ULN2003 is a high voltage and high current Darlington array IC. It contains seven open collector darlington pairs with common emitters. A darlington pair is an arrangement of two bipolar transistors.
Pin No
|
Function
|
Name
|
1
|
Input for 1st channel
|
Input 1
|
2
|
Input for 2nd channel
|
Input 2
|
3
|
Input for 3rd channel
|
Input 3
|
4
|
Input for 4th channel
|
Input 4
|
5
|
Input for 5th channel
|
Input 5
|
6
|
Input for 6th channel
|
Input 6
|
7
|
Input for 7th channel
|
Input 7
|
8
|
Ground (0V)
|
Ground
|
9
|
Common free wheeling diodes
|
Common
|
10
|
Output for 7th channel
|
Output 7
|
11
|
Output for 6th channel
|
Output 6
|
12
|
Output for 5th channel
|
Output 5
|
13
|
Output for 4th channel
|
Output 4
|