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As chip sizes continue to shrink and system features continue to expand, it becomes increasingly difficult for designers to remember board layout parameters and specification requirements. The newly revised IPC-2221B "General Standard for Printed Board Design" covers various requirements in the design of various types of printed circuit boards, such as testing, through hole protection, test board design, and surface treatment.
John Perry, IPC technical project manager, said: "The latest revised standards can help designers choose the way to surface treatment. The newly expanded data chart makes it easy to query various surface treatment parameters."
The update of the electrical test part of the new standard reflects the industry's emphasis on product quality and reliability. Perry said, "The new additions to electrical testing introduce test methods such as continuous testing, high voltage testing, and impedance testing. In general, one test method is unlikely to meet all testing requirements, and designers are eager to choose. Two or three test methods to meet customer requirements.
Through-hole protection is particularly important due to the increased number of vias on the board. IPC-2221B also adds to this aspect. Another important part of the update in this standard is the acceptability of the test board, periodic conformance testing, etc. in Appendix A. The performance specifications are in accordance with IPC-6012C Rigid Printed Board Identification and Performance Specifications and IPC-6013C Flexibility. Printed board identification and performance specifications.
For example, AB/R test boards for metal via evaluation and thermal stress testing have been designed to include blind vias, buried vias, and micro via structures. The design of the AB/R test board and the other eight test boards in Appendix A is based on the IPC-2221 test board introduced 23 years ago.
The release of IPC-2221B marks the completion of three important standards for printed circuit board design. Perry said: "We have created a three-game winning streak - two years ago launched IPC-2222A rigid organic printed board design sub-standard, a year ago released IPC-2223C flexible printed board design sub-standard, IPC- The release of 2221B marks the complete update of the IPC-2220 series design standards."
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