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SN74HC4066: What is the difference between SN74HC4066PWR and 74LVC4066PW?

Adam Torma
Mastermind 45380 points
Part Number: SN74HC4066
Other Parts Discussed in Thread: CD74HC4066,

e2e, 

My customer is looking for P2P drop in replacement for 74LVC4066PW and our cross reference device is SN74HC4066PW,

However , from the cross reference code it says these two device are P2P but not exact equivalent, code Q.

 

Can I know what’s the different between these two?  And any concern for customer to B2B replace 74LVC4066PW with our SN74HC4066PW?

 

Per my check , there’s only minor difference between these two device like (operating voltage, turn on time…etc) ,

however , it should be no issue for customer to B2B change 74LVC4066PW with our SN74HC4066PW ,

Kindly let me know if your suggestion , thanks!

Adam 

  • 0
    Guru 271850 points

    The largest difference between the LVC and HC families is switching speed and drive strength, but that does not matter for an analog switch.

    The HC's on-resistance is higher, and its bandwidth is lower. If this is important, consider the CD74HC4066, which has better (but not identical) characteristics.

  • 0
    TI__Mastermind 26868 points

    Hey Adam,

    You're correct in that there are really only minor differences such as the operating voltage, timing characteristics, and the bandwidth. These may be a concern depending on the application. If you gave me more information on the characteristics of the signal being driven and use case I can help further determine whether this can be a drop in replacement. 

    A small concern I do have is the voltage logic levels. The SN74HC4066 isn't fully TTL compatible. Below are the logic levels, the top one in black and white is the SN74HC4066 and bottom in blue being the 74LVC4066

    They are very close so depending on the application the logic may not be an issue at all. 

    However, if these minor differences are an issue, the CD74HCT4066 may be a better fit. It's still P2P to the LVC but the HCT family has modified input circuitry which make the threshold voltage compatible with TTL circuits. Besides that the HCT output and features are similar to that of the HC family. It will have a higher BW and lower Ron than the SN74HC4066.

    Hope this helps,
    Rami