IEC 61188-6-4:2019
印制板和印制板组件.设计和使用.第6-4部分:版图设计.从版图设计的角度看表面安装组件(SMD)尺寸图的一般要求
Printed boards and printed board assemblies - Design and use - Part 6-4: Land pattern design - Generic requirements for dimensional drawings of surface mounted components (SMD) from the viewpoint of l