TPD4E1B06: Part rating for pulses shorter than 8/20us

Hi Andrew,

Could you please clarify a specific pulse measurement you are desiring? If you are referring to 10/1000uS, the 8/20uS specifications should be a greater peak power and current.

Best Regards,

Josh Prushing

Hi Josh:

One specific case I am looking at is ESD with a 150ns discharge pulse width and a peak current of 45A.

What I would like is a plot of peak power vs. pulse width, common in TVS datasheets as per example below.

Regards

Andrew Eftychiou

Hi Andrew,

If you look at the surge response graph for our devices, you can calculate Ipp by multiplying Vclamp and Ipp. This should give you the information you are looking for. In addition, I would like to note that TPD4E01B06 is not a TVS diode. If you are looking for a TVS diode with above 45A Ipp, you can search on our Product Selection Tool to find the right device for your needs.

Please let me know if you have any additional questions!

Best Regards,

Josh Prushing

Josh:

It's not specified as a TVS in the datasheet heading but it is in the description.

3 Description
The TPD4E1B06 is a 4-channel bi-directional 1• Ultra Low Leakage Current 0.5 nA (Max)
Transient Protection for 4 I/O Lines Transient Voltage Suppressor (TVS) diode array.

My question remains the same. 

Is this part rated for higher pulses, Ipp and Ppp, for pulse durations shorter than the 8/20us, like all other TVSs?

Regards

Andrew Eftychiou

Hi Andrew,

Unfortunately, we do not have the testing data to confirm or deny this. In order to know for sure, you will need to conduct your own ESD testing to verify the capabilities of this device.

Please let me know if there are any additional questions!

Best Regards,

Josh Prushing

Josh:

The datasheet states

1. Features
• Ultra Low Leakage Current 0.5 nA (Max)
• Transient Protection for 4 I/O Lines  
– IEC 61000-4-2 Contact Discharge ±12 KV (peak current is 12KV/330=26A) 
– IEC 61000-4-2 Air-Gap Discharge ±15 KV (peak current is 15KV/330=45A)

Text in blue is mine.

Based on the above the peak current is much higher than the 3.0A specified in 7.1 Absolute Maximum Ratings. Pulse duration is of course much shorter than 8/20us.

This is a clear contradiction within the datasheet that needs to be corrected.

Either this TVS is compliant to the above standard or the absolute maximum surge current is 3.0A, both cannot be true.

Regards

Andrew Eftychiou

Hi Andrew,

This equation is incorrect; there is no direct correlation between IEC 61000-4-2 rating and Ipp value. IEC 61000-4-2 and IEC 61000-4-5 are two different waveforms with different shapes and durations. Please see the following app brief for more information: IEC 61000-4-x Tests for TI’s Protection Devices.

Please let me know if you have additional questions.

Best Regards,

Josh Prushing

Josh:

What equation are you referring to? 

I am already familiar with the app brief you mentioned and the brief does show a peak current of 30A for contact discharge at 8KV. See Figure 1 of the brief. There is an implicit correlation between IEC 61000-4 and the peak current but it also depends on the impedance of the circuit on which the discharge is applied. When a TVS is used this impedance is relatively low and can be ignored in most cases without much effect on the peak surge current.

My questions remain unanswered.

Regards 

Andrew Eftychiou 

Hi Andrew,

I understand that you are trying to determine whether TPD4E1B06 can withstand a 150ns pulse with a 45A Ipp rating. Ultimately, we only test our device according to the IEC 61000-4-2/IEC 61000-4-5 ratings, so we do not have the data to support or refute this use case. The best way to verify this case is to test this device in your system. If you would like to request samples for this device, please visit this link and scroll to the bottom of the page: TPD4E1B06 data sheet, product information and support | TI.com. 

Best Regards,

Josh Prushing

Josh:

It comes down to these two points.

1. The ambiguity in the datasheet must be clarified

2. The datasheet must contain the standard TVS curve for Ipp/Ppp vs. pulse duration

Regards

Andrew Eftychiou

Hi Andrew,

Apologies for the confusion, I will attempt to clarify here and add both of these changes to our collateral update page.

Typically, internally we use the term 'TVS' to denote surge diodes. TVS diodes by definition are any diode that can clamp a transient voltage. Again, apologies for the confusion on this.

As for the TVS curve, we currently do not have the data for this, but I will look into obtaining this data and uploading to the datasheet.

Best Regards,

Josh Prushing

Hi Andrew,

After speaking with my team, we have determined that we do not have the capabilities to add the Ipp/Ppp vs pulse duration graph. I will be unable to add this to the datasheet.

As for the "TVS" vs "ESD" terminology used in the datasheet, I can add this to my list of collateral updates, but it will be a few weeks before this change is implemented. I will reply back to this thread once it is complete, but for now I will leave the thread closed.

Have a good day,

Josh Prushing 

Josh:

This is is not an acceptable response. TI has an obligation to clarify any inconsistencies in the datasheet of this part.

Regards

Andrew Eftychiou

Hi Andrew,

I have put in a request to modify the datasheet, but I have not yet been given access to make the change, so it will take some time to implement. There are a few different teams involved with making a change in a datasheet, and it often takes a few days after I am given access for the change to go live. I will let you know as soon as the change has been made. I apologize for any inconvenience.

Best Regards,

Josh Prushing

Thanks Josh.