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TMUX1109: Question about Latchup

Darren (FAE)
Expert 5483 points
Part Number: TMUX1109

I have a question about the TMUX1109.

If some kind of ESD event triggers the switch into a conducting state, will it stay in that conducting state?

I am referencing this documentation (TI white paper)

"Latch-Up is not a risk if the voltage and current levels applied to the device adhere to the absolute maximum ratings."

In the customer application, the TMUX1109 would be used to source IDAC currents, so even if they latched "ON", the current through each channel would never be more than 1mA or so.

Since this is within the ABS MAX ratings, is it safe to say the device won't "latch-up"? Or if it latches up, the current (1mA) through the ON path is too small to keep the device in a latch-up configuration?

Regards,

Darren

  • 0
    TI__Mastermind 46687 points

    Hi Darren,

    The ESD diodes within the TMUX1109 can withstand ESD strikes - under the rated conditions (shown below) - without latching up. 

    Latch up events should not occur when following recommended operating conditions  - latch up is usually caused by a fault condition on the line. The TMUX1109 does have ESD diodes so faults due to ESD strikes are covered up to the ESD ratings we have in the datasheet. 

    If you have any more questions please let me know!

    Best,

    Parker Dodson