BC557B

Series:	--
Packaging:	Bulk
Part Status:	Obsolete
Transistor Type:	PNP
Current - Collector (Ic) (Max):	100mA
Voltage - Collector Emitter Breakdown (Max):	45V
Vce Saturation (Max) @ Ib, Ic:	650mV @ 5mA, 100mA
Current - Collector Cutoff (Max):	100nA
DC Current Gain (hFE) (Min) @ Ic, Vce:	180 @ 2mA, 5V
Power - Max:	625mW
Frequency - Transition:	320MHz
Operating Temperature:	-55°C ~ 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:	BC557

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The BC557B is an NPN replacement for the 2N390/2N391 family of General Purpose Amplifier transistors. The BC557B is a general-purpose single bipolar junction transistor (BJT) designed to be used in a broad range of applications such as amplifiers, switching circuits, and digital logic systems. A BC557B can be used in either a common-emitter, common-base, or common-collector configuration.The main components of the BC557B that make it a unique type of BJT include the collector, base, and emitter. The collector is the central node of a BJT and is a heavily doped region of the transistor. It receives the incoming signal from the base and amplifies it before sending it on to the output, or output load. The base is an electrostatically controlled point between the collector and the emitter. The base is also a lightly doped region of the transistor and determines how much current will go through the collector and emitter. Finally, the emitter is the output of the BC557B.The basic function of a transistor is to act as a switch, or amplifier, that can control the flow of current through the components of a circuit. The BC557B is a three-terminal device that works by varying the voltage applied to its base in order to vary the amount of current flowing through it. When the base voltage is increased, current will flow through the collector and emitter circuit, and when the base voltage is decreased, the current will not flow. The current gain of the BC557B is dependent on the control of the base current by the voltage applied to the base.The BC557B has several uses in the field of electronics. It is often used in switching circuits, amplifiers, oscillators, and logic circuits. The BC557B can also be used in pulse-width modulation control circuits and reverse-energy control applications. The BC557B has a low current gain, typically ranging from 30 to 160. This translates to relatively low power dissipation when used in switching and amplifier circuits, which can allow the device to be used in more space-sensitive applications.When using the BC557B in switch applications, two modes of operation are available: saturated (“on”) or cut-off (“off”). In saturated mode, the switch is closed and current flows through the transistor; in cut-off mode, the transistor is open and no current flows through it. The BC557B has a high saturation voltage and low cut-off voltage, making it an ideal choice for switching applications.The BC557B can also be used as an amplifier in circuits. It is commonly used in audio and RF amplifiers, audio mixers, and line drivers. In these applications, the transistor must be biased correctly in order to provide the right amount of amplification.In addition to its applications in switching and amplification, the BC557B is often used in oscillator circuits. It can be used in astable, monostable, and bistable multivibrator circuits. Oscillator circuits are circuits that use feedback signals to produce an output that oscillates back and forth between two different levels. The BC557B is particularly well-suited to oscillator applications because it has a low voltage gain, which helps keep the output oscillations stable.The BC557B is also useful in logic circuits, as it can be used to implement logic gates. Logic gates are circuits that output a digital signal (high or low voltage) depending on the voltage of the inputs. Common logic gates such as AND, OR, and NOT can be implemented using the BC557B.The BC557B is a versatile and dependable transistor that can be used in a wide variety of applications. With its high frequency performance and its ability to be biased correctly, it is an ideal choice for switching, amplification, and digital logic circuits. The BC557B is also a simple and reliable component that can be used in many different circuits, making it a popular choice with hobbyists and professionals alike.

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