Transformator

POE025-PD13050S

POE025-PD13050S - 25W PoE PD Transformer, 5V Out | Bourns

The Bourns POE025-PD13050S is a 25 W Power over Ethernet (PoE) powered-device (PD) flyback transformer for DC/DC converters, delivering a 5 V isolated output in a compact EPD13 surface-mount package with 10 gull-wing terminals, 1500 Vrms isolation, and a 200 kHz switching-frequency rating. A PoE transformer is the magnetic energy-storage element at the heart of an isolated flyback converter used in powered devices such as IP cameras and wireless access points. It provides galvanic isolation between the IEEE 802.3at/af powered-device interface and the low-voltage logic rails, while its turns ratios set the conversion ratio from the PoE input range down to the system supply. Within the power-conversion hierarchy, it sits in the magnetic components family alongside SMPS transformers and inductors, and is a direct companion to PoE PD controller ICs and PWM controllers. Key features of this part include a 25 W power throughput suitable for PoE Class 4 (30 W-class, IEEE 802.3at) designs, a 6:1 / 2.57:1 / 6:1 multi-winding turns-ratio set per distributor datasheet listings, and 1500 Vrms (1500 VAC) isolation between primary and secondary windings. The surface-mount gull-wing terminal construction supports automated assembly and reflow soldering. The EPD13 core geometry gives a compact footprint for space-constrained PD interfaces while providing adequate winding window for the 25 W flyback power level at 200 kHz operation. Per the Bourns POE-EP & POE-PD series datasheet, the POE025-PD13050S is rated for an operating temperature range of -40 C to +125 C, and the series is RoHS compliant per Directive 2015/863. Multi-tap secondary windings allow flexible output regulation with feedback via optocoupler and a TL431-type shunt regulator. Typical applications include VoIP phones, WLAN access points, security IP cameras, and other IEEE 802.3 PoE powered devices that need an isolated 5 V rail. The transformer pairs naturally with Bourns-recommended PD controller and MOSFET solutions in reference flyback topologies. When designing with this transformer, verify that the switching controller frequency matches the 200 kHz transformer rating and that clamp/snubber networks are fitted on the primary leakage inductance to protect the main switch. Keep creepage and clearance distances intact on the PCB to preserve the 1500 Vrms isolation barrier. This page synthesizes distributor pricing from LCSC and DigiKey, the Bourns POE-EP/POE-PD series datasheet, drop-in same-family alternatives, and practical flyback design notes not found in the manufacturer datasheet alone.