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CD74HCT4066-Q1: Minimum Required Input Voltage for "High"

Part Number: CD74HCT4066-Q1
Other Parts Discussed in Thread: CD74HCT4066, , TMUX1511

The CD74HCT4066 datasheet states the VIH (input voltage required for "high" detection) to be MIN 3.15V for VCC = 4.5V. 

But the CD74HCT4066-Q1 datasheet states for VCC between 4.5V ~ 5.5V, VIH is 2V minimum.

I just want to double check and make sure the 2V minimum is accurate.

If you know any other P2P 14-pin TSSOP 4-channel SPST switches with 5V for VCC and VIH <=2V MIN, I would appreciate getting pointed in the right direction.

Regards,

Darren

  • The CD74HCT4066 datasheet states on p. 4 that VIH is 2 V. (This document is for both HC and HCT devices.)

  • Hi Darren,

    As Clemens mentioned, the VIH threshold for the HCT types is in a different table (on page 4), confirming 2V VIH is correct for CD74HCT4066.

    It sounds like you are looking for a switch with 1.8V logic compatibility, I recommend TMUX1511, a 14-pin TSSOP 4-channel SPST with 1.8V logic levels, however the pinout is not identical to CD74HCT4066.

    Best regards,
    Kate