The KTA1140 is a single-chip, highly integrated CMOS solution for Power over Ethernet (PoE) Powered Devices requiring input power of up to class 8 and 90Watts. Applications include Voice over IP (VoIP) Phones, Wireless LAN Access Point, Security Cameras, WiMAX Terminals, Point-of-Sales Terminals, RFID Readers, Thin Clients and Notebook computers.

The KTA1140 implements all of the physical layer Powered Device (PD) functionality, as required by IEEE® 802.3af-2003, IEEE® 802.3at-2009 and IEEE® 802.3bt- 2018 standards. This includes 5-event classification, Type 1-2 or 3-4 PSE detection indicators (PST1/2 and PSDBT), PD detection, under-voltage lockout (UVLO), and Hot-Swap FET integration.

The KTA1140 has been architected to address EM emission concerns in PoE applications. The chip implements many design features that minimize transmission of system common-mode noise onto the Unshielded Twisted Pair (UTP).

The device is designed to provide safe, low-impedance discharge paths directly to the earth ground, resulting in superior reliability and circuit protection.


  • Fully supports IEEE® Std. 802.3bt
  • Supports Input Power Levels Up to 90W
  • Compatible with both IEEE® Std. 802.3af/at
  • Support Class 0-8 for PD
  • Robust Type 1, 2, 3 and 4 PSE detector with proprietary digital filtering line noise
  • Auto-adjust Maintain Power Signature (MPS) for Type 1-4 PSE
  • Supports up to 5 Event Classification
  • Programmable DC current limit up to 2.3A for 90W applications
  • IEC 61000-4-2/3/4/5/6 requirements for EMC Compliance
  • Exceptional EMI performance
  • Low Rds-on 100 V Hot-Swap FET (typical 0.1Ω)
  • Integrated Short-Circuit Protection
  • Over temperature protection
  • Seamless support for local power down to 9.5V
  • Supports Low Power Standby Modes
  • 5×5 mm, 20 lead WQFN Package
  • -40°C to +125°C Junction Temperature Range)


  • Pan, tilt and zoom (PTZ), security and web cameras
  • Voice over IP (VoIP) phones
  • Lighting and High Power Wireless Data Systems
  • Wireless LAN access points, WiMAX terminals
  • Point-of-sale (PoS) terminals, RFID terminals
  • Thin clients and notebook computers
  • Fiber-to-the-home (FTTH) terminals

Packaging Information

Package Dimensions Pins Package Type
WQFN55-20 5.00mm x 5.00mm x 0.65mm 20 UAQ


Vin (min)  Vin (max)  PoE PD Support Control Topology Number of Output Rails High Voltage Isolation
37V 57V 802.3af HW Mode Flyback, Buck 1 External

Technical Documentation

Description Documents Type
Package Outline DrawingWQFN55-20 UAQ PODPDF


Part Number Marking1 Operating Temperature Package
KTA1140EUAQ-TB SQYYZZZZ -40°C to +125°C WQFN55-20

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