PCB Circuit Board Design, These Points Should Be Checked Later

May. 28, 2020

When a PCB board has completed the layout and wiring, and the connectivity and spacing are checked, and no problems are found, is a PCB completed? The answer is of course no. Many beginners, even some experienced engineers, are often in a hurry due to tight time, impatient or too confident, and ignore the post-checks. As a result, some low-level bugs have appeared, such as insufficient line width and component labels. The silkscreen is pressed on the via hole, the socket is too close, the signal is looped, etc, which causes electrical problems or process problems. Seriously, it is necessary to re-board, resulting in waste. Therefore, after a PCB has been placed and routed, post-inspection is a very important step.

PCB inspection contains many detailed elements. This article lists some of the most basic and error-prone elements that Rigid PCB Manufacturer believes to focus on during later inspections.

1. Component packaging

Pad pitch. If it is a new device, you must draw the component package yourself to ensure that the spacing is appropriate. The pad pitch directly affects the soldering of components. Via size (if any). For plug-in devices, the size of the via hole should be kept to a sufficient margin, and it is generally appropriate to keep it at least 0.2mm. Contour silk screen. The outline silk screen of the device is preferably larger than the actual size to ensure that the device can be installed smoothly.

2. Layout

The IC should not be near the board edge. Devices of the same module circuit should be placed close to each other. For example, the decoupling capacitor should be close to the power supply pin of the IC, and the devices that constitute the same functional circuit should be placed in the same area first, with clear layers to ensure the realization of the function.

Arrange the socket location according to the actual installation. The sockets are connected to other modules through leads. According to the actual structure, in order to facilitate the installation, the location of the socket is generally arranged according to the principle of proximity, and is generally close to the edge of the board.

Pay attention to the direction of the socket. The sockets are all oriented. If the direction is reversed, the wires will be re-made. For flat-plug sockets, the direction of the socket should be outside the board.

Keep the interference source away from sensitive circuits. High-speed signals, high-speed clocks, or high-current switching signals are all sources of interference and should be kept away from sensitive circuits (such as reset circuits and analog circuits). You can separate them with floor coverings.

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