So if you have anything that anything more than 5V 80mA to work, then this IC would be the right choice for you. This IC is commonly used to drive Relay modules, Motors, high current LEDs and even Stepper Motors. Note: Complete Technical Details can be found at the ULN2003 datasheet given at the end of this page. Available in 16-pin DIP, TSSOP, SOIC packages.Can be directly controlled by logic devices like Digital Gates, Arduino, PIC etc.All seven Output pins can be connected to gather to drive loads up to (7×500mA) ~3.5A.Contains 7 high-voltage and high current Darlington pairs.Each output pin will be connected to ground only when its respective input pin is high(+5V) Used as test pin or Voltage suppresser pin (optional to use) Seven Input pins of Darlington pair, each pin is connected to the base of the transistor and can be triggered by using +5V For example a motor that requires 9V and 300mA to run cannot be powered by an Arduino I/O hence we use this IC to source enough current and voltage for the load. ULN2003 IC is one of the most commonly used Motor driver IC generally used when we need to drive high current loads using digital logic circuits like Op-maps, Timers, Gates, Arduino, PIC, ARM etc.
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