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Products > Packages > Outline drawing information >

Tolerance of the center position of package w


Geometric tolerance of IC package outline drawing

Tolerance of the center position of package w

Symbols for geometric tolerancewCommon tolerance value of package central location gradeS1st datumA2nd datum

Example: w=0.20
Figure:Example
The seating plane (1st datum S) and all the central terminal locations show that, when straight line A (2nd datum A) obtained by Least Squares Method is used as the standard, fluctuation of the central location of the package for the length direction (D) is within ±0.10mm of 2nd datum A.
See "Measuring method for Package Dimensions of BGA EIAJ ED-7304"