IC快速检索：
型号 / 厂家，封装，批号，备注，订购
M74HC251Msmdtube / ST 94+,,,010-62106431 订购 PDF文档
M74HC251RM / ST,,00+,010-66001623/66001621 订购 PDF文档
M74HC253B1 / SGS,,,特价 订购 PDF文档
M74HC253M / ,,07+,原装货欢迎来电 订购 PDF文档
M74HC253M1R / FAIRCHILD,,02+,原装现货 订购 PDF文档
M74HC254BI / ,,05+,010-66001623/66001621 订购 PDF文档
M74HC257M / ST,,04+,010-66001623/66001621 订购 PDF文档
M74HC257M1R / ST,DIP,01+,全新原装，深圳/香港现货 订购 PDF文档