贴片直插SN74LS377N,SN74LS42MG,SN74LS641H,SN74LS541M,4
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SN74ALS574BDW SN74LS377DWR CD74HC299M SN74LS541DW
CD74FCT244M SN74LVC373ADW SN74ABT241ADW SN74LS541DWR
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