Si3471 Data Sheet Autonomous Single Ethernet Port IEEE 802.3bt PoE PSE Device KEY FEATURES The Si3471 is a fully autonomous Power over Ethernet (PoE) Power Sourcing Equip- ment (PSE) device. It is fully IEEE 802.3bt compliant and compatible with IEEE 802.3af Single Ethernet port PoE Power Sourcing and 802.3at. It is optimized for use in PSE mid-spans and injectors that do not re- Equipment (PSE) device quire a host or MCU. The Si3471 integrates one Ethernet port with the IEEE-required IEEE 802.3bt compliant powered device (PD) detection and classification functionality. In addition, it features IEEE 802.3af and 802.3at compatible powered device (PD) disconnect using dc sense algorithms and a robust multipoint de- Multi-point detection tection algorithm. Intelligent protection circuitry includes input undervoltage detection, Comprehensive fault protection circuitry output current limit, and short-circuit protection. The Si3471 works autonomously and includes: does not require a host or MCU to program it. The Si3471 is programmed for maximum Power undervoltage lockout available power by pulling its configration pins high or low. Output current limit and short-circuit Applications protection Thermal overload detection IEEE 802.3af, 802.3at, and 802.3bt Power Sourcing Equipment (PSE) Operating temp range: 40 C to +85 C Power over Ethernet Injectors 38-pin 5 x 7 mm QFN package (RoHS- Single Port Mid-Spans compliant) Power over Ethernet Switches IP Phone Systems Smartgrid Switches Ruggedized and Industrial Switches Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 1 Rev. 1.0 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice December 22, 2021 1Si3471 Data Sheet Ordering Guide 1. Ordering Guide Table 1.1. Si3471 Ordering Guide Ordering Product Revision Package Temperature Range (Ambient) 1 Part Number 38-pin, 5 x 7 mm QFN Si3471A-A02-IM A02 40 to 85 C 2 RoHS-compliant Note: 1. Add an R to the end of the part number for tape and reel option (e.g., Si3471A-A01-IM or Si3471A-A01-IMR). 2. Pin 1 is oriented in Quadrant 1 in the tape: 1 2 3 4 Quadrant Designations Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 2 Rev. 1.0 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice December 22, 2021 2