The maximum collector dissipation is 500 milliwatts which are also another good feature of this transistor.Moreover, its performance well when used it as a switch for load under 100mA.BC557 transistor has also good collector to emitter (VCE) value that is -45V, therefore you can easily use it in circuits using 40 to 45 volts DC.
![]() ![]() The temperature should be under -65 to 150 Centigrade, and always check the pinout of the transistor before placing it in By chance wrongly placed, then check the transistor again before placing it in the circuit because wrong input can weak its performance. A transistor acts as an open switch during forwarding bias and closed switch during reverse bias. The maximum base current should be 5mA for BC557 Transistor as mention above in the features. The value of the resistor can be calculated by using this formula. BC547 has a gain value of 110 to 800, this value determines the amplification capacity of the transistor. The maximum amount of current that could flow through the Collector pin is 100mA, hence we cannot connect loads that consume more than 100mA using this transistor. To bias a transistor we have to supply current to base pin, this current (I B ) should be limited to 5mA. This stage is called Saturation Region and the typical voltage allowed across the Collector-Emitter (V CE ) or Base-Emitter (V BE ) could be 200 and 900 mV respectively. 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 660 mV. 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. ![]() The value of this resistor (R B ) can be calculated using below formulae. It can amplify power, voltage and current at different configurations. When uses as an Amplifier the DC current gain of the Transistor can be calculated by using the below formulae.
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