# ESD diode current specification

I'm using this ESD diode for an Ethernet application.

The clamping voltages and the working voltage values are satisfied.

But I am not sure about the current values. The minimum peak current is given as 1A. I want to know whether the 1A is really required for ethernet applications? Isn't it too high ?

Can someone tell me what value of current (peak current) of the ESD should be right for ethernet/usb applications?

The minimum peak current is given as 1A. I want to know whether the 1A is really required for ethernet applications? Isn't it too high ?

The peak current of 1 amp is when a surge occurs. For normal standard ethernet operation, nowhere near 1 amp will be flowing.

By the way, I believe you mean 1 amp p-p (as mentioned in the data sheet).

Can someone tell me what value of current (peak current) of the ESD should be right for ethernet/usb applications?

Here is the specification regarding ESD: -

• You need to look into what the equivalent circuit of the ESD generator is in IEC/EN 61000-4-2
• Model it in a simulator (fairly easy actually)
• Model the TVS
• Run a simulation to find the peak positive and peak negative currents

It'll be the same peak current for any low voltage application so, no need to make distinctions between ethernet and USB. EN61000-4-2 ESD generator (from a simple web search): -

Image from here.

So, if the 100 pF capacitor is charged to 30 kV, the maximum current surge will be about 91 amps. But, this will reduce due to cable inductance and capacitance (which you need to model).

• Thank you for the answer @Andyaka. So, the peak current of 1A is during a surge. So, does it mean that we design and select the device only for a surge current of 1A? My confusion is how the peak current of 1A is fixed with respect to the ethernet application?
– user220456
Commented Dec 5, 2022 at 10:51
• No, the peak current may be a lot higher than this; you need to calculate or simulate it. The 1 amp figure is barely of any consequence whatsoever. Maybe you should explain which page of the data sheet you refer to when you say 1 amp so I can double check this. Commented Dec 5, 2022 at 10:53
• I'm referring to the Electrical characteristics table. Over there in the clamping voltage specification, I see the clamping voltage as 5.5V max at 1A of peak pulse current. That's the 1A current that I am referring to. Could you please check and clarify my confusion
– user220456
Commented Dec 5, 2022 at 10:55
• Oh Ok. So, the maximum current depends on the ESD generator, right? Thank you for the clarification. I have accepted the answer
– user220456
Commented Dec 5, 2022 at 11:04
• You can simulate the generator voltage waveform with linear rising and falling waveforms. Commented Dec 5, 2022 at 11:05