Class 3 15W Power over Ethernet (PoE) Powered Devices

Si3402 and Si3404 PoE Powered Devices are the most highly-integrated, IEEE 802.3at Type 1-compliant, PoE PD interface and pulse-width-modulated (PWM) switching regulator devices in the industry. Si3402 and Si3404 products set a new bar for device integration, lowest overall BOM cost, efficiency and reliability and enable quick addition of PoE functionality to Ethernet applications. When included in the design of a PoE-enabled system, such as a wireless access point or VoIP phone, Si3402 and Si3404 devices convert the high voltage (typically ±48 V) supplied over Ethernet copper UTP cabling into a regulated, low-voltage dc supply. Si3402 and Si3404 devices combine all the required IEEE 802.3 at Type 1 detection, classification and hot swap interfaces with a complete, high efficiency, PWM switching regulator.

Si3402-B is a pin-compatible replacement for the end-of-life Si3402-A. Existing customer products based on Si3402-A EVB reference designs can be readily re-used with minimal change to a few on-board components. Si3402 is a strong legacy device with long-term support, is available in a 5mm x 5mm QFN package and includes input diode bridges on chip. The newer Si3404 offers additional features in a compact 4mm x 4mm QFN package and does not include input diode bridges on-chip.

Package size
4x4 mm
Integrated dc dc converter

Class 3 15W Powered Devices Common Specs

  • Supports non-isolated and isolated switching topologies
  • Fully integrated high-voltage devices
  • Two complete diode bridges (Si3402)
  • Transient voltage suppressor
  • Switching regulator driver FET
  • Dual current-limited hot swap switch
  • Tunable switching frequency (Si3404)
  • Comprehensive protection circuitry
  • Transient over-voltage protection
  • Under voltage lockout
  • Thermal shutdown protection
  • Fold back current limiting
  • Low-EMI slew rate control
  • Transformer bias winding support (Si3404)

Jump Start Your PoE Powered Device Development

PoE Powered Device (PD) design involves achieving IEEE compatibility and creating an efficient, stable, and EMI compliant power supply. Our complete portfolio of evaluation boards (EVBs) offer complete PD designs ready to be incorporated into an end system. All of our PoE PD EVBs are EMI compliant and include an IEEE compatibility report, detailed power supply performance analysis, and schematics in the user's guide.

Class 2, 3 EVBs

Class 4 EVBs

Class 8 EVBs

Find the Right Class 3 15W Device Select Columns
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Part Number Description IEEE Specification Maximum Output Power (W) Package Type Package Size (mm) Auto MPS Support Aux Adapter Support Transformer Bias Winding Input DC DC Efficiency (%) Sleep Mode Switching Frequency Range (kHz) Synchronous FET Driver Temperature Range (ºC)
IEEE 802.3af Type 1 PD interface with dc-dc converter 802.3at Type 1 15 QFN20 5x5 78 350 350 -40 85
IEEE 802.3af Type 1 PD interface with high efficiency dc-dc converter and compact footprint 802.3at Type 1 15 QFN20 4x4 80 100 500 -40 85
IEEE 802.3at Type 2 PD interface with dc-dc converter 802.3 at Type 2 15 QFN20 5x5 83 Basic 100 500 -40 85
IEEE 802.3at Type 2 PD interface with high-efficiency dc-dc converter and sleep, wake, and LED drive 802.3 at Type 2 15 QFN24 5x5 85 Advanced 100 500 -40 85

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