BC548

Series:	--
Packaging:	Bulk
Part Status:	Obsolete
Transistor Type:	NPN
Current - Collector (Ic) (Max):	100mA
Voltage - Collector Emitter Breakdown (Max):	30V
Vce Saturation (Max) @ Ib, Ic:	600mV @ 5mA, 100mA
Current - Collector Cutoff (Max):	15nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce:	110 @ 2mA, 5V
Power - Max:	500mW
Frequency - Transition:	300MHz
Operating Temperature:	150°C (TJ)
Mounting Type:	Through Hole
Package / Case:	TO-226-3, TO-92-3 (TO-226AA)
Supplier Device Package:	TO-92-3
Base Part Number:	BC548

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BC548 is a widely used NPN bipolar junction transistor (BJT). It belongs to the small signal transistor family and creates a small current amplification between the collector and the emitter terminals. They can be used for switching and high frequency amplifying applications and can act as an electronic switch to control the flow of a current through a circuit. In this article, we will discuss its application field and working principles.In terms of its application field, the BC548 transistor is widely used in general-purpose amplifier circuits. It is also commonly used in digital circuits where small current amplifications are needed. It is suitable for applications such as driving speakers, transistors, LED and so on. The BC548 has three pins. It consists of collector, emitter and base pins. The base pin is used to provide current flow to the transistor. The collector pin receives the current from the base pin and the emitter pin releases the current to the external circuit. When the base pin is provided with a small current, the collector current will be amplified at the output.The working principle of the BC548 transistor is based on the phenomenon of "reverse biasing". This occurs when the base-emitter junction of the transistor is reverse biased. This reverse biasing in turn creates an electrostatic field between the collector and the base. When an electric field is applied, it creates an electric field in the depletion region between the collector and the base pin. This electric field, in turn, creates a potential barrier that prevents the flow of electrons from the collector to the base. When a small current is supplied to the base pin, a large current is received at the collector.The BC548 is a current-driven device, meaning that the voltage applied to the base has little impact on the output current. Therefore, the voltage applied to the base should be within a certain range in order to get an optimum performance from the transistor. This range is usually between 0.3 to 0.7V. If the base voltage is below 0.3V, the transistor will not be properly triggered, and the output current will be very small. On the other hand, if the base voltage exceeds 0.7V, the transistor can be damaged due to the excessive current.The BC548 transistor is also sensitive to temperature. It has a high thermal resistance, meaning that the output current can vary with ambient temperature. If the ambient temperature increases, the output current will decrease and the transistor can be damaged or burnt due to excessive current. Therefore, it is important to take proper precautions while using the BC548 transistor.The BC548 is a very popular and widely used transistor. Its small size, high speed and low cost make it very attractive. It is usually used in small-signal circuits, amplifiers and switching circuits. Its application field and working principles make it ideal for a variety of applications.The BC548 transistor is a valuable addition to any Arduino-based projects due to its small size, high speed and low cost. Thanks to its wide application field and high performance level, it is very popular among modern electronics.

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