As an Amazon Associate, we earn from qualifying purchases. N74LS640N - Signetics Signetics . N74LS640N Gallery Attributes Brand name, Manufacturer name, ManufacturerSignetics Extra Product NameN74LS640N - Signetics moq, multiple1 MPN, SKUN74LS640N qtyInStock0 snippetN74LS640N In-Stock. Request a quote for the part number# N74LS640N. Call 877-240-8595 to order. Same day shipping on in-stock parts. Distributor offers SellerSKUMOQIn stockMultiplePrices 4 Star ElectronicsN74LS640N11 1SourceN74LS640N11