749119933

Overview

The Würth Elektronik 749119933 is a Power over Ethernet (PoE) transformer designed for DC/DC converters and SMPS applications. It features a primary voltage rating of 36 to 57V, an isolation voltage of 1500Vrms, and operates within a frequency range of 200 to 500kHz. The component has an inductance of 127µH at 100kHz and utilizes a surface mount package measuring 13.46mm x 18.10mm with a maximum height of 12.70mm. It supports a working temperature range from -40°C to +125°C.

Feature Summary

• Provides high-voltage isolation suitable for PoE power transfer
• Optimized for switching mode power supply topologies
• Designed for surface mount assembly processes

Applications

• Power over Ethernet (PoE) systems
• DC/DC converter circuits
• Switching Mode Power Supply (SMPS) designs

Procurement Notes

Verify the specific manufacturer part number against official Wurth Elektronik documentation to ensure compatibility with target circuit requirements. Confirm that the surface mount footprint dimensions align with PCB layout constraints. Check for any recent Product Change Notifications or datasheet corrections that may affect electrical characteristics or mechanical specifications before finalizing procurement decisions.

Selection Notes

Select this component when designing PoE interfaces requiring robust isolation and operation within standard switching frequencies. Ensure the input voltage range matches the system's 36-57V requirement. Verify thermal management capabilities given the wide operating temperature range. Consider compatible controller chipsets such as LM5070 or TPS23750 series for integration.

Part Context

This component belongs to the WE-PoE series by Würth Elektronik, specialized for Power over Ethernet applications. It serves as a critical interface between the network line and the power conversion stage, enabling simultaneous data and power transmission over Ethernet cabling while maintaining electrical safety through galvanic isolation.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.