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ULN2803C: ULN2803CDWR power consumption.

Nitesh Malik
Prodigy 40 points
Part Number: ULN2803C

Tool/software:

Hi 

I am using this part in my design and for power budgeting i am not getting clarity on current consumption of this device. and how much voltage does this required. and if it is operating on 3.3V  then how it is giving 50V output?

  • 0
    TI__Mastermind 26180 points

    Hi Nitesh,

    This part is essentially a high-current inverting buffer that goes on the low side of a load. So the load is connected to 0-50V on its high side and the ULN collector pin(s) on its low side, then the input pins can be driven with a low voltage such as 3.3V. When the input pins go high, the output pins go low and the load is turned on.

    Thanks,

    Patrick

  • 0
    Prodigy 40 points

    How much current is consumed and at what voltage?

  • 0 in reply to Nitesh Malik
    TI__Mastermind 26180 points

    Hi Nitesh,

    The input pins are mostly resistive so you can reference the Iin spec or calculate via VBE and the internal input resistors when the input is high. When the output is off, there is some small leakage, and when it is on the current through the output is dictated by the high side voltage and load impedance.

    However, since this device has such a simple internal circuitry, there is no device "Iq" aside from what is detailed above.

    Thanks,

    Patrick