IEEE802.3at PoE silicon - AS1135

The AS1135 is a single-chip, highly integrated CMOS solution for Power over Ethernet (PoE) Powered Devices requiring input power of up to 30Watts. 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 AS1135 integrates input Surge Protection, a PD controller, and a low-emission DC-DC controller. The AS1135 implements all the physical layer Powered Device (PD) functionality as required by the IEEE® 802.3af-2005 and IEEE® 802.3at (Draft 3.0) standards. This includes 2-event classification, Type2 PSE detection indicator (ATDET) in addition to PD detection, under-voltage lockout, and hot-swap FET integration.

The AS1135 has been architected and designed to address both EMI emission concerns and surge/over-voltage protection in POE applications. The AS1135 implements many design features that minimizes transmission of system common-mode noise on to the UTP. On-chip integration of surge protection provides faster ressponse to surge events and limits stray surge current from passing through sensitive circuits, such as the Ethernet PHY device. The device is designed to provide a safe low impedance discharge paths directly back to the earth ground, resulting in superior reliability and circuit protection.


  • Pan, Tilt and Zoom (PTZ), Security and Web Cameras
  • Voice over IP (VoIP) phones
  • Wireless LAN Access Points, WiMax Terminals
  • Point of Sale (PoS)Terminals, RFID Terminals
  • Thin Clients and Notebook Computers
  • Fiber to the Home (FTTH) Terminals


The AS1135 is fully integrated and architected at a system level to provide the following features:

  • Fully supports IEEE® Std. 802.3af-2005 and supports IEEE® Std. 802.3at (Draft 3.0) power requirements
  • Supports 2-Event Physical Layer Classification for 802.3at (Draft 3.0) higher power PD applications
  • Provides Type 2 PSE detection per 802.3at (Draft 3.0)
  • Meets IEC 61000-4-2/3/4/5/6 for EMC Compliance
  • Meets IEC 60950 isolation requirements
  • Integrated DC-DC controller, provides exceptional EMI performance
  • Programmable DC current limit up to 800mA
  • Provides seamless support for local power 10~57V
  • Low Rds-on hot-swap FET (typical 0.8Ω)
  • Over temperature protection
  • Industrial temperature range, -40ºC to +85ºC
  • 5x5 mm, 20 lead QFN Package, RoHS compliant