BC107 Transistor: Pinout, Equivalent and Datasheet
STMICROELECTRONICS BC107Bipolar (BJT) Single Transistor, NPN, 45 V, 300 mW, 100 mA, 120









STMICROELECTRONICS BC107Bipolar (BJT) Single Transistor, NPN, 45 V, 300 mW, 100 mA, 120
Hi, fellas. Welcome back to the new post today. BC107 is a low-power NPN bipolar junction transistor, which is packaged in a TO-18 metal can. This article mainly introduces pinout, equivalent, datasheet, and other detailed information about STMicroelectronics BC107.

KiCad tutorial 2: Amplitude modulation circuit using transistor bc107
BC107 Description
BC107 is a low-power NPN bipolar junction transistor, which is packaged in a TO-18 metal can. It is mainly designed for general switching and amplification purposes. It is mainly composed of three terminals, which are called emitter, base, and collector.
As a current control device, the small current on the base side is used to control the large current on the emitter and collector sides. When a voltage is applied to the base terminal, it will be biased and draw current and begin to control the large current on the emitter and collector sides.
The movement of electrons plays an important role in the conductivity of any transistor. BC107 is a bipolar junction transistor in which conductivity is achieved by two charge carriers including electrons and holes, but most of the charge carriers are electrons.
The free movement of electrons is like a bridge between the emitter and the collector. The emitter emits electrons, which are then collected by the collector. Bases are used to control the number of electrons. Since it is an NPN transistor, the base is extremely positive relative to the emitter.
The function and doping concentration of the emitter, base, and collector are different. Compared with the base and collector, the emitter is highly doped. And the voltage on the collector side is much greater than the base voltage. When two diodes are connected back to back, they form a bipolar junction transistor.
BC107 Pinout
It is mainly composed of three terminals, which are called 1. base 2. Emitter and 3. collector.

BC107 Pinout
| Pin Number | Pin Name | Description |
| 1 | Base | Controls the biasing of the transistor, Used to turn ON or OFF the transistor |
| 2 | Emitter | Current Drains out through emitter, normally connected to ground |
| 3 | Collector | Current flows in through collector, normally connected to load |
BC107 Pin Description
BC107 CAD Model

Symbol

Footprint
BC107 Features
●Small Signal NPN Transistor
●Current Gain (hFE): 450 (maximum)
●Continuous Collector current (IC) is 100mA
●Collector-Emitter voltage (VCEO) is 45V
●Collector-Base voltage (VCB0) is 50V
●Emitter Base Voltage (VBE0) is 6V
●Available in To-18 Metal can Package
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.
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.
Through Hole - Contact Plating
Contact plating (finish) provides corrosion protection for base metals and optimizes the mechanical and electrical properties of the contact interfaces.
Tin - Package / Case
refers to the protective housing that encases an electronic component, providing mechanical support, electrical connections, and thermal management.
TO-206AA, TO-18-3 Metal Can - Number of Pins3
- 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 - Number of Elements1
- Collector-Emitter Breakdown Voltage45V
- Collector-Emitter Saturation Voltage600mV
- hFEMin200
- 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.
175°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.
Tube - 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 - 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 Terminations3
- Termination
Termination in electronic components refers to the practice of matching the impedance of a circuit to prevent signal reflections and ensure maximum power transfer. It involves the use of resistors or other components at the end of transmission lines or connections. Proper termination is crucial in high-frequency applications to maintain signal integrity and reduce noise.
Through Hole - 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 - 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 - Max Power Dissipation
The maximum power that the MOSFET can dissipate continuously under the specified thermal conditions.
300mW - 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 - Peak Reflow Temperature (Cel)
Peak Reflow Temperature (Cel) is a parameter that specifies the maximum temperature at which an electronic component can be exposed during the reflow soldering process. Reflow soldering is a common method used to attach electronic components to a circuit board. The Peak Reflow Temperature is crucial because it ensures that the component is not damaged or degraded during the soldering process. Exceeding the specified Peak Reflow Temperature can lead to issues such as component failure, reduced performance, or even permanent damage to the component. It is important for manufacturers and assemblers to adhere to the recommended Peak Reflow Temperature to ensure the reliability and functionality of the electronic components.
NOT SPECIFIED - 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.
100mA - Time@Peak Reflow Temperature-Max (s)
Time@Peak Reflow Temperature-Max (s) refers to the maximum duration that an electronic component can be exposed to the peak reflow temperature during the soldering process, which is crucial for ensuring reliable solder joint formation without damaging the component.
NOT SPECIFIED - 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.
BC107 - Pin Count
a count of all of the component leads (or pins)
3 - Qualification Status
An indicator of formal certification of qualifications.
Not Qualified - 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.
300mW - 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.
AMPLIFIER - 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.
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.
100mA - 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.
110 @ 2mA 5V - 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.
15nA ICBO - 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.
600mV @ 5mA, 100mA - 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.
150MHz - 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.
6V - Height5.3mm
- Length5.8mm
- Width5.8mm
- 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.
ROHS3 Compliant
BC107 Alternatives
| Part Number | Description | Manufacturer |
| JANTXV2N5581TRANSISTORS | Small Signal Bipolar Transistor, 0.8A I(C), 50V V(BR)CEO, 1-Element, NPN, Silicon, TO-46, HERMETIC SEALED, METAL CAN-3 | Semicoa Semiconductors |
| 2N706TRANSISTORS | Small Signal Bipolar Transistor, 0.05A I(C), 15V V(BR)CEO, 1-Element, NPN, Silicon, TO-18, TO-18, 3 PIN | Microsemi Corporation |
| 2N2369ZTRANSISTORS | 15V, NPN, Si, SMALL SIGNAL TRANSISTOR, TO-18 | STMicroelectronics |
| BCW65ALT1TRANSISTORS | Small Signal Bipolar Transistor, 0.8A I(C), 32V V(BR)CEO, 1-Element, NPN, Silicon, TO-236AB | Motorola Semiconductor Products |
| MPSL51TRETRANSISTORS | Small Signal Bipolar Transistor, 100V V(BR)CEO, 1-Element, PNP, Silicon, TO-92, | Central Semiconductor Corp |
| MPSL51/D27ZTRANSISTORS | 600mA, PNP, Si, SMALL SIGNAL TRANSISTOR, TO-92 | Texas Instruments |
| BCW65ATRTRANSISTORS | Small Signal Bipolar Transistor, 32V V(BR)CEO, 1-Element, NPN, Silicon, | Central Semiconductor Corp |
| MPSL51/D75ZTRANSISTORS | 600mA, PNP, Si, SMALL SIGNAL TRANSISTOR, TO-92 | Texas Instruments |
| BCW65ATR13LEADFREETRANSISTORS | Small Signal Bipolar Transistor, 32V V(BR)CEO, 1-Element, NPN, Silicon, | Central Semiconductor Corp |
| MPSL51TRELEADFREETRANSISTORS | Small Signal Bipolar Transistor, 100V V(BR)CEO, 1-Element, PNP, Silicon, TO-92, | Central Semiconductor Corp |
Where to use BC107?
The BC107 is a low signal NPN that is known for its low noise operations making it famously used in signal processing circuits and television receivers. The transistor is still available in the market due to its legacy but you will find better modern transistors as replacements for BC107.
BC107 Equivalent
BC107 Absolute Maximum Ratings
| Symbol | Parameter | Value | Unit |
| VCBO | Collector-Base Voltage (IE = 0) | 50 | V |
| VCEO | Collector-Emitter Voltage (IB = 0) | 45 | V |
| VEBO | Emitter-Base Voltage (IC = 0) | 6 | V |
| IC | Collector Current | 100 | mA |
| Ptot | Total Dissipation at Tamb ≤ 25 oC /at TC ≤ 25 oC | 0.3/0.75 | W/W |
| Tstg | Storage Temperature | -55 to 175 | °C |
| Tj | Max. Operating Junction Temperature | 175 | °C |
BC107 Applications
●Used in driver modules like relay driver, LED driver, etc.
●Used in amplifier modules like audio amplifiers, signal amplifiers, etc.
●Used in Darlington pair
●Used in signal processing
●Used in power management
●Used in portable devices
●Used in consumer electronics
●Used for industrial purpose
BC107 Mechanical Data
BC107 Mechanical Data
BC107 Manufacturer
STMicroelectronics is a French-Italian multinational electronics and semiconductor manufacturer, headquartered in Plan-les-Ouates near Geneva, Switzerland. The company originated from the merger of two state-owned semiconductor companies in 1987: "Thomson Semiconducteurs" in France and "SGS Microelettronica" in Italy. It is often referred to as "ST" and is the largest semiconductor chip manufacturer in Europe by revenue.
STMicroelectronics corporate headquarters and EMEA regional headquarters are located in Geneva, while the holding company STMicroelectronics N.V. is incorporated in the Netherlands. The company's US headquarters are located in Koper, Texas. The Asia-Pacific region is headquartered in Singapore, while the Japan and South Korea operations are headquartered in Tokyo. The headquarter of the company in China is located in Shanghai.
Datasheet PDF
- Datasheets :
1.What does BC in BC107 stands for?
B-stands for Silicon Transistor C for- Audio Frequency Range.
2.Is BC107 the same as BC547?
The BC547 and BC107 are both NPN bipolar transistors.BC547 is a modern replacement for the BC107. They are packaged differently but otherwise look very similar in terms of electrical characteristics. They have the same breakdown voltage; the BC547 has a slightly better cutoff frequency. The current gain has a very similar range. This means that it could most likely replace the BC107 one-for-one aboard.
3.What does the numerals 107 stand for in BC107?
107 refers to the serial number, which helps to identify the parameters in the datasheet
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