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74LS688DWR274LS682DWR274LS640F74LS682
74LS640BN74LS641NS74LS641FP74LS642NS
74LS393FPEL74LS374RPEL74LS374N全新
74LS64174LS64074LS64274ls644
74LS640DWR74LS6441JS642LS
74LS629N74LS639N74LS640M74LS640N
原厂SN74LS640N原装INVERT
收发器八路总线HD74LS640P
收发器总线正品SN74LS640N
MC74HC138ANSN74LS640N芯片TA8142AP
收发器丝印总线SN74LS640DWR
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