BC549 NPN Low Noise Transistor (5 Pcs)
₹19.00
- Full Name: BC549 NPN Low Noise Transistor
- Low-noise NPN transistor
- High DC current gain
- Suitable for low-level signal amplification
- Fast switching performance
- Compact TO-92 package
- Low power consumption
- Reliable and durable construction
- Easy to use in analog and digital circuits
The BC549 is a low-noise NPN Bipolar Junction Transistor (BJT) designed for low-signal amplification and general-purpose switching applications. It is widely used in audio preamplifiers, microphone amplifiers, sensor circuits, relay drivers, oscillators, and DIY electronics. Due to its excellent low-noise characteristics, the BC549 is commonly preferred over the BC548 in sensitive audio applications.
Features
- Full Name: BC549 NPN Low Noise Transistor
- Low-noise NPN transistor
- High DC current gain
- Suitable for low-level signal amplification
- Fast switching performance
- Compact TO-92 package
- Low power consumption
- Reliable and durable construction
- Easy to use in analog and digital circuits
Specifications
| Specification | Value |
|---|---|
| Product Type | NPN Bipolar Junction Transistor (BJT) |
| Model | BC549 |
| Package | TO-92 |
| Collector-Emitter Voltage (VCEO) | 30V |
| Collector-Base Voltage (VCBO) | 30V |
| Emitter-Base Voltage (VEBO) | 5V |
| Maximum Collector Current (IC) | 100mA |
| Maximum Power Dissipation | 500mW |
| DC Current Gain (hFE) | 110–800 (A/B/C gain groups) |
| Transition Frequency (fT) | Approx. 300 MHz |
| Operating Temperature | -55°C to +150°C |
Pin Configuration
When viewed from the flat side with the leads pointing downward:
| Pin | Function |
|---|---|
| 1 | Collector (C) |
| 2 | Base (B) |
| 3 | Emitter (E) |
Note: Some manufacturers may use a different lead arrangement. Always verify the datasheet of your specific BC549 before use.
Applications / Uses
- Audio preamplifier circuits
- Microphone amplifiers
- Signal amplification
- Relay driver circuits
- Sensor interface circuits
- Oscillator circuits
- Arduino and ESP32 projects
- Low-noise amplifier circuits
- Educational electronics
- DIY electronics projects
Advantages
- Very low noise performance
- High current gain
- Fast switching speed
- Compact TO-92 package
- Low power consumption
- Reliable operation
- Cost-effective
- Ideal for audio applications
Size
| Specification | Value |
|---|---|
| Package Type | TO-92 |
| Body Width | Approx. 4.5 mm |
| Body Height | Approx. 5 mm |
| Overall Height (with leads) | Approx. 14 mm |
| Lead Pitch | 1.27 mm |
| Weight | Approx. 0.3 g |
Package Includes
- 1 × BC549 NPN Low Noise Transistor (TO-92)
Note: The BC549 is optimized for low-noise audio and signal amplification applications. It has a maximum collector current of 100mA, making it suitable for low-power circuits. For higher-current applications such as motor or relay driving, use a power transistor like BD139, D882, or a suitable MOSFET. Always use an appropriate base resistor when interfacing with microcontrollers or logic circuits.
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