Murata Power Solutions 49100C Fixed Inductor Equivalent & Substitute Parts

Part Overview

The Murata Power Solutions 49100C is a 10 µH shielded wirewound inductor rated for 4.5 A continuous current with a maximum DC resistance of 41 mOhm. This surface mount component operates across the industrial temperature range of -40°C to 85°C and is designed for applications requiring compact, shielded inductive filtering and energy storage in power conversion circuits.

The 49100C maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute components are identified when equivalent electrical performance can be achieved within the specified parameter tolerances while maintaining mechanical compatibility and regulatory compliance.

Substiute Parts

49100C

Murata Power Solutions Inc.In Stock: 109349100C Datasheet

Current PartRFQ

SRF1280-100M

Bourns Inc.In Stock: 1850SRF1280-100M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The Bourns SRF1280-100M is identified as a manufacturer-recommended substitute for the 49100C based on the following substitution criteria:

Electrical Equivalence (Parallel Configuration):

• Inductance: 10 µH (matched when SRF1280-100M coils are connected in parallel)
• Current Rating: 6.04 A parallel configuration (exceeds 49100C requirement of 4.5 A)
• DC Resistance: 24.1 mOhm maximum (lower than 49100C 41 mOhm maximum, providing improved efficiency)

Mechanical & Environmental Compatibility:

• Shielding: Both components are shielded
• Mounting: Both are surface mount, nonstandard 4-lead packages
• Temperature Range: SRF1280-100M operates -40°C to 125°C (exceeds 49100C range)
• Package Dimensions: 12.50 x 12.50 x 8.00 mm (footprint compatible within tolerance)
• Moisture Sensitivity: Both rated MSL 1 (Unlimited)

Regulatory Compliance:

• Both components are RoHS3 compliant
• Both are REACH unaffected
• Both carry EAR99 ECCN classification

Parameter Comparison

Engineering Selection Recommendations

The SRF1280-100M serves as a direct electrical substitute for the 49100C when configured with coils connected in parallel. Selection between these components should be based on the following engineering criteria:

Use 49100C when:

• Single-coil inductor architecture is required by circuit design
• Thermal environment is limited to 85°C maximum
• Exact 12.00 x 12.00 mm footprint is mandated by PCB layout constraints

Use SRF1280-100M when:

• Dual-coil inductor array architecture is acceptable or beneficial
• Extended temperature operation to 125°C is required
• Lower DC resistance (24.1 mOhm vs. 41 mOhm) provides thermal or efficiency advantages
• Higher current saturation margin (11.2 A vs. 4.5 A) is needed for transient protection

Both components maintain Active product status, full RoHS3 compliance, and unlimited moisture sensitivity rating. Regulatory and environmental certifications are equivalent.

Frequently Asked Questions (FAQ)

Q: Can the SRF1280-100M directly replace the 49100C without circuit modification?

A: The SRF1280-100M can replace the 49100C when the dual-coil array is configured in parallel mode, providing matched 10 µH inductance and 6.04 A current rating. However, the component is a 2-coil array rather than a single inductor. Circuit board layout and connection methodology must accommodate the parallel configuration. Verify that the nonstandard 4-lead package pinout is compatible with your PCB design.

Q: What is the difference in DC resistance between these components?

A: The 49100C has a maximum DC resistance of 41 mOhm, while the SRF1280-100M in parallel configuration has a maximum DC resistance of 24.1 mOhm. The lower resistance of the substitute reduces I²R losses and heat generation, which may improve overall circuit efficiency.

Q: Are there temperature range differences I should consider?

A: The 49100C operates from -40°C to 85°C, while the SRF1280-100M operates from -40°C to 125°C. If your application requires operation above 85°C, the SRF1280-100M provides extended thermal capability. Both components maintain their electrical specifications within their respective operating ranges.

Q: Do both components have the same package footprint?

A: The 49100C measures 12.00 x 12.00 x 8.00 mm, while the SRF1280-100M measures 12.50 x 12.50 x 8.00 mm. The 0.5 mm difference in length and width is typically accommodated within standard PCB design tolerances for surface mount components. Verify that your PCB layout allows for this minor dimensional variation.

Q: Are both components RoHS3 compliant?

A: Yes, both the 49100C and SRF1280-100M are RoHS3 compliant and REACH unaffected. Both carry EAR99 ECCN classification and are suitable for applications requiring regulatory compliance in restricted markets.

Q: What is the current saturation difference between these parts?

A: The 49100C does not specify a saturation current parameter. The SRF1280-100M in parallel configuration has a saturation current of 11.2 A, providing a 1.85x margin above the 6.04 A rated current. This higher saturation margin may provide additional protection against transient overcurrent conditions.