IPC-6012DS Class 3A includes space and military avionics. They are used to achieve high performances in the military or in medical, for instance. These circuit boards are highly reliable. “Class 3 includes products where continued high performance or performance-on-demand is critical, product downtime cannot be tolerated, end-use environment may be uncommonly harsh, and the product must function when required.” John Perry, Director of Printed Board Standards and Technology at IPC, explained: Class 3 PCBs are tighter in tolerances as opposed to Class 1 and Class 2 boards. This means that you expect the board to have an extended life so you can place it in a television, a computer, or an air conditioner. Class 2 is for dedicated service electronic products. Class 1 is assigned to general electric boards with a limited life and a “simple” function, such as the ones you can find in remote controls. This article will help you understand the different design rules for IPC Class 2 and Class 3 circuit boards. Most of the times, even if the end-use of the product only requires Class 1, we will make it Class 2 just to ensure a better performance. Class 1 does exist although we rarely produce boards that fall into this classification. RLC Resonant Frequency and Impedance CalculatorĪs a circuit board manufacturer, designers often ask us about the difference between IPC Class 2 and Class 3.
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