ULN2003 Darlington Driver IC Specifications

General

• IC Type: High-voltage, high-current Darlington transistor array
• Number of Channels: 7
• Package Types: DIP-16, SOP-16
• Function: Interface low-voltage logic (TTL/CMOS) to high-current loads
• Common Applications: Driving relays, stepper motors, solenoids, LEDs

Electrical Characteristics

• Supply Voltage (VCC): 5 V – 50 V (collector supply for loads)
• Logic Input Voltage (VIH / VIL):
  • HIGH: ≥ 2.0 V
  • LOW: ≤ 0.8 V
• Output Current (per channel): 500 mA maximum
• Output Saturation Voltage (VCE(sat)): 1.0 V max at 350 mA
• Total Power Dissipation: 2.5 W (max)

Performance

• Input Current (per input): ~1.35 mA typical at 5 V logic
• High-voltage protection: Internal freewheeling diodes for inductive loads
• Temperature Range: −20°C to +85°C (operating)

Pins / Interface

• IN1–IN7: Logic inputs
• OUT1–OUT7: Darlington transistor outputs
• COM: Common freewheeling diode connection (for inductive loads)
• GND: Ground

Features

• Each channel can drive up to 500 mA
• Suitable for inductive and resistive loads
• TTL/CMOS compatible inputs
• Internal clamp diodes for inductive suppression
• Easily cascaded for multiple load control

Applications

• Driving 5V / 12V / 24V relays
• Stepper motor control (e.g., 28BYJ-48)
• LED and lamp driving
• Solenoid or small motor control with microcontrollers (Arduino, PIC, etc.)