Murata Power Solutions 28682C Fixed Inductor - Equivalent & Substitute Parts

Part Overview

The Murata Power Solutions 28682C is a 6.8 µH unshielded wirewound surface mount inductor rated for 6.8 A continuous current with a maximum DC resistance of 14 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 suitable for applications requiring compact, high-current inductive filtering or energy storage in power conversion circuits.

Substiute Parts

28682C

Murata Power Solutions Inc.In Stock: 89328682C Datasheet

Current PartRFQ

SC4020FH-6R8

Signal TransformerIn Stock: 983SC4020FH-6R8 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Murata 28682C is determined by the following critical electrical and mechanical parameters:

• Inductance Value: Must match 6.8 µH exactly
• Current Rating: Substitute must support minimum 6.8 A; lower ratings are not acceptable
• DC Resistance: Lower DCR values are preferred for efficiency; higher values may be acceptable depending on thermal constraints
• Mounting Type: Surface mount configuration required
• Operating Temperature Range: Must support -40°C to 125°C minimum
• Shielding Configuration: Unshielded topology maintained
• Core Type: Wirewound construction

The Signal Transformer SC4020FH-6R8 meets these substitution criteria with equivalent inductance and compatible current handling, though with trade-offs in DC resistance and physical dimensions.

Parameter Comparison

Engineering Selection Recommendations

The Signal Transformer SC4020FH-6R8 is an active product suitable for replacing the obsolete Murata 28682C in most applications. Key considerations:

Electrical Compatibility: Both parts provide 6.8 µH inductance and operate within the same temperature range. The SC4020FH-6R8 carries a rated current of 6.2 A versus the original 6.8 A; applications operating at or near the 6.8 A maximum should be evaluated for thermal margin with the higher 22 mOhm DCR.

Compliance Status: The SC4020FH-6R8 is RoHS3 compliant and REACH unaffected, providing regulatory alignment for modern procurement requirements. Both parts carry EAR99 classification.

Physical Integration: Dimensional differences exist between the parts. The SC4020FH-6R8 is slightly longer (19.50 mm vs 18.50 mm) and narrower (13.30 mm vs 15.20 mm) with reduced height (6.90 mm vs 7.60 mm). PCB layout verification is required to confirm fit within existing footprints.

Packaging: The SC4020FH-6R8 is supplied in Tape & Reel format, supporting automated assembly workflows.

Frequently Asked Questions (FAQ)

Q: Can the SC4020FH-6R8 directly replace the Murata 28682C in all applications?

A: Electrical substitution is valid for inductance and temperature range. However, the 0.6 A reduction in current rating and 8 mOhm increase in DCR require application-level verification. Thermal analysis is recommended for designs operating near maximum current specifications.

Q: What is the impact of the higher DC resistance in the SC4020FH-6R8?

A: The 22 mOhm DCR versus 14 mOhm results in increased resistive losses. In a 6.8 A circuit, this represents approximately 0.32 W additional dissipation compared to the original part. Thermal management and efficiency calculations should be updated accordingly.

Q: Are there physical footprint compatibility concerns?

A: Yes. The SC4020FH-6R8 has different length, width, and height dimensions. Existing PCB layouts designed for the 28682C must be verified for mechanical clearance and solder pad alignment before implementation.

Q: Why is the Murata 28682C obsolete?

A: Obsolescence typically results from manufacturer discontinuation decisions. The Signal Transformer SC4020FH-6R8 represents an active alternative with equivalent core specifications and modern compliance certifications.

Q: What certifications apply to the substitute part?

A: The SC4020FH-6R8 is RoHS3 compliant, REACH unaffected, and carries EAR99 export classification, consistent with the original part's regulatory status.