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TS3A24159: Can it be used for 4.75V signal Multiplexing

May
Genius 9880 points
Part Number: TS3A24159
Other Parts Discussed in Thread: TMUX1104, TMUX1574, TMUX1134

Hi,


Customer want to confirm if this device can be used  used in their application. Please see details below.

We are using LED and GSR signals over TS3A24159. The LED current is 4.75V that need to be switched through the TS3A24159. Is it safe limit for TS3A24159? We need 1:2 low voltage mux.

The voltage that is to pass through the mux is 4.75v, to reach the LED that need to be turned to LED and other device.
However if not this IC, than any othe IC that can be used for the purpose? 1:2 mux

Thank you in advance.

Regards,
Maynard

  • 0
    TI__Mastermind 23673 points

    Hey Maynard,

    You seem to have a typo here on the LED current but I'd expect your current levels to be fine given that you're providing power to an LED. If GSR is referring to galvanic skin response then I would also think that is fine too since the impedance of skin is high so I wouldn't expect the current to be so high.

    However, the TS3A24159 is recommended only for voltages up to 3.6V. Take a look at the TS23159 instead which can support up to 5.5V.

    Thanks,
    Rami

  • 0 in reply to Rami Mooti1
    Prodigy 240 points

    Thanks for the response. We are using Osram LEDs for health sensing where 4.75V supply is needed, and to use more LEDs, we are using mux. We are looking for a low resistance, low power consumption, 4 channel Mux. Please suggest.

  • 0 in reply to vivek plawat1
    TI__Mastermind 23673 points

    Hey vivek,

    The original device that was being asked about was a 2channel 2:1(SPDT). Is this the configuration you're looking for, if so, my recommendation above still holds. Although, I'm sorry I seemed to have skipped over part of the part number I was trying to type for the 5.5V device. The TS5A23159 can support the voltage you want and has a low on resistance for your application. The supply current is super low on this device (typ 10nA). 

    If you're looking for a single channel 4:1 multiplexer then the TMUX1104 is the device with the lowest on resistance. 

    If 4 channel meant 4 channel but still keeping the 2:1 configuration, then depending on your supply current constraints either the TMUX1574 or the TMUX1134 will work. TMUX1574 has a higher supply current relative to the TMUX1134 (8nA). 

    Hopefully one of these will address the configuration you're looking for but if you need anything else or i've misinterpreted the configuration you're looking for, let me know and i'll be happy to help! 

    Thanks,
    Rami