Murata Power Solutions 84103C Fixed Inductor - Equivalent & Substitute Parts

Part Overview

The Murata Power Solutions 84103C is a 10 µH unshielded wirewound surface mount inductor rated for 950 mA continuous current with a maximum DC resistance of 240mOhm. This component is designed for applications requiring compact fixed inductance in the 10 µH range with moderate current handling capability. The part is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts become necessary when the primary component experiences supply constraints, extended lead times, or when design requirements permit operation within the electrical and mechanical tolerances of alternative qualified inductors. The SDR0403-100ML from Bourns Inc. serves as a manufacturer-recommended equivalent that maintains the core inductance specification while offering enhanced current rating and different core material characteristics.

Substiute Parts

84103C

Murata Power Solutions Inc.In Stock: 149584103C Datasheet

Current PartRFQ

SDR0403-100ML

Bourns Inc.In Stock: 10438SDR0403-100ML Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 84103C is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 10 µH (exact match required)
• Mounting type: Surface Mount (exact match required)
• Shielding configuration: Unshielded (exact match required)
• Operating temperature range: -40°C to 125°C (minimum requirement)
• RoHS3 compliance and MSL 1 rating (regulatory requirement)

Secondary Compatibility Parameters:

• Current rating: Substitute must equal or exceed 950 mA
• DC resistance: Substitute must not exceed 240mOhm maximum
• Package footprint: Physical dimensions must accommodate PCB layout constraints
• Tolerance: ±10% to ±20% acceptable for fixed inductance applications

The SDR0403-100ML qualifies as a direct substitute because it maintains the 10 µH inductance specification, operates within the required temperature range, meets all regulatory compliance requirements, and exceeds the current handling capability of the original part while maintaining DC resistance within acceptable limits.

Parameter Comparison

Engineering Selection Recommendations

Primary Part Selection (84103C): Select the Murata 84103C when the original design specifications require the exact physical footprint of 4.50mm x 3.30mm x 2.90mm (L x W x H) and when the 950 mA current rating is sufficient for the application. This part maintains active production status with established supply channels.

Substitute Part Selection (SDR0403-100ML): Select the Bourns SDR0403-100ML when supply of the 84103C is unavailable or when the application can accommodate the slightly larger physical dimensions (4.50mm x 4.00mm x 3.50mm). The substitute provides superior electrical performance with 1.15 A current rating and lower DC resistance (180 mOhm vs. 240 mOhm), making it suitable for applications with higher current demands or lower loss requirements. Both parts maintain identical RoHS3 compliance, REACH unaffected status, and MSL 1 rating, ensuring regulatory equivalence.

Critical Consideration: PCB layout verification is required when substituting the SDR0403-100ML due to dimensional differences. The substitute is 0.7mm wider and 0.6mm taller than the original part. Confirm that the PCB footprint and component clearance accommodate these dimensional variations before implementation.

Frequently Asked Questions (FAQ)

Q: Can the SDR0403-100ML be used as a direct drop-in replacement for the 84103C?

A: The SDR0403-100ML is electrically compatible as a substitute, but physical compatibility requires verification. The substitute is 0.7mm wider (4.00mm vs. 3.30mm) and 0.6mm taller (3.50mm vs. 2.90mm). Confirm that your PCB layout and component clearance accommodate these dimensional differences before substitution.

Q: What are the key electrical differences between these two inductors?

A: Both parts maintain the 10 µH inductance specification and operate across -40°C to 125°C. The SDR0403-100ML offers higher current rating (1.15 A vs. 950 mA) and lower DC resistance (180 mOhm vs. 240 mOhm maximum). The 84103C uses standard wirewound construction, while the SDR0403-100ML uses drum core wirewound construction with ferrite core material.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the 84103C and SDR0403-100ML are ROHS3 compliant with MSL 1 (unlimited) moisture sensitivity rating and REACH unaffected status, ensuring regulatory equivalence for applications requiring environmental compliance.

Q: What is the inductance tolerance difference, and does it affect substitution?

A: The 84103C has ±10% tolerance while the SDR0403-100ML has ±20% tolerance. For fixed inductance applications, both tolerance ranges are typically acceptable. Verify that your circuit design can accommodate the wider tolerance of the substitute if inductance precision is critical to circuit performance.

Q: Which part should I select for new designs?

A: For new designs, either part is acceptable based on availability and performance requirements. The SDR0403-100ML offers superior electrical performance (higher current rating, lower resistance) but requires PCB layout verification due to larger physical dimensions. The 84103C maintains a smaller footprint if space is constrained.

Q: Are there any frequency-dependent characteristics I should consider?

A: The SDR0403-100ML provides specified frequency characteristics: Q of 28 at 2.52 MHz and self-resonant frequency of 33 MHz. The 84103C does not specify these parameters. If your application operates near these frequency ranges, evaluate whether the substitute's frequency response is suitable for your circuit requirements.