ULN2004ADRG4 datasheet by Texas Instruments

ULN2004ADRG4 Frequently Asked Questions (FAQs)

• What is the maximum current that each Darlington pair can handle?
  The maximum current that each Darlington pair can handle is 500mA. However, it's recommended to derate the current to 300mA for reliable operation.
• How do I calculate the base current for each Darlington pair?
  The base current for each Darlington pair can be calculated using the formula: Ib = Ic / (β * β), where Ib is the base current, Ic is the collector current, and β is the current gain of the transistor.
• What is the maximum voltage that can be applied to the input pins?
  The maximum voltage that can be applied to the input pins is 15V. Exceeding this voltage may damage the device.
• Can I use the ULN2004ADRG4 as a relay driver?
  Yes, the ULN2004ADRG4 can be used as a relay driver. However, it's essential to ensure that the relay coil current is within the maximum current rating of the device.
• How do I protect the ULN2004ADRG4 from back-EMF when driving inductive loads?
  To protect the ULN2004ADRG4 from back-EMF when driving inductive loads, a flyback diode or a TVS diode can be used to absorb the voltage spike generated by the inductive load.