WA8704-ALD 1500Vrms PoE Signal Path Transformer (150W, IEEE 802.3bt, Gigabit)

For hardware engineers integrating the WA8704-ALD into PCB layouts:

1. Thermal Management: Be advised that applying 1.5 A DC current to each cable-side center tap will result in an approximate 15°C temperature rise (from a 25°C ambient). Ensure adequate copper pouring and thermal vias in your PCB design to dissipate heat, especially if operating near the 85°C upper limit.
2. Reflow Soldering: The highly durable terminations can withstand a maximum of three 40-second reflow cycles at +260°C. Parts must be allowed to cool completely to room temperature between cycles to prevent internal stress.
3. Packaging for SMT: Parts are supplied in Tape and Reel format (250 parts per 13-inch reel). The plastic tape is 32.4 mm wide with a 24 mm pocket spacing, optimized for high-speed automated pick-and-place machines.

Product Overview

The WA8704-ALD is a premium, high-performance PoE (Power over Ethernet) Signal Path Transformer. Specifically engineered to meet and exceed the rigorous demands of the IEEE 802.3bt high-power PoE standard, this surface-mount (SMD) transformer is designed for next-generation Gigabit Ethernet (Gbit) applications.

Capable of handling a massive 150 W 4-pair signal path with 1.5 A on each center tap, the WA8704-ALD delivers unprecedented power delivery without compromising signal integrity. It significantly exceeds the return loss requirements for Gigabit Ethernet, ensuring pristine data transmission alongside high-wattage power. With an industrial operating temperature range of –40°C to +85°C and a robust 1500 Vrms isolation, this transformer is the definitive choice for engineers designing high-power PoE switches, advanced PTZ cameras, 5G small cells, and PoE smart lighting networks.

Key Features

1. Next-Generation Power Handling (IEEE 802.3bt)

Designed for the most demanding PoE++ applications, the WA8704-ALD supports a 150W 4-pair power architecture. It handles 1.5 A DC current per cable-side center tap with exceptional thermal efficiency (causing only a 15°C temperature rise from a 25°C ambient baseline).

2. Flawless Gigabit Signal Integrity

Power delivery should not come at the cost of data speed. This transformer is meticulously wound on a high-grade ferrite core to exceed standard Gigabit Ethernet return loss requirements, minimizing crosstalk and maximizing Differential to Common Mode Rejection.

3. High-Reliability Isolation & Construction

Safety and durability are paramount in B2B hardware. The WA8704-ALD provides 1500 Vrms winding-to-winding isolation (for one minute). Furthermore, it boasts an MSL 1 (Moisture Sensitivity Level) rating, meaning it has an unlimited floor life (<30°C / 85% RH) and requires no baking prior to reflow soldering.

Technical Specifications

1. Electrical & Performance Parameters

2. Mechanical & Material Specifications

3. Environmental & Soldering Ratings

WA8704-ALD PoE Transformer Datasheet

Target Applications

The WA8704-ALD is an essential passive component for Power Sourcing Equipment (PSE) and Powered Devices (PD) requiring IEEE 802.3bt compliance:

• Networking Infrastructure: High-power PoE++ switches, midspans, and injectors.
• Telecommunications: 5G small cells and outdoor Wi-Fi 6/6E access points.
• Smart Building & Security: Pan-Tilt-Zoom (PTZ) IP cameras, smart LED lighting systems (PoE lighting), and access control panels.
• Industrial IoT: Industrial computers and remote sensor hubs requiring single-cable power and high-speed data.

Frequently Asked Questions

Q: What is the maximum power handling of the WA8704-ALD transformer?

A: The WA8704-ALD is designed to handle a 150 W 4-pair signal path, with up to 1.5 A of DC current on each center tap, making it fully suitable for IEEE 802.3bt PoE++ applications.

Q: Does this transformer support Gigabit Ethernet speeds?

A: Yes, it is specifically designed for Gigabit Ethernet (Gbit) and exceeds standard return loss requirements to guarantee excellent signal integrity.

Q: What is the isolation voltage (Hi-pot) rating?

A: The transformer features a robust isolation voltage of 1500 Vrms for one minute (winding to winding).

Q: Is the WA8704-ALD sensitive to moisture during PCB assembly?

A: No, it has a Moisture Sensitivity Level (MSL) of 1, meaning it has an unlimited floor life at standard conditions (<30°C / 85% RH) and does not require pre-baking before reflow soldering.

Q: What are the exact dimensions of this component?

A: The maximum dimensions are 16.50 mm (Length) x 18.60 mm (Width) x 10.16 mm (Height). It utilizes a 24-pad surface mount (SMD) footprint.