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Transistor NPN bc 107

🛠️ NPN Transistor – BC107 (TO‑18 Metal Can)

Overview

The BC107 is a low-noise, general-purpose NPN transistor housed in a TO‑18 metal can package. Suited for audio amplifiers, signal switching, and sensor circuits, it’s favored for its superior frequency response and relatively high gain.

Key Features

  • Collector current: up to 100 mA

  • Collector–Emitter voltage (V<sub>CEO</sub>): 45 V

  • Low noise – ideal for audio and signal applications

  • DC current gain (h<sub>FE</sub>): typically 110–450, depending on variant (A/B/C)

  • Transition frequency (fₜ): ~150 MHz

  • Compact TO‑18 metal can package

Technical Specifications

ParameterValue
V<sub>CEO</sub>45 V
V<sub>CBO</sub>50 V total collector-base voltage
V<sub>EBO</sub>6 V max emitter-base voltage
Collector Current (IC)100 mA continuous
Power Dissipation300 mW (ambient); 750 mW (case)
DC Current Gain (h<sub>FE</sub>)110–450 at IC = 2 mA
Frequency (f<sub>t</sub>)~150 MHz
PackageTO‑18 metal can (pins E, B, C)

Pinout (Looking at flat face, leads down):

  1. Emitter

  2. Base

  3. Collector

Typical Wiring – Arduino LED Switch

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Arduino GPIO → 1 kΩ resistor → Base  
Emitter → GND  
Collector → LED → +5 V

Use a flyback diode for inductive loads like relays. This setup allows control of the LED using simple Arduino commands (digitalWrite() or analogWrite()).

Applications

  • Audio pre-amplifiers and sensors

  • Switching small loads and driving LEDs

  • Signal amplification

  • Oscillator and timing circuits

  • General low-power electronic circuits

✅ Resources


  2. 🎥 YouTube Tutorial: https://youtu.be/YlXNXwAOZ3U?si=tDcc_M8HP14eO5hQ


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