BC548 is a general purpose NPN transistor, used in many electronics circuits like signal amplification and switching circuits. In this article sharing the Pinout, Characteristics and Equivalent transistors for replacement information’s.
What is BC548 Transistor?
It is a Bipolar junction transistor and comes with TO-92 plastics packaging. This NPN transistor is common transistor in audio signal processing and switching circuits. One P-type layer (the base) is sandwiched between two N-type layers (the emitter and the collector). The base is very thin and lightly doped, The emitter is heavily doped to release electrons and collector is collects those electrons.
Basic Information’s about BC548
| Parameter | Value / Description |
|---|---|
| Type | NPN BJT (Bipolar Junction Transistor) |
| Polarity | NPN |
| Package | TO-92 (plastic) |
| Typical Use | Low current, low voltage, general-purpose switching and amplification |
Characteristics of BC548
- Collector-Emitter Voltage (VCE max): 30 V
- Collector-Base Voltage (VCB max): 30 V
- Emitter-Base Voltage (VEB max): 5 V
- Maximum Collector Current (IC max): 100 mA
- Power Dissipation (Ptot): 500 mW
- DC Current Gain (hFE): 125 – 900 (depends on model grade: A/B/C)
- Transition Frequency (fT): ~150 MHz
BC548 Transistor Pinout Diagram
Equivalent Transistor For Replacement
- BC547 – Lower voltage version (45 V max)
- BC549 – Low noise version for audio applications
- 2N2222 – Similar NPN transistor with slightly higher current rating
Applications
- Signal amplification (e.g., in audio preamps)
- Switching small loads (e.g., LEDs, relays)
- Sensor signal processing
- Logic circuits
- General purpose low-power electronics circuits.
