BC857B RFG

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
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 (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce:	220 @ 2mA, 5V
Power - Max:	200mW
Frequency - Transition:	100MHz
Operating Temperature:	-55°C ~ 150°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	TO-236-3, SC-59, SOT-23-3
Supplier Device Package:	SOT-23

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Introduction

BC857B RFG is a single bipolar junction transistor (BJT). This type of transistor has been used for many applications in the past, including audio and power amplifier circuits. In this article, we will discuss the application fields and working principles of BC857B RFG.

Application fields

BC857B RFG is a versatile transistor with the ability to operate in the linear and switch modes. This makes it suitable for applications in different industries such as:

• Audio amplifier circuits: BC857B RFG can be used in audio amplifiers to improve the sound quality and increase the power output. This is especially useful for high-end audio systems.
• Power amplifiers: BC857B RFG can also be used in power amplifier circuits for improving their efficiency and for increasing the output power. This is especially useful for high-power applications like in television and theater sound systems.
• Power supply circuits: BC857B RFG can be used as a voltage regulator in power supply circuits. This makes it ideal for applications like computers, electronics, and many more.
• Automotive applications: BC857B RFG is also suitable for automotive applications such as in car radios and audio systems. This makes it perfect for modern vehicles.

Working principle

The BC857B RFG transistor is a NPN transistor. This means that when a positive potential is applied to the base connection, current will flow between the emitter and collector connections. This allows the transistor to amplify voltage and current, depending on the external components that are connected to it. The BC857B RFG transistor has a high frequency response and can operate in either linear or saturated modes. In the linear mode, the transistor operates in a region where the collector current is dependent on the base voltage, but the collector-emitter voltage is held constant. This is ideal for applications like audio amplifiers. In the saturated or switch mode, the transistor operates where the collector current is a function of the base current, not the base voltage, and the collector-emitter voltage is not held constant. This is more suitable for power amplifier circuits where the collector current must be higher than the emitter current and the collector-emitter voltage must switch between two levels.

Conclusion

BC857B RFG is a versatile, single bipolar junction transistor with a high frequency response. It can be used in different application fields, such as audio and power amplifier circuits and power supply circuits. Its working principle involves the flow of current between the emitter and collector terminals when a positive potential is applied to the base terminal. The BC857B RFG transistor can operate in either linear or saturated modes, depending on the application.

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