Design Guidelines for Error Free IPC Class 3 PCBs | Sierra Circuits
Channel: Sierra Circuits
Date: 2023-06-13

IPC class 3 PCBs are generally implemented in high-performance products with little or no downtime. These boards must be fabricated without any defects, such as voids, solder deformation, or via barrel cracks to achieve high reliability. Class 3 circuit boards adhere to tight manufacturing tolerances that are defined by IPC-6012E standards.

The IPC-6012E document defines the specifications and performance requirements expected of a class 3 board. IPC-6012E has separate addenda for space, military, automotive, and healthcare industries. They set benchmarks for annular ring breakouts, drill size, pad diameter, plating thickness, voids, dielectric spacing, and solder joint acceptance.

Understanding these specs during the initial stage will reduce respins and turnaround time. You also need to understand if your manufacturer is capable of building a class 3 board. If the requirements are beyond the IPC specifications, then you can build it as agreed between you and the fab house (AABUS).

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