{"id":2296,"date":"2024-01-01T10:12:09","date_gmt":"2024-01-01T02:12:09","guid":{"rendered":"https:\/\/www.jingpengpcb.com\/?p=2296"},"modified":"2026-10-02T17:33:20","modified_gmt":"2026-10-02T09:33:20","slug":"10-pcb-panel-assembly-details-and-techniques","status":"publish","type":"post","link":"https:\/\/www.jingpengpcb.com\/en\/blog\/10-pcb-panel-assembly-details-and-techniques\/","title":{"rendered":"10 Details and Tips for PCB Panelization"},"content":{"rendered":"

Today, we\u2019ll reveal some little-known secrets about PCB panelization at PCB factories\u2014secrets that can help you better understand some key details of the PCB manufacturing process.<\/p>\n

\"10<\/p>\n

1. Border Design for PCB Panelization<\/h2>\n

The outer frame of the PCB panel, also known as the clamping edge, features a closed-loop design. The purpose of this design is to ensure that the PCB panel does not deform once it is secured in the fixture. This is critical because any changes in the shape or dimensions of the PCB could lead to manufacturing issues.<\/p>\n

2. Dimensions of PCB Panelization<\/h2>\n

The width of a PCB panel should generally be kept below 260 mm (for SIEMENS lines) or below 300 mm (for FUJI lines).<\/p>\n

If you plan to use automated dispensing, the width multiplied by the length of the PCB panel should not exceed 125 mm \u00d7 180 mm to meet the requirements of the automated equipment.<\/p>\n

3. The shape should be as close to a square as possible<\/h2>\n

When designing PCB panel layouts, try to make the overall shape as close to a square as possible. We recommend using square panel layouts such as 2\u00d72 or 3\u00d73, but avoid creating \"yin-yang\" PCBs to ensure stability during the manufacturing process.<\/p>\n

4. Control of Center Distance<\/h2>\n

The center-to-center distance between small panels should be between 75 mm and 145 mm. Maintaining this range helps ensure the stability of the panel assembly and manufacturing efficiency.<\/p>\n

5. Benchmark Points<\/h2>\n

When setting reference positioning marks, a solder mask-free area 1.5 mm larger than the positioning mark is typically left around it. This design takes into account the process requirements surrounding the positioning mark to ensure manufacturing precision and quality.<\/p>\n

6. Design of Connection Points<\/h2>\n

There should be no large components or protruding components near the connection points between the outer frame of the panel and the inner sub-panels, or between the sub-panels themselves. In addition, a clearance of more than 0.5 mm should be maintained between components and the edges of the PCB to ensure proper operation of the cutting tool.<\/p>\n

7. Four corner mounting holes<\/h2>\n

Four registration holes, typically with a diameter of 4 mm \u00b1 0.01 mm, are usually drilled at the four corners of the PCB panel\u2019s outer frame. These holes must be of moderate strength to ensure they do not break during the stacking process. High precision is required for both the hole diameter and position, and the hole walls should be smooth and free of burrs.<\/p>\n

8. Placement of Alignment Holes<\/h2>\n

Each sub-board within a PCB panel should have at least three positioning holes, typically ranging in diameter from 3 mm to 6 mm. Additionally, no traces or surface-mount components are allowed within the edge positioning holes. These positioning holes ensure accurate PCB alignment while also helping to improve manufacturing efficiency.<\/p>\n

9. The Use of Reference Symbols<\/h2>\n

In PCB manufacturing, reference marks used for positioning the entire PCB and for positioning fine-pitch components should be placed in accordance with specifications. As a general rule, diagonal reference marks should be placed when the pitch between diagonally positioned QFP (Quad Flat Package) components is less than 0.65 mm.<\/p>\n

The positioning reference symbols on PCB subassemblies used for panelization should be used in pairs and placed diagonally across from each other.<\/p>\n

10. Handling Large Components<\/h2>\n

For large components, such as I\/O ports, microphones, battery connectors, microswitches, headphone jacks, and motors, positioning pins or holes should be provided. This helps ensure the correct positioning and stability of these components.<\/p>\n

By learning these secrets of PCB panelization, you can gain a better understanding of the complexities of PCB manufacturing. These details and techniques play a crucial role in ensuring PCB quality and manufacturing efficiency.<\/p>\n

\n

Frequently Asked Questions (FAQs)<\/h3>\n

1. Why should the outer frame of a PCB panel be designed as a closed loop?<\/h4>\n

The outer frame of the PCB panel is designed as a closed loop to ensure that the panel does not deform after being secured in the fixture, thereby guaranteeing manufacturing precision and quality.<\/p>\n

2. Why should the outline of a PCB panel be close to a square?<\/h4>\n

A PCB panel layout that is nearly square helps maintain stability during the manufacturing process, but care should also be taken to avoid creating \"yin-yang\" panels to ensure manufacturing consistency.<\/p>\n

3. Why do PCB panelizations require multiple registration holes?<\/h4>\n

Multiple alignment holes ensure that the PCB is accurately aligned during the manufacturing process, thereby improving manufacturing efficiency.<\/p>\n

4. What is a QFP component?<\/h4>\n

QFP stands for Quad Flat Package. It is a surface-mount package commonly used for integrated circuits and is characterized by its fine pitch.<\/p>\n

5. Why do large components require locating pins or locating holes?<\/h4>\n

Large components require locating pins or holes to ensure their proper alignment and stability, thereby improving manufacturing reliability.<\/p>","protected":false},"excerpt":{"rendered":"

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