40331C Equivalent & Substitute Parts

Part Overview

The Murata Power Solutions 40331C is a 330 µH unshielded toroidal surface mount inductor rated for 540 mA with a maximum DC resistance of 610mOhm. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and procurement continuity. The part operates across an industrial temperature range of -40°C to 85°C and is RoHS compliant.

Substiute Parts

40331C

Murata Power SolutionsIn Stock: 101040331C Datasheet

Current PartRFQ

SH50S-0.9-330

Amgis, LLCIn Stock: 3240SH50S-0.9-330 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The Amgis, LLC SH50S-0.9-330 qualifies as a substitute for the 40331C based on the following critical parameters:

Matching Parameters:

• Inductance: 330 µH (identical)
• Type: Toroidal (identical)
• Shielding: Unshielded (identical)
• Mounting Type: Surface Mount (identical)
• Inductance Test Frequency: 10 kHz (identical)
• RoHS Compliance: Both parts meet RoHS requirements

Enhanced Specifications: The SH50S-0.9-330 provides superior electrical performance with a current rating of 900 mA (compared to 540 mA) and an extended operating temperature range of -40°C to 125°C (compared to -40°C to 85°C). The DC resistance of 740mOhm Max is within acceptable tolerance for this inductance class.

Parameter Comparison

Engineering Selection Recommendations

The SH50S-0.9-330 is the designated substitute for the obsolete 40331C. Both parts maintain identical inductance values and core topology, ensuring functional equivalence in circuit applications. The substitute part carries active product status with ROHS3 compliance, providing long-term availability and regulatory alignment. The SH50S-0.9-330 demonstrates enhanced current handling capability and extended temperature range, making it suitable for applications requiring the original 40331C specifications or greater performance margins.

Frequently Asked Questions (FAQ)

Q: Can the SH50S-0.9-330 directly replace the 40331C in existing designs?

A: Yes. Both parts share identical inductance (330 µH), toroidal topology, unshielded configuration, and surface mount packaging. The substitute part meets or exceeds all critical electrical parameters of the original component.

Q: What are the physical dimension differences between these parts?

A: The SH50S-0.9-330 has larger footprint dimensions (17.80mm L x 17.00mm W x 11.45mm H) compared to the 40331C (14.22mm L x 14.10mm W x 8.76mm H). PCB layout verification is necessary to confirm mechanical compatibility.

Q: How do the DC resistance values compare?

A: The 40331C specifies 610mOhm Max, while the SH50S-0.9-330 specifies 740mOhm Max. This 130mOhm difference represents approximately 21% higher resistance in the substitute part and should be evaluated against circuit power dissipation requirements.

Q: Is the higher current rating of the SH50S-0.9-330 a concern?

A: No. The substitute part's 900 mA rating exceeds the original 540 mA requirement, providing additional design margin without adverse effects on circuit operation.

Q: What is the tolerance specification for the SH50S-0.9-330?

A: The SH50S-0.9-330 carries an inductance tolerance of ±20%. The original 40331C tolerance specification was not provided in the available data.

Q: Are there packaging differences?

A: The 40331C uses nonstandard packaging, while the SH50S-0.9-330 is supplied in Tape & Reel (TR) format. This affects procurement and assembly processes but does not impact electrical performance.