ULN2068B datasheet by STMicroelectronics

ULN2068B Frequently Asked Questions (FAQs)

• What is the maximum current that each output can handle?
  The maximum current that each output can handle is 500mA. However, it's recommended to derate the current to 350mA for reliable operation.
• How do I protect the ULN2068B from back-EMF when driving inductive loads?
  You can add a flyback diode (e.g., 1N4007) in parallel with the inductive load to protect the ULN2068B from back-EMF. The diode should be connected in the reverse direction of the load current.
• What is the minimum input voltage required for the ULN2068B to function properly?
  The minimum input voltage required is 4.5V, but it's recommended to use a minimum of 5V for reliable operation.
• Can I use the ULN2068B to drive a relay?
  Yes, the ULN2068B can be used to drive a relay. However, ensure that the relay's coil current is within the ULN2068B's output current rating (500mA). Also, add a flyback diode to protect the ULN2068B from back-EMF.
• How do I calculate the power dissipation of the ULN2068B?
  The power dissipation of the ULN2068B can be calculated using the formula: Pd = (Vin - Vout) x Iout, where Vin is the input voltage, Vout is the output voltage, and Iout is the output current.