750871110

Switching Converter, SMPS Transformers Overview

The Würth Elektronik part number 750871110 is an offline flyback transformer designed for AC/DC switching mode power supplies. It belongs to the WE-UNIT MID-OLSTM series and features a primary voltage range of 120 to 385V DC. The component provides 4000Vrms isolation and includes an auxiliary winding rated at 10V at 10mA. It has an inductance of 1.6mH measured at 10kHz. The physical dimensions are 21.00mm in length, 25.00mm in width, and a maximum installation height of 16.13mm. It supports a working temperature range from -40°C to +125°C.

Switching Converter, SMPS Transformers Feature Summary

• Designed specifically for offline switch-mode power supply applications using STMicroelectronics VIPer28 integrated circuits.
• Provides high-voltage isolation capability with a rating of 4000Vrms between primary and secondary sides.
• Includes an auxiliary winding to support control circuitry requirements within the converter topology.

Switching Converter, SMPS Transformers Applications

• Offline AC/DC converters
• Switch-mode power supplies (SMPS)
• Flyback converter topologies

Switching Converter, SMPS Transformers Procurement Notes

Verify that the target design utilizes the STMicroelectronics VIPer28 chipset, as this transformer is engineered for specific compatibility with that controller. Confirm that the required isolation voltage meets or exceeds 4000Vrms for the safety standards of the end application. Ensure the PCB layout accommodates the through-hole package dimensions of 21.00mm by 25.00mm with a maximum height of 16.13mm. Check that the operating environment stays within the specified -40°C to +125°C temperature range.

Switching Converter, SMPS Transformers Selection Notes

Select this component when designing an offline flyback converter based on the VIPer28 architecture. It is suitable for applications requiring robust isolation and a wide input voltage range of 120 to 385V DC. Consider the auxiliary winding output if the control IC requires a dedicated bias supply derived from the transformer. Evaluate the thermal performance to ensure the 125°C maximum rating is not exceeded under full load conditions.

Switching Converter, SMPS Transformers Part Context

This transformer is part of the WE-UNIT MID-OLSTM series from Würth Elektronik. This line focuses on offline transformers optimized for specific integrated circuits to simplify power supply design. The 750871110 variant is tailored for the VIPer28 family, ensuring magnetic parameters align with the controller's operational characteristics for efficient energy transfer.

Switching Converter, SMPS Transformers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Direct replacement should only be considered if the alternative component matches the VIPer28 chipset requirements, 1.6mH inductance, 4000Vrms isolation, and identical physical footprint.