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The ULN2003 devices have a 10.5-kΩ series base resistor to allow operation directly from CMOS devices that use supply voltages of 6 V to 15 V. The required input current of the ULx2004A device is below that of the ULN2003A devices, and the required voltage is less than that required by the ULN2002A device. 

The ULN2002A device is designed specifically for use with 14-V to 25-V PMOS devices. Each input of this device has a Zener diode and resistor in series to control the input current to a safe limit. The ULx2003A devices have a 2.7-kΩ series base resistor for each Darlington pair for operation directly with TTL or 5-V CMOS devices.

 Features :

• 500-mA-Rated Collector Current (Single Output)
• High-Voltage Outputs: 50 V
• Output Clamp Diodes
• Inputs Compatible With Various Types of Logic
• Relay-Driver Applications

Applications :

• Relay Drivers
• Stepper and DC Brushed Motor Drivers
• Lamp Drivers
• Display Drivers (LED and Gas Discharge)
• Line Drivers
• Logic Buffers
• Inverter

ULN2003 Pin Configuration and Functions :

Download ULN2003 Datasheet PDF