7491194912

Overview

The Würth Elektronik 7491194912 is a Power over Ethernet Plus (PoE+) transformer designed for board mounting. It features a single primary and single secondary winding configuration with a turns ratio of 3:1:1. The component supports an input voltage range of 36 V to 72 V and provides a 12 V secondary output capable of delivering up to 2.5 A. Key electrical parameters include an inductance of 42 µH and a DC resistance of 0.061 ohms. It offers 1500 Vrms isolation and operates within a temperature range of -40°C to 125°C.

Feature Summary

• Supports IEEE 802.3at PoE+ power delivery standards
• Integrated EMI filtering capabilities compliant with Red Expert simulation
• High thermal stability suitable for demanding environments

Applications

• Power over Ethernet (PoE) powered devices
• DC/DC converter circuits for network infrastructure
• Industrial Ethernet communication systems

Procurement Notes

Verify the specific datasheet revision and RoHS compliance status prior to procurement, as manufacturing updates may occur. Confirm that the surface mount footprint dimensions align with the target PCB layout. Ensure the selected component meets the required isolation voltage ratings for the specific application safety standards. Cross-reference the manufacturer's latest documentation to confirm availability and lead times through authorized distributors.

Selection Notes

Select this component when designing systems requiring integrated PoE+ power extraction and signal coupling. The 3:1:1 turns ratio is optimized for standard PoE+ voltage levels. Consider the 125°C operating temperature limit for high-heat applications. The compact EFD20 size facilitates dense PCB layouts. Verify compatibility with the intended controller ICs regarding magnetic specifications.

Part Context

This part belongs to the Würth Elektronik WE-PoE+ series, which specializes in combined power and data transformers for Ethernet applications. The series is engineered to simplify design by integrating magnetics and filtering. The 7491194912 specifically targets PoE+ implementations, providing a solution that reduces component count and board space compared to discrete designs.

Replacement Considerations

Consult official Wurth Elektronik substitution guides for verified alternatives. Generic replacements may not match the specific 3:1:1 ratio or EMI performance characteristics required for PoE+ compliance.