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”. So if you are looking for a medium power NPN transistor in Plastic package then this Transistor might be the right choice for you.When looking at the pin comparison chart of these transistors we can see that both have different pinouts. Due to this feature this transistor is widely used in amplifier applications. This reduces the cost of the Transistor and also since the package is not conductive it will not be affected by other noise in the circuit. It also has a very less saturation voltage (Base Emitter Voltage VBE) of only 5V, this makes it easy to use this IC in digital electronics which has an operating voltage of 5V.Īnother peculiar fact about this transistor is that it comes in plastic package, while most medium power transistor are available only in metal can package. The BD139 was originally manufactured by Phillips rated at 160MHz for specific audio applications, later they were cloned by other manufacturers like Samsung, ST etc.īeing a Medium Power NPN Transistor with a collector current of 1.5A this transistor can be used to control (On/Off) bigger loads that consume less than 1.5A. When base current is removed the transistor becomes fully off, this stage is called as the Cut-off Region. This stage is called Saturation Region and the typical voltage allowed across the Collector-Emitter (VCE) or Base-Emitter (VBE) could be 80V. When this transistor is fully biased then it can allow a maximum of 1.5A to flow across the collector and emitter. To bias a transistor we have to supply current to base pin, this current (IB) should be limited to 1/10th of the collector current and voltage across the base emitter pin should be 5V maximum. The maximum amount of current that could flow through the Collector pin is 1.5A, hence we cannot connect loads that consume more than 1.5A using this transistor. TIP31C, SL100, S8050, BC547, 2N2222, 2N4401īD139 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 pinīD139 has a gain value of 40 to 160, this value determines the amplification capacity of the transistor. Note: Complete Technical Details can be found at the BD139 transistor datasheet provided at the bottom of this page.
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