28473C Fixed Inductor - Equivalent & Substitute Parts

Part Overview

The 28473C is a 47 µH unshielded wirewound inductor manufactured by Murata Power Solutions Inc., rated for 2.66 A with a maximum DC resistance of 86 mOhm. 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

28473C

Murata Power Solutions Inc.In Stock: 92928473C Datasheet

Current PartRFQ

SDR1806-470ML

Bourns Inc.In Stock: 5160SDR1806-470ML Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 28473C is determined by the following critical parameters:

• Inductance Value: 47 µH (exact match required)
• Current Rating: Minimum 2.5 A (substitute must support the application current demand)
• DC Resistance: Maximum 95 mOhm (acceptable variance within thermal and efficiency constraints)
• Operating Temperature Range: -40°C ~ 125°C (must match or exceed)
• Mounting Type: Surface Mount (physical compatibility)
• Shielding Configuration: Unshielded (electromagnetic environment compatibility)

The SDR1806-470ML from Bourns Inc. meets these substitution criteria. Both components share identical inductance values, compatible current ratings, overlapping temperature ranges, and surface mount configurations. The SDR1806-470ML operates at active product status with RoHS3 compliance, providing long-term availability advantages over the obsolete 28473C.

Parameter Comparison

Engineering Selection Recommendations

The SDR1806-470ML is qualified as a direct substitute for the 28473C based on the following factors:

• Product Status: The SDR1806-470ML maintains active product status with established supply chain availability, addressing the obsolescence of the 28473C.
• Compliance: The SDR1806-470ML is RoHS3 compliant, meeting current regulatory requirements. Both components are REACH unaffected and classified as EAR99 for export control purposes.
• Electrical Compatibility: Both inductors share the 47 µH inductance specification and identical operating temperature range. The SDR1806-470ML current rating of 2.5 A is within acceptable tolerance of the 28473C specification of 2.66 A for most applications. The DCR variance of 9 mOhm (95 mOhm vs. 86 mOhm) represents a 10.5% increase and must be evaluated against thermal dissipation requirements in the target circuit.
• Physical Compatibility: Both components are surface mount, nonstandard package inductors with comparable footprint dimensions (18.50mm × 15.20mm vs. 18.30mm × 14.00mm) and heights (7.60mm vs. 6.90mm).

Frequently Asked Questions (FAQ)

Q: Can the SDR1806-470ML directly replace the 28473C without circuit modifications?

A: The SDR1806-470ML meets the core electrical specifications for substitution. However, the 160 mA reduction in current rating (2.5 A vs. 2.66 A) and 9 mOhm increase in DC resistance require verification that the application circuit operates within these revised parameters. Thermal analysis of the increased DCR dissipation is recommended.

Q: What is the significance of the different core materials?

A: The 28473C uses a standard wirewound core, while the SDR1806-470ML employs a ferrite drum core wirewound construction. Both configurations deliver the specified 47 µH inductance and unshielded operation. The ferrite core design in the SDR1806-470ML provides the stated saturation current of 4.6 A.

Q: Are there packaging differences that affect assembly?

A: The 28473C is supplied in nonstandard packaging, while the SDR1806-470ML is available in Tape & Reel (TR) format. Physical dimensions are comparable (length and width within 0.2% tolerance, height difference of 0.7mm). PCB footprint compatibility should be confirmed during design validation.

Q: Why is the self-resonant frequency different between the two parts?

A: The self-resonant frequency difference (10.4 MHz vs. 9 MHz) reflects the different core construction and winding geometry. Both frequencies are sufficiently high for typical inductor applications in the 1-2.52 MHz operating range. Circuit performance at frequencies approaching these limits requires specific evaluation.

Q: What compliance advantages does the SDR1806-470ML offer?

A: The SDR1806-470ML is RoHS3 compliant and maintains active product status, ensuring long-term availability and regulatory alignment. The 28473C, as an obsolete component, presents supply chain risk and may not meet current procurement compliance requirements.