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全新74LS240DBR 74LS221NSR 74LS221DR2 74LS20RPEL 74LS20FP-E
贴片直插SN74LS240DWR,SN74LS221DR2,SN74LS221ML1,4
SN74LS221DR2丝印:LS221 SOP-16 逻辑-振荡器 MOTO正品 可直拍