TVS3300: Performance of TVS3300 in negative conducted transients per ISO7637-2

Hi Kartik,

It looks like we don't have data on the TVS330x performance for ISO7637-2 because these devices are not automotive qualified. We only specify the clamping performance during negative transients for IEC 61000-4-5 (for TVS3300, this is "Forward Clamp Voltage", for TVS3301, this is "Clamp Voltage" when presented with -Ipp). 

I'm not quite sure what you mean by V_DS, can you please elaborate on what this rating measures?

Best Regards,

Josh Prushing           

Hello Josh,

Thank you for your response.

As I noticed MOSFETs are used in the device (as per the block diagram), I was hoping to understand it in more detail—specifically, I am looking for the Vds rating of the MOSFETs used if you can share.

Additionally, do we have the Power Derating and Pulse Rating Curve vs Temperature graphs available for TVS3301 / TVS300?

Lastly, could you please let me know if we have any automotive-qualified TVS devices with similar specifications?

Hi Kartik,

Thanks for the clarification on V_DS, I will check with our team to see if we have this information on hand. 

It does not look like we have a Power Derating curve available, but for the Pulse Rating vs Temperature curve we have a graph that I think you may be able to calculate what you need. Please see the below:

With this graph, we have taken voltage sweeps at 35A (Max IPP) of TVS3300 across temperature, and the power can be calculated from the Voltage and Current shown.

Currently, we do not have any automotive-qualified TVS Flat Clamp devices. If you can provide some specification requirements, I can let you know if we have any automotive-qualified options to provide.

Best Regards,

Josh Prushing

Hello Josh, thank you for your response.

could you please help me understand whether it's possible to connect multiple unidirectional or bidirectional clamping devices in series to achieve a specific clamping voltage? For instance, in my case, I’m aiming for a clamp around +200V & -40V

Would this approach be feasible, or are there limitations I should be aware of?

Hi Kartik,

You can add devices in series to sum the following parameters:

• Working Voltage
• Breakdown Voltage
• Clamping Voltage
• Capacitance
• Leakage Current

As you stack multiple devices in series, your capacitance and leakage current will be very high, especially if you stack 5 devices together! Maybe for the application this is not a concern, but this is important to keep in mind.

Another limitation is the Surge rating and the ESD rating of the devices (IEC 61000-4-2/5 standard ratings). These values will be limited by the minimum protection value provided by a singular device in the chain. This really only matters if you are stacking different devices, as if you are stacking multiple of the same device, the effective ESD/Surge ratings will be the same no matter how many of that device you stack.

Stacking 5x TVS3300 would provide the following specifications:

This seems to work well for your positive clamping target, but not the negative clamping target. Are you ok with a lower negative clamping voltage?

 Best Regards,

Josh Prushing