6© 2012 Semtech Corporation
www.semtech.com
PRELIMINARY
PROTECTION PRODUCTS
RClamp3374N
Applications Information
Device Connection Options for Protection of Four
High-Speed Data Lines
This device is designed to protect four high-speed data
lines (two line pairs). It has been optimized for use on
Ethernet interfaces where large magnitude lightning
and ESD surges are expected. The RClamp3374N is
constructed using Semtech’s proprietary EPD process
technology. The EPD process provides low stand-off
(turn-on) voltages with significant reductions while
maintaining good clamping characteristics and high
surge capability. They feature a true operating voltage
of 3.3 volts. Each I/O pin pair features a low
capacitance steering diode bridge that is designed to
route harmful surge current into the internal low
voltage TVS diode. Each data pair is rated to
withstand 1000 Watts of surge power (8/20us impulse
waveform). When placed on the PHY side of the
magnetics, it can be used to meet the requirements of
Telcordia GR-1089, K.20, K.21, and other high energy
surge standards.
The RClamp3374N is designed with a flow through pin
configuration for easy layout. In a GbE application, TX+
and TX- lines would enter at pins 1, 2, 4, and 5 and exit
at pins 10, 9, 7, and 6 respectively. The traces should
be unbroken and run under the device as shown. Pins
3 and 8 are electrically connected to the three center
ground tabs. In a typical Ethernet application, these
pins as well as the tabs should be left floating (i.e. not
connected to ground).
Layout Example
Pin Configuration
1
5
GND
GND
GND
10
6
GND
GND
Tx1+ Out
Tx1- Out
Tx2+ Out
Tx2- Out
Tx1+ In
Tx1- In
Tx2+ In
Tx2- In
