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Stamp Holes in PCB Fabrication: Design Standards, Applications, and Panelization Techniques

Release time:

2025-07-17

Stamp Holes

PCB stamp holes are a method used on board edges or during panelization to facilitate board separation. In a main panel layout, small boards need to be connected by connecting strips. To make cutting easier, small holes are drilled into these strips—similar to the perforations on the edges of stamps—and these holes are called stamp holes.

Continued:

1.Suitable for boards with high 外形要求 (milling for board separation).

2.Stamp holes can avoid positions where components are placed on the board edge; there should be no pads or through-holes within a 1mm range of stamp holes.

3.Applicable to scenarios where Layout is restricted and components on the board edge need to be avoided.

Types of Stamp Holes

1.Half-holes

2.Half-holes with smaller diameters

3.Holes tangent to the board edge

Standard Spacing for Stamp Holes

Stamp holes are typically non-metallized holes (NPTH) with a diameter of 1.0mm (40mil), spaced at 1.27mm (50mil) center-to-center, and recessed 0.4mm (16mil) from the main PCB edge.

Functions of Stamp Holes

While most PCBs use V-CUT for panelization, stamp holes are employed for:

1.Irregular or circular PCB shapes where V-CUT is impractical.

2.Supporting panelized boards during manufacturing to prevent separation before depanelization.

3.Maintaining mold integrity during PCB fabrication (prevents mold collapse).

Common applications include creating modular PCBs (e.g., Wi-Fi modules, Bluetooth boards, or core processor modules) that are later assembled onto a larger PCB as discrete components.