To use the guidelines for PCB footprint design, you should look for
While Rev B allowed ambiguous unit mixing, Rev C strongly prioritizes metric units (millimeters) while providing imperial equivalents for legacy US designs.
For decades, the industry standard governing these critical dimensions has been the IPC-7351 series. With the release of IPC-7351C, the standard has evolved to meet the demands of modern miniaturization and manufacturing precision.
Generic Guideline for Surface Mount Design and Land Pattern Standard ) in 2023 instead. PCB Libraries
It is important to note that the IPC committee eventually decided to transition much of the work from the IPC-7351C draft into a new standard: PCB Libraries
Revision C introduces more generous and clear courtyard rules to prevent SMT placement machine collisions. The "courtyard" in Rev C often extends further than in Rev B to accommodate nozzle tooling.
Correct land patterns ensure "First Pass Yield." If the pads are calculated correctly using the IPC-7351C formulas, components will self-align during the surface tension phase of reflow soldering. Incorrect footprints lead to open circuits, shorts, and expensive rework.
The IPC-7351C (Generic Requirements for Surface Mount Design and Land Pattern Standard) is a pending or updated revision of the standard used to define PCB footprints. While IPC-7351B remains the most widely cited current version, the "C" revision introduces critical changes to pad geometry and calculation methods. Key Articles and Resources
To use the guidelines for PCB footprint design, you should look for
While Rev B allowed ambiguous unit mixing, Rev C strongly prioritizes metric units (millimeters) while providing imperial equivalents for legacy US designs.
For decades, the industry standard governing these critical dimensions has been the IPC-7351 series. With the release of IPC-7351C, the standard has evolved to meet the demands of modern miniaturization and manufacturing precision. ipc-7351c pdf
Generic Guideline for Surface Mount Design and Land Pattern Standard ) in 2023 instead. PCB Libraries
It is important to note that the IPC committee eventually decided to transition much of the work from the IPC-7351C draft into a new standard: PCB Libraries To use the guidelines for PCB footprint design,
Revision C introduces more generous and clear courtyard rules to prevent SMT placement machine collisions. The "courtyard" in Rev C often extends further than in Rev B to accommodate nozzle tooling.
Correct land patterns ensure "First Pass Yield." If the pads are calculated correctly using the IPC-7351C formulas, components will self-align during the surface tension phase of reflow soldering. Incorrect footprints lead to open circuits, shorts, and expensive rework. Download the standard : Obtain a copy of
The IPC-7351C (Generic Requirements for Surface Mount Design and Land Pattern Standard) is a pending or updated revision of the standard used to define PCB footprints. While IPC-7351B remains the most widely cited current version, the "C" revision introduces critical changes to pad geometry and calculation methods. Key Articles and Resources