BC337 NPN Transistor: Pinout, Datasheet, and Equivalents
TRANS NPN 45V 0.8A TO-92
The BC337 is an NPN transistor commonly used in low power amplifier circuits.

LED Water Level Indicator with BC337
BC337 Description
The BC337 is an NPN transistor commonly used in low power amplifier circuits. The BC337 can provide a maximum gain (hFE) of 630, a high collector current of up to 800mA, a decent collector-emitter voltage of 45V, and the base trigger voltage is only 5V. This makes the BC337 suitable for many general-purpose switching circuits. Due to its low base trigger voltage, it can be easily controlled by digital circuits like microcontroller circuits. It can be replaced by 2N2222 in switching loads applications.
BC337 Pinout


BC337 CAD Model
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3D Model

BC337 Features
Package Type: TO-92
Transistor Type: NPN
Continuous Collector Current(IC): 800 mA
Collector-Emitter Voltage (VCE): 45 V
Collector-Base Voltage (VCB): 50 V
Emitter-Base Voltage (VBE): 5 V
Collector Dissipation (Pc): 625 W
Transition Frequency (fT): 100 MHz
DC Current Gain (hFE): 100 - 630
Storage & Operating temperature: -55 to +150 Centigrade
BC337 Advantages
Advanced process technology
Low error voltage
Fast switching speed
Full-voltage operation
High power and current handling capability
Specifications
- TypeParameter
- Lifecycle Status
Lifecycle Status refers to the current stage of an electronic component in its product life cycle, indicating whether it is active, obsolete, or transitioning between these states. An active status means the component is in production and available for purchase. An obsolete status indicates that the component is no longer being manufactured or supported, and manufacturers typically provide a limited time frame for support. Understanding the lifecycle status is crucial for design engineers to ensure continuity and reliability in their projects.
LAST SHIPMENTS (Last Updated: 4 days ago) - Contact Plating
Contact plating (finish) provides corrosion protection for base metals and optimizes the mechanical and electrical properties of the contact interfaces.
Copper, Silver, Tin - 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.
Through Hole - Package / Case
refers to the protective housing that encases an electronic component, providing mechanical support, electrical connections, and thermal management.
TO-92 - Number of Pins3
- Weight200mg
- Collector-Emitter Breakdown Voltage45V
- Collector-Emitter Saturation Voltage700mV
- Frequency(Max)100MHz
- Number of Elements1
- Power Dissipation (Max)625mW
- hFEMin100
- 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.
Bulk - Published2009
- Max Operating Temperature
The Maximum Operating Temperature is the maximum body temperature at which the thermistor is designed to operate for extended periods of time with acceptable stability of its electrical characteristics.
150°C - Min Operating Temperature
The "Min Operating Temperature" parameter in electronic components refers to the lowest temperature at which the component is designed to operate effectively and reliably. This parameter is crucial for ensuring the proper functioning and longevity of the component, as operating below this temperature may lead to performance issues or even damage. Manufacturers specify the minimum operating temperature to provide guidance to users on the environmental conditions in which the component can safely operate. It is important to adhere to this parameter to prevent malfunctions and ensure the overall reliability of the electronic system.
-55°C - 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.
45V - 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.
800mA - Frequency
In electronic components, the parameter "Frequency" refers to the rate at which a signal oscillates or cycles within a given period of time. It is typically measured in Hertz (Hz) and represents how many times a signal completes a full cycle in one second. Frequency is a crucial aspect in electronic components as it determines the behavior and performance of various devices such as oscillators, filters, and communication systems. Understanding the frequency characteristics of components is essential for designing and analyzing electronic circuits to ensure proper functionality and compatibility with other components in a system.
210MHz - Polarity
In electronic components, polarity refers to the orientation or direction in which the component must be connected in a circuit to function properly. Components such as diodes, capacitors, and LEDs have polarity markings to indicate which terminal should be connected to the positive or negative side of the circuit. Connecting a component with incorrect polarity can lead to malfunction or damage. It is important to pay attention to polarity markings and follow the manufacturer's instructions to ensure proper operation of electronic components.
NPN - Element Configuration
The distribution of electrons of an atom or molecule (or other physical structure) in atomic or molecular orbitals.
Single - 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.
625mW - 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.
210MHz - 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.
45V - 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.
800mA - Frequency - Transition
The parameter "Frequency - Transition" in electronic components refers to the maximum frequency at which a signal transition can occur within the component. It is a crucial specification for digital circuits as it determines the speed at which data can be processed and transmitted. A higher frequency transition allows for faster operation and better performance of the electronic component. It is typically measured in hertz (Hz) or megahertz (MHz) and is specified by the manufacturer to ensure proper functioning of the component within a given frequency range.
100MHz - 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.
50V - 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.
5V - Height4.58mm
- Length4.58mm
- Width3.86mm
- 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 - RoHS Status
RoHS means “Restriction of Certain Hazardous Substances” in the “Hazardous Substances Directive” in electrical and electronic equipment.
RoHS 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
BC337 Functional Alternatives

BC337 Equivalents
2N7051, BC338, BC487, 2N2222, 2N3904, 2N4404
BC337 PNP Complementary
Where to use BC337
The BC337 can be used in a variety of electronic circuits and projects. Due to its high maximum characteristics, you can use it in small audio amplification stages and at the output stage of low power audio amplifiers, its high gain feature also allows it to be used in audio preamplifier stages. Besides that, it can also be used to switch small loads in electronic circuits, such as switching ON another part in an electronic circuit, switch ON and OFF LEDs, relays, bulbs, and any type of load under 800mA.
BC337 Applications
Audio frequency driver stages
Low power audio amplifiers
General-purpose switching
Amplifying low gain signals to high gain
Output stage amplifier
Darlington pair
BC337 Package

BC337 Manufacturer
ON Semiconductor (Nasdaq: ON) is driving energy efficient innovations, empowering customers to reduce global energy use. The company offers a comprehensive portfolio of energy efficient power and signal management, logic, discrete and custom solutions to help design engineers solve their unique design challenges in automotive, communications, computing, consumer, industrial, LED lighting, medical, military/aerospace and power supply applications. ON Semiconductor operates a responsive, reliable, world-class supply chain and quality program, and a network of manufacturing facilities, sales offices and design centers in key markets throughout North America, Europe, and the Asia Pacific regions.
Trend Analysis
Datasheet PDF
- ReachStatement :
- Datasheets :
1.What is a BC337 transistor?
A BC337 transistor is a three-terminal current control device used for general purposes. Based on the semiconductor type used, the BC337 transistor is a negative-positive-negative (NPN) type because the main terminals use a negative (N)-type material.
2.How does BC337 work?
The base terminal in the BC337 plays a key role in starting the overall transistor action. When the voltage is applied at the base side, it gets biased and starts the electron action in the transistor. The base side actually acts like a control value that controls the electrons emitting from the emitter terminal which are then collected by the collector side. The small current at the base terminal is used to control the large current at the remaining two terminals. This process is used for amplification purposes.
3.How to safely long run BC337 in a circuit?
To safely run this transistor in your circuit for the long term, do not operate it directly in circuits that use more than 45V. Also, use a suitable resistor base resistor to limit its base current to the required level. The maximum temperature in which this transistor can survive is from -55 to +150 centigrade so do not expose it in the temperature below -55 centigrade and above +150 centigrade.
4.BC337 vs. BC547?
BC547 and BC337 are both general-purpose NPN transistors with the same ebc configuration but a slight difference in current. 547 can handle up to 500 mA current with a power dissipation up to 625 mW, while in the case of 337 it can handle up to 800 mA with a power dissipation of 1.5W so it can be used in somewhat more power handling locations than 547.
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