The maximum current that can be sunk by each output of the ULN2004APG is 500mA.
No, the ULN2004APG is designed as a low-side switch, and it's not recommended to use it as a high-side switch due to its internal circuitry and voltage ratings.
You can use a flyback diode (such as 1N4007) in parallel with the inductive load to protect the ULN2004APG from back-EMF. The diode should be connected in a way that it conducts when the output is turned off.
The minimum input voltage required for the ULN2004APG to function properly is 2.4V, but it's recommended to use a minimum of 3V to ensure reliable operation.
Yes, the ULN2004APG can be used to drive a relay, but you need to ensure that the relay's coil current is within the output current rating of the ULN2004APG (500mA per output). You may also need to add a flyback diode to protect the ULN2004APG from back-EMF.
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