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 ESDS31x devices are a diode type TVS which is used to provide a path to ground for dissipating surge and

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

surge or 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

Ethernet

PHY

TP1+

TP1-

TP2+

TP2-

TP3+

TP3-

TP4+

TP4-

RJ-45

Connector

ESDS314

ESDS314

Figure 7-1. ESDS314 Protecting the Ethernet 1Gbps Interface

7.2.1 Design Requirements

A typical operation for the ESDS314 would be protecting a high speed dataline similar to one shown in Figure

7-1. In this example, the ESDS314 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 24A 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

Signal range on differential data line pairs

0 to 3.6V

Operating frequency

125MHz

www.ti.com

ESDS311, ESDS312, ESDS314

SLVSEG9C – MAY 2018 – REVISED FEBRUARY 2024

Copyright © 2024 Texas Instruments Incorporated

Submit Document Feedback

9

Product Folder Links: ESDS311 ESDS312 ESDS314