Features

• Enables system designers to comply with:
 CISPR22 and FCC Part 15, Class B
requirements for Radiated and Conducted
Emissions
 IEC 61000-4-3 requirements for Radiated and
Conducted Immunity, Level 3 or higher
 IEC 61000-4-2 ESD (Air Discharge) of ±25kV
 IEC 61000-4-2 ESD (Contact Discharge) of
±12kV
 Cable Discharge Event (CDE) of ±12kV
• Provides up to 10dB of additional common
mode noise suppression over the frequency of
1MHz to 125MHz when used with Ethernet
magnetics
• Robust built-in ESD suppressors protect the
Ethernet PHY and improve system ESD
performance
• JESD22-A114, ESD, HBM of ±8kV
• Interfaces to standard Ethernet transformers
and 10/100/1000 Ethernet PHYs
• Uses a single standard power rail (3.3V or 2.5V)
• Open drain output stage that can be biased
from 1.8V to 3.3V using transformer center-tap
supply as needed based on choice of Ethernet
PHY.
• Flow-through routing for ease of board layout
• Typical power consumption of 90mW.
• Low power mode available
• Industrial temperature range (-40°C to +85°C)

Applications

• Ethernet systems requiring additional CM
suppression to meet EMC Class B emissions or
higher EMI immunity requirements and ESD
protection
• PoE and Non-PoE Ethernet systems
• VoIP Phones, IP Cameras, WAPs, Routers,
Switches
• Set Top Boxes, Networked Printers and
Appliances, Desktop and Laptop Computers

Brief Description

The KTA1550 is a single-chip, highly integrated CMOS
solution for Common Mode (CM) noise suppression &
transient voltage protection in Ethernet applications.
The KTA1550 EMI/ESD Suppressor has been architected
and designed to provide system level ESD protection and
EMI suppression in Ethernet products, enabling an easier
path to system EMC compliance.
The KTA1550 utilizes Kinetic Technologies’ patented
Active Choke technology which offers superior Common
Mode reduction and immunity compared to passive filtering
techniques in Ethernet applications. The adaptive and
continuous suppression operates over the entire Ethernet
signal bandwidth, and it compensates for many variables
that are the source of common mode noise in Ethernet
systems. It also improves the differential-to-common mode
balance of the system. This enables system designers to
meet EMI emissions and EMI immunity requirements from
the start of the design.
In addition, the KTA1550 includes highly robust ESD/Surge
protection diodes to protect the Ethernet PHY from various
transient overvoltage events. These are built using
Kinetics' proprietary design and layout techniques to safely
deal with very high current densities in a CMOS process
without creating voltage and/or thermal overstress that
causes damage to the device.
Each KTA1550 supports two twisted pair interfaces.
10/100 applications require one KTA1550 device while
10/100/1000 applications require two KTA1550 devices.
The KTA1550 is available in a small footprint 16-pin QSOP
or 16-pin TDFN 4mm x 2.5mm Reduction of Hazardous
Substance (RoHS) compliant package.