BETAPIN 1 · Logic inputs
Darlington input1B
Function
Drives channel 1 through an internal 2.7 kΩ base resistor.
How to connect
Connect to a 5 V logic output. Tie unused inputs LOW.
Electrical note
HIGH turns the corresponding low-side output on.
Seven-channel Darlington driver
ULN2003A Pinout
Explore ULN2003A pins, signal names, electrical functions and connection guidance for each package.
Package view
16Physical pins
ULN2003ANPDIP-16
Manufacturer-referencedTexas Instruments
Pin diagram
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ULN2003ANPDIP-16Top view
ULN2003ADSOIC-16Top view
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PIN 2 · Logic inputs
Darlington input2B
Function
Drives channel 2 through an internal 2.7 kΩ base resistor.
How to connect
Connect to a 5 V logic output. Tie unused inputs LOW.
Electrical note
HIGH turns the corresponding low-side output on.
PIN 3 · Logic inputs
Darlington input3B
Function
Drives channel 3 through an internal 2.7 kΩ base resistor.
How to connect
Connect to a 5 V logic output. Tie unused inputs LOW.
Electrical note
HIGH turns the corresponding low-side output on.
PIN 4 · Logic inputs
Darlington input4B
Function
Drives channel 4 through an internal 2.7 kΩ base resistor.
How to connect
Connect to a 5 V logic output. Tie unused inputs LOW.
Electrical note
HIGH turns the corresponding low-side output on.
PIN 5 · Logic inputs
Darlington input5B
Function
Drives channel 5 through an internal 2.7 kΩ base resistor.
How to connect
Connect to a 5 V logic output. Tie unused inputs LOW.
Electrical note
HIGH turns the corresponding low-side output on.
PIN 6 · Logic inputs
Darlington input6B
Function
Drives channel 6 through an internal 2.7 kΩ base resistor.
How to connect
Connect to a 5 V logic output. Tie unused inputs LOW.
Electrical note
HIGH turns the corresponding low-side output on.
PIN 7 · Logic inputs
Darlington input7B
Function
Drives channel 7 through an internal 2.7 kΩ base resistor.
How to connect
Connect to a 5 V logic output. Tie unused inputs LOW.
Electrical note
HIGH turns the corresponding low-side output on.
PIN 8 · Supply
Common emitterE
Function
Shared emitter and substrate return for all seven channels.
How to connect
Connect to load-supply ground and controller ground.
Electrical note
This is the high-current return path; route it appropriately.
PIN 9 · Flyback protection
Clamp diode commonCOM
Function
Common cathodes of the seven internal flyback diodes.
How to connect
Connect to the positive relay or motor-coil supply for inductive loads.
Electrical note
COM is not a logic supply pin and is not ground.
PIN 10 · Collector outputs
Open-collector driver7C
Function
Collector output of channel 7.
How to connect
Connect between the load and the IC; the other load terminal goes to the positive load supply.
Electrical note
Sinks current only. Allow Darlington voltage drop and package heating.
PIN 11 · Collector outputs
Open-collector driver6C
Function
Collector output of channel 6.
How to connect
Connect between the load and the IC; the other load terminal goes to the positive load supply.
Electrical note
Sinks current only. Allow Darlington voltage drop and package heating.
PIN 12 · Collector outputs
Open-collector driver5C
Function
Collector output of channel 5.
How to connect
Connect between the load and the IC; the other load terminal goes to the positive load supply.
Electrical note
Sinks current only. Allow Darlington voltage drop and package heating.
PIN 13 · Collector outputs
Open-collector driver4C
Function
Collector output of channel 4.
How to connect
Connect between the load and the IC; the other load terminal goes to the positive load supply.
Electrical note
Sinks current only. Allow Darlington voltage drop and package heating.
PIN 14 · Collector outputs
Open-collector driver3C
Function
Collector output of channel 3.
How to connect
Connect between the load and the IC; the other load terminal goes to the positive load supply.
Electrical note
Sinks current only. Allow Darlington voltage drop and package heating.
PIN 15 · Collector outputs
Open-collector driver2C
Function
Collector output of channel 2.
How to connect
Connect between the load and the IC; the other load terminal goes to the positive load supply.
Electrical note
Sinks current only. Allow Darlington voltage drop and package heating.
PIN 16 · Collector outputs
Open-collector driver1C
Function
Collector output of channel 1.
How to connect
Connect between the load and the IC; the other load terminal goes to the positive load supply.
Electrical note
Sinks current only. Allow Darlington voltage drop and package heating.