The LED can be connected without limiting resistors since the IC includes internal programmable current regulation for the 10 outputs. It also has very good gain (up to 800 hFE) and low noise (up to. The maximum output current this semiconductor device can handle is 100mA. These pins are used in the circuit for turning on or off the transistor. It comes primarily in a TO-92 or advanced TO-226 package. Pin Configuration of 2N2222 NPN Transistor: This 2N2222 NPN transistor has three pins emitter, base, and collector. Due to this biasing current, 2N3904 goes to the saturation state and the LED turns ON. The IC has one pinout for designating whether the output LEDs will sequence individually (dot mode) or in form of a bar graph. This article describes the BC547 NPN transistor, its pinout, equivalents and operating principles, and its application in various electronic devices. P2N2222A Amplifier Transistors P2N2222A Amplifier Transistors NPN Silicon Features These are PbFree Devices MAXIMUM RATINGS (TA 25C unless otherwise noted) THERMAL CHARACTERISTICS Stresses exceeding Maximum Ratings may damage the device. When the switch is closed, the base of the transistor is biased, and current flows to the base of the transistor. Due to this, 2N3904 remains in the cut-off state and the LED does not glow. And no current flows to the base of the transistor. When the switch is open, the base of the transistor is not biased. The required resistor value can be easily calculated using Ohm’s law. Proper biasing of the base ensures adequate base current to turn ON the transistor.Ī resistor of 220 Ohm is connected between the load(LED) and the collector terminal to protect the LED from overcurrent. The base of the transistor is biased using a 10 K Ohm resistor(R3) in parallel to the 1 K Ohm resistor(R2) plus base-emitter junction resistance(in series). Transistors PNP Silicon Features PbFree Packages are Available MAXIMUM RATINGS Rating Symbol Value Unit Collector Emitter Voltage VCEO 40 Vdc Collector Base Voltage VCBO 40 Vdc Emitter Base Voltage VEBO 5. The complete circuit is powered via a 5 V supply. In the circuit diagram given above, 2N3904 is used as a switch to turn ON/OFF an LED connected at the collector terminal.
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