![]() 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 1st 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 The one on the left is the Gate and the one on the right is the Emitter.įor practical phototransistors like L14G2, keeping the curved surface towards the person holding it and starting from the clockwise direction, the 1st one is the collector, the second one is the emitter and the third one is the base. IGBT- Insulated Gate Bipolar Transistorįor a few practical IGBTs like GN2470, the raised up surface is placed towards the person holding it such that the shorter one in the middle is the cathode. Normally making the flat side faced towards you, the pins are labeled as S, G, D starting from left to right.Ĥ. 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 1st 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. ![]() But in PNP transistors, the condition will be just reversed. In most NPN transistors it will be 1 (Collector), 2 (Base) and 3 ( Emitter ). To identify the pins, keep the front flat side facing you and count the pins as one, two etc. In plastic casing, one side of the transistor is Flat which is the front side and the pins are arranged serially. Transistors may be NPN or PNP which are available in the Plastic casing or Metal Can package.
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