ULN2003

Description

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:

Connect input pins to the control signals from a microcontroller or logic circuit.
Connect output pins to the load (e.g., relay, motor).
Ensure proper connections to the power supply and ground.
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.