SN74LS641DWR SN74LS641DW SN74LS641-1NE4 SN74LS641-1N SN74LS641-1DWR SN74LS641-1DW SN74LS641 SN74LS640NSR SN74LS640NS SN74LS640NE4 SN74LS641H
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