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TMUX4827: switching life time related info

Jimmy WANG
Genius 4085 points
Part Number: TMUX4827

Hi team,

The customer asked if there is a limit on the number of operations. Usually, As I know mus use MOSFET as a switch. Is it true?

If not do you have switching lifetime-related info?

As I know If do not use it over the specifications, there will be no limit on the number of times. thanks 

  • 0
    Guru 317060 points

    You are correct. MOSFETs do not degrade when switching (compare with the MOSFETs used inside CPUs, which continuously switch at MHz or GHz frequencies).

    As long as you stay below the absolute maximum ratings, the electrical characteristics are guaranteed.

  • 0 in reply to Clemens Ladisch
    Genius 4085 points

    Hi Team,

    The customer has another question below.

    Assume that the input terminal has 5V and 1V exists at the output terminal, resulting in a voltage difference between both ends.
    Will turning on MUX at this time cause damage to the IC?
    The customer is simulating an abnormal situation. thanks 

  • 0 in reply to Jimmy WANG
    Guru 317060 points

    A closed switch behaves like a 0.12 Ω resistor. So a current will flow. (5 V − 1 V) / 0.12 Ω = 33.0 A, which exceeds the absolute maximum ratings, so you will need protection against that (voltage clamping, or a current-limiting series resistor).