丝印M74LS256P M74LS253P M74LS251P M74LS249P M74LS248P

贴插THS6022IPW-M34571G6FP-HD74LS251P-MA2S11100L-B

贴插M5661-A1C UPD4990AG M74LS251P NDV8501B2 N

贴片直插MA6061-15 M82C59AFP M74LS251P M80C50-71 5