• ULN2003 is a 16 Pin IC, consisting of 7 Darlington pairs (each pair protected with suppression diode) and thus has the capability to handle a maximum of 7 loads (could be inductive).
• In simple words, we have 7 drivers in a single ULN2003 chip and thus can control maximum 7 loads.

• Each Darlington pair can handle a maximum of 500mA load, while the peak value is 600mA.
• Similarly, the maximum output voltage of each Darlington pair is 50V.
• In the below figure, you can see ULN2003 has 16 Pins, where inputs and their respective outputs are placed in front of each other (for ease of circuit design).
• Other than I/O Pins, we have Ground Pin where we need to provide 0V & Vcc (Common) Pin.

ULN2003 Pinout

• ULN2003 has 16 pins in total:
  • 7 Input pins (Pin # 1 to Pin # 7)
  • 7 Output pins (Pin # 10 to Pin # 16)
  • 1 Ground pin (Pin # 8)
  • 1 COM pin (Pin # 9)

                                       ULN2003 Datasheet