SN75491N

Quadruple Darlington Transistor Indicator Driver, standard 14-pin plastic dual-in-line (DIP) package footprint manufactured by Texas Instruments. Houses four high-gain bipolar Darlington pairs rated to interface low-power logic signals directly with higher-current display anodes and filament networks. Extensively applied to drive multi-digit LED score displays, panel lamps, and localized diagnostic banks. Industry exact equivalents include National Semi LM75491N, Fairchild DS75491N, Sprague ULN2001A, and NTE2011. Historical equipment applications include Bally Eight Ball Deluxe score display modules, Williams High Speed diagnostic readouts, Rowe R-85 selection boxes, Atari Centipede internal tracking diagnostics, and Gottlieb Q*bert score panels.