![]() The base of the transistor cannot be left floating otherwise there could be false triggering to the transistor which may lead to issues in the circuit. ![]() When we turn on the transistor by supplying a required current to the base of the transistor it will remain on unless the voltage at the base of the transistor reaches zero. The simulated circuit below shows how this transistor behaves when a base current is applied to the and when no current is provided to the base. BC550 is a NPN transistor that means it will be left open when no current is applied to its base, but when we apply a base voltage the Unlike MOSFET’s transistors are current controlled devices, meaning they can be turned on or off by supplying required base current, for the BC550 transistor it is 2mA. As you already may know a transistor is a current controlled device so when base current is removed the transistor becomes fully off, in this stage the transistor is working in its Cut-off Region and the Base Emitter voltage could be around 660 mV. ![]() When this transistor is in biased condition, then it can allow a maximum current of 100mA across CE(Collector Emitter) Junction, this state of the transistor is called the saturation state and driving a load that consumes more current than 100mA may damage the device in this condition. This transistor has a collector emitter voltage of 45V and a collector base voltage of 50V. The maximum collector current of this transistor is rated at 100mA with an maximum emitter base voltage of 5V. This transistor comes with three different versions BC550A,BC550B, and BC550C, if you are using this transistor as an amplifier make sure you check the gain of the transistor from the datasheet that can be found down below, because of different versions, the gain value differs which can completely ruin your calculations. The BC550 is a NPN Transistor, hence we need to provide a small amount of positive voltage to the base of the transistor to turn it on. When a positive voltage is applied to the base holes are created to the base so they start migrating to the emitter junction,this process thins out the depletion region from PN junction and more and more electrons start flowing to the and all of those electrons are collected by the collector. The BC550 Transistor is a general purpose N-P-N transistor, in which N-P-N transistor electrons work as the primary charge carriers that are emitted from the emitter of the transistor to the PN junction. Note: More technical information can be found in the BC550 datasheet, linked at the bottom of this page.īC547, BC548, BC549, 2n3904, 2SC5200,BC639, BC636, 2N222 TO-92, The features and specifications of the BC557 transistor include the following.Electrons Emitted from Emitter Collected by the CollectorĮlectrons emitted from the emitter into the first PN junction Pin3 (Emitter): Flow of current drains out through this terminal.Pin2 (Base): The base terminal of this transistor controls the biasing.Pin1 (Collector): The current supplies throughout the collector terminal.The BC557 transistor symbol is shown below. This transistor includes three terminals like a normal transistor namely base, emitter & collector. The pin configuration of the BC557 transistor is shown below and each pin and its functionality is discussed below. This collector to emitter terminal voltage is used within circuits which require 40V to 45V DC. The value of VCE for this transistor is good like -45V. When this transistor is used as a switch for below 100mA loads then it works well. The highest collector dissipation is 500 milliwatt. These ratings can be determined through the final letter after its digit. Its hFE ratings of this transistor range from 125 to 800 to make the transistor ideal by using like an amplifier within electronic circuits like audio signal amplification. BC557 is a general-purpose transistor, used like an amplifier or a switch in electronic circuits.
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