芯片封装尺寸中的BSC是什么意思_尺寸_误差

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芯片封装尺寸

如上图所示，电子元件的封装尺寸图常常会看到BSC，那BSC是什么意思呢？

芯片封装尺寸中的BSC是什么意思_尺寸_误差芯片封装尺寸中的BSC是什么意思_尺寸_误差通讯

大略，老套路，搜索引擎奉养...

（图片来自网络侵删）

一番搜索之后，列出下面几个有代价的结果：

一说BSC是指基本值(Basic), 其它还有TYP(范例值), REF参考值, 单位一样平常会在资料里解释。
二说是Basic Spacing between Centers，三说BSC不是单位，意思是没有偏差的，也便是说这间距必须符合前面的值，这个一样平常在指定两个脚之间的间隔时涌现，比如0.050BSC便是说两脚间距必须是50mil也便是0.050英寸Solution 1:

BSC means "Basic Space Between Center".

The "Drawing Requirements Manual" by Jerome Lieblich (W/C is in compliance with Mil Std 100F) defines BSC as a numerical value that is used to describe the theoretically exact size, shape, or location of a feature or datum target; this is shown on drawings enclosed in a rectangle. It is the basis for determining which permissible variations are established by tolerances on other dimensions.

Solution 2:

"BSC" is short for BASIC. It is a numerical value used to describe the theoretical exact size, shape or location of a feature or datum target. It is the basis on which permissible variations are established by tolerances on other dimensions, in notes, or by feature control symbols. Basic dimensions are displayed on the drawing enclosed in a rectangle.

看了这些搜索结果，答案也就呼之欲出了，

总结：实际上便是哀求这个尺寸值，必须是准确的，不能有偏差，以是不存在 typ, min和max值。