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The ULN2003A is an integrated circuit containing seven NPN Darlington transistor pairs. It allows microcontrollers like Arduino or Raspberry Pi to control high-power loads, supporting up to 50V and 500mA per output. It features internal flyback diodes for inductive switching.
Key Features and Specifications
• Architecture: 7 independent NPN Darlington pairs, ideal for driving heavy loads.
• Voltage and Current Ratings: Up to 50V output voltage and 500mA current per channel.
• Logic Compatibility: Inputs include 2.7kΩ resistors, making them directly compatible with TTL and 5V CMOS devices.
• Inductive Protection: Includes built-in suppression (flyback) diodes designed for inductive loads.
• Paralleling: Channels can be wired in parallel to handle higher current loads.
Common Applications
• Stepper Motors
• Relays and Solenoids
• High-current LEDs
• Lamp and Display Drivers
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555 IC Based
Power Supplies
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