SRF1280A-3R3Y

Overview

The Bourns SRF1280A-3R3Y is a dual-winding shielded power inductor array designed for surface-mount applications. It features two coils with an inductance of 3.3 µH and a tolerance of ±30%. In parallel configuration, it offers a maximum DC resistance of 11 mΩ, a rated current of 10.4 A, and a saturation current of 21.5 A. In series configuration, the inductance is 13.2 µH, with a maximum DC resistance of 40 mΩ, a rated current of 5.23 A, and a saturation current of 10.8 A. The component operates within a temperature range of -40°C to +125°C.

Feature Summary

• Dual-coil architecture enabling flexible series or parallel circuit integration
• Magnetically shielded design to minimize electromagnetic interference radiation
• High current handling capabilities suitable for demanding power stages
• Automotive-grade reliability certified under AEC-Q200 standards

Applications

• Automotive DC-to-DC converter modules
• Multi-phase power distribution networks
• On-board charging systems
• Advanced driver assistance system (ADAS) power supplies

Procurement Notes

Verify the specific ordering suffix against the manufacturer's datasheet to ensure correct packaging and tape specifications. Confirm that the selected variant meets the required AEC-Q200 qualification level for automotive deployment. Cross-reference the pinout and electrical parameters with the latest revision of the official specification document before finalizing procurement orders.

Selection Notes

Select this component when high current density and low magnetic leakage are critical requirements. The dual-winding structure allows designers to optimize footprint efficiency by choosing between series or parallel configurations based on voltage and current needs. Ensure the operating environment remains within the specified -40°C to +125°C temperature range for reliable performance.

Part Context

This part belongs to the SRF1280A series of dual-winding shielded power inductors from Bourns Inc. The series is engineered for high-current applications, offering various inductance values while maintaining a compact surface-mount footprint. It is distinct from single-coil variants and other series like SRR5228A due to its coupled winding design and higher current ratings.

Replacement Considerations

Direct substitutes include other SRF1280A series parts with different inductance values, such as SRF1280A-1R0Y or SRF1280A-4R7Y, provided the electrical parameters match the circuit requirements. Verify mechanical dimensions and terminal compatibility before substitution.

FAQ

What is the difference in electrical characteristics between series and parallel connections?

In parallel, the inductance is 3.3 µH with a rated current of 10.4 A and DCR of 11 mΩ. In series, the inductance increases to 13.2 µH, the rated current drops to 5.23 A, and the DCR rises to 40 mΩ.

Is this component qualified for automotive applications?

Yes, the SRF1280A series is qualified to the AEC-Q200 standard, making it suitable for automotive electronic systems.