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Product Detailed Parameters
- Description：XFMR POE DC/DC CONV 127UH SMD
- Series：WE-PoE
- Mfr：Würth Elektronik
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：For DC/DC Converters
- Applications：Power Over Ethernet (PoE)
- Intended Chipset：LM5070, LM5071, LM5072, LTC4267, TPS23750, TPS23770
- Chipset Manufacturer：-
- Voltage - Primary：34 ~ 72V
- Voltage - Auxiliary：12V @ 15mA
- Voltage - Isolation：1500Vrms
- Inductance @ Frequency：127µH @ 100kHz
- Frequency：-
- Operating Temperature：-40°C ~ 125°C
- Mounting Type：Surface Mount
- Size / Dimension：0.530" L x 0.591" W (13.46mm x 15.00mm)
- Height - Seated (Max)：0.500" (12.70mm)
- Footprint：0.530" L x 0.713" W (13.46mm x 18.10mm)
- Style：-
- Grade：-
- Qualification：-
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Overview
The Würth Elektronik 7491199212 is a Power over Ethernet (PoE) transformer designed for board mounting. It belongs to the WE-PoE series and utilizes an ER13 core size. The component features a primary inductance of 127µH and a primary DC resistance of 450mΩ. It provides 1500Vrms isolation voltage and operates within a temperature range of -40°C to +125°C. This surface-mount device is intended for use with specific PoE controller chipsets.
Feature Summary
- Designed specifically for Power over Ethernet applications
- Provides high isolation voltage for safety compliance
- Optimized for integration with standard PoE controllers
Applications
- Power over Ethernet (PoE) systems
- DC/DC converter circuits
- Switching Mode Power Supply (SMPS) transformers
Procurement Notes
Verify the exact datasheet version, as product improvements may alter specifications. Confirm that the surface-mount package dimensions match your PCB footprint requirements. Ensure compatibility with the target PoE controller chipset before finalizing the design. Check for any recent production changes or obsolescence notices from the manufacturer.
Selection Notes
Select this component when a dedicated PoE transformer is required for board-level integration. It is suitable for designs utilizing controllers such as LM5070, LM5071, LTC4267, and TPS23750. Consider the 127µH inductance value and 450mΩ resistance for circuit efficiency calculations. The wide operating temperature range supports demanding industrial environments.
Part Context
This part is part of the WE-PoE series by Würth Elektronik, focusing on simple, efficient, and EMI-compliant power delivery solutions. The series offers various configurations for different PoE standards and controller integrations. The 7491199212 specifically targets applications requiring robust isolation and compact surface-mount packaging for modern network equipment.
Replacement Considerations
Public confirmed substitute part numbers are not available in the provided documentation. Verify functional equivalence with other WE-PoE series components if direct substitution is necessary.
