蔡健雅好听的歌曲大全:The description of LP Viewer PLB Libary

来源:百度文库 编辑:九乡新闻网 时间:2024/05/04 18:31:25
 I'm looking for description about these libraries which category of component each librarycovers or any other specifics, and what begining letter stands for. In LP Viewer found PLB library files:  PCBM-STARTER.PLB09BGA7351B.PLB09SMN7351B.PLB09SMM7351B.PLB09SML7351B.PLB09CNA7251.PLB09CNB7251.PLB09CNC7251.PLB09CNP7251.PLB09THA7251.PLB09THB7251.PLB09THC7251.PLB09THP7251.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  这里的Most ,Nominal , Least说的是封装在制作时的一个思维标准。Most 用于密度小的板子(pad 尺寸最大),Nominal用于密度适中的(pad尺寸中等),Least适用于密度大板子(pad尺寸最小)。