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Understanding TIP120 Transistor

The TIP120 transistor is a powerful component widely used in electronics for switching and amplification tasks. This article will guide you through its features, uses, and how it works, while offering helpful details on how to use it in your own projects. Whether you’re controlling high-current devices or managing simple circuits, the TIP120 provides a reliable solution that can easily be integrated with microcontrollers like Arduino. Keep reading to explore everything you need to know about this versatile transistor, from its design to practical applications.

Catalog

Introduction to the TIP120 Transistor

The TIP120 is an NPN transistor that includes a Darlington pair, giving it enhanced capabilities compared to a standard NPN transistor. With a high collector current rating of about 5A and a gain of approximately 1000, it is well-suited for handling larger loads. It can also withstand up to 60V across the collector-emitter, making it a good option for applications that require managing high voltages. If higher voltage handling is needed, other transistors in the same family could be explored as alternatives.

The internal layout of the TIP120 shows how the Darlington pair is formed, with two transistors working together. The emitter of the first transistor connects to the base of the second, and the collectors of both transistors are combined, resulting in increased current gain and better overall performance for controlling larger loads.

Pin Configuration of TIP120

CAD Models and Symbols for TIP120

TIP120 Symbol

TIP120 Footprint

TIP120 3D Model

Applications of TIP120 Transistor

The TIP120 is a versatile choice for a variety of switching and amplification tasks. Whether you're driving high-power LEDs, controlling motors, or using it in relay circuits, this transistor can handle it. When it's used as a switch, it only needs a small base current (about 120mA) to control larger currents, up to 5A. This makes it ideal for applications where you need to manage high-power components but want to control them with lower-powered logic devices, like microcontrollers. The TIP120 is often found in circuits that demand strong amplification or need to manage higher currents reliably.

Ensuring Long-Term Use of TIP120 in Circuits

To make sure your TIP120 transistor works effectively for a long time, it's a good idea to stay within its limits. Keep the voltage below 60V and the current under 5A for safe operation. Proper pin configuration is essential, so always double-check before connecting it into a circuit. A heatsink is important, especially when dealing with higher loads, as it helps dissipate heat and prevents overheating. Using a resistor at the base will also ensure that the transistor functions efficiently. Keep it within recommended temperature ranges—between -65°C and +150°C—to avoid damaging the transistor.

Key Features of TIP120

NPN Darlington Transistor

The TIP120 is an NPN Darlington transistor, consisting of two transistors working together. This arrangement amplifies current, allowing it to manage larger loads effectively.

High DC Current Gain

With a typical current gain of 1000, the TIP120 is excellent for increasing small input currents to much larger output currents, making it suitable for applications that require amplification.

Continuous Collector Current

It can handle a continuous collector current of up to 5A, which means it can control higher power devices consistently without experiencing issues like overheating.

Collector-Emitter Voltage

The TIP120 can tolerate up to 60V between the collector and emitter, making it suitable for use in circuits that operate at higher voltage levels, offering flexibility in different designs.

Emitter-Base Voltage

With a low emitter-base voltage of 5V, it is easily controlled by lower-powered devices such as microcontrollers, which makes integration with logic circuits straightforward.

Base Current

The TIP120 requires a base current of around 120mA to fully turn on, making it efficient for switching applications where a small input can control a much larger output.

Peak Load Current

While the continuous current is 5A, the TIP120 can handle brief peaks of up to 8A, providing extra capacity for short-duration high current demands.

TO-220 Package

The TO-220 package is designed for components that need efficient heat dissipation. When used with a heatsink, this allows the TIP120 to operate under high-power conditions without overheating.

Common Uses of TIP120 Transistor

Switching High Current Loads

The TIP120 is commonly used to switch high current loads like motors or large arrays of LEDs. Its ability to handle up to 5A makes it a reliable component for managing these larger power devices.

Medium Power Switches

For applications needing medium power switches, the TIP120 is a good fit. It can handle moderate amounts of power, making it suitable for relays or other circuits requiring controlled switching.

High Amplification Circuits

Its high current gain makes the TIP120 a great choice for circuits that require significant amplification. It can take a small signal and boost it to a much larger output, ideal for audio or signal processing circuits.

Motor Speed Control

The TIP120 is frequently used in circuits designed to control motor speed by adjusting the current supplied to the motor, offering a way to fine-tune motor operation based on specific needs.

Inverter and Rectifier Circuits

In inverter and rectifier circuits, the TIP120 plays a role in switching between different voltage states, helping to manage the conversion of power between AC and DC formats.

Equivalent Components for TIP120

Equivalent components for the TIP120 include:

• TIP127 (PNP)

• 2N5306

• 2N6532

• 2SD1415

• 2SD2495

• BDT63

• BDW2

• KSB601

• KSD560

• MJF6388

Package Information for TIP120

Manufacturer Details for TIP120

The TIP120 is produced by On Semiconductor, a company focused on making energy-efficient products. They offer a range of solutions designed to reduce power consumption while maintaining high reliability. With a global presence, their manufacturing facilities, design centers, and sales offices are strategically located across key regions in North America, Europe, and Asia. Their goal is to offer products that help industries manage power more effectively, and the TIP120 is a part of their lineup aimed at simplifying power management in various applications.

Technical Specifications of TIP120

ON Semiconductor's TIP120 technical specifications, features, parameters, and related components with similar specifications.

Type	Parameter
Mount	Through Hole
Mounting Type	Through Hole
Package / Case	TO-220-3
Number of Pins	3
Supplier Device Package	TO-220-3
Weight	1.214g
Collector-Emitter Breakdown Voltage	100V
Current - Collector (Ic) (Max)	5A
Number of Elements	1
hFE Min	1000
Operating Temperature	150°C TJ
Packaging	Bulk
Published	2007
Part Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Max Operating Temperature	150°C
Min Operating Temperature	-65°C
Voltage - Rated DC	60V
Max Power Dissipation	65W
Current Rating	5A
Base Part Number	TIP120
Polarity	NPN
Element Configuration	Single
Power Dissipation	65W
Power - Max	2W
Transistor Type	NPN - Darlington
Collector Emitter Voltage (VCEO)	60V
Max Collector Current	200μA
DC Current Gain (hFE) (Min) @ Ic, Vce	1000 @ 3A 3V
Current - Collector Cutoff (Max)	500μA
Vce Saturation (Max) @ Ib, Ic	4V @ 20mA, 5A
Voltage - Collector Emitter Breakdown (Max)	60V
Max Breakdown Voltage	60V
Collector Base Voltage (VCBO)	60V
Emitter Base Voltage (VEBO)	5V
Continuous Collector Current	5A
Height	9.2mm
Length	9.9mm
Width	4.5mm
REACH SVHC	No SVHC
Radiation Hardening	No
RoHS Status	RoHS Compliant
Lead Free	Lead Free

Datasheet PDF

TIP120 Datasheet:

TIP120.pdf

TIP120.pdf

TIP120.pdf

Frequently Asked Questions [FAQ]

1. Is the TIP120 an NPN or PNP transistor?

The TIP120 is an NPN Darlington Power Transistor. It can handle switching loads up to 60V, with a peak current of 8A and a continuous current of 5A.

2. How does the TIP120 transistor work?

The TIP120 contains a Darlington pair, where two transistors are connected. The first transistor amplifies the current, and the second one amplifies it even further. This setup provides a much higher current gain compared to using just a single transistor.

3. Can I use a BC547 instead of a TIP120?

While the BC547 is not an exact replacement for the TIP120, there are alternatives depending on your needs. The TIP122 is a good alternative for similar power levels. For lower power, you can use transistors like the 2N3904, BC547, BC538, 2N4401, or 2N2222A.

4. How do you use a TIP120 transistor with an Arduino?

The TIP120 is commonly used for switching high-current DC loads with an Arduino due to its availability and ease of use. The Arduino provides a small base current to the TIP120 to switch on a high-current load, such as a motor or lamp, connected to an external power supply. You’ll need to connect the transistor's base to one of the PWM pins on the Arduino, such as pin 3 on the Arduino UNO, but you can use other PWM pins based on your switching needs.