749118105

Overview

The Würth Elektronik 749118105 is a WE-UNIT Offline Transformer designed for AC/DC converter applications. It features a 132 kHz operating frequency and a 18.9:1 turns ratio. The component provides 6 mm minimum clearance and creepage distance, ensuring safety compliance. It supports an input voltage range of 120 to 385 V and offers 4000 Vrms isolation. The unit utilizes through-hole mounting with dimensions of 16.8 mm length, 11 mm width, and 16.8 mm height.

Feature Summary

• Designed for tiny switch ICs in power integration applications
• Provides high isolation voltage for safety-critical circuits
• Optimized for 132 kHz switching frequencies

Applications

• AC/DC converters
• LED drivers
• Switch Mode Power Supplies (SMPS)

Procurement Notes

Verify the specific datasheet version and mechanical drawings before integration. Confirm that the 6 mm clearance and creepage distances meet the insulation requirements of your target application's safety standards. Ensure the through-hole footprint matches the PCB layout specifications provided in the official documentation.

Selection Notes

Select this transformer when designing offline power supplies requiring high isolation and compact form factors. It is suitable for designs utilizing On Semiconductor NCP101x or NCP105x controller families. Consider the 4000 Vrms isolation rating for applications demanding robust electrical separation between primary and secondary sides.

Part Context

This component belongs to the WE-UNIT series from Würth Elektronik, which focuses on integrated magnetic solutions for power conversion. The series emphasizes miniaturization and performance for modern switching regulators. The 749118105 specifically targets offline flyback topologies common in consumer and industrial electronics.

Replacement Considerations

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