Murata Power Solutions 49471SC Equivalent & Substitute Parts

Part Overview

The Murata Power Solutions 49471SC is a 470 µH shielded wirewound inductor rated for 750 mA continuous current with a maximum DC resistance of 810mOhm. This surface mount component operates across the temperature range of -40°C to 85°C and is designed for applications requiring compact, shielded inductive filtering in power conversion and signal conditioning circuits. The part is currently active in production with ROHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts become necessary when primary component availability is limited, when design requirements allow for enhanced performance parameters, or when supply chain optimization is required while maintaining functional equivalence within specified electrical and mechanical tolerances.

Substiute Parts

49471SC

Murata Power Solutions Inc.In Stock: 104449471SC Datasheet

Current PartRFQ

SRR1280-471K

Bourns Inc.In Stock: 1683SRR1280-471K Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The Bourns Inc. SRR1280-471K qualifies as a direct substitute for the Murata 49471SC based on the following critical parameters:

Matching Electrical Specifications:

• Identical inductance value of 470 µH
• Shielded construction for EMI containment
• Current rating of 900 mA exceeds the 750 mA requirement
• DC resistance of 880mOhm is within acceptable tolerance relative to the 810mOhm maximum specification
• Surface mount configuration with nonstandard 4-lead package footprint

Mechanical Compatibility:

• Seated height of 0.315" (8.00mm) matches the main part specification
• Planar dimensions (0.492" x 0.492") are compatible with the 0.480" x 0.480" footprint within standard PCB layout tolerances

Compliance Alignment:

• ROHS3 compliant
• Moisture sensitivity level 1 (unlimited)
• REACH unaffected status

Parameter Comparison

Engineering Selection Recommendations

Both the Murata 49471SC and Bourns SRR1280-471K are active production components with ROHS3 compliance and identical moisture sensitivity ratings. The SRR1280-471K provides enhanced performance margins through higher current rating (900 mA vs. 750 mA) and extended operating temperature range (-40 to 125°C vs. -40 to 85°C). The tighter inductance tolerance (±10% vs. ±20%) on the Bourns part offers improved consistency for precision filtering applications. DC resistance differential of 70mOhm is within acceptable engineering margins for most power conversion topologies. Selection between these parts should be based on availability, cost considerations, and specific thermal or current margin requirements of the target application.

Frequently Asked Questions (FAQ)

Q: Can the Bourns SRR1280-471K directly replace the Murata 49471SC on existing PCBs?

A: Yes. Both components share identical seated height (0.315"), surface mount configuration, and nonstandard 4-lead package type. Planar dimensions differ by 0.012" (0.30mm), which is within standard PCB layout tolerances for surface mount placement.

Q: What is the significance of the inductance tolerance difference?

A: The Murata part specifies ±20% tolerance while the Bourns part specifies ±10%. Tighter tolerance improves circuit performance consistency but does not prevent substitution. Applications requiring specific inductance values should account for the tolerance band of whichever part is selected.

Q: How does the DC resistance difference affect circuit performance?

A: The Bourns SRR1280-471K has 880mOhm maximum DCR compared to 810mOhm for the Murata part, a difference of 70mOhm. This results in approximately 8.6% higher resistive losses at rated current. For most filtering applications, this margin is acceptable; however, designs with tight thermal budgets should evaluate power dissipation impact.

Q: Is the higher current rating of the SRR1280-471K beneficial?

A: The 900 mA rating on the Bourns part exceeds the 750 mA requirement of the Murata part, providing additional current margin. This allows operation with greater safety headroom in applications approaching the original part's current limit.

Q: Are there temperature range considerations for substitution?

A: The Bourns SRR1280-471K operates to 125°C versus 85°C for the Murata part. Applications operating near the upper temperature limit of the Murata specification benefit from the extended range of the substitute. No derating is required for applications within the original -40 to 85°C range.

Q: Do both parts meet the same compliance standards?

A: Yes. Both components are ROHS3 compliant, REACH unaffected, and carry MSL rating 1 (unlimited moisture sensitivity). Compliance documentation is equivalent for both parts.