ULN2003 Driver

Wiring Connections:

• Pin 1 to Pin 7: Inputs for control signals (usually connected to microcontroller or logic circuit outputs).
• Pin 8: Ground (GND) – Connect to the common ground of the circuit.
• Pin 9 to Pin 15: Outputs for driving loads (each corresponding to an input pin).
• Pin 16: Positive power supply (VCC) – Connect to the voltage source appropriate for your load (up to 50V).

Power:

• Operating Voltage:
  • Logic Supply (VCC):  5V to 15V
  • Load Supply: Up to 50V (depends on the load requirements)
• Power Consumption: Low power consumption in standby mode; power consumption depends on the load current.

Input and Output:

• Input:
  • Logic signals from a microcontroller or digital circuit are applied to the input pins (Pins 1 to 7).
  • The input signal controls the state of the corresponding output pin.
• Output:
  • The outputs (Pins 9 to 15) drive the connected loads. When an input pin receives a high signal, the corresponding output pin turns on and allows current to flow through the connected load.

Physical Characteristics:

• Size:
  •  available in a 16-pin DIP package (approx. 0.6″ wide) or SMD package for surface-mount applications.
• Mounting:
  • DIP package can be inserted into standard breadboards or PCBs.
  • SMD package is soldered directly onto PCBs.

Technical Specifications:

• Input Voltage Range: 5V to 15V
• Output Voltage Range: Up to 50V
• Output Current per Channel: Up to 500mA
• Protection: Built-in flyback diodes to protect against voltage spikes from inductive loads.

Additional Features:

• Built-In Protection: Includes protection diodes for handling inductive loads, making it suitable for driving relays, motors, and other inductive devices.
• High Gain: Darlington pairs provide high current gain, enabling control of high-current loads with low input current.

How to Use:

1. Connect the Power:
   • Connect the VCC pin (Pin 16) to your load power supply (up to 50V).
   • Connect the GND pin (Pin 8) to the common ground of your circuit.
2. Wiring the Inputs and Outputs:
   • Connect your control signals to the input pins (Pins 1 to 7). These signals will control the corresponding outputs.
   • Connect your load to the output pins (Pins 9 to 15). Ensure the load’s power supply matches the voltage connected to VCC.
3. Verify Connections:
   • Ensure all connections are secure and correctly matched.
4. Test Operation:
   • Apply input signals and observe the corresponding outputs to confirm that the driver operates as expected and controls the load effectively.

The ULN2003 is a versatile Darlington transistor array used for driving high-current loads with logic-level signals. Its integrated flyback diodes provide protection for inductive loads, and its high current handling capability makes it suitable for a wide range of applications, including controlling motors, relays, and other high-current devices. The ULN2003 simplifies interfacing between low-current logic circuits and higher-current loads, providing a reliable and easy-to-use solution for many electronic projects.