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bc557 transistor as a switch

Next, connect an LED and a resistor to the collector of the transistor, with the help of the diagram. BC157, BC558, 2N3906, 2SA1943, BD140, S8550, TIP127, TIP42, BC557 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. For the transistor in the cutoff region, the voltage across base-emitter(VBE) is around 660mV. Components101 is a resource dedicated for electronics design engineers, covering product news, analysis and articles on latest electronics components. P(max) here is 500 mW or half watt for the entire group. The alternative of this transistor is 2N3906, 2N4403, BC556, BC327. This  model is B10K within the datasheet. As shown in the figure below, consider you have a single BC547 transistor. Some are very large, some so small they require a screwdriver. Compnents, Transistors You will need to make an initial platform or a basic set-up and then make it work as desired. It has 125 to 800 HFE ratings which make it an ideal transistor to use as a small signal amplifier in electronic circuits. Landscape Design CAD Programs for Architects. Anything more than 5mA will kill the Transistor; hence a resistor is always added in series with base pin. When uses as an Amplifier the DC current gain of the Transistor can be calculated by using the below formulae, DC Current Gain = Collector Current (IC) / Base Current (IB), Your Rating 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. Here are some other example circuits found here at Bright Hub. That’s why a BC547 and BC557 are taken as complementary pairs having complementing reverse order performance. Note: Complete Technical Details can be found at the BC557 datasheet given at the end of this page. Now adjusting the pot’s slider arm more towards the ground, you’ll find, makes the LED gradually dim, and ultimately switch OFF, at some particular point of the pot setting. BC557 is a widely used PNP bipolar junction transistor manufactured in small TO-92 package. Current Limiter: Two BC547 transistors when connected as shown in the article, provides a useful feature of controlling the amount of current drawn by the load. 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 maximum base current should be 5mA for BC557 Transistor as mention above in the features. For testing the basic working pattern of the transistor, you would further need to fix a pot along the “base”, positive and the negative terminal. Not that bad 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. I have already discussed a huge number of BC547 simple circuit configurations. A BC547 transistor is a tiny three terminal device capable of converting small signal inputs into large amplified outputs, probably one of the greatest inventions of mankind so far. So a resistor is always added in series with the base pin. We are glad that you preferred to contact us. The value of the resistor can be calculated by using this formula. Some of the configurations used in amplifier circuits are, Of the above types common emitter type is the popular and mostly used configuration. BC557 PNP transistor 3. The table also shows the respective hFE estimations, our BC547, in general may have hFE rated over 100, however the sub-categories with an extra suffix “B” or “C” indicate the device’s enhanced hFE ratings, so a BC547B may have hFE levels well above 200 and maximum up to 500, similarly a BC547C may begin with a level of 400 and cross well over 600. For the long life of this transistor it is essential to not operate it under -45V DC in your electronic circuits, always use a suitable resistor on-base point, do use this transistor more than -100mA load, the operating and storage temperature. Companies like NXP, PHILIPS, Micro Electronics, and FAIRCHILD, to name a few, are the leaders in manufacturing this device. BC557 Transistor as switch When a transistor is used as a switch it is operated in the Saturation and Cut-Off Region as explained above. the transistor’s emitter connects to the positive, LED/resistor assembly connects across the collector and the ground, and, initially the LED remains switched OFF and gradually comes ON as the pot’s slider arm is gently moved more toward the ground and vice versa. Save my name, email, and website in this browser for the next time I comment. This is where a PNP transistor differs from a NPN transistor, a Logic state (blue colour) is used to toggle between Ground and Signal Voltage (Emitter-Base Voltage VBE) as shown below. Here it’s 100 mA for all. Besides these uses, BC557 is also a good general-purpose PNP transistor to use in your simple electronics projects so this transistor has to have in your electronics lab. These transistors are mostly used in driver stages of audio amplifiers, low noise input stages of tape recorders, HI-FI amplifiers, and signal processing circuits of television receivers. HVAC: Heating, Ventilation & Air-Conditioning, Hobbyist & DIY Electronic Devices & Circuits, BC546, BC547, BC548, BC549, BC550, BC556, BC557, BC558, BC559, BC560 Transistors, Single BC547 Application Example Circuits, Complementary BC547/BC557 Application Circuits, http://www.fairchildsemi.com/ds/BC/BC547.pdf, Commercial Energy Usage: Learn about Emission Levels of Commercial Buildings, Time to Upgrade Your HVAC? Where, the value of VBE should be 5V for BC557 and the Base current (IB depends on the Collector current (IC). 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. Average The above criteria concerning a BC547 are the important ones and probably sufficient for helping new users during their construction projects, The following section shows some fundamental rules and hints apply these devices into simple electronic circuits. As mentioned the biasing current should maximum of 5mA. As shown in the figure, connect a resistor of some minimum safe value to the base of the transistor, say a 1 K resistor, this will ensure that at least the device cannot get damaged through its “base” pin-out, because the resistor will never allow the relevant currents to develop to dangerous levels across the vulnerable base/emitter junction of the transistor. As we use a transistor as a switch it is operated in Saturation and cut Off region. Save my name, email, and website in this browser for the next time I comment. BC557 is a PNP Silicon Planar Epitaxial transistor. To bias a transistor we have to supply current to base pin, this current (IB) should be limited to 5mA. Good Components Info © 2020. BC557 transistor is a PNP bipolar junction general-purpose transistor that is used as a switch or amplifier in electronic circuits.

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