HM78D-1210560MLFTR

Overview

The HM78D-1210560MLFTR is a shielded surface mount coupled inductor array manufactured by TT Electronics/BI Magnetics. It features two coils with a parallel inductance of 56 µH and a series inductance of 224 µH, both having a tolerance of ±20%. The component supports a maximum DC current of 4.9 A and has a maximum DC resistance of 81 mOhms. Its physical dimensions are 12.5 mm in length and width, with a height of 8.05 mm. It operates within a temperature range of -40°C to +125°C.

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

• Multi-phase DC-DC converter output filtering
• Power supply input/output stages requiring coupled inductance
• High-density power electronics modules

Procurement Notes

Verify the specific suffix and tape/reel packaging configuration against the manufacturer's latest datasheet before ordering. Confirm that the 12.5x12.5mm footprint matches the target PCB layout. Ensure thermal management strategies account for the specified maximum DC current rating under operating conditions.

Selection Notes

Select this component when dual independent or coupled inductors are required in a single compact package. Compare the 56 µH parallel value against circuit requirements. Evaluate the 81 mOhms DCR for efficiency losses. Consider the 125°C temperature rating for high-heat environments compared to standard 85°C alternatives.

Part Context

This part belongs to the HM78D series of surface mount coupled inductors from TT Electronics/BI Magnetics. The series offers various inductance values and current ratings in standardized footprints. The HM78D-1210560MLFTR specifically utilizes the larger 12.5mm square footprint to accommodate higher current capabilities while maintaining magnetic coupling between the two internal coils.

Replacement Considerations

• SRF1280-680M

FAQ

What is the difference between the parallel and series inductance values?

The parallel inductance is 56 µH, representing the effective inductance when coils are connected in parallel. The series inductance is 224 µH, representing the effective inductance when coils are connected in series.

Is the HM78D-1210560MLFTR shielded?

Yes, the component is a shielded inductor array designed to contain magnetic flux and reduce electromagnetic interference.