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Transistor base emitter collector3/13/2023 ![]() The gain of this amplifier is directly proportional to the resistor RC value. When a common-emitter transistor amplifier without emitter degeneration is designed, the value of resistor RC is chosen to match the amplifier gain requirements. ![]() Pin Identification is same as that of Motor driver IC except that instead of just a curved spot, one end of it is completely cutoff in the middle to form a curved surface.Due to its high efficiency and positive gain greater than unity, the most commonly used transistor amplifier is the common-emitter transistor amplifier. Starting from the left-hand side of the curve, the pins are numbered from 1 to 8 and the remaining pins are on the right-hand side numbered from 9 to 16, from bottom to top. Like any other Integrated Circuits, this IC also consists of a curved spot on one of its end. Identifying pins of different Integrated Circuitsįor few photosensors like TSOP sensor, the curved surface is held such that starting from left, the first pin is the ground pin, second is Vcc and third is the output pin. The pin connection of common IR sensors is given below There is a projected part in one side which is the front side. Various types of Infrared Modules are available. For few UJTs like 2N2646, holding the device such that the pins are downwards and starting from clockwise direction, the 1 st one is the Base1 terminal, the second or the middle one is the Emitter terminal and the third one is the Base2 terminal. Pin 1 is the anode, Pin 2 is the Gate and Pin 3 is the cathode. The pins are numbered from 1 to 3 starting from left to right. Usually, the device is held such that the flat side is facing toward the person. The pin configuration is the same as that of a Bipolar Junction Transistor. The Anode terminal is the metallic contact on the screw part of the TRIAC. In some cases like TRIACs by Siemens, the two terminals which can be seen are gate and cathode, with the shorter one being the gate and the longer one is the cathode. Pin 1 is the main terminal 1, pin 2 is the main terminal 2 and pin 3 is the Gate terminal. In some TRIACs like 2N6071A/B keeping the flat surface towards your side, the pins are numbered from 1 to 3. The Code printed side is the front side.BT 136, BT 138 and ST44B are TRIACs. Like Transistors, the SCR pins can be identified by keeping the front side towards you. To switch off it, we have to break the anode current through switch off. Once triggered, the SCR will latch and continue to conduct even if the gate voltage is removed. Current flows from Anode to Cathode when the Gate gets a positive pulse. SCR is a three pin device and its pins are Anode (+) Cathode (-) and a Gate. Identifying Pins of Power Electronic Devices The cathode lead is the one near a ring around the body and the other is the anode lead.įor practical photodiodes like QSD2030F, keeping the curved surface towards the person holding the device, the shorter terminal is the cathode whereas the longer one is the anode. Usually, for new LEDs, the positive pin is the one with longer lead and the negative pin is the one with shorted lead.įor practical LASER diodes like DL-3149-057, holding the curved surface towards the person holding it, the pins are numbered from 1 to 3 with the 1 st pin being the cathode, the second one being the common pin and the third one being the anode. The one with a flattened edge is the negative pin and the straight pin is the positive pin. The LED pins can be identified by inspecting the LED from the top view. Pin Identification of few Available Diodes This table shows the pin connections of Regulator IC, MOSFETs, Temperature Sensors, Melody IC, Phototransistor etc Normally making the flat side faced towards you, the pins are labeled as S, G, D starting from left to right. In some cases, it is recommended to consult the datasheet of the MOSFET. Usually, in some cases, the pins of MOSFET are accordingly labeled as G, S, and D denoting Gate, Source, and Drain. MOSFET – Metal Oxide Semiconductor Field Effect Transistor The 1 st one is the source, then the gate and then the drain.ģ. To identify a Field Effect Transistor, one should keep the curved portion facing him/her and start counting in the anti-clockwise direction. So to get an idea, the following table will help you The pin arrangement may vary in some transistors. Pin close to the Tab is Collector.īut this is not a standard pin configuration. In NPN type, the pin close to the Tab is Emitter, the opposite one, the Collector and the middle one, base. ![]() In Metal can types, the pins are arranged circularly.
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