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What to do with unconnected IC pins

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ElectronicsClub

Published on Oct 18, 2023

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When working with microcircuits, unused pins often remain, which can cause unexpected operation of the circuit or even damage to the microcircuit itself, this can also affect increased power consumption and, as a result, rapid discharge of the battery or galvanic cell. Therefore, it is necessary to deal with unused pins of the microcircuit correctly. In some cases, the pins can be left as is, in another case they need to be connected to the plus or minus of the power source, in the third case they cannot be connected anywhere. Unused pins of CMOS microcircuits must be connected to the plus or minus of the power source, since the main components of such integrated circuits are field-effect transistors with an insulated gate. The pin of the microcircuit can be imagined as a mini antenna that captures various electromagnetic waves, as a result of which charges accumulate on the gate of the field-effect transistor and when a certain potential is reached, a breakdown of the dielectric layer may occur. Ultimately, the transistor, and, accordingly, the microcircuit will fail. In logical digital CMOS microcircuits, only the gate inputs need to be connected to the positive or grounded. The output pin should be left as is, since it is guaranteed to have a high or low potential, which is determined by the type of logic element and the state of the inputs. If you connect the output pin, a short circuit may occur. The inputs of the unused comparator must be supplied with opposite potentials, that is, either plus-minus or minus-plus, but not the same potential. #microcircuit #CMOS #electronicsclub

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