What is New in IPC-7351C.pdf - 第30页

PC B L ibr ar i es Pr e s ents : Wh at is N ew i n IPC- 7351C JED E C D im ensional Cha r a ct e r s

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PCB Libraries Presents:
What is New in IPC-7351C
EIA Component Dimensions vs: JEDEC
Dimensional Letters
EIA & JEDEC
PCB Libraries Presents:
What is New in IPC-7351C
JEDEC Dimensional Characters
PCB Libraries Presents:
What is New in IPC-7351C
Extended Names Eliminate Duplication I
• The original IPC-7351 footprint naming convention does not include Gull Wing
component lead tolerances, Thermal Pad sizes, BGA Ball sizes or Chip Terminal
Lead Width into account. Therefore, the same component with different
tolerances can produce a different land size and spacing with the same
footprint name.
• A footprint name of SOP50P710X120-14Ncan have version A, B, C, D which do
not indicate the variances in Thermal Tab or Lead Length
• There are 3 component features that affect the footprint name
• Square/Rectangle Thermal Tab Size = SOP50P710X120-14T300/T300X500
• Gull Wing Lead Length Tolerance = SOP50P710X120-14L50
• BGA Ball Size = BGA121C50P11X11_600X600X100B23
• Chip Terminal Lead Width = CAP3216X135L45
• For component mfr. recommended footprint drop the environment level
character after the pin qty. - SOP50P710X120-14
Land Pattern Naming Convention