Murata Power Solutions 35251C Equivalent & Substitute Parts

Part Overview

The Murata Power Solutions 35251C is a 250 nH unshielded wirewound surface mount inductor rated for 15.5 A continuous current with a maximum DC resistance of 4.5 mOhm. Designed for high-current applications requiring low inductance values, this component operates across the industrial temperature range of -40°C to 125°C. The part is classified as obsolete, making identification of compatible substitute components essential for ongoing design support and procurement continuity.

Substiute Parts

35251C

Murata Power Solutions Inc.In Stock: 116235251C Datasheet

Current PartRFQ

744310024

Würth ElektronikIn Stock: 4061744310024 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 35251C is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Inductance value within acceptable tolerance band (240–260 nH accounting for ±25% tolerance)
• Current rating equal to or exceeding 15.5 A continuous
• DC resistance not exceeding 4.5 mOhm to maintain thermal and efficiency characteristics
• Operating temperature range encompassing -40°C to 125°C minimum

Mechanical Compatibility Criteria:

• Surface mount package configuration
• Physical footprint compatible with 6.80 mm × 6.80 mm mounting area
• Height within acceptable PCB assembly constraints (3.20 mm reference)

Regulatory & Quality Criteria:

• Moisture sensitivity level MSL 1 or better
• REACH compliance status matching or exceeding the original part

The Würth Elektronik 744310024 meets these substitution criteria with equivalent inductance (240 nH), superior current rating (18 A), improved DC resistance (1.8 mOhm), and extended temperature range (-40°C to 150°C).

Parameter Comparison

Engineering Selection Recommendations

The Würth Elektronik 744310024 is the qualified substitute for the obsolete Murata 35251C based on the following engineering factors:

Electrical Performance: The 744310024 delivers equivalent inductance (240 nH versus 250 nH) within the combined tolerance windows of both parts. The substitute provides superior current handling (18 A continuous versus 15.5 A) and significantly lower DC resistance (1.8 mOhm versus 4.5 mOhm maximum), resulting in reduced power dissipation and improved thermal performance.

Regulatory Compliance: Both parts maintain identical REACH compliance status (REACH Unaffected) and moisture sensitivity classification (MSL 1). The substitute carries AEC-Q200 automotive qualification, providing additional reliability assurance for demanding applications.

Temperature Performance: The 744310024 extends the upper operating temperature limit to 150°C, exceeding the original part's 125°C maximum and providing enhanced thermal margin for high-current applications.

Physical Integration: Dimensional differences are minimal (7.00 mm × 6.90 mm × 3.30 mm versus 6.80 mm × 6.80 mm × 3.20 mm). PCB layout verification is required to confirm footprint compatibility within the specific application assembly.

Frequently Asked Questions (FAQ)

Q: Can the Würth Elektronik 744310024 directly replace the Murata 35251C in existing designs?

A: Electrical substitution is valid based on inductance equivalence and superior current/resistance ratings. Physical footprint verification is mandatory due to minor dimensional differences (approximately 0.2 mm in length and width, 0.1 mm in height). PCB layout and assembly process validation is required before production implementation.

Q: What is the significance of the shielding difference between the two parts?

A: The original 35251C is unshielded, while the 744310024 is shielded. Shielding reduces electromagnetic interference emission and susceptibility. In applications where EMI performance is critical, the shielded substitute may provide improved system-level performance. In noise-sensitive circuits, shielding characteristics should be evaluated against specific application requirements.

Q: How do the inductance tolerances affect circuit performance?

A: The 35251C specifies ±25% tolerance, while the 744310024 specifies ±20% tolerance. The substitute provides tighter tolerance control. For circuits with inductance-dependent frequency response or filtering characteristics, the improved tolerance of the substitute may enhance performance consistency across production batches.

Q: Is the extended temperature range of the 744310024 significant for this application?

A: The substitute operates to 150°C versus the original 125°C maximum. This extended range provides additional thermal margin in high-current or high-ambient-temperature environments. Applications operating near the original 125°C limit benefit from the additional 25°C headroom.

Q: What procurement considerations apply to this substitution?

A: The 35251C is classified as obsolete with limited inventory availability. The 744310024 is active production with established supply chain presence (4019 pieces in stock versus 1111 pieces for the original). Transition to the substitute is recommended for new designs and ongoing production to ensure long-term component availability.