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2025/07/18

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Have you heard of "acid horn" in PCB design

To know what tamarind is, it is important to understand the PCB production process! Engineers who know something about the PCB production process know that before PCB production, the PCB diagram is drawn through circuit board design software, and then goes through the etching process of the PCB processing factory, and finally the designed PCB circuit is etched on the copper-clad board.
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Signal interface conversion By the way, a basic flow chart of PCB production process is attached Among the basic processes of PCB production process, the most important is the etching process. It uses chemical treatment to remove unnecessary copper from the copper-clad board through etching, and then leaves the required circuit diagram. To a certain extent, Acid Traps can be said to be left by etching. "side effects".

The chemicals used to etch circuits should be removed during the neutralization and water washing process, but in the acute angle area formed by the PCB connection, that is, the narrowest acute angle, it is easy to cause corrosive chemicals to remain, which is like a trap to surround and suppress the residual corrosive chemicals. substance.

By slowly and continuously corroding the copper in the acute-angle area, over time, the line resistance of the wiring will increase or a virtual connection state will occur, and short circuit faults will easily occur, making troubleshooting difficult. This is the headache of Acid Traps. "corner" phenomenon. PCB trace angle problem This involves a PCB trace angle issue.

Everyone has always emphasized: Don’t trace traces at right angles! So, here comes the question. If you are not allowed to go at a right angle, is it better to go at a 45° angle or an arc? Is 90° right-angle routing really okay? At first, I was obsessed with the corner angle of the wiring. I looked up the history of our predecessors. In the 1990s, Intel launched PCI bus technology. Since then, it has accelerated the development of "high-speed" systems. As for whether PCB traces can go at sharp angles, the conclusion is definitely not possible. From the perspective of PCB DFM, sharp angles in PCB traces should be avoided, and acid traps should be avoided as much as possible.

2023/09/01 LoRa wirelss modem Comment(0)

• Newer : How is the crystal oscillator laid out on the PCB?
• Older : HTTP is essentially a TCP connection