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ESD204: Suitable for ESD and surge protection on analog signals ?

Victor Tolosana
Prodigy 180 points
Part Number: ESD204
Other Parts Discussed in Thread: ADS114S08, , TPD1E10B06, TPD2E2U06

Hello,

My objective is to protect my ADC's input pins against surge and ESD (±30 kV).

I will use an ADS114S08 to get several potentiometer differential readings, using the integrated current sources (IDAC). 

Would it be advisable to use one channel of the ESD204 for each analog input of this ADC ?

Is there a better way to protect the inputs ?

Thank you. Have a nice day.

  • 0
    TI__Genius 10006 points

    Hi Victor,

    I would not recommend ESD204. It has a Vrwm of 3.6 V, which means after the voltage on the line it's protecting reaches 3.6 V, the diode will start conducting and start leaking more current. I would recommend TPD1E10B06 for each input line. It has a Vrwm of 5.5 V which works with the ADS114S08 's max input voltage of 5.25 V. It does have a higher capacitance than ESD204, but the ADS114S08 seems to be a fairly low speed device so it should be fine. 

    You could also use TPD2E2U06. It is a two channel device, so it would reduce your device count. However, it is only rated for 25 kV.

    Let me know if either of these devices work for you. If so, please click the "Resolved" button.

    Regards,

    Matt Smith