Murata Power Solutions 47681SC Equivalent & Substitute Parts

Part Overview

The Murata Power Solutions 47681SC is a 680 µH shielded wirewound inductor rated for 480 mA with a maximum DC resistance of 1.78Ohm. This component is designed for surface mount applications in the nonstandard 4-lead package format. The part is currently obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. Identifying compatible alternatives requires matching the core electrical specifications while accounting for dimensional and performance variations across available substitute options.

Substiute Parts

47681SC

Murata Power Solutions Inc.In Stock: 95747681SC Datasheet

Current PartRFQ

B82477G4684M000

EPCOS - TDK ElectronicsIn Stock: 2365B82477G4684M000 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 47681SC is determined by the following critical parameters:

• Inductance Value: 680 µH with ±20% tolerance
• Current Rating: Minimum 480 mA to support the original design current
• DC Resistance: Lower DCR values improve efficiency; the original 1.78Ohm maximum establishes the baseline
• Shielding: Shielded construction required to maintain electromagnetic isolation
• Surface Mount Configuration: Nonstandard package footprint compatibility
• Operating Temperature: -40°C ~ 85°C minimum range
• Compliance: RoHS and REACH compliance for regulatory alignment

The EPCOS B82477G4684M000 qualifies as a manufacturer-recommended substitute by meeting or exceeding these core parameters while offering improved current handling and lower DC resistance.

Parameter Comparison

Engineering Selection Recommendations

The EPCOS B82477G4684M000 is the manufacturer-recommended substitute for the obsolete Murata 47681SC. Selection of this alternative is supported by the following factors:

Electrical Compatibility: The substitute maintains the 680 µH inductance value with identical ±20% tolerance. The higher current rating (680 mA vs. 480 mA) and improved DC resistance (1.24Ohm vs. 1.78Ohm) provide enhanced performance margins and reduced power dissipation in the target application.

Regulatory Compliance: Both components maintain RoHS and REACH compliance. The substitute achieves ROHS3 certification, meeting current regulatory requirements for new designs and production runs.

Thermal Performance: The extended operating temperature range (-55°C ~ 125°C) of the substitute exceeds the original specification (-40°C ~ 85°C), providing additional thermal margin for demanding environments.

Packaging and Availability: The substitute is available in Tape & Reel packaging with confirmed inventory (2296 Pcs), supporting high-volume production requirements. The nonstandard package footprint requires PCB layout evaluation for dimensional compatibility.

Frequently Asked Questions (FAQ)

Q: Can the B82477G4684M000 directly replace the 47681SC without PCB modifications?

A: The substitute maintains the same inductance and shielded construction but differs in physical dimensions. The B82477G4684M000 measures 0.504" x 0.504" x 0.315" (height) compared to the original 0.480" x 0.480" x 0.197". PCB footprint compatibility must be evaluated before implementation.

Q: What is the impact of the lower DC resistance in the substitute?

A: The B82477G4684M000 exhibits 1.24Ohm maximum DCR versus 1.78Ohm in the original. This 30% reduction in resistance decreases power dissipation and heat generation, improving overall circuit efficiency without affecting the inductance value or current rating requirements.

Q: Are there compliance differences between the two parts?

A: Both components are RoHS and REACH compliant. The substitute achieves ROHS3 certification, which represents the current regulatory standard. Moisture sensitivity levels are identical (MSL 1 - Unlimited) for both parts.

Q: What is the significance of the higher saturation current in the substitute?

A: The B82477G4684M000 specifies a saturation current (Isat) of 780 mA, compared to no specification for the original part. This parameter indicates the current level at which the inductor begins to lose inductance due to core saturation. The higher saturation current provides additional design margin for transient current conditions.

Q: How does the extended temperature range affect application suitability?

A: The substitute operates from -55°C to 125°C versus the original -40°C to 85°C range. This extended range supports applications in industrial and automotive environments with more extreme thermal conditions, though the original specification remains the design baseline.

Q: Is the Tape & Reel packaging compatible with existing assembly processes?

A: Tape & Reel packaging is standard for automated surface mount assembly. Compatibility depends on your assembly equipment specifications and feeder compatibility. Confirm with your manufacturing partner that the nonstandard package dimensions are supported by your pick-and-place equipment.