BC548B (10 pcs) 30V 100mA NPN Transistor - Free & Fast shipping

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$3.65
Model
BC548B
Brand
Unbranded
condition
New

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      The BC548B is a NPN bipolar junction transistor (BJT) that is widely used for general-purpose switching and amplification applications in low to medium power electronic circuits. It is designed for low current handling but provides excellent performance in controlling small signal and low-power devices.

      Key Features:

      • Type: NPN transistor
      • Collector-Emitter Voltage (Vce): 30V (maximum)
      • Collector Current (Ic): 100mA (maximum)
      • Power Dissipation: 500mW (maximum)
      • Current Gain (hFE): Typically between 110 and 800, depending on the specific model.

      How It Works:

      1. Switching Applications:
        The BC548B can be used as a switch in digital circuits. When a small current is applied to the base, the transistor allows a larger current to flow from the collector to the emitter. This makes it useful in controlling low-power devices, such as turning on LEDs, relays, or small motors.

      2. Amplification Applications:
        The BC548B can amplify weak input signals in audio circuits or signal processing applications. It acts as a signal amplifier by controlling the current flowing from the collector to the emitter based on the input signal applied to the base.

      3. Current Control:
        The transistor works by controlling the flow of current through the collector-emitter path when a small current is applied to the base. This allows it to act as both a switch (to control larger currents) or as an amplifier (to increase the strength of weak signals).

      Pin Configuration:

      1. Collector (C): The output terminal, typically connected to the load or the higher voltage side of the circuit.
      2. Base (B): The input terminal, where a small current is applied to control the operation of the transistor. A current-limiting resistor is usually placed here.
      3. Emitter (E): The reference terminal, typically connected to ground in most circuits.

      Example Circuits:

      1. Switching a Load (e.g., LED):

        • The base is connected to a control signal, such as from a microcontroller, through a current-limiting resistor (e.g., 1kΩ).
        • The collector is connected to the negative terminal of an LED, while the positive terminal is connected to a 5V supply.
        • When a signal is applied to the base, the transistor switches on, allowing current to flow through the LED and turning it on.

      2. Amplifying a Signal:

        • The base is driven by a weak signal (such as an audio signal).
        • The collector is connected to the load (e.g., a speaker or other output device).
        • The emitter is grounded, and the transistor amplifies the input signal, driving the load with more current.

      Key Notes:

      • The BC548B is best suited for low-power switching and signal amplification applications.
      • It is commonly used in relay-driving circuits, small motor control, and audio pre-amplifiers.
      • The current-limiting resistor at the base is essential to protect the transistor from excessive current and ensure proper operation.