BC556A DATASHEET PDF

Jukazahn In the event of an unauthorized use of Fairchild s product, Fairchild accepts no liability in the event of product failure. All operating parameters, including Typicals must be validated for each customer application by customer s technical experts. Emitter B More information. Power down protection is provided on all More information. Datasheet contains preliminary data; supplementary data will be published at a later date.

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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.

BC as switch 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. It can amplify power, voltage and current at different configurations. Some of the configurations used in amplifier circuits are Common emitter amplifier Common base amplifier 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.

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