Murata Power Solutions 40101C Fixed Inductor Equivalent & Substitute Parts

Part Overview

The Murata Power Solutions 40101C is a 100 µH unshielded toroidal surface mount inductor rated for 940 mA continuous current with a maximum DC resistance of 177mOhm. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The part operates across an industrial temperature range of -40°C to 85°C and is RoHS compliant with unlimited moisture sensitivity rating.

Substiute Parts

40101C

Murata Power Solutions Inc.In Stock: 90840101C Datasheet

Current PartRFQ

PL8505NL

iNRCORE, LLCIn Stock: 960PL8505NL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 40101C is determined by the following critical parameters:

Inductance Value: The substitute must maintain 100 µH inductance to preserve circuit functionality and frequency response characteristics.

Current Rating: The substitute must support the application's current requirements. The 40101C is rated for 940 mA; substitutes with equal or higher current ratings are acceptable.

DC Resistance: The substitute's DCR must not exceed the original specification to prevent excessive power dissipation and thermal effects in the circuit.

Toroidal Unshielded Configuration: The substitute must maintain the same core type and shielding characteristics to ensure electromagnetic compatibility and circuit performance.

Surface Mount Nonstandard Package: The substitute must be compatible with surface mount assembly processes and fit within the specified dimensional envelope.

Temperature Range: The substitute must support the operating temperature range or exceed it to ensure reliability across all operating conditions.

RoHS Compliance: The substitute must meet current environmental and regulatory requirements.

Parameter Comparison

Engineering Selection Recommendations

The iNRCORE PL8505NL is identified as a functional substitute for the obsolete Murata 40101C based on matching inductance value, toroidal unshielded configuration, and surface mount assembly compatibility.

Advantages of PL8505NL:

• Higher current rating (1.2 A vs. 940 mA) provides design margin for current-limited applications
• Extended operating temperature range (-40°C to 130°C) exceeds original specification
• Active product status ensures ongoing availability and supply chain continuity
• ROHS3 compliance meets current regulatory requirements

Design Considerations:

• DC resistance is higher (285mOhm vs. 177mOhm), resulting in increased power dissipation. Calculate thermal impact: ΔP = I²R differential across the two parts at maximum current
• Physical dimensions differ slightly; verify PCB footprint and layout clearances before implementation
• Lower seated height may affect mechanical assembly or shielding considerations in constrained designs

Both parts carry unlimited moisture sensitivity (MSL 1) and are classified under identical HTSUS codes, confirming functional equivalence for tariff and compliance purposes.

Frequently Asked Questions (FAQ)

Q: Can the PL8505NL directly replace the 40101C without circuit modification?

A: The PL8505NL maintains the same inductance value and core configuration, making it functionally compatible. However, the higher DC resistance will increase power dissipation. Calculate the thermal impact at your operating current before implementation. Physical dimensions differ slightly; verify PCB layout compatibility.

Q: What is the significance of the higher current rating on the PL8505NL?

A: The PL8505NL is rated for 1.2 A compared to the 40101C's 940 mA. This provides additional design margin and allows the substitute to operate at lower stress levels in current-limited applications, potentially improving reliability and thermal performance.

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

A: Higher DC resistance increases I²R losses, resulting in greater heat generation at the same current level. For a 940 mA application, the PL8505NL will dissipate approximately 0.25 mW more than the original part. Verify that thermal management and circuit design accommodate this difference.

Q: Are there dimensional constraints I should consider?

A: Yes. The PL8505NL is slightly larger in length (15.88mm vs. 14.22mm) and width (13.34mm vs. 14.10mm) but has a lower seated height (8.12mm vs. 8.76mm). Confirm that your PCB layout and mechanical assembly accommodate these differences.

Q: Do both parts meet current compliance requirements?

A: Yes. The 40101C is RoHS compliant, and the PL8505NL is ROHS3 compliant, meeting all current environmental and regulatory standards. Both parts are unaffected by REACH restrictions.

Q: What is the temperature operating range difference?

A: The 40101C operates from -40°C to 85°C, while the PL8505NL extends to 130°C. The substitute provides a wider operating window, which is beneficial for applications subject to thermal cycling or elevated ambient conditions.