The maximum operating temperature range for the BC549C is -55°C to 150°C.
Yes, the BC549C can be used as a switch, but it's not recommended due to its relatively low current gain (hFE) and high saturation voltage (VCE(sat)). A dedicated switch transistor like the 2N3904 or 2N4401 would be a better choice.
The choice of resistor values depends on the specific application and the desired current and voltage levels. A good starting point is to use the transistor's datasheet values and then adjust based on the specific circuit requirements.
The maximum collector current (IC) that the BC549C can handle is 100 mA.
The BC549C is not suitable for high-frequency applications due to its relatively low transition frequency (fT) of 300 MHz. A transistor with a higher fT, such as the 2N3904, would be a better choice.
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