Ipc 7351b Pdf Free
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The recommended circuit pad dimensions for the IPC 7351B standard for the solder reflow process are shown in the table. The pad material should not be a mixture of dissimilar materials (e.g., copper and solder). If these materials are used, the proper bonding strength will not be achieved due to the stress concentration caused by the choosing of dissimilar materials.
Appropriate pad design, solder application, and component orientation are all ingredients of a quality, defect-free soldering process. The Institute for Interconnecting and Packaging Electronic Circuits (IPC) has developed and published IPC 7351 \"Surface Mount Design and Land Pattern Standard\". This standard presents industry consensus on optimum dimensions based on empirical knowledge of fabricated land patterns. The standard also contains an excellent analysis of solder joints and their relation to component, PCB, and placement tolerances. A summary of the IPC land pattern design recommendations for solder reflow and solder wave processes are listed in table below. It is highly recommended that the PCB designer/SMT process engineer obtain the complete IPC 7351 standard (IPC)
The strict set of rules can be broken, but only with explicit stipulation of leniency and reasons written down. Why are these rules important? The IPC land pattern standard provides equations that allow the designer an easy way to decide what is too loose. You can then decide your own tolerance for individual land pattern features, based on your understanding of the application. If the standard were followed strictly, you would need to ask for permission to modify a land pattern design. The IPC Land Pattern standard does not state what is, of course, an impossible list of conditions.
People can use the IPC Land Pattern Standard as a working guide to creating a PCBS design with the least possible number of defects. Reducing defects lowers costs and increases customer satisfaction. It is good business if more people follow the rules you have adopted. 7211a4ac4a
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