1, IC notch mark: arc notch is located at an end of the integrated circuit, circuit board manufacturers identify pin arrangement sequence identification method is to face the model on the integrated block shell, arc notch under the first left for the first pin of the integrated circuit, with this pin beginning in the counterclockwise direction of the second, third, fourth and so on.
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2, with dots for identification: that is, circular pits, small circles, color bar markers, dual in-line type and single in-line type integrated circuits, circuit board manufacturers identify more using this identification mark, this integrated circuit pin identification mark and model are marked on the same plane of the shell. Its pin arrangement order is to face the model of the integrated block, and the first pin from the left of the bottom of the circular pit (or small circle, color bar) is the first pin of the integrated circuit. For the chip type integrated block, starting from the first foot in a counterclockwise direction, the second foot, the third foot, the fourth foot, and so on.
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3, with the text as the logo (looking at the IC bottom pin on the left of the first foot \"1\") : There are also a small number of integrated circuits, the shell does not have the above various marks, and only the circuit board manufacturer to identify the model of the integrated circuit, for the identification of the pin number of this integrated circuit, the integrated block printed on the model side up, facing the model, the bottom left of the first pin for the first pin of the integrated circuit, and then count along the counterclockwise direction, The second foot, the third foot, and so on.