications):
  • Package Type:
  • Pin Configuration:
  • Applications:
  • Simplest Solar Charger Application Circuit

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:

warning message: electricity is dangerous, proceed with caution
TIP122 pinouts
  • Pin 1: Base
  • Pin 2: Collector
  • Pin 3: Emitter

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

TIP122 internal Darlington configuration

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:

TIP122 simplest 12V battery 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.

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Filed Under: Datasheets and Components Tagged With: 100V, Darlington, Datasheet, NPN, TIP122, Transistor

About Swagatam

I am an electronics engineer and doing practical hands-on work from more than 15 years now. Building real circuits, testing them and also making PCB layouts by myself. I really love doing all these things like inventing something new, designing electronics and also helping other people like hobby guys who want to make their own cool circuits at home.

And that is the main reason why I started this website homemade-circuits.com, to share different types of circuit ideas..

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