POE025-PD13050S - 25W PoE PD Transformer, 5V Out | Bourns
MPN: POE025-PD13050S ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.2 | $2.20 |
| 10 | $2.05 | $20.50 |
| 100 | $1.85 | $185.00 |
| 500 | $1.7 | $850.00 |
| 1,000 | $1.55 | $1,550.00 |
POE025-PD13050S Overview
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.
Drop-in alternatives for POE025-PD13050S — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
POE025-PD13120S
✅ Drop-In📋 Reference alternative (not in catalog)
POE030-PD13050S
✅ Drop-In📋 Reference alternative (not in catalog)
POE012-PD13050S
✅ Drop-In📋 Reference alternative (not in catalog)
POE012-PD13120S
✅ Drop-In📋 Reference alternative (not in catalog)
POE025-EP13050S
✅ Drop-In📋 Reference alternative (not in catalog)
POE025-PD13050S Specifications
| Product Type | PoE DC/DC Converter Flyback Transformer (PoE-PD) |
| Power Rating | 25 W |
| Output Voltage | 5 V |
| Turns Ratio | 6:1 / 2.57:1 / 6:1 |
| Isolation Voltage | 1500 Vrms (1500 VAC) |
| Switching Frequency | 200 kHz |
| Package | EPD13, 10-terminal gull wing SMD |
| Mounting Type | Surface Mount |
| Terminal Finish / Termination | Gull wing, 10 terminals |
| Operating Temperature | -40C to +125C |
| Series Operating Temperature Range (Series) | -40C to +165C (series max; this part -40C to +125C) |
| Application | Power over Ethernet (PoE) for DC/DC converters |
| RoHS Status | Compliant (Directive 2015/863) |
POE025-PD13050S epd13, 10-terminal gull wing smd Pin Configuration Guide
Pin configuration for POE025-PD13050S (epd13, 10-terminal gull wing smd package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for POE025-PD13050S.
Refer to the datasheet for full pin configuration.
Typical Applications
POE025-PD13050S is suitable for 6 applications: VoIP Phones, WLAN Access Points, Security IP Cameras, Isolated Auxiliary Power Supplies, Industrial Network Nodes, Smart Building and IoT Gateways.
VoIP Phones
VoIP handsets are classic IEEE 802.3af/at powered devices: the Ethernet cable delivers nominal 48 V power to the PD interface, and an isolated flyback converter built around the POE025-PD13050S steps it down to a 5 V rail that feeds internal point-of-load regulators for the DSP, PHY, and audio codec. The transformer's 1500 Vrms isolation protects user-accessible handset connectors and keeps the phone's chassis safe per PoE safety requirements, while its 25 W rating covers voice plus display and camera accessories. With a 200 kHz rated switching frequency and EPD13 gull-wing SMD construction, the design stays compact enough for a handset base. A TL431-plus-optocoupler feedback loop across the 5 V output provides tight regulation at light standby load, important for idle-line power compliance.
Recommended
WLAN Access Points
Enterprise WLAN access points commonly draw power over Ethernet (802.3at) and require a clean isolated 5 V rail for radios, MCU, and Ethernet PHY circuitry. The POE025-PD13050S fits this role with its 25 W rating covering dual-band 802.11ac/ax radio power draw, and its 200 kHz flyback rating keeps converter magnetics and filter capacitors small inside access-point enclosures. The 6:1 / 2.57:1 / 6:1 multi-winding arrangement supports the main 5 V output plus auxiliary bias windings for the PD controller and fan-less thermal design. The EPD13 surface-mount package with gull-wing terminals suits the automated assembly typical of high-volume AP manufacturing, and -40 C to +125 C operation covers ceiling-mounted and outdoor-enclosure deployments with wide ambient swings.
Recommended
Security IP Cameras
Outdoor and dome IP cameras are PoE-powered devices whose image sensors, IR LED illuminators, pan-tilt motors, and SoCs all hang off an isolated low-voltage rail, making a 25 W margin valuable. The POE025-PD13050S provides that 5 V isolated output with 1500 Vrms isolation between the Ethernet-powered primary and the camera's user-accessible video and I/O circuitry. The flyback topology inherent to this transformer gives simple single-switch conversion at 200 kHz, and its multi-winding secondary can supply a separate rail for IR LED drivers. Rated -40 C to +125 C, it survives enclosure solar heating and cold-weather installs. Surface-mount EPD13 construction and gull-wing terminals keep assembly cost low for the high camera volumes typical of security projects.
Recommended
Isolated Auxiliary Power Supplies
Beyond PoE-specific gear, the POE025-PD13050S serves general-purpose isolated flyback supplies needing a 5 V output at up to 25 W with 1500 Vrms isolation, such as building-control nodes, HVAC controllers, and industrial sensor interfaces powered from 48 V nominal buses. Because the transformer is specified for 200 kHz switching, designers can use widely available low-cost PWM controllers rather than specialized PoE silicon, provided the input voltage range overlaps the winding design point. The -40 C to +125 C rating covers unconditioned industrial environments, and the RoHS-compliant EPD13 gull-wing package meets European-market environmental requirements. Estimated: at 25 W and a typical 85% flyback efficiency, input power is roughly 29 W, so a controller rated above that with margin should be selected.
Recommended
Industrial Network Nodes
Factory automation nodes, PLC remote I/O, and industrial Ethernet endpoints increasingly use PoE for combined power and data. The POE025-PD13050S gives these nodes an isolated 5 V, 25 W front-end: the flyback primary connects to the PoE PD bridge rectifier output, while the isolated 5 V secondary feeds downstream bucks for 3.3 V and 1.8 V logic. The -40 C to +125 C operating range aligns with industrial cabinet temperatures, and 1500 Vrms isolation supports the galvanic separation required between network cabling and grounded machine chassis. The EPD13 surface-mount transformer withstands reflow profiles used in conformal-coated industrial boards. Per the Bourns series datasheet, the PD-family parts in this class are specified exactly for PoE DC/DC converter service at these power levels.
Recommended
Smart Building and IoT Gateways
PoE-powered smart building gateways, lighting controllers, and IoT hubs consolidate power delivery over structured cabling, and the POE025-PD13050S provides their isolated 5 V core rail within a 25 W envelope adequate for SoC, radio, and peripheral loads. The transformer's 200 kHz rating supports compact flyback designs that fit gateway enclosures without forced airflow, and 1500 Vrms isolation separates the Ethernet plant from low-voltage sensor buses such as RS-485, DALI, or 1-Wire. Multi-winding secondaries allow an auxiliary bias rail for the PD controller and a keep-alive supply for wake-on-network logic. Gull-wing SMD terminals on the EPD13 core allow standard SMT assembly, and RoHS compliance per Directive 2015/863 keeps the finished gateway compliant for global distribution.
Recommended
Recommended Products Summary
Engineering reference data for POE025-PD13050S — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | POE025-PD13120S | POE030-PD13050S | POE012-PD13050S | POE025-EP13050S |
|---|---|---|---|---|---|
| Package | EPD13 SMD, 10-terminal gull wing | EPD13 SMD - same family | EPD13 SMD - same family | EPD13 SMD - same family | EP13 SMD - related geometry |
| Brand | Bourns | Bourns | Bourns | Bourns | Bourns |
| Power Rating | 25 W | 25 W | 30 W | 12 W | 25 W |
| Output Voltage Design | 5 V | 12 V | 5 V | 5 V | 5 V |
| Isolation Voltage | 1500 Vrms | 1500 Vrms (series) | 1500 Vrms (series) | 1500 Vrms (series) | 1500 Vrms (series) |
| Switching Frequency | 200 kHz | 200 kHz (series) | 200 kHz (series) | 200 kHz (series) | 200 kHz (series) |
| RoHS Compliance | Compliant (Dir. 2015/863) | Compliant (series) | Compliant (series) | Compliant (series) | Compliant (series) |
| Typical Application | PoE PD, 25W 5V rail | PoE PD, 25W 12V rail | PoE PD, 30W 5V rail | PoE PD, 12W 5V rail | PoE, 25W 5V (EP geometry) |
Key Differentiators
- Higher power headroom within the same PD13 footprint (vs POE012-PD13050S)
- Extended temperature rating within the same power class (vs POE025-PD13120S)
- Space-efficient PD13 geometry vs EP-series equivalent (vs POE025-EP13050S)
Design Notes
Design the flyback primary clamp before anything else: leakage inductance energy in a 25 W, 200 kHz flyback creates a voltage spike on the main switch at every turn-off. Use an RCD clamp or TVS-based clamp on the primary winding and verify the switch drain rating covers reflected output voltage plus the PoE bus (up to 57 V for 802.3at). Select a PWM controller whose operating frequency matches the transformer's 200 kHz rating, since running far above the rated frequency increases core loss and winding AC resistance.
Maintain the isolation barrier on the PCB: keep a visible creepage/clearance slot under the transformer between the primary (PoE) side and secondary (5 V) side, and never route secondary traces under the transformer body or primary decoupling. Place the PD controller, bridge rectifier, and bulk capacitance tightly at the primary pins to minimize the hot loop, and position the TL431/optocoupler feedback path away from the primary switching node to avoid coupling noise into the regulation loop.
Estimated: at 25 W output and an assumed 85-88% flyback efficiency, internal loss is roughly 3-4 W, most of it in the transformer windings and core. The EPD13 package dissipates this through its gull-wing terminals and the body, so provide generous copper pours on all winding termination pads and use thermal vias where possible. Verify winding temperature rise against the -40 C to +125 C rating in your worst-case load and ambient; if rise is excessive, POE030-PD13050S offers 20% more power headroom in the same family.
Do not substitute this transformer into a 12 V-output design - use POE025-PD13120S instead; the winding configuration is fixed per MPN. Confirm the exact turns-ratio termination against the datasheet winding schematic before layout, since PoE transformers have multi-tap secondaries where a swapped tap produces an unregulated output. Also note the series datasheet lists different temperature ranges per suffix (this part: +125 C max; others to +165 C) - never assume the series maximum applies.
Compliance Information
RoHS compliant per Bourns series datasheet (Directive 2015/863, Mar 31, 2015). TTI listing confirms hazardous substance content within limits of EU Directive 2011/65/EC and amendments. Datasheet carries California Prop 65 warning notice (www.P65Warnings.ca.gov). REACH, halogen-free, and conflict-minerals status not stated in provided data.
