MC4044P内存芯片 MC4049UBDR2G MC404P MC-405 MC-405 25.6000K-A0 MC405 26.667MHZ MC-405 30.7200K-A0 MC-405 31.2500K-A3: ROHS MC-405 31.2500KA-A ROHS MC-405 31.2500KA-A: PURE SN