Explore ULN2803A pins, signal names, electrical functions and connection guidance for each package.
Select a pin to explore its connection
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Input of Darlington channel 1, through an internal 2.7 kΩ resistor.
Connect to a 5 V TTL/CMOS output; hold unused inputs LOW.
HIGH enables the matching output sink. Check the required input drive at the intended collector current.
Input of Darlington channel 2, through an internal 2.7 kΩ resistor.
Connect to a 5 V TTL/CMOS output; hold unused inputs LOW.
HIGH enables the matching output sink. Check the required input drive at the intended collector current.
Input of Darlington channel 3, through an internal 2.7 kΩ resistor.
Connect to a 5 V TTL/CMOS output; hold unused inputs LOW.
HIGH enables the matching output sink. Check the required input drive at the intended collector current.
Input of Darlington channel 4, through an internal 2.7 kΩ resistor.
Connect to a 5 V TTL/CMOS output; hold unused inputs LOW.
HIGH enables the matching output sink. Check the required input drive at the intended collector current.
Input of Darlington channel 5, through an internal 2.7 kΩ resistor.
Connect to a 5 V TTL/CMOS output; hold unused inputs LOW.
HIGH enables the matching output sink. Check the required input drive at the intended collector current.
Input of Darlington channel 6, through an internal 2.7 kΩ resistor.
Connect to a 5 V TTL/CMOS output; hold unused inputs LOW.
HIGH enables the matching output sink. Check the required input drive at the intended collector current.
Input of Darlington channel 7, through an internal 2.7 kΩ resistor.
Connect to a 5 V TTL/CMOS output; hold unused inputs LOW.
HIGH enables the matching output sink. Check the required input drive at the intended collector current.
Input of Darlington channel 8, through an internal 2.7 kΩ resistor.
Connect to a 5 V TTL/CMOS output; hold unused inputs LOW.
HIGH enables the matching output sink. Check the required input drive at the intended collector current.
Shared emitter return for all eight Darlington pairs.
Join the controller and load-supply grounds.
This lead carries the combined output current. Route its return with appropriate copper and low impedance.
Common cathodes of the eight internal inductive-load diodes.
Connect to the positive coil supply for inductive loads.
COM is not a logic supply or ground. The driver inputs do not require a separate VCC pin.
Collector of Darlington channel 8.
Connect to the low side of the load; its other side goes to the positive load rail.
Sinks current only. A HIGH input turns this output on; allow for its saturation voltage and package heating.
Collector of Darlington channel 7.
Connect to the low side of the load; its other side goes to the positive load rail.
Sinks current only. A HIGH input turns this output on; allow for its saturation voltage and package heating.
Collector of Darlington channel 6.
Connect to the low side of the load; its other side goes to the positive load rail.
Sinks current only. A HIGH input turns this output on; allow for its saturation voltage and package heating.
Collector of Darlington channel 5.
Connect to the low side of the load; its other side goes to the positive load rail.
Sinks current only. A HIGH input turns this output on; allow for its saturation voltage and package heating.
Collector of Darlington channel 4.
Connect to the low side of the load; its other side goes to the positive load rail.
Sinks current only. A HIGH input turns this output on; allow for its saturation voltage and package heating.
Collector of Darlington channel 3.
Connect to the low side of the load; its other side goes to the positive load rail.
Sinks current only. A HIGH input turns this output on; allow for its saturation voltage and package heating.
Collector of Darlington channel 2.
Connect to the low side of the load; its other side goes to the positive load rail.
Sinks current only. A HIGH input turns this output on; allow for its saturation voltage and package heating.
Collector of Darlington channel 1.
Connect to the low side of the load; its other side goes to the positive load rail.
Sinks current only. A HIGH input turns this output on; allow for its saturation voltage and package heating.
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