PCB Libraries, Inc. | https://www.pcblibraries.com/forum/topic785&OB=DESC.html
Jeff.M Report Post Thanks(0) Quote Reply Posted: 16 Feb 2021 at 11:10am I believe the formula you're referring to (Smin + Stol[RMS]) dates back to the IPC-SM-782 document from 1993
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/RSS_creating-a-centroid-cpl-file-bottom-side-data_topic2611.xml
. The IPC-SM-782 was around for 18 years with Pin 1 Lower Left. One person (Jamie Smith) who never attended any Land Pattern meetings or any IPC development meetings attended the 2004 IPC APEX meeting and he questioned the Pin 1 Zero Component Orientation should be changed to the Upper
PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/ipc7351-smd-pth-reference-calculators_topic785&OB=ASC_page2.html
Jeff.M Report Post Thanks(0) Quote Reply Posted: 16 Feb 2021 at 11:10am I believe the formula you're referring to (Smin + Stol[RMS]) dates back to the IPC-SM-782 document from 1993
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/ipc7351-smd-pth-reference-calculators_topic785&OB=ASC_page2.html
Jeff.M Report Post Thanks(0) Quote Reply Posted: 16 Feb 2021 at 11:10am I believe the formula you're referring to (Smin + Stol[RMS]) dates back to the IPC-SM-782 document from 1993
PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/ipc7351-smd-pth-reference-calculators_topic785_post9685.html
Jeff.M Report Post Thanks(0) Quote Reply Posted: 16 Feb 2021 at 11:10am I believe the formula you're referring to (Smin + Stol[RMS]) dates back to the IPC-SM-782 document from 1993
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/v2020-library-expert-enterprise-features_topic2423.html
) IPC has been promoting adding 0.05 mm (2 mil) annular ring to every pad since IPC-SM-782's release in March 1987. The concept was that the fabrication etching process could "over-etch" and therefore reduce the resulting pad size
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/topic2423&OB=DESC.html
) IPC has been promoting adding 0.05 mm (2 mil) annular ring to every pad since IPC-SM-782's release in March 1987. The concept was that the fabrication etching process could "over-etch" and therefore reduce the resulting pad size
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/v2020-library-expert-enterprise-features_topic2423_post9968.html
) IPC has been promoting adding 0.05 mm (2 mil) annular ring to every pad since IPC-SM-782's release in March 1987. The concept was that the fabrication etching process could "over-etch" and therefore reduce the resulting pad size
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/RSS_library-expert-2016-09-released_topic1934.xml
modulesCalculator:Updated the Land Pattern Naming Convention for 2-pin Chip, Molded Body and SOD parts to match IPC-7351CUpgraded 2-pin parts for the silkscreen to map to the real component body outlineLibrary
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/standard-chip-package-case-codes-dimensions_topic2440_post11864.html
& Dimensions Posted: 07 Feb 2022 at 10:01am IPC-7351B contains the 3-Tier Density Levels for Land Patterns. However, that document is 12 years old and out of date and it took information from the 1987 IPC-SM-782 which is obsolete
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