Circuit Protection for 10/100BASE-T Ethernet

10BASE-T and 100BASE-T(X) are the most commonly used Standards for Ethernet over twisted pair cabling, supporting both full-duplex and half-duplex transmission. They run at 10Mb/s and 100Mb/s respectively, and use standard 8-pin modular connectors known as RJ45. These two Standards only use two pairs out of the four available.

Interface Standard High Speed Pairs Max Data Rate (Mb/s) Differential Impedance Max Capacitance (pF)
10/100BASE-T 2 ≤100 100 Ω 16.0 to 200.0
1000BASE-T, 1000BASE-TX, Gigabit 4 ≤1000 100 Ω 3.0

White connector White connector White connectors


Typical Application

The 10/100 Base-T Ethernet interface is susceptible to ESD strikes, cable-discharge events and lightning-induced transients governed by IEC 61000-4-5, GR-1089-CORE and other Standards.

Secondary & Tertiary Protection Used

Secondary & 
Tertiary Protection Used

TSPD Features
TVS Features



1-Pair 2-Pairs
TVS - 1-pair schematic TVS - 1-pair schematic

Max line transient
Surge IPP, 8/20us
Line-Line Capacitance [pF]
ESD Rating under IEC 61000-4-2 (Contact) Package
NUP4114H 5.0 5.0 12* 0.4 ±13 kV TSOP-6
SRDA3.3 3.3 5.0 25 4.0 ±8 kV SOIC-8
SRDA05 5.0 7.0 23 5.0 ±8 kV SOIC-8
ESD1014 3.3 5.0 25 1.5 ±30 kV UDFN10
LC03-6R2 6.7 7.0 100 8.0 ±30 kV SOIC-8
*On Pin 5


TSPD schematic TSPD schematic

C0 [pF] IDRM [mA] IH [mA] IT [A] Surge IPP, 10/1000ms [A] package
NP0080TA Series 8-16 9.5-18 N/A 11-13 N/A 50.0 N/A 50 [8/20ms] TSOP-5

Your request has been submitted for approval.
Please allow 2-5 business days for a response.
You will receive an email when your request is approved.
Request for this document already exists and is waiting for approval.