28474C Equivalent & Substitute Parts

Part Overview

The 28474C is a 470 µH unshielded wirewound inductor manufactured by Murata Power Solutions Inc., rated for 780 mA continuous current with a maximum DC resistance of 816mOhm. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and procurement continuity. The part operates across the industrial temperature range of -40°C to 125°C and is designed for surface mount applications in nonstandard packaging.

Substiute Parts

28474C

Murata Power Solutions Inc.In Stock: 78928474C Datasheet

Current PartRFQ

SDR1806-471KL

Bourns Inc.In Stock: 2128SDR1806-471KL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 28474C is determined by strict equivalence across the following electrical and mechanical parameters:

Inductance value must match at 470 µH. Current rating of the substitute must meet or exceed the 780 mA requirement of the original part. DC resistance must not exceed 816mOhm to maintain circuit performance characteristics. Shielding configuration must remain unshielded to preserve electromagnetic behavior in the target application. Operating temperature range must span -40°C to 125°C minimum. Mounting type must be surface mount. Physical dimensions and height must be compatible with the existing PCB layout and assembly process.

The SDR1806-471KL from Bourns Inc. satisfies these substitution criteria through matching inductance, exceeding current rating specifications, maintaining DC resistance within acceptable limits, preserving unshielded configuration, and supporting the required temperature range.

Parameter Comparison

Engineering Selection Recommendations

The SDR1806-471KL serves as a direct substitute for the obsolete 28474C based on electrical parameter equivalence and active product status. The Bourns component provides a 20 mA increase in current rating margin, supporting enhanced thermal headroom in the application circuit. DC resistance remains within 4mOhm of the original specification, preserving power dissipation characteristics. Physical dimensions are compatible with existing PCB layouts, with the substitute measuring slightly smaller in length, width, and height. The SDR1806-471KL carries ROHS3 compliance certification, meeting modern regulatory requirements for new designs and procurement cycles.

Frequently Asked Questions (FAQ)

Q: Can the SDR1806-471KL replace the 28474C in existing designs? A: Yes. Both components share identical inductance values, unshielded configuration, surface mount packaging, and operating temperature range. The substitute provides equivalent electrical performance with a 20 mA current rating advantage.

Q: What is the impact of the 4mOhm difference in DC resistance? A: The SDR1806-471KL DC resistance of 820mOhm versus the 28474C specification of 816mOhm represents a 0.49% increase. This minimal variance maintains circuit performance within standard engineering tolerances for inductor applications.

Q: Are there physical compatibility concerns with PCB layout? A: The SDR1806-471KL dimensions are slightly smaller than the 28474C across all axes. Existing PCB footprints designed for the 28474C will accommodate the substitute without modification. Verify clearance for the 6.90mm seated height versus the original 7.60mm specification.

Q: Does the substitute meet current regulatory standards? A: The SDR1806-471KL is ROHS3 compliant and carries active product status from Bourns Inc., ensuring long-term availability and compliance with modern procurement requirements.

Q: How do the Q factor and self-resonant frequency differences affect circuit behavior? A: The 28474C exhibits higher Q (31.7 @ 800kHz) and self-resonant frequency (4.3MHz) compared to the SDR1806-471KL (15 @ 796kHz and 3MHz respectively). These differences reflect core material and construction variations between manufacturers. Verify application frequency response requirements to confirm suitability for your specific circuit topology.