7490220122 PoE+ 4PPoE SMT Transformer 1000BASE-T -40°C To +105°C
The 7490220122 WE-LAN is a rugged, surface-mount LAN transformer engineered for 10/100/1000BASE-T PHY interfaces with support for IEEE 802.3bt 4-pair PoE (4PPoE / PoE+). Designed for industrial and commercial networking equipment, it combines high isolation (1500 Vrms), robust common-mode rejection and industry-grade temperature tolerance (-40 °C to +105 °C), making it ideal for switches, routers, PoE injectors, and embedded Ethernet modules.
7490220122 PoE+ Transformer Key Features:
- Supports 10/100/1000BASE-T (Gigabit Ethernet)
- PoE+ / 4PPoE capable, designed for up to 1000 mA per center tap
- High isolation voltage: 1500 Vrms (Hi-Pot tested)
- 350 µH inductance for strong common-mode noise rejection
- Surface-mount (SMT) package for automated assembly
- Wide operating temperature: -40 °C to +105 °C
- RoHS, REACH, and UL (cURus) compliant
General Specifications of 7490220122 Transformer Modules:
1. Operating Temperature: The transformer has an incredible operating temperature range of -40°C to +105°C. It performs reliably in extreme hot and cold conditions.
2 Hipot Test: Flexibility and quality comply with industry-standard 1500Vrms.
3. Compliance: The Ethernet Transformer is fully compliant with IEEE 802.3bt for 4PPoE. It ensures compatibility with the latest industry standards.
| Item | Description |
|---|---|
| Mounting Type | Surface Mount (SMT) |
| Package Size | 17.55 mm × 14.70 mm |
| Max Height (Seated) | 8.80 mm (0.346") |
| Operating Temperature | -40 °C to +105 °C |
| Storage Conditions | < 40 °C, < 75% RH (original packaging) |
| Moisture Sensitivity Level | MSL 1 |
| Packaging | Tape & Reel |
7490220122 Drawing:
1. Recommended PCB Layout:
2. Schematic Drawing
Power over Ethernet (PoE) Capability
- PoE Standard: IEEE 802.3bt (4PPoE)
- Current Capability: Designed to support applications up to 1000 mA per center tap
- Center Tap Usage: Power delivery via pins 13–24 (refer to official pinout)
This PoE LAN transformer is suitable for PoE switches, injectors, and powered devices (PDs) where stable power delivery and signal integrity are critical.
Electrical Specifications of 7490220122 PoE+ LAN transformer
(Test conditions: +20 °C, 33% RH unless otherwise specified)
| Parameter | Test Conditions | Value | Unit | Notes |
|---|---|---|---|---|
| Data Rate | — | 10/100/1000BASE-T | — | IEEE compliant |
| Turns Ratio | — | 1:1 | ±2% | Primary : Secondary |
| Inductance (OCL) | 100 kHz, 100 mV @ 24 mA | 350 | µH | min. |
| Insertion Loss | 1–100 MHz | ≤ -1.0 | dB | max. |
| Return Loss | 1–30 MHz | ≥ -18 | dB | min. |
| Return Loss | 30–60 MHz | ≥ -14 | dB | min. |
| Return Loss | 60–80 MHz | ≥ -12 | dB | min. |
| Return Loss | 80–100 MHz | ≥ -10 | dB | min. |
| Crosstalk | 1–60 MHz | ≤ -35 | dB | min. |
| Crosstalk | 60–100 MHz | ≤ -30 | dB | min. |
| Differential to CMR | 1–30 MHz | ≤ -40 | dB | min. |
| Differential to CMR | 30–60 MHz | ≤ -35 | dB | min. |
| Differential to CMR | 60–100 MHz | ≤ -30 | dB | min. |
| Isolation Voltage | 1 min | 1500 | Vrms | min. |
Material & Approvals of PoE Transformer:
- The base material is made of durable ferrite material. It provides a solid foundation for seamless data transfer.
- The Cu-Ni-Sn contact plating enhances electrical conductivity and corrosion resistance.
- The wire used is 0UEW/Y 180 for better electrical characteristics. It also ensures efficient signal transmission.
- The case is made of DAP black housing. It meets UL 94V-0 standards for flame resistance and safety assurance.
Compatibility & Design Notes
1. Compatible with mainstream Gigabit PHY chipsets (Broadcom, Marvell, Realtek, Microchip, TI, etc.)
2. Optimized for SMT Ethernet magnetics designs using discrete transformers
3. Recommended to follow standard Ethernet PCB layout guidelines for:
- Differential pair impedance control
- Short center-tap routing for PoE
- Adequate copper width and thermal relief for high current paths
The 7490220122 WE-LAN 1000BASE-T SMT Transformer is a robust and proven solution for Gigabit Ethernet and PoE+ applications.
With its high isolation voltage, excellent EMI performance, PoE current capability, and industrial temperature rating, it is an ideal choice for engineers and sourcing professionals looking for a reliable LAN magnetics component in demanding networking environments.
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