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Why are the pin center distances of many chips 2.54mm? What consideration is this based on?
This is a question of metric units and English units.

2.54mm is equal to110 inch, or one tenth of an inch.

English units are widely used in circuit board design.

The most commonly used units are grinding and grinding. 1 mil =1100 inch.2.54 mm =100 mil, which is an integer.

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