Standards for aspect ratios and drill tolerances.
Includes communications equipment and business machines where high performance and extended life are required, but uninterrupted service is not critical. Class 3 (High-Performance/Harsh Environment): Ipc-2221 Pcb Design Pdf
Before sending your Gerbers to a manufacturer (like JLCPCB or PCBWay), compare your layout against the IPC-2221 annular ring requirements. Many cheap fabs accept "IPC Class 2" by default. If your product needs Class 3, you must explicitly tell the fab and present your IPC-2221 compliance report. Standards for aspect ratios and drill tolerances
Standards for aspect ratios and drill tolerances.
Includes communications equipment and business machines where high performance and extended life are required, but uninterrupted service is not critical. Class 3 (High-Performance/Harsh Environment):
Before sending your Gerbers to a manufacturer (like JLCPCB or PCBWay), compare your layout against the IPC-2221 annular ring requirements. Many cheap fabs accept "IPC Class 2" by default. If your product needs Class 3, you must explicitly tell the fab and present your IPC-2221 compliance report.