Murata Power Solutions 18254C Fixed Inductor - Equivalent & Substitute Parts

Part Overview

The Murata Power Solutions 18254C is a 250 µH unshielded wirewound inductor rated for 800 mA continuous current with a maximum DC resistance of 255mOhm. Designed for through-hole axial mounting, this component operates across a 0°C to 70°C temperature range and is classified as obsolete. Due to its obsolete product status, identifying functionally equivalent active alternatives is essential for ongoing design support, production continuity, and long-term component availability.

Substiute Parts

18254C

Murata Power Solutions Inc.In Stock: 112518254C Datasheet

Current PartRFQ

LPA1020-251KL

Bourns Inc.In Stock: 1039LPA1020-251KL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The Bourns Inc. LPA1020-251KL qualifies as a functional substitute for the Murata 18254C based on the following critical parameters:

• Inductance Value: Both parts specify 250 µH at 1 kHz test frequency with ±10% tolerance, ensuring electrical equivalence in circuit applications.
• Current Rating: Both components are rated for 800 mA continuous current, maintaining identical load capacity.
• Mounting Configuration: Both employ through-hole axial mounting, permitting direct board-level replacement without layout modification.
• Shielding Classification: Both are unshielded inductors, maintaining electromagnetic compatibility characteristics.
• Regulatory Compliance: Both achieve RoHS compliance and REACH unaffected status, satisfying environmental and regulatory requirements.

The primary distinction lies in DC resistance specification: the Bourns substitute exhibits 500mOhm maximum DCR compared to the Murata original's 255mOhm maximum. This parameter difference must be evaluated within specific circuit thermal and efficiency requirements.

Parameter Comparison

Engineering Selection Recommendations

The Bourns LPA1020-251KL represents an active, production-supported alternative to the obsolete Murata 18254C. Both components maintain identical inductance values, current ratings, and mounting configurations, establishing functional compatibility at the circuit level.

The Bourns substitute carries ROHS3 compliance, representing current regulatory alignment superior to the original RoHS designation. Both components maintain REACH unaffected status, confirming compliance with chemical substance restrictions.

Selection between these components should prioritize the active product status of the Bourns LPA1020-251KL for new designs and ongoing production requirements. The elevated DC resistance specification of the substitute (500mOhm versus 255mOhm) introduces increased resistive losses and thermal dissipation that must be evaluated within specific application thermal budgets and efficiency targets.

Frequently Asked Questions (FAQ)

Q: Can the Bourns LPA1020-251KL directly replace the Murata 18254C in existing designs?

A: Yes, from a mounting and electrical connectivity perspective. Both components feature identical through-hole axial configuration and 250 µH inductance specification. However, the increased DC resistance of the Bourns part (500mOhm maximum versus 255mOhm maximum) will generate additional heat under identical current conditions. Circuit thermal analysis is required to confirm acceptability within your specific application.

Q: What is the significance of the DC resistance difference between these parts?

A: DC resistance directly determines resistive power loss in the inductor. At 800 mA, the Murata original dissipates approximately 163 mW maximum, while the Bourns substitute dissipates approximately 320 mW maximum. This 2x increase in power dissipation affects thermal management and overall circuit efficiency.

Q: Are both components suitable for new product designs?

A: The Bourns LPA1020-251KL is the appropriate choice for new designs, as it carries active product status with ongoing manufacturer support. The Murata 18254C is obsolete and should not be specified for new development.

Q: Do these components require different PCB footprints?

A: Both components employ through-hole axial mounting. Physical dimensions differ slightly (Murata: 0.539" Dia × 0.719" L; Bourns: 0.394" Dia × 0.787" L), but standard through-hole axial footprints accommodate both packages without modification.

Q: What compliance certifications apply to both components?

A: Both achieve RoHS compliance and REACH unaffected status. The Bourns component carries ROHS3 designation, representing alignment with current regulatory requirements.