The Integrated Circuit 7403 is a Quad Dual Input NAND gate (Open Collector) in a 14-Pin Package (DIL / SMD)
Similiar Devices / Second Source
74F03
74ALS03
74LS03
74HC03
74HCT03
74LVX03

Here you may find Schematic Diagram for DIY, Datasheet, Pinout as well as further Information on the Integrated Circuit 7403

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