Hard metric dimensions are employed in accordance with the JEDEC JC-11 "Metrication Policy", SPP-003B (February 1998). MetricationĪll PCB footprint dimensions are given in metric units. The IPC-7351 standard: ”Generic Requirements for Surface Mount Design and Land Pattern Standard” supersedes IPC-SM-782A (Amendments 1 & 2). IPC-7351 compliant footprints are found in Altium Designer 6.3 version libraries and later versions. Only ‘nominal’ level footprints are drawn for BGA and CGA packages. These designation letters are appended to Altium library and footprint names to identify the density level. High-Density applications with a ‘minimum’ footprint size, designated by the letter ‘L’ Medium-Density applications with a ‘moderate’ footprint size, designated by the letter ‘N’ Low-Density applications with a ‘maximum’ footprint size, designated by the letter ‘M’ Under the IPC-7351 standard, three different footprints levels are specified: The pad diameters for the BGA and CGA packages are defined by the etched copper, rather than by the solder mask. Land patterns for surface mount components follow the assumptions and equations found in standards IPC-SM-782A, Amendment 1 (October 1996) and Amendment 2 (April 1999) and IPC-7351 (February 2005). IPC claims that these land patterns are transparent to the manufacturing process but recommends that they should be optimized to suit the soldering type (wave, reflow) and assembly (components mounted on one or both sides of the board, etc). PCB footprints for surface mount packages are built to the standards developed by IPC - "Association Connecting Electronics Industries". Vendor Codes Naming Conventions PCB footprints - surface mount Vendor Codes used in Manufacturer libraries. Altium Legacy LibrariesĪdditional, independently developed, libraries and ancillary support files. The components can be accessed via a browser, or they can be accessed from the Vaults panel in Altium Designer. Current and new components are delivered via the Altium Content Vault, along with reference designs and templates. Altium provides an extensive range of components to accompany Altium products.
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