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COM connection for ULN 2803

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qtommer

Member
In the ULN 2803 Darlington Transistor Array, there is a pin known as COM (pin 10) where all diodes are connected to.

From the datasheet, i can only identify that these diodes are clamping diodes.

Should I connect this pin 10 to VCC or GND?
What is the purpose of the diodes attached to the collectors?

Help is very much appreciated=)
 

Wp100

Well-Known Member
Hi,

Pin 10 should be connected to Vcc , it connects each diode across each relay to stop the emf from the relay coil.
 
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