SRF1280A-821M

Overview

The Bourns SRF1280A-821M is a dual-winding shielded power inductor array designed for surface-mount applications. It features a ferrite core and wirewound construction within a 12.5 mm x 12.5 mm x 8.0 mm package. The component provides an inductance of 820 µH with ±20% tolerance. Electrical characteristics include a DC resistance of 1.632 Ohms, a parallel current rating of 650 mA, and a series current rating of 325 mA. Saturation currents are specified at 1.27 A (parallel) and 0.633 A (series). It operates reliably between -40°C and +125°C.

Feature Summary

• Dual-winding configuration allows flexible circuit integration via series or parallel connections.
• Shielded magnetic design minimizes electromagnetic interference and external field coupling.
• High-current capability supports demanding power conversion requirements.
• Automotive-grade qualification ensures reliability in harsh operating environments.

Applications

• Automotive power distribution systems
• DC/DC converter output filtering
• Point-of-load regulation circuits

Procurement Notes

Verify the specific suffix 'M' indicates the required ±20% tolerance. Confirm package dimensions match the PCB footprint. Ensure thermal management aligns with the rated current limits. Check RoHS compliance status for regulatory adherence. Validate supplier authenticity to prevent counterfeit components.

Selection Notes

Select this component when high inductance density is required in a compact form factor. Consider the dual-winding topology for interleaved or coupled applications. Evaluate saturation current margins against peak load conditions. Compare DCR values for efficiency optimization in low-voltage designs.

Part Context

This part belongs to the SRF1280A series of dual-winding shielded power inductors from Bourns. The series is engineered for automotive and industrial power electronics. It shares physical dimensions with other variants but differs in electrical specifications such as inductance and current ratings.

Replacement Considerations

Direct substitutes include the DRQ127-821-R from Eaton, which offers similar inductance and package size. Verify pinout compatibility and electrical parameters before substitution. Cross-reference datasheets for thermal and mechanical constraints.