This is one of the transistor types.
Part Number : BC548
Function : 500mA, 30V, NPN General Purpose Amplifier
Package : TO-92 Type
Manufactures : Fairchild Semiconductor
This post explains for the semiconductor BC548.
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Description :
This is 30V, 500mA, NPN General Purpose Amplifier.
This device is designed for use as general purpose amplifiers and switches requiring collector currents to 300 mA. Sourced from Process 10. See PN100A for characteristics.
Features :
1. Switching and Amplifier
2. High-Voltage : BC546, Vceo = 65V
3. Low-Noise : BC548, Vceo = 30V, BC549, BC550
BC548 Pinout
Absolute Maximum Ratings
1. Collector-Base Voltage : Vcbo = 30V
2. Collector-Emitter Voltage : Vceo = 30V
3. Emitter-Base Voltage : Vebo = 5V
4. Collector Current (DC) : Ic = 500mA
5. Total Device Dissipation : Pd = 625mW
6. Storage Junction Temperature Range : Tstg = -55 to 150°C
7. Operating Junction Temperature Range : Tj = -55 to 150°C
Other data sheets within the file : BC548A, BC548B, BC548C
BC548 Datasheet
