PCB Technical - The method for the circuit board manufacturer to identify the IC mark and pin sequence

The method for the circuit board manufacturer to identify the IC mark and pin sequence

There are many ways for circuit board manufacturers to identify the IC mark and pin sequence. Below, the editor of the Shenzhen circuit board manufacturer and everyone will learn about the identification methods of several marks and pin sequences as follows:

1. IC has a notch mark: the arc-shaped notch is located at one end of the integrated circuit. The identification method of the circuit board manufacturer to identify the pin arrangement sequence is to look at the model number marked on the integrated block housing, starting from the left below the arc-shaped notch The first pin is the first pin of the integrated circuit. Starting from this pin, it is the second pin, the third pin, and the fourth pin in the counterclockwise direction.

2. Mark with dots: that is, circular pits, small circles, color bar marks, dual-in-line and single-in-line integrated circuits. Circuit board manufacturers often use this identification mark for identification. This integration The pin identification mark and model number of the circuit are marked on the same plane of the housing. The order of its pins is to look at the model of the integrated block. The first pin from the left below the circular pit (or small circle, color bar) is the first pin of the integrated circuit. For patch-type integrated blocks, start from the first pin and go counterclockwise, followed by the second pin, the third pin, the fourth pin, and so on.

3. Mark with text (the first pin on the left side of the IC bottom row is "1"): There are also a few integrated circuits that do not have the above-mentioned marks on the shell, but only the manufacturer of the circuit board Identify the model of the integrated circuit. For the identification of the pin number of this kind of integrated circuit, the side with the model number printed on the integrated block should be facing up, and the model should be looked at. The first pin at the bottom left is the position of the first pin of the integrated circuit. Then count in the counterclockwise direction, followed by the second pin, the third pin, and so on.

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