There are many kinds of integrated circuits, different shapes and sizes, and their pins are as few as 3 and as many as hundreds. Regarding the arrangement of pins of integrated circuits, the following arrangement rules can be followed for identification.
1. Pin arrangement of dual in-line package integrated circuit
No matter what type of integrated circuit, there is a sign (mark) as the first pin, the mark has a circle, a notch, a concave semi-circular pit, etc. Put the pin of the integrated circuit down, face the type (sequence) mark, so that the mark (mark) faces left, and the lower left is the first pin. Start with the ① foot, turn counterclockwise to the top left, and sort each pin in turn. For example, for a small-scale digital integrated circuit with 14 pins, the pins face down, the marker faces left, the bottom left is the first foot, the bottom right is the seventh foot, the top right is the eighth emotion, and the top left is the 14th foot. Similarly, for an IC with 40 feet, the lower left is pin 1, the lower right is pin 20, the upper right is pin 21, and the upper left is pin 40.
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2. Pin distribution of a single in-line integrated circuit
Single-row in-line integrated circuits are packaged in many forms, but, as the name suggests, their pins are in one row. The IC in this package form has a clear mark (mark) on the front (model face) to indicate the position of the first pin. This mark (mark) can be a missing corner, a pit, a semicircular notch, etc. The pins are distributed and sequenced from left to right starting from this pin.
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3. Pin distribution of four-column integrated circuits
Four columns of IC pins are distributed around the IC. The first foot is clearly marked. From there, the pins are followed counterclockwise.
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4. Pin arrangement of metal encapsulated round cap integrated circuit