HM42-40004LFTR

Overview

The HM42-40004LFTR is a pulse transformer from the HM42 series manufactured by TT Electronics/BI Magnetics. It features a turns ratio of 2:1:1 and an inductance of 1.2 mH. The component has an ET value of 40.4 Vµs and is designed for gate drive applications. It utilizes a surface mount installation type with dimensions of 0.390" length, 0.319" width, and 0.217" maximum height. The operating temperature range is -40°C to +85°C.

Feature Summary

• Designed specifically for gate drive signal transmission
• Provides electrical isolation with a 2:1:1 turns ratio
• Surface mount construction for automated assembly

Applications

• Gate drive circuits for power semiconductors
• Signal isolation in switching power supplies
• Pulse transformer applications requiring high voltage isolation

Procurement Notes

Verify the specific inductance value (1.2 mH) against design requirements, as datasheets may vary. Confirm the operating temperature limit (+85°C) fits the thermal profile. Check for lead-free compliance if required. Ensure the surface mount footprint matches the PCB layout. Contact the manufacturer for current availability status.

Selection Notes

Select this component when a 2:1:1 isolation ratio is needed for gate driving. The 1.2 mH inductance supports specific pulse widths. Consider the +85°C temperature rating for environmental constraints. The surface mount package simplifies placement. Verify the ET value meets the driver circuit requirements.

Part Context

This part belongs to the HM42 series of toroid style gate drive transformers. The series offers various inductance values and ratios. The HM42-40004LFTR specifically provides 1.2 mH inductance. It is intended for robust industrial and commercial power electronics applications.

Replacement Considerations

HM42-10002LFTR is a direct substitute within the same series. It shares similar physical dimensions and mounting style. Verify that its 300 µH inductance meets the application's pulse requirements.