IEC 61188-5-8:2007
印制板和印制板组件.设计和使用.第5-8部分:附件(结合区/接头)考虑要素.区域阵列组件(BGA, FBGA, CGA, LGA)

Printed boards and printed board assemblies - Design and use - Part 5-8: Attachment (land/joint) considerations - Area array components (BGA, FBGA, CGA, LGA)

标准号

IEC 61188-5-8:2007

发布日期

2007年10月

实施日期

2007年10月31日

废止日期

无

中国标准分类号

L30

国际标准分类号

31.180

发布单位

国际电工委员会

被代替标准

IEC 91/705/FDIS:2007

适用范围

This part of IEC 61188 provides information on land pattern geometries used for the surface attachment of electronic components with area array terminations in the form of solder balls, solder columns or protective coated lands. The intent of the information presented herein is to provide the appropriate size, shape and tolerances of surface mount land patterns to ensure sufficient area for the appropriate solder joint, and also allow for inspection, testing and reworking of those solder joints. Each clause contains a specific set of criteria such that the information presented is consistent, providing information on the component, the component dimensions, the solder joint design and the land pattern dimensions. The land pattern dimensions are based on a mathematical model that establishes a platform for a solder joint attachment to the printed board. The existing models create a platform that is capable of establishing a reliable solder joint no matter which solder alloy is used to make that joint (lead-free, tin lead, etc.). Process requirements for solder reflow are different depending on the solder alloy and should be analyzed so that the process is taking place above the liquidus temperature of the alloy, and remains above that temperature a sufficient time to form a reliable metallurgical bond. Area array land patterns do not use "land protrusion" concepts and attempt to match the characteristics of the physical and dimensional termination properties.

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