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Question

What do the squared values or characters in the outline drawings of packages mean?

Answer

Package

In some package outlines, geometrical dimensioning and tolerancing is used to indicate shape tolerance, in addition to size tolerance. Geometrical tolerancing is defined by ISO, JIS, ASME, etc. For example, JIS defines it from JISB0021. Squares only containing values represent theoretically-accurate measurements.

ex. DFN(PLP)1010-4

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