Introduction to the LP library of PCB matrix IPC-7351

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• I'm looking for description about these libraries which category of component each library

I'm looking for description about these libraries which category of component each librarycovers or any other specifics, And what begining letter stands. In LP viewer found PLB library files: PCBM-STARTER.PLB09BGA7351B.PLB09SMN7351B.PLB09SMM7351B.PLB09SML7351B.PLB09CNA7251.PLB09CNB7251.PLB09

Cnc7251.plb09cnp7small. plb09tha7large. plb09thb7large. plb09thc7large. plb09thp7large. plb09   Answer

PCBM-STARTER= BGA & SMN combined with MFR data added. CN = connectors Th = through-hole SM = Surface Mount A = Most Annular Ring for Through-holeB = Nominal Annular Ring for Through-holeC = Least Annular Ring for Through-holeP = Proportional (The Annular Ring grows larger as the hole gets bigger for Through-hole) SML = Least SMT PadSMN = Nominal SMT PadSMM = Most SMT Pad BGA only comes in"Nominal"Format Here, most, nominal, and least are a thought standard encapsulated in production. Most is used for boards with low density (maximum pad size), nominal is used for moderate density (medium pad size), and least is used for high density boards (minimum pad size ).