TMUX1072: RUTR

Hello Hussain,

To better help you can you tell me the following 

1.Can you please send over a schematic of your circuit? This will help me no what voltages and currents are going into the pins of the device.

2. Can you tell more about the voltage and how long the esd strike lasts in your setup? 

You might external esd protection if this is a large stray esd votlage that is striking your system.

Please reach back out after you can find the  information and I will be happy to help!

Regards,

Kameron

Hello Kameron ,

1- Input voltage applying of IC is 5V and Current is 20 mA max. on all pins.

2 - The ESD voltage is 800 Volts. and ESD time is 30 Secs  to 1 minute.

Schematic image.

Hello Hussain,

So I am going to send this to our esd team to see if we have a diode that can help protect  your design.

1. To help the esd team, where is the 800V esd striking?( Which pin of the mux)

Regards,

Kameron

Hi Kameron,

Thanks for passing this on!

Hi Hussain,

As Kameron asked, the pin of the mux that is being tested would be very helpful here to ensure I can recommend the best device here!

In addition, is this 800V and 30-60 second time the measured ESD occurring, or is this the testing you are doing on the MUX device?

Best Regards,

Josh Prushing

Hi Josh,

    Thanks for your response.

    We are not giving ESD directly on any pin of MUX device. We are giving ESD on outer body of hardware and outer body is made of stainless steel. When we give ESD on outer body near by mux and other part of body . Mux become damage. and Pin no 7 and 11 are near to body.

Hi Hussain,

Thanks for clarifying here!

Could you please provide the part names of the device you are currently using on pin 7 and 11?

Just to confirm, is the 30-60 second time a constant duration of the ESD you are doing, or are you shocking the MUX in short bursts across the timeframe?

Best Regards,

Josh Prushin

Hi Josh,

            At Pin 11 we connect a nickle part and Pin 7 is open not connected any where. we are giving constantly ESD on SS body at 30-60 seconds time duration.

Best Regards,

Hussain

Hi Hussain,

I would like to understand a little more about the testing scenario here. Is the voltage applied following a certain standard, such as IEC 61000-4-2, or is this a constant AC/DC voltage of 800V? ESD strikes typically only occur over a time frame of ~100-150ns, so I am trying to understand the requirements of the system.

In addition, what does the failure of the IC look like? Is this no data transfer during the ESD strike, after the strike, or does the IC behave differently? Are there certain pins that are failing, or is the device as a whole failing?

I apologize for all of the questions, I just want to be sure I completely understand the situation at hand before recommending a device!

Best Regards,

Josh Prushing

Hi Josh,

            We are not following IEC standard, We are just applying 800V DC transient on Hardware. When we give ESD some times IC stops data transferring, and we reset the power of IC then i will start again and some times IC is damaged , it stop transferring data and load the circuit.    Only Mux IC is failing and other circuit are function properly. 

Best regards,

Hussain Y

Hi McKenzie,

                         We are already connect  5V TVS diodes on pin 7 and pin 11 and input power supply of MUX with respect to ground. We get good result by it . But still some times MUX will damaged. Please help us, how we protect the MUX ic from ESD and surge

Hi Hussian, 

What is the normal voltage running through the ESD diodes and MUX? I was looking at the datasheet for TMUX1072 and it shows the operating voltage to be around 18V. I am worried the diodes you are currently using are turning on when they aren't supposed to which could be causing damage to the device and inconsistent protection. If that is the case, then the working voltage of the diode or the breakdown voltage needs to be higher so the diode won't turn on during normal operation. 

Best,

McKenzie 

Hi McKenzie,

                 The mux is operate on 5V and Tvs diode the 5V and we are applying 800V Dc ESD. After adding TVS diodes on Mux , Now mux is not damages but it is going in hang condition, like its common and NC are open and not giving constant values. on NC pins.

Regards,

Abhijeet