Murata Power Solutions 49331SC Equivalent & Substitute Parts

Part Overview

The Murata Power Solutions 49331SC is a 330 µH shielded wirewound inductor rated for 900 mA continuous current with a maximum DC resistance of 550mOhm. This surface mount component operates across the -40°C to 85°C temperature range 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 permit relaxed tolerance specifications, or when enhanced current handling capability is beneficial for system reliability margins.

Substiute Parts

49331SC

Murata Power SolutionsIn Stock: 125049331SC Datasheet

Current PartRFQ

SRR1280-331K

Bourns Inc.In Stock: 14239SRR1280-331K Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The Bourns Inc. SRR1280-331K qualifies as a direct substitute based on the following critical parameters:

Matching Specifications:

• Identical inductance value: 330 µH
• Shielded construction maintained
• Surface mount configuration preserved
• Nonstandard package footprint compatibility (12.50mm x 12.50mm vs. 12.20mm x 12.20mm, within assembly tolerance)
• Identical seated height: 0.315" (8.00mm)
• ROHS3 compliance maintained
• Unlimited moisture sensitivity rating (MSL 1) maintained

Enhanced Capabilities:

• Higher current rating: 1.1 A vs. 900 mA (22% increase)
• Extended operating temperature range: -40°C to 125°C vs. -40°C to 85°C
• Tighter inductance tolerance: ±10% vs. ±20%

Acceptable Parameter Differences:

• DCR increase from 550mOhm to 600mOhm (9% increase, within typical design margins)
• Ferrite drum core construction vs. wirewound (both shielded, functionally equivalent for specified inductance)

Parameter Comparison

Engineering Selection Recommendations

Both the Murata 49331SC and Bourns SRR1280-331K are active production components with ROHS3 compliance and identical moisture sensitivity ratings. The SRR1280-331K provides enhanced design margins through increased current rating (1.1 A vs. 900 mA) and extended temperature operating range (-40°C to 125°C vs. -40°C to 85°C), making it suitable for applications requiring thermal headroom or higher current transient tolerance. The tighter inductance tolerance (±10% vs. ±20%) on the Bourns part reduces circuit performance variation. The 9% increase in DCR (600mOhm vs. 550mOhm) and minor footprint size difference (12.50mm vs. 12.20mm) are within typical PCB assembly and thermal design tolerances for this component class.

Frequently Asked Questions (FAQ)

Q: Can the SRR1280-331K directly replace the 49331SC in existing designs?

A: Yes. Both parts maintain identical inductance (330 µH), shielding, surface mount configuration, and seated height. The footprint difference (12.50mm vs. 12.20mm) is within standard PCB assembly tolerances. Verify that the 9% DCR increase and extended temperature range do not conflict with thermal or power dissipation requirements.

Q: What is the impact of the DCR increase from 550mOhm to 600mOhm?

A: At the 900 mA design current, the additional power dissipation is approximately 45 mW (0.9A² × 0.050Ω). This is typically negligible in most filtering applications but should be verified in thermally constrained designs.

Q: Why does the Bourns part have a tighter inductance tolerance?

A: The SRR1280-331K uses ferrite drum core construction with tighter manufacturing controls, resulting in ±10% tolerance versus ±20% for the Murata wirewound design. This reduces circuit performance variation and improves consistency across production batches.

Q: Are there any compliance or certification differences?

A: Both parts are ROHS3 compliant, REACH unaffected, and carry identical moisture sensitivity ratings (MSL 1, Unlimited). No compliance barriers exist for substitution.

Q: What is the significance of the extended temperature range on the Bourns part?

A: The SRR1280-331K operates to 125°C versus 85°C for the Murata part. This provides additional thermal margin in applications subject to elevated ambient temperatures or self-heating from sustained current operation.