A Darlington transistor array is an integrated circuit (IC) that contains multiple Darlington transistor pairs within a single package. These arrays are designed to simplify circuit design by providing multiple high-gain Darlington transistors in a compact form, allowing for the control of multiple loads such as relays, LEDs, motors, or other high-current devices using low-power input signals. One of the most popular examples of Darlington transistors array are the ULN2003 and ULN2803 series, which contains NPN Darlington pairs in a single package.