型号 / 厂家，封装，批号，备注，订购

SP1490ECN-L/TR / Sipex,Datasheet,07+,Full Duplex RS-485 T 订购 PDF文档

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SP1491EENTR-LF / ,,最新批号,原装现货 订购 PDF文档

SP1491EEP / Sipex,Datasheet,06/07+,Full Duplex RS-485 T 订购 PDF文档