ESD204: TVS low surge testing result

Hi Kevin,

Before providing a measurement report, can you please help confirm a couple things from the comments above?

• What is the part number of the downstream IC that is seeing failure?
• What is the Abs Max rating of the pin(s) ESD204 is being placed on?
• When you say downstream IC is failing, how are you able to tell?
• Do you have a detailed image of the test setup?

With this information I can help answer your questions and begin testing.

Best Regards,

Josh Prushing

Hi Josh,

The issue list is derived from the datasheet, is not fail analysis requirements.

Hi Kevin,

Kevin Huang8 said:

After clamping, components behind the ESD204 still fail. The issue can be reproduced using the low-voltage surge test.

Can you please provide the PNs for the components that are failing?

Kevin Huang8 said:

(the requirement is that the low-voltage surge device tested in TI's lab be verified, as the surge test conducted by the third-party lab is IEC 61000-4-5, and the kV level is not discussed)

I'm not sure if this will address this point, but there is a table of expected current values to support various levels of surge testing in IEC 61000-4-5, shown below:

More information can be found here. Typically, for data lines (which I am guessing this device is being placed on because of the channel count and capacitance levels), we use the 42Ω Req.

Kevin Huang8 said:

1. When the TVS operates, I would like to understand the spike voltage changes generated by different low-voltage surge signals (as indicated by the arrows) when the TVS activates. (This phenomenon is not apparent from the clamping voltage presented in the datasheet.)

Clamping voltage is typically derived from ~30ns into a clamping waveform. The initial peak duration is based on the turn-on time of the diode, which in most cases is <5ns or even <1ns in some cases. Although the spike voltage is very high, because it is only present for a very short amount of time, it often does not cause any damage. 

Kevin Huang8 said:

This indicates that leakage current exceeding 5A may occur above 11V.

Kevin Huang8 said:

2. When the TVS is actuated, the voltage behavior (spike peak voltage, clamping voltage) is measured when the leakage current is less than and close to the Ipp current.

3. When the TVS is actuated, the voltage behavior (spike peak voltage, clamping voltage) is measured when the leakage current is greater than and close to the Ipp current.

Kevin Huang8 said:

If the leakage current generated by an 8/20µs surge signal exceeds the Ipp withstand of the ESD204 TVS

I want to clear up information regarding leakage current since there are a couple times this is mentioned through the thread. "Leakage current" is defined as current that is produced as a result of the device being on a line during normal system operation. This current is typically 100nA or lower for TI devices, and is only spec'd up to the working voltage. As you approach the Breakdown voltage, this leakage current approaches 1mA. Then, during a surge strike (or any other transient), the current approaches the IPP of the device, as long as the transient operates within the device's specifications. For ESD204, this maximum current is 5.5A. Is this a suitable current rating for your application?

If you can confirm what circuitry you are trying to protect, I can ensure that ESD204 is a suitable device or if we need to evaluate a different device for your application.

Best Regards,

Josh Prushing

Hi Sir,

The customer would like to use ESD204 in the HDMI, HDBaseT, and USB3.0 interfaces.

May I know if there are any test reports for specific voltages (6V to 20V) for 8/20µs surge condition?