ULN2069B datasheet by STMicroelectronics

ULN2069B Frequently Asked Questions (FAQs)

• What is the maximum current that each output can sink?
  The ULN2069B can sink up to 500mA per output, but it's recommended to limit it to 350mA for reliable operation.
• How do I protect the ULN2069B from back-EMF when driving inductive loads?
  Use a flyback diode (e.g., 1N4007) in parallel with the inductive load to absorb the back-EMF. This diode should be rated for the maximum voltage and current of the load.
• What is the minimum input voltage required for the ULN2069B to function properly?
  The ULN2069B can operate with input voltages as low as 3.5V, but it's recommended to use a minimum of 4.5V for reliable operation.
• Can I use the ULN2069B to drive a relay?
  Yes, the ULN2069B can be used to drive a relay, but ensure the relay's coil voltage and current ratings are within the ULN2069B's output capabilities.
• How do I calculate the power dissipation of the ULN2069B?
  Use the formula: Pd = (Vin - Vout) x Iout, where Vin is the input voltage, Vout is the output voltage, and Iout is the output current. Ensure the calculated power dissipation is within the device's thermal rating.