7 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

7.1 Application Information

The ESDS304, ESDS302 devices are diode type TVS which is used to provide a path to ground for dissipating

ESD events on high-speed signal lines between a human interface connector and a system. As the current

from ESD passes through the TVS, only a small voltage drop is present across the diode. This is the voltage

presented to the protected IC. The low RDYN of the triggered TVS holds this voltage, VCLAMP, to a safe level for

the protected IC.

7.2 Typical Application

Figure 7-1. ESDS304 Protecting the Ethernet 1G Interface

7.2.1 Design Requirements

A typical operation for the ESDS304 would be protecting a high speed dataline similar to one shown in Figure

7-1. In this example, the ESDS304 is protecting an Ethernet PHY's data lines that has a nominal operating

voltage of 3.6V. Many of the Ethernet interfaces that connect to long cables require protection against ±1kV

surge test through a 42Ω coupling resistor and a 0.5μF capacitor, equaling roughly 24 A of surge current.

Without any input protection, if a surge event is caused by lightning, coupling, ringing, or any other fault

condition, this input voltage will rise to hundreds of volts for multiple microseconds, harming the device. For

Ethernet 1000Base-T (1Gbps), application design parameters listed in Table 7-1 are known.

Table 7-1. Design Parameters

DESIGN PARAMETER

VALUE

Single ended signal voltage range on

differential data line pairs

0 to 3.6V

Operating Frequency

125MHz

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ESDS302, ESDS304

SLVSEG8B – MAY 2018 – REVISED JANUARY 2024

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