TRANSISTOR BC558 PDF

This article explains BC transistor pinout, equivalent, features, applications and other details about how and where to use this device. It can be used as for any type of general amplification or switching. For using it as a switch to drive load it can handle mA of load with 30V. The collector dissipation is mW and maximum DC current gain is therefore it can also be used as audio preamplifier purposes and audio amplification purposes. The emitter-base voltage is -5V due to which it can also be used at the output of microcontrollers.

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BC is a PNP transistor hence the collector and emitter will be closed Forward biased when the base pin is held at ground and will be opened Reverse biased when a signal is provided to base pin. BC has a gain value of to ; this value determines the amplification capacity of the transistor. When this transistor is fully biased then it can allow continues current of mA to flow across the collector and emitter.

When base current is removed the transistor becomes fully off, this stage is called as the Cut-off Region and the Base Emitter voltage could be around mV. When a transistor is used as a switch it is operated in the Saturation and Cut-Off Region as explained above. As discussed a transistor will act as an Open switch during Forward Bias and as a closed switch during Reverse Bias, this biasing can be achieved by supplying the required amount of current to the base pin.

A resistor is always added in series with base pin to limit the base current. The value of this resistor RB can be calculated using below formulae. Also note that a PNP transistor is always used for high side switching, meaning the collector is connected to power and emitter to load that is to be switched. A Transistors acts as an Amplifier when operating in Active Region. It can amplify power, voltage and current at different configurations.

Of the above types common emitter type which amplifies voltage is the popular and mostly used configuration. The BC because of this large gain value is normally used to as a audio amplifier. Where an input signal of low voltage is amplified switched to high voltages t0 drive loads like speakers. In the below GIF you can notice the transistor being switched for a low voltage 1v audio signal. When uses as an Amplifier the DC current gain of the Transistor can be calculated by using the below formulae.

Subscribe to stay updated with industry's latest Electronics components and news. BC as switch When a transistor is used as a switch it is operated in the Saturation and Cut-Off Region as explained above. Amplifier modules like Audio amplifiers, signal Amplifier etc.. Component Datasheet. BC Datasheet. Tags PNP Transistor. Get Our Weekly Newsletter!

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