Electronics Forum | Thu Dec 05 08:32:56 EST 2019 | scotceltic
Thank you for the quick response. Can you tell me the exact verbage from IPC 2221B regarding via to via spacing ? I have Revision A and couldn't find anything that refers to this ? Thanks again for your help
Electronics Forum | Thu Dec 05 02:15:12 EST 2019 | sssamw
IPC 2221B mentions a minimum clearance of 0.5 mm between adjacent holes. A drill-to-drill spacing of 20 mils is a standard value in manufacturer design rules. For small annular rings and pad-to-pad clearance, the minimum via distance is often defin
Industry News | 2016-02-23 20:21:43.0
IPC – Association Connecting Electronics Industries® announces the release of the IPC-2221B Gerber Coupon Generator, a new annual subscription service for IPC members. The IPC-6012C-TC Test Coupon Addendum to the IPC-6012C, Qualification and Performance Specification for Rigid Printed Boards, allows a user or supplier to enter into an agreement to use the new IPC-2221B Appendix A test coupon designs for acceptance of production lots. Not doing so results in micro section evaluations based on outdated test designs going back to the late 1980s, which do little to properly assess modern technology needs.
Industry News | 2018-05-22 12:19:27.0
IPC – Association Connecting Electronics Industries® would like to announce the release of additional test coupons for the IPC-2221B Gerber Coupon Generator, an exclusive annual subscription service for IPC member companies. The IPC-2221B Gerber Coupon Generator subscription service is the only service providing new, industry approved test coupons addressing blind, buried, stacked and staggered via structures. The most commonly used coupons for product acceptance are “AB,” “AB/R” and “D” which were introduced in 2016.
| https://www.eptac.com/faqs/ask-helena-leo/ask/pcb-design-for-conformal-coating
: IPC-2221B, Generic Standard on Printed Board Design, page 37, Section 4.6.2 Conformal Coating, has the information you are looking for relative to the application to printed circuit boards and what should be considered. In Section
