Murata Power Solutions 49150C Equivalent & Substitute Parts

Part Overview

The Murata Power Solutions 49150C is a 15 µH shielded wirewound inductor rated for 3.7 A continuous current with a maximum DC resistance of 53mOhm. 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 in power conversion and signal conditioning circuits. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are identified when they maintain the critical electrical parameters—specifically inductance value, current rating, and DC resistance—while accommodating variations in package dimensions, temperature range, and coil configuration that do not compromise circuit performance.

Substiute Parts

49150C

Murata Power Solutions Inc.In Stock: 98549150C Datasheet

Current PartRFQ

SRF1280-150M

Bourns Inc.In Stock: 1902SRF1280-150M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The Bourns SRF1280-150M qualifies as a functional substitute for the Murata 49150C based on the following substitution criteria:

Matching Electrical Parameters:

• Inductance (parallel configuration): 15 µH — identical to the main part
• Current Rating (parallel configuration): 5.03 A — exceeds the 3.7 A requirement
• DC Resistance (parallel configuration): 33.3mOhm Max — lower than the 53mOhm maximum, providing improved efficiency

Mechanical and Environmental Compatibility:

• Surface mount construction with nonstandard 4-lead package
• Shielded design matching the main part's EMI containment
• Operating temperature range: -40°C to 125°C — extends beyond the main part's -40°C to 85°C range
• Package dimensions: 12.50 × 12.50 × 8.00 mm — minimal variation from the main part (0.5 mm increase in length and width)
• MSL 1 rating and ROHS3 compliance — equivalent environmental qualification

Configuration Note: The SRF1280-150M is a 2-coil inductor array. When configured in parallel, it delivers the required 15 µH inductance with superior current handling and lower DC resistance compared to the single-coil 49150C.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (Murata 49150C): Use when the exact package footprint of 12.00 × 12.00 mm is required and the operating temperature ceiling of 85°C is sufficient for the application. This part is in active production with established supply chain availability.

Substitute Selection (Bourns SRF1280-150M): Use when any of the following conditions apply:

• Higher current margin is required (5.03 A vs. 3.7 A rating)
• Lower DC resistance is beneficial for thermal management (33.3mOhm vs. 53mOhm)
• Extended temperature operation up to 125°C is needed
• The 0.5 mm increase in package footprint (12.50 × 12.50 mm) is accommodated in the PCB layout

Both parts maintain ROHS3 compliance, unlimited MSL rating, and shielded construction. The substitute provides superior electrical performance with minimal dimensional variation.

Frequently Asked Questions (FAQ)

Q: Can the Bourns SRF1280-150M be used as a direct drop-in replacement for the Murata 49150C?

A: The SRF1280-150M is functionally equivalent when configured in parallel mode, delivering identical 15 µH inductance and superior current handling. The package footprint increases by 0.5 mm in length and width (12.50 × 12.50 mm vs. 12.00 × 12.00 mm). PCB layout must accommodate this dimensional change. Both parts use surface mount technology with compatible lead configurations.

Q: What is the difference between the series and parallel configurations of the SRF1280-150M?

A: The SRF1280-150M contains two coils that can be connected in series or parallel. In parallel configuration (used for substitution), it provides 15 µH inductance with 5.03 A current rating and 33.3mOhm DCR. In series configuration, it provides 60 µH inductance with 2.51 A current rating and 129mOhm DCR. Only the parallel configuration matches the 49150C specifications.

Q: Are there temperature range differences between these parts?

A: Yes. The Murata 49150C operates from -40°C to 85°C, while the Bourns SRF1280-150M operates from -40°C to 125°C. The substitute part extends the upper temperature limit by 40°C, making it suitable for higher-temperature applications. Both parts maintain performance across the full industrial temperature range.

Q: How do the DC resistance values affect circuit performance?

A: The Bourns substitute has lower DC resistance (33.3mOhm vs. 53mOhm), resulting in reduced resistive losses and lower heat generation during operation. This is advantageous in power conversion applications where thermal management is critical. The lower resistance also provides improved efficiency at the rated current levels.

Q: Are both parts RoHS and REACH compliant?

A: Yes. Both the Murata 49150C and Bourns SRF1280-150M are ROHS3 compliant and REACH unaffected. Both carry MSL 1 (unlimited) moisture sensitivity ratings, making them suitable for standard PCB assembly and storage conditions without special handling requirements.