ULN2003

The ULN2003 is a high-voltage, high-current Darlington transistor array designed to control inductive loads such as relays, motors, and solenoids. It integrates seven Darlington pairs with built-in flyback diodes to protect against voltage spikes from inductive loads. The ULN2003 is compatible with TTL and CMOS logic levels and is used to interface with higher power components.

Key Features:

• Seven Darlington transistor pairs
• Integrated flyback diodes for protection against inductive spikes
• High-voltage capability up to 50V
• High-current capability up to 500mA per channel
• TTL and CMOS logic level compatible

Technical Specifications:

• Output Leakage Current (ICEX): 50 µA (max) at VCE = 50V
• Collector-Emitter Saturation Voltage (VCE(sat)): 0.9V
• Input Current (Ii(on)): 0.82 mA (typ)
• Input Voltage (Vi(on)): 2.4V
• DC Forward Current Gain (hFE): 1000
• Input Capacitance (Ci): 15 pF (typ)

Applications:

• Relay drivers
• Motor drivers
• Solenoid drivers
• LED drivers
• Microcontroller interfacing

Usage:

1. Connect input pins to the control signals from a microcontroller or logic circuit.
2. Connect output pins to the load (e.g., relay, motor).
3. Ensure proper connections to the power supply and ground.
4. Use additional flyback diodes if needed for extra protection against inductive loads.

Caution:

• Observe maximum voltage and current ratings to avoid damage.
• Verify correct connections to prevent short circuits.
• Follow all manufacturer guidelines for operation and handling.

Datasheet:
For detailed technical specifications, refer to the ULN2003 Datasheet.