BC548 is an NPN epitaxial silicon transistor. It is mostly used for current amplification and switching. It has three terminals namely emitter, base, and collector. The amount of current flowing from base to the emitter controls the amount of the current flowing through the collector. BC548 has a gain value of 110 to 800. For the transistor in the saturation region, the maximum collector current is 100mA when the base current is limited to 5mA.
Typically voltages allowed across the collector-emitter(VCE) are 200mV and across base-emitter(VBE) is 900mV. For the transistor in the cutoff region, the voltage across base-emitter(VBE) is around 660mV.
BC548 Transistor Pinout
| PIN NUMBER | PIN NAME |
| 1 | Collector |
| 2 | Base |
| 3 | Emitter |
Features and specifications:
- Transistor type: Bi-Polar NPN epitaxial silicon transistor
- DC Current Gain (hFE):110-800
- Collector current (IC): 100mA
- Collector Base Voltage (VCB): 30 V
- Collector-Emitter voltage (VCE): 30V
- Emitter Base Voltage (VEB): 5V
- Maximum Power dissipation: 500mW
- Junction temperature: 150⁰C
- Current gain-bandwidth product: 300MHz
- Noise figure: 10 dB
- Available in TO-92 Package
Applications and uses:
- Current amplification
- Switch
- Pulse width modulation
- Darlington pair
- Driver module
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