HM78D-128330MLFTR

Overview

The HM78D-128330MLFTR is a shielded surface-mount coupled inductor array manufactured by TT Electronics/BI Magnetics. It features two coils with a parallel inductance of 33 µH and a series inductance of 132 µH, both at ±20% tolerance. The component has a DC resistance (DCR) of 36 mΩ in parallel configuration and operates within a temperature range of -40°C to +125°C. Its physical dimensions are 12.50 mm x 12.50 mm x 8.05 mm.

Feature Summary

• Dual-coil architecture providing flexible series or parallel connection options
• Shielded construction to minimize electromagnetic interference
• Surface-mount design for automated PCB assembly

Applications

• Power supply filtering circuits
• Signal processing stages requiring coupled inductance
• Embedded system power management modules

Procurement Notes

Verify the specific manufacturer part number against official TT Electronics documentation before procurement. Confirm that the required inductance values and current ratings align with the circuit design specifications. Check for availability status as distribution channels may vary. Ensure compliance with RoHS directives if applicable to the target market.

Selection Notes

Select this component when a compact, shielded dual-inductor solution is required for space-constrained designs. Evaluate the thermal performance at the intended operating current to ensure stability within the specified temperature range. Compare the series and parallel inductance characteristics against the application's electrical requirements to determine the optimal connection mode.

Part Context

This component belongs to the HM78D series of surface-mount coupled inductors from TT Electronics/BI Magnetics. The series is designed for applications requiring high-performance magnetic components in a small footprint. The HM78D models typically offer shielded structures to reduce noise coupling in dense electronic assemblies.

Replacement Considerations

The SRF1280-680M by Bourns Inc. is listed as a direct substitute. Verify electrical compatibility, including inductance, DCR, and saturation current, before substitution. Ensure the physical package dimensions and pinout match the existing PCB layout constraints.