What is Anchoring Spur
An anchoring spur, also known as a tie-down, is a feature utilized in the design of rigid flex PCBs. It ensures the integrity and stability of the PCB during the assembly process by preventing any separation or detachment between the base material and the copper layers.
The anchoring spur is strategically incorporated into the PCB design to address the potential risks associated with high-temperature excursions, such as soldering. It is particularly relevant for pads that lack attachment to the rest of the circuit through a hole, making them susceptible to lifting or delamination in demanding assembly environments.
This additional structure, often taking the form of tabs, flanges, fingers, or anchors, serves as a support mechanism for unsupported pads. By extending beneath the cover lay, the anchoring spur assists in firmly holding the pad to the base material, minimizing the risk of damage or failure during the manufacturing and assembly processes.
The term “spurs” is considered the most precise description for these supplementary structures. However, “anchoring spur” specifically refers to the implementation of such features for unsupported pads without holes. This distinction ensures a secure and reliable connection, safeguarding the overall functionality and longevity of the PCB.