ULN2003

Description

ULN2003 is a relay driver  IC consisting of a darlington array. It is made up of seven open collector darlington pairs with common emitter. Moreover, ULN2003A has a capability of handling seven different Relays simultaneously. A single darlington pair consists of two bipolar transistors and operates in the range of 500mA to 600mA current.

• ULN2003 has 16 pins in total out of which there are:
  • 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)
• The pin diagram for ULN2003 is shown in the figure below.

Its pin division on the basis of functions associated with them is shown in above figure. Further description will be given in this tutorial later. In short the pins can be divided into four different categories i.e. input pins, output pins, ground pin and common pin. These pins along with their positions are shown below.