BC308BU

Series:	--
Packaging:	Bulk
Part Status:	Obsolete
Transistor Type:	PNP
Current - Collector (Ic) (Max):	100mA
Voltage - Collector Emitter Breakdown (Max):	25V
Vce Saturation (Max) @ Ib, Ic:	500mV @ 5mA, 100mA
Current - Collector Cutoff (Max):	15nA
DC Current Gain (hFE) (Min) @ Ic, Vce:	120 @ 2mA, 5V
Power - Max:	500mW
Frequency - Transition:	130MHz
Operating Temperature:	150°C (TJ)
Mounting Type:	Through Hole

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Introduction

The BC308BU is a bipolar junction transistor (BJT) in the single configuration, a type of transistor that makes use of two PN junctions in its structure. It is mainly used as a common emitter amplifier or switch, ideal for applications in computing or other electronic equipment. It can also be used as a frequency changer and sometimes as an oscillator if certain conditions are met. In this article, we will explore the applications and working principle of the BC308BU transistor.

Applications

The BC308BU is ideally suited for use as an amplifier for low-level audio signals, ideal for use in devices such as computers, audio systems, and digital signal processors. It\'s also used for switched applications such as power supplies, lighting control, and some motor control applications. Due to the low power dissipation the BC308BU offers, it is also used in battery-operated gadgets and portable equipment.The properties of the BC308BU can be used for more complex applications such as amplifying microphones, providing audio link for two-way communications and for signal propagation, as well as for analog processors like amplifiers, transformers and oscillators.

Working Principle

The BC308BU is a bipolar junction transistor which is based on the principle of minority carrier injection. This means that when a voltage signal comes across the base-emitter terminals, the current flowing through the PN junction is driven by the transfer of a small number of minority carriers (electrons or holes). The collector-emitter current is thus dictated by the properties of the transistor, mainly the current gain and the breakdown voltage. The BC308BU has an emitter-collector cutoff voltage of 1.2V and a current gain of 200. The current gain is indicative of how much the current through the collector-emitter terminals will be amplified for a given base-emitter current. The BC308BU transistor is also temperature sensitive and therefore requires a temperature stable operating environment to ensure the best performance.

Conclusion

The BC308BU is a single bipolar junction transistor, mainly used for amplifying low-level audio signals, controlling power supplies and other applications that require low power dissipation. It is based on the concept of minority carrier injection and offers a current gain of 200 and an emitter-collector voltage cutoff of 1.2V. It is temperature sensitive and therefore should be operated in a stable environment to ensure optimum performance.

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