source:Industry News release time:2022-08-01 Article author:yu Popular:pcb
1.TOP LAYER (top wiring layer): designed as the top copper foil trace. If it is a pcb single-sided circuit board, there is no such layer.
2. BOMTTOM LAYER (bottom wiring layer): designed as the bottom copper foil trace.
3. TOP/BOTTOM SOLDER (top/bottom solder mask green oil layer): The top layer/bottom layer is laid with solder mask green oil to prevent tin on the copper foil and maintain insulation. Open windows with solder mask green oil at pads, vias and non-electrical traces on this layer.
The pad will open the window by default in the design (OVERRIDE: 0.1016mm), that is, the pad exposes the copper foil, expands 0.1016mm, and tin is applied during wave soldering. It is recommended that no design changes be made to ensure solderability;
In the design, the via hole will be opened by default (OVERRIDE: 0.1016mm), that is, the via hole exposes the copper foil, and the external expansion is 0.1016mm, and tin is applied during wave soldering. If the design is to prevent tin on the via hole and not expose copper, the PENTING option in the additional property SOLDER MASK (solder mask opening) of the via hole must be checked, and the via hole opening is turned off.
In addition, this layer can also be used for non-electrical wiring alone, and the solder mask green oil will open the window accordingly. If it is on the copper foil trace, it is used to enhance the overcurrent capability of the trace, and tin is added during welding; if it is on the non-copper foil trace, it is generally designed to be used for logo and special character silk screen printing, which can save the production Character silkscreen layer.
4. TOP/BOTTOM PASTE (top/bottom solder paste layer): This layer is generally used to apply solder paste during the SMT reflow soldering process of SMD components. It has nothing to do with the PCB board manufacturer's board. It can be deleted when exporting GERBER. PCB You can keep the default when designing a multi-layer circuit board.
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