SRF1280-221M

Overview

The Bourns SRF1280-221M is a dual-winding shielded power inductor array from the SRF1280 series. It features two coils with a nominal inductance of 220 µH and a tolerance of ±20%. The component has a maximum DC resistance of 343 mΩ in parallel configuration and 1.38 Ω in series. Rated currents are 1.29 A (parallel) and 645 mA (series). Dimensions are 12.50 mm x 12.50 mm x 8.00 mm. Operating temperature range is -40°C to 125°C.

Feature Summary

• Dual-winding coupled inductor design for space-constrained applications
• Shielded magnetic structure to minimize electromagnetic interference
• Surface mount construction for automated assembly processes

Applications

• DC-DC converter output filtering
• Power supply input stages
• Signal processing circuits requiring coupled inductance

Procurement Notes

Verify the specific suffix 'M' indicates ±20% tolerance against the manufacturer's current datasheet. Confirm RoHS compliance status as regulatory requirements evolve. Ensure the ordering quantity matches the required reel size or cut tape availability for production needs.

Selection Notes

Select this part when dual isolated windings or coupled operation is required within a single footprint. Compare saturation currents and DCR values against circuit load requirements. Consider the 1280 package dimensions for PCB real estate constraints relative to alternative single-coil inductors.

Part Context

This component belongs to the SRF1280 series of surface mount power inductors manufactured by Bourns Inc. The series utilizes ferrite core materials and offers various inductance values. The SRF1280-221M specifically provides a 220 µH rating suitable for general-purpose power management applications.

Replacement Considerations

Check for direct cross-references from other manufacturers offering identical 12.5x12.5mm dual-windings. Verify pin compatibility and electrical equivalence before substitution.