BC857C,235

Series:	Automotive, AEC-Q101
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):	15nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce:	420 @ 2mA, 5V
Power - Max:	250mW
Frequency - Transition:	100MHz
Operating Temperature:	150°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	TO-236-3, SC-59, SOT-23-3
Supplier Device Package:	TO-236AB (SOT23)
Base Part Number:	BC857

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Introduction

BC857C,235 is a single-transistor made of a bipolar junction transistor (BJT). It is a popular component used in microelectronics and is mainly employed in a variety of switching, amplification, and controlling electronic circuits. This article will discuss the working principle and application field of the BC857C,235 transistor.

Working Principle

BJT transistors are composed of two P-N junctions connected back to back. Usually, one terminal is the emitter. The other two terminals are the collector and base. Depending on the polarity of the applied voltage, one of these junctions becomes forward biased, while the other one becomes reverse biased. When an external electric field is applied to the base, it is amplified from the emitter and then collected by the collector. When the base voltage is higher than the forward biased junction threshold voltage, the transistor will turn on the current flowing from the emitter to the collector. As a result, the current gain of the transistor will become high. In general, BJT transistors are classified into three types: npn, pnp, and resistive. The BC857C,235 is a field-effect transistor, which is a type of npn BJT. In normal circumstances, the base voltage is lower than the emitter voltage and collector voltage, making the current gain very high.

Application Field

The BC857C,235 is mainly used in microelectronic circuits. When it is used as a switch, due to its high current-carrying capacity, it can easily switch the current on and off. Moreover, it can also be used as an amplifier to amplify the input signals. Furthermore, it can also be used in controlling circuits, where it functions as a controllable regulator of current and voltage. For example, the BC857C,235 can be used as a switch in a cell phone circuit to switch the current on and off. It can also be used as an amplifier to amplify the signals from the microphone or speaker in a cell phone. Finally, it can be used as a voltage or current controller in a circuit for a cell phone to keep the output voltage or current within certain predetermined limits.

Conclusion

In conclusion, the BC857C,235 is a single-transistor made of bipolar junction transistor which is mainly used in microelectronic circuits. Its main function is to switch, amplify, and control the current or voltage signals in these circuits. Its current-carrying capacity, low power consumption and excellent performance in amplification makes it an ideal choice for use in a variety of microelectronics applications.

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