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Design for Assembly: Components
December 18, 2013 |Estimated reading time: Less than a minute
IPC Classes 1, 2 & 3 for defect reject/accept criteria
A PCB designer needs to design every layout to meet one of the IPC product classes so that the manufacturer knows the category classification of the end electronic product being designed. A PCB designer can find these three product classes in most IPC standard publications:
- Class 1: General Electronic Products
Includes products suitable for applications where the major requirement is function of the completed assembly.
- CLASS 2: Dedicated Service Electronic Products
Includes products where continued performance and extended life are required, and for which uninterrupted service is desired but not critical. Typically the end-use environment would not cause failures.
- CLASS 3: High Performance/Harsh Environment Electronic Products
Includes products where continued high performance or performance-on-demand is critical, equipment downtime cannot be tolerated, end-use environment may be uncommonly harsh, and the equipment must function when required, such as medical life support, military battlefield or other critical systems.
The IPC-7351B land pattern standard uses a three-tier PCB library system for various electronic device applications. These include most, nominal and least dimensional criteria. Read the full article here.Editor's Note: This article originally appeared in the October 2013 issue of The PCB Design Magazine.