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The BC548 is a general-purpose NPN bipolar junction transistor commonly used in electronic equipment. It is notably often the first type of bipolar transistor hobbyists encounter, and is often featured in designs in hobby electronics magazines where a general-purpose transistor is required.
The BC548 is the modern plastic-packaged BC108 and can be used in any circuit designed for the BC108 or BC148, which includes many Mullard and Philips published designs.
*Breakdown voltage, collector-to-emitter with base open-circuit VCEO = 30 V (see below) *Rated continuous collector current IC = 100 mA (Fairchild's BC548 at one time had a higher rating) *Rated total power dissipation Ptotal = 500 mW (some manufacturers may specify 625 mW - see below) *Transition frequency (gain-bandwidth product) ft = 150 MHz minimum (300 MHz typical)