IPC-7351B Naming Convention for Standard SMT Land Patterns

IPC-7351B Naming Convention for Standard SMT Land Patterns

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IPC-7351 Zero Orientation with Pin 1 Upper Left

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Naming Conventions

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The X (capital letter X) is used instead of the word “by” to separate two numbers such as height X width

M - Density Level A: Maximum (Most) Land Protrusion—For low-density product applications
N - Density Level B: Median (Nominal) Land Protrusion—Products with a moderate level of component density
L - Density Level C: Minimum (Least) Land Protrusion—High component density typical of portable and hand-held product applications

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20_24N - 24 pin locations with 20 pins populated. Pin numbering follows pin locations (pins number 1 to 24).

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G