BC639 NPN Transistor: Pinout, Datasheet, and Equivalents

The BC639 is an NPN BJT transistor featuring a planar construction and manufactured in the TO-92 package. It can be used to amplify or switch electronic signals and electrical power. The collector current of the BC639 can be as high as 1 A due to which it can perform well when used as a switch to drive many loads at the same time. Also, with a max collector-emitter and collector-base voltages of 80V, you can easily drive a higher voltage load through the BC639.

On the other hand, the max collector dissipation of the BC639 is 625mW and the max DC current gain is 160 which also makes it ideal to use in audio amplifier stages and as a separate audio amplifier to drive a small 2-inch speaker directly.

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• Transistor Type: NPN

• Package Type: TO-92 (TO-226)

• Max Collector Current: 1 A

• Max Collector-Emitter Voltage: 80 V

• Max Collector-Base Voltage: 80 V

• Max Emitter-Base Voltage: 5 V

• Max Power Dissipation: 625 mW

• Transition Frequency: 200 MHz

• DC Current Gain (hFE): 40 - 160

• Storage & Operating temperature: -55 to +150 Centigrade

• Advanced process technology

• Low error voltage

• Fast switching speed

• Full-voltage operation

• High power and current handling capability

ON Semiconductor BC639 technical specifications, attributes, parameters and parts with similar specifications to ON Semiconductor BC639.

2N5551, 2N4401, BC337, BC537, BC538, 2N5833, 2N5550, 2N5831, 2N5832, 2SC2036, 2SC4145, BDB01D, 2N5830, 2N2405, MPSL01, 2N4410, 2N2222, ECG123AP, KSC1009C

Please check the pin configuration and parameters before replacing them in your circuit.

The BC639 can be used in many general-purpose switching and amplification applications. With its high collector current capabilities, you can use it to drive high current relays, high power transistors, DC motors, high power LEDs, etc. It can be used at the output of microcontrollers and other electronics platforms like Arduino and Raspberry pi to drive loads. It can also be used in audio amplifiers and their stages. The transition frequency of the BC639 is 200 MHz therefore it can also perform well when used in RF circuits under 200 MHz.

Everything begins with the base terminal. The electron reaction inside the BC639 is ignited when voltage is provided to the base pin. The number of electrons emitted by the emitter terminal is controlled by this base pin. The base pin serves as an electron valve and is responsible for the component's conductivity.

When the BC639 is used as an amplifier, the small current at the base terminal (which functions as an input current) is utilized to control a much greater electric current at both the emitter and collector terminals.

When used as a switch, it turns the little current flowing through one section of the transistor into a considerably larger current flowing through the remaining parts.

The collector voltage is always positive in relation to the emitter terminal, and the base pin is always positive in relation to the emitter terminal.

It's worth noting that the collector terminal is connected to the load voltage via a resistor, which restricts and controls the current flow.

• Sensor Circuits

• Audio Amplifier Circuits

• Audio Amplifier Stages

• Pre-Amplification Stages

• Linear Amplifier and Impedance Buffering

• Switching Loads under 500mA to 1000mA

• Transistor Darlington Pairs

• Radio Frequency Circuits

• Oscillator and Comparator Circuits

• Current Mirror and H-Bridge Circuits

• Astable and Bistable Multivibrator Circuits

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Download datasheets and manufacturer documentation for ON Semiconductor BC639.