But if BC547 is driving a load higher then 25V then you cannot replace it with S8050. If that voltage is under 20V (S8050 collector to emitter voltage is 25V but we cannot use a transistor to its absolute maximum ratings because this makes stress on the transistor) then you can easily replace it and more of the circuit in which these transistor are used are usually 12V or under 12V. So if you are using it in an amplifier circuit then there will be not much difference and you can use them interchangeably but if you want to use it as a switch then first you have to check the load voltage or how much voltage the load requires. Ratings & Characteristics Comparison : Ratings & CharacteristicsĪs we can see in the ratings and characteristics chart above the collector to emitter voltage of S8050 is 25V, collector current is 1500mA, Total device dissipation is 1000mW, max DC current gain is 300 and transition frequency (fT) is 100MHz while the BC547’s collector to emitter voltage is 45V, collector current is 100mA, total device dissipation is 625mW, max DC current gain is 800 and transition frequency is 300MHz. Therefore when a replacement condition is match then you have to change the face of the transistor to opposite side. The S8050 transistor’s first pin is “Emitter” second is “Base” and third is “Collector” and the BC547 transistor’s first pin is “Collector”, second is “Base” and third is “Emitter”. If you are designing a PCD or Perf board with this component then the following picture from the Datasheet will be useful to know its package type and dimensions.When looking at the pin comparison chart of these transistors we can see that both have different pinouts. Amplifier modules like Audio amplifiers, signal Amplifier etc.Driver Modules like Relay Driver, LED driver etc.When uses as an Amplifier the DC current gain of the Transistor can be calculated by using the below formulaeĭC Current Gain = Collector Current (I C) / Base Current (I B) ![]() Of the above types common emitter type is the popular and mostly used configuration. Some of the configurations used in amplifier circuits are It can amplify power, voltage and current at different configurations. The value of I B should not exceed mA.Ī Transistors acts as an Amplifier when operating in Active Region. Where, the value of V BE should be 5V for BC547 and the Base current (I B depends on the Collector current (I C). ![]() The value of this resistor (R B) can be calculated using below formulae. Anything more than 5mA will kill the Transistor hence a resistor is always added in series with base pin. As mentioned the biasing current should maximum of 5mA. 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. When a transistor is used as a switch it is operated in the Saturation and Cut-Off Region as explained above. 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. 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 this transistor is fully biased then it can allow a maximum of 100mA to flow across the collector and emitter. To bias a transistor we have to supply current to base pin, this current (I B) should be limited to 5mA. ![]() ![]() 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. Note: Complete Technical Details can be found at the BC547 datasheet given at the end of this page.īC549, BC636, BC639, 2N2222 TO-92, 2N2222 TO-18, 2N2369, 2N3055, 2N3904, 2N3906, 2SC5200īC547 transistor has a gain value of 110 to 800, this value determines the amplification capacity of the transistor. Continuous Collector current (I C) is 100mA.BC547 is a NPN transistor hence the collector and emitter will be left open (Reverse biased) when the base pin is held at ground and will be closed (Forward biased) when a signal is provided to base pin.
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