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CD4081B: CD4081B

Xabier Zabaleta
Prodigy 10 points
Part Number: CD4081B
Other Parts Discussed in Thread: SN74LVC1G08

Hi:

We have used the CD4081B AND Gate in a design and we have a doubt with the Output High (Source) current.

Every 5 secondos, during 3 milisecons, we need a 4,7mA output high current in a Output. We can see that the output voltage goes down from 5V to 3,5V. It is because the output current in the output is to high and the component can not give the power we need.

For the circuit that we have design, the 5v to 3,5V drop voltage is correct, but we would like to know if these operating mode for the CD4081Bis correct. We would like to know if the CD4081B is working in a degradated mode an we are decreasing the live of the component.

Thank you

  • 0
    TI__Genius 16725 points

    Hi,

    An output current of 4.7mA on one output is not too much since the maximum allowable dc current on one channel is 10mA. And the output voltage dropping from 5V to 3.5V due to this is expected. 

    My only recommendation is to move our new devices for 5V operation. They provide better current drive as well as less power consumption. I would recommend you use a device like the SN74LVC1G08 for this.

    Thanks!

    -Karan