2N3055 Power Transistor: 2N3055 vs TIP3055, Pinout, and Datasheet
STMICROELECTRONICS 2N3055 Bipolar (BJT) Single Transistor, NPN, 60 V, 3 MHz, 115 W, 15 A, 70 hFE









STMICROELECTRONICS 2N3055 Bipolar (BJT) Single Transistor, NPN, 60 V, 3 MHz, 115 W, 15 A, 70 hFE
Today, we will walk you through the introduction of the popular dual op amp 2N3055, you will learn its pinout, features, application, circuit diagram and its differences with TIP3055, and more.

2N3055 It's More Than A Transistor / Use For Different Purposes / Alternative electronics
2N3055 Description
2N3055 is a general purpose NPN power transistor manufactured using the base epitaxial process, mounted in a hermetically sealed metal package, and designed for general purpose switching and amplifier applications.
2N3055 is preferred if you want a simple switching device for medium power loads. 2N3055 is one of the cheapest base transistors on the market and with characteristics suitable for many applications.
2N3055 is also used in audio power amplifiers. The device has a good gain factor and the gain is also almost linear, making the 2N3055 one of the best power amplifier solutions.
2N3055 Pinout and Configuration

Like any other transistor, 2N3055 has three pins namely EMITTER, BASE, and COLLECTOR. The pin configuration of 2N3055 is given below.
| Pin Number | Pin Name | Description |
| 1 | Base (B) | Normally used as a trigger to turn ON the transistor |
| 2 | Emitter (E) | Normally connected to GROUND |
| TAB or CASE | Collector (C) | Normally connected to LOAD |
2N3055 Features
Medium power transistor
The excellent safe operating area
Complementary NPN - PNP transistors
The low collector-emitter saturation voltage
Pb−free packages are available
DC current gain (hFE) up to 70
With hfe improved linearity
The maximum voltage across collector and emitter: 60V DC
Maximum current allowed trough collector: 15A DC
The maximum voltage across base and emitter: 7V DC
Maximum current allowed through base: 7A DC
The maximum voltage across collector and base: 100V DC
Operating temperature range: -65ºC to +200ºC
Total power dissipation: 115W
2N3055 Applications
Power switching circuits
Amplifier circuits
PWM applications
Regulator circuits
Switch mode power supply
Signal Amplifiers
2N3055 Functional Equivalents

Specifications
- TypeParameter
- Mount
In electronic components, the term "Mount" typically refers to the method or process of physically attaching or fixing a component onto a circuit board or other electronic device. This can involve soldering, adhesive bonding, or other techniques to secure the component in place. The mounting process is crucial for ensuring proper electrical connections and mechanical stability within the electronic system. Different components may have specific mounting requirements based on their size, shape, and function, and manufacturers provide guidelines for proper mounting procedures to ensure optimal performance and reliability of the electronic device.
Chassis Mount, Through Hole - Mounting Type
The "Mounting Type" in electronic components refers to the method used to attach or connect a component to a circuit board or other substrate, such as through-hole, surface-mount, or panel mount.
Chassis Mount - Package / Case
refers to the protective housing that encases an electronic component, providing mechanical support, electrical connections, and thermal management.
TO-204AA, TO-3 - Number of Pins2
- Weight4.535924g
- Transistor Element Material
The "Transistor Element Material" parameter in electronic components refers to the material used to construct the transistor within the component. Transistors are semiconductor devices that amplify or switch electronic signals and are a fundamental building block in electronic circuits. The material used for the transistor element can significantly impact the performance and characteristics of the component. Common materials used for transistor elements include silicon, germanium, and gallium arsenide, each with its own unique properties and suitability for different applications. The choice of transistor element material is crucial in designing electronic components to meet specific performance requirements such as speed, power efficiency, and temperature tolerance.
SILICON - Collector-Emitter Breakdown Voltage60V
- Collector-Emitter Saturation Voltage1V
- Number of Elements1
- hFEMin20
- Operating Temperature
The operating temperature is the range of ambient temperature within which a power supply, or any other electrical equipment, operate in. This ranges from a minimum operating temperature, to a peak or maximum operating temperature, outside which, the power supply may fail.
200°C TJ - Packaging
Semiconductor package is a carrier / shell used to contain and cover one or more semiconductor components or integrated circuits. The material of the shell can be metal, plastic, glass or ceramic.
Tray - JESD-609 Code
The "JESD-609 Code" in electronic components refers to a standardized marking code that indicates the lead-free solder composition and finish of electronic components for compliance with environmental regulations.
e3 - Pbfree Code
The "Pbfree Code" parameter in electronic components refers to the code or marking used to indicate that the component is lead-free. Lead (Pb) is a toxic substance that has been widely used in electronic components for many years, but due to environmental concerns, there has been a shift towards lead-free alternatives. The Pbfree Code helps manufacturers and users easily identify components that do not contain lead, ensuring compliance with regulations and promoting environmentally friendly practices. It is important to pay attention to the Pbfree Code when selecting electronic components to ensure they meet the necessary requirements for lead-free applications.
yes - Part Status
Parts can have many statuses as they progress through the configuration, analysis, review, and approval stages.
Obsolete - Moisture Sensitivity Level (MSL)
Moisture Sensitivity Level (MSL) is a standardized rating that indicates the susceptibility of electronic components, particularly semiconductors, to moisture-induced damage during storage and the soldering process, defining the allowable exposure time to ambient conditions before they require special handling or baking to prevent failures
1 (Unlimited) - Number of Terminations2
- ECCN Code
An ECCN (Export Control Classification Number) is an alphanumeric code used by the U.S. Bureau of Industry and Security to identify and categorize electronic components and other dual-use items that may require an export license based on their technical characteristics and potential for military use.
EAR99 - Terminal Finish
Terminal Finish refers to the surface treatment applied to the terminals or leads of electronic components to enhance their performance and longevity. It can improve solderability, corrosion resistance, and overall reliability of the connection in electronic assemblies. Common finishes include nickel, gold, and tin, each possessing distinct properties suitable for various applications. The choice of terminal finish can significantly impact the durability and effectiveness of electronic devices.
Tin (Sn) - Voltage - Rated DC
Voltage - Rated DC is a parameter that specifies the maximum direct current (DC) voltage that an electronic component can safely handle without being damaged. This rating is crucial for ensuring the proper functioning and longevity of the component in a circuit. Exceeding the rated DC voltage can lead to overheating, breakdown, or even permanent damage to the component. It is important to carefully consider this parameter when designing or selecting components for a circuit to prevent any potential issues related to voltage overload.
60V - Max Power Dissipation
The maximum power that the MOSFET can dissipate continuously under the specified thermal conditions.
115W - Terminal Position
In electronic components, the term "Terminal Position" refers to the physical location of the connection points on the component where external electrical connections can be made. These connection points, known as terminals, are typically used to attach wires, leads, or other components to the main body of the electronic component. The terminal position is important for ensuring proper connectivity and functionality of the component within a circuit. It is often specified in technical datasheets or component specifications to help designers and engineers understand how to properly integrate the component into their circuit designs.
BOTTOM - Terminal Form
Occurring at or forming the end of a series, succession, or the like; closing; concluding.
PIN/PEG - Current Rating
Current rating is the maximum current that a fuse will carry for an indefinite period without too much deterioration of the fuse element.
15A - Base Part Number
The "Base Part Number" (BPN) in electronic components serves a similar purpose to the "Base Product Number." It refers to the primary identifier for a component that captures the essential characteristics shared by a group of similar components. The BPN provides a fundamental way to reference a family or series of components without specifying all the variations and specific details.
2N30 - Pin Count
a count of all of the component leads (or pins)
2 - Voltage
Voltage is a measure of the electric potential difference between two points in an electrical circuit. It is typically represented by the symbol "V" and is measured in volts. Voltage is a crucial parameter in electronic components as it determines the flow of electric current through a circuit. It is responsible for driving the movement of electrons from one point to another, providing the energy needed for electronic devices to function properly. In summary, voltage is a fundamental concept in electronics that plays a key role in the operation and performance of electronic components.
60V - Element Configuration
The distribution of electrons of an atom or molecule (or other physical structure) in atomic or molecular orbitals.
Single - Current
In electronic components, "Current" refers to the flow of electric charge through a conductor or semiconductor material. It is measured in amperes (A) and represents the rate at which electric charge is moving past a specific point in a circuit. Current is a crucial parameter in electronics as it determines the amount of power being consumed or delivered by a component. Understanding and controlling current is essential for designing and operating electronic circuits efficiently and safely. In summary, current is a fundamental electrical quantity that plays a key role in the functionality and performance of electronic components.
15A - Power Dissipation
the process by which an electronic or electrical device produces heat (energy loss or waste) as an undesirable derivative of its primary action.
115W - Case Connection
Case Connection refers to the method by which an electronic component's case or housing is connected to the electrical circuit. This connection is important for grounding purposes, mechanical stability, and heat dissipation. The case connection can vary depending on the type of component and its intended application. It is crucial to ensure a secure and reliable case connection to maintain the overall performance and safety of the electronic device.
COLLECTOR - Transistor Application
In the context of electronic components, the parameter "Transistor Application" refers to the specific purpose or function for which a transistor is designed and used. Transistors are semiconductor devices that can amplify or switch electronic signals and are commonly used in various electronic circuits. The application of a transistor can vary widely depending on its design and characteristics, such as whether it is intended for audio amplification, digital logic, power control, or radio frequency applications. Understanding the transistor application is important for selecting the right type of transistor for a particular circuit or system to ensure optimal performance and functionality.
SWITCHING - Gain Bandwidth Product
The gain–bandwidth product (designated as GBWP, GBW, GBP, or GB) for an amplifier is the product of the amplifier's bandwidth and the gain at which the bandwidth is measured.
3MHz - Polarity/Channel Type
In electronic components, the parameter "Polarity/Channel Type" refers to the characteristic that determines the direction of current flow or the type of signal that can be accommodated by the component. For components like diodes and transistors, polarity indicates the direction in which current can flow through the component, such as forward bias or reverse bias for diodes. For components like MOSFETs or JFETs, the channel type refers to whether the component is an N-channel or P-channel device, which determines the type of charge carriers that carry current through the component. Understanding the polarity or channel type of a component is crucial for proper circuit design and ensuring that the component is connected correctly to achieve the desired functionality.
NPN - Transistor Type
Transistor type refers to the classification of transistors based on their operation and construction. The two primary types are bipolar junction transistors (BJTs) and field-effect transistors (FETs). BJTs use current to control the flow of current, while FETs utilize voltage to control current flow. Each type has its own subtypes, such as NPN and PNP for BJTs, and MOSFETs and JFETs for FETs, impacting their applications and characteristics in electronic circuits.
NPN - Collector Emitter Voltage (VCEO)
Collector-Emitter Voltage (VCEO) is a key parameter in electronic components, particularly in transistors. It refers to the maximum voltage that can be applied between the collector and emitter terminals of a transistor while the base terminal is open or not conducting. Exceeding this voltage limit can lead to breakdown and potential damage to the transistor. VCEO is crucial for ensuring the safe and reliable operation of the transistor within its specified limits. Designers must carefully consider VCEO when selecting transistors for a circuit to prevent overvoltage conditions that could compromise the performance and longevity of the component.
60V - Max Collector Current
Max Collector Current is a parameter used to specify the maximum amount of current that can safely flow through the collector terminal of a transistor or other electronic component without causing damage. It is typically expressed in units of amperes (A) and is an important consideration when designing circuits to ensure that the component operates within its safe operating limits. Exceeding the specified max collector current can lead to overheating, degradation of performance, or even permanent damage to the component. Designers must carefully consider this parameter when selecting components and designing circuits to ensure reliable and safe operation.
15A - DC Current Gain (hFE) (Min) @ Ic, Vce
The parameter "DC Current Gain (hFE) (Min) @ Ic, Vce" in electronic components refers to the minimum value of the DC current gain, denoted as hFE, under specific operating conditions of collector current (Ic) and collector-emitter voltage (Vce). The DC current gain hFE represents the ratio of the collector current to the base current in a bipolar junction transistor (BJT), indicating the amplification capability of the transistor. The minimum hFE value at a given Ic and Vce helps determine the transistor's performance and efficiency in amplifying signals within a circuit. Designers use this parameter to ensure proper transistor selection and performance in various electronic applications.
20 @ 4A 4V - Current - Collector Cutoff (Max)
The parameter "Current - Collector Cutoff (Max)" refers to the maximum current at which a transistor or other electronic component will cease to conduct current between the collector and emitter terminals. This parameter is important in determining the maximum current that can flow through the component when it is in the cutoff state. Exceeding this maximum cutoff current can lead to malfunction or damage of the component. It is typically specified in the component's datasheet and is crucial for proper circuit design and operation.
700μA - Vce Saturation (Max) @ Ib, Ic
The parameter "Vce Saturation (Max) @ Ib, Ic" in electronic components refers to the maximum voltage drop across the collector-emitter junction when the transistor is in saturation mode. This parameter is specified at a certain base current (Ib) and collector current (Ic) levels. It indicates the minimum voltage required to keep the transistor fully conducting in saturation mode, ensuring that the transistor operates efficiently and does not enter the cutoff region. Designers use this parameter to ensure proper transistor operation and to prevent overheating or damage to the component.
3V @ 3.3A, 10A - Transition Frequency
Transition Frequency in electronic components refers to the frequency at which a device can transition from one state to another, typically defining the upper limit of its operating frequency. It is a critical parameter in determining the speed and performance of active components like transistors and integrated circuits. This frequency is influenced by factors such as capacitance, resistance, and the inherent characteristics of the materials used in the component's construction. Understanding transition frequency is essential for optimizing circuit designs and ensuring reliable signal processing in various applications.
3MHz - Max Breakdown Voltage
The "Max Breakdown Voltage" of an electronic component refers to the maximum voltage that the component can withstand across its terminals before it breaks down and allows current to flow uncontrollably. This parameter is crucial in determining the operating limits and safety margins of the component in a circuit. Exceeding the maximum breakdown voltage can lead to permanent damage or failure of the component. It is typically specified by the manufacturer in datasheets to guide engineers and designers in selecting the appropriate components for their applications.
100V - Collector Base Voltage (VCBO)
Collector Base Voltage (VCBO) is the maximum allowable voltage that can be applied between the collector and base terminals of a bipolar junction transistor when the emitter is open. It is a critical parameter that determines the voltage rating of the transistor and helps prevent breakdown in the collector-base junction. Exceeding this voltage can lead to permanent damage or failure of the component.
100V - Emitter Base Voltage (VEBO)
Emitter Base Voltage (VEBO) is a parameter used in electronic components, particularly in transistors. It refers to the maximum voltage that can be applied between the emitter and base terminals of a transistor without causing damage to the device. Exceeding this voltage limit can lead to breakdown of the transistor and potential failure. VEBO is an important specification to consider when designing circuits to ensure the proper operation and reliability of the components. It is typically provided in the datasheet of the transistor and should be carefully observed to prevent any potential damage during operation.
7V - VCEsat-Max
VCEsat-Max refers to the maximum collector-emitter saturation voltage of a bipolar junction transistor (BJT) or an insulated gate bipolar transistor (IGBT). It is a crucial parameter that indicates the minimum voltage drop across the collector-emitter junction when the transistor is in saturation mode. This parameter is important for determining the efficiency and performance of the transistor in switching applications. A lower VCEsat-Max value indicates better performance and reduced power losses in the transistor during operation. Designers often consider this parameter when selecting transistors for applications where minimizing power dissipation is critical.
3 V - Height8.7mm
- Length39.5mm
- Width26.2mm
- REACH SVHC
The parameter "REACH SVHC" in electronic components refers to the compliance with the Registration, Evaluation, Authorization, and Restriction of Chemicals (REACH) regulation regarding Substances of Very High Concern (SVHC). SVHCs are substances that may have serious effects on human health or the environment, and their use is regulated under REACH to ensure their safe handling and minimize their impact.Manufacturers of electronic components need to declare if their products contain any SVHCs above a certain threshold concentration and provide information on the safe use of these substances. This information allows customers to make informed decisions about the potential risks associated with using the components and take appropriate measures to mitigate any hazards.Ensuring compliance with REACH SVHC requirements is essential for electronics manufacturers to meet regulatory standards, protect human health and the environment, and maintain transparency in their supply chain. It also demonstrates a commitment to sustainability and responsible manufacturing practices in the electronics industry.
No SVHC - Radiation Hardening
Radiation hardening is the process of making electronic components and circuits resistant to damage or malfunction caused by high levels of ionizing radiation, especially for environments in outer space (especially beyond the low Earth orbit), around nuclear reactors and particle accelerators, or during nuclear accidents or nuclear warfare.
No - RoHS Status
RoHS means “Restriction of Certain Hazardous Substances” in the “Hazardous Substances Directive” in electrical and electronic equipment.
ROHS3 Compliant - Lead Free
Lead Free is a term used to describe electronic components that do not contain lead as part of their composition. Lead is a toxic material that can have harmful effects on human health and the environment, so the electronics industry has been moving towards lead-free components to reduce these risks. Lead-free components are typically made using alternative materials such as silver, copper, and tin. Manufacturers must comply with regulations such as the Restriction of Hazardous Substances (RoHS) directive to ensure that their products are lead-free and environmentally friendly.
Lead Free
How to use 2N3055
As mentioned, the 2N3055 can be used for any NPN transistor application, but to understand how the device works, let's consider a simple application circuit as shown below.

Here we use 2N3055 as a simple switching device to drive a motor and in a common emitter configuration. As shown in the circuit, we are using a motor as the load and the gate signal to turn on the transistor is provided by a 5V source with a button as the trigger device.
The trigger source and current source must share a common ground for the circuit to work. The 100 resistors are used to limit the current through the base. Under initial conditions, the button is open and no current flows through the base of the transistor.
With no base current, the transistor acts as an open circuit and the entire supply voltage V1 appears across it. When the button is pressed at a certain moment, the voltage V2 forms a closed loop with the base-emitter of the transistor as can be seen in the circuit diagram. In this closed loop, a current flows through the base of the transistor, and with the base current flow, the transistor is turned on.
When a transistor acts as a short circuit in the ON state, a collector current flows through the motor, causing it to rotate. This motor will continue to rotate until a base current is present. After a certain time, when the button is released, the base current becomes zero and the transistor turns off. When the transistor enters a high-impedance state in the OFF mode, the collector current also becomes zero, which causes the motor to stop.
The way of controlling the power motor via a simple push button realizes the use of 2N3055 as a switching device and in the same way, we can use 2N3055 in other transistor circuits.
2N3055 Manufacturer
STMicroelectronics is a global independent semiconductor company and is a leader in developing and delivering semiconductor solutions across the spectrum of microelectronics applications. An unrivaled combination of silicon and system expertise, manufacturing strength, Intellectual Property (IP) portfolio, and strategic partners positions the Company at the forefront of System-on-Chip (SoC) technology, and its products play a key role in enabling today's convergence trends.
2N3055 Package

2N3055 vs TIP3055
The electrical properties of both the TIP3055 and 2N3055 transistors are the same, however, the 2N3055 metal has a slightly greater ability to dissipate heat due to its packaging. This means that the metallic type is also displayed for an assembly where the transistor is working at its limit. Also, note that 2N3055 comes in light aluminum cases and heavy metal cases. Heavy envelopes are better as they also give off more heat. In an application such as power supplies, metal is the most recommended.
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Datasheet PDF
- Datasheets :
Parts with Similar Specs
What is TIP3055 transistor?
TIP3055 is a silicon epitaxial-ignoble NPN transistor, which is assembled in TO-218 malleable parcels. It is the best device for power swapping circuits, parallel and series controllers (regulators), output phases, and high-power amplifiers. Its corresponding PNP transistor is TIP2955.
What is 2N3055 used for?
The 2N3055 transistor is used as a series pass transistor within linear power supplies and is also used in high-power and medium-current circuits like DC to AC inverters, low-frequency power converters, and audio power amplifiers.
Whats is a transistor?
A transistor is a miniature semiconductor that regulates or controls current or voltage flow in addition to amplifying and generating these electrical signals and acting as a switch/gate for them.
Are NPN and PNP transistors interchangeable?
NPN and PNP transistors are interchangeable if you remember one simple rule: A bipolar transistor is essentially two back-to-back diodes with the base being the common connection.
How many types of power transistors are there?
Transistors are broadly divided into three types: bipolar transistors (bipolar junction transistors: BJTs), field-effect transistors (FETs), and insulated-gate bipolar transistors (IGBTs).
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