Murata Power Solutions 49101C Equivalent & Substitute Parts

Part Overview

The Murata Power Solutions 49101C is a 100 µH shielded wirewound inductor rated for 1.41 A continuous current with a maximum DC resistance of 343mOhm. This surface mount component operates across the industrial temperature range of -40°C to 85°C and is designed for applications requiring stable inductance at 10 kHz test frequency. The part maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Equivalent parts are identified when substitute components maintain the same inductance value, comparable current ratings, and compatible mechanical form factors while meeting equivalent environmental and compliance standards.

Substiute Parts

49101C

Murata Power Solutions Inc.In Stock: 88149101C Datasheet

Current PartRFQ

SRF1280-101M

Bourns Inc.In Stock: 1645SRF1280-101M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The Bourns SRF1280-101M qualifies as an equivalent substitute based on the following substitution criteria:

Inductance Compatibility: The SRF1280-101M is a 2-coil inductor array that provides 100 µH inductance when coils are connected in parallel, matching the primary inductance specification of the 49101C.

Current Rating Alignment: The parallel configuration of the SRF1280-101M supports 1.96 A continuous current, which exceeds the 49101C requirement of 1.41 A, providing adequate current capacity for direct substitution.

DC Resistance Specification: The SRF1280-101M parallel configuration exhibits 175mOhm maximum DC resistance, which is lower than the 49101C specification of 343mOhm, resulting in improved efficiency characteristics.

Mechanical Compatibility: Both components feature identical surface mount technology with nonstandard 4-lead packages and comparable physical dimensions (12.00mm x 12.00mm footprint for 49101C; 12.50mm x 12.50mm for SRF1280-101M), permitting direct board-level substitution.

Environmental and Compliance Alignment: Both parts operate across overlapping temperature ranges, maintain ROHS3 compliance, and carry MSL 1 moisture sensitivity ratings, ensuring equivalent reliability in production and field deployment.

Parameter Comparison

Engineering Selection Recommendations

The Bourns SRF1280-101M serves as a direct functional equivalent to the Murata 49101C for applications requiring 100 µH inductance at 1.41 A or lower current levels. Both components maintain Active product status with full ROHS3 compliance and identical moisture sensitivity ratings, ensuring equivalent supply chain reliability and regulatory acceptance.

The SRF1280-101M provides performance advantages including higher current capacity (1.96 A parallel rating versus 1.41 A) and lower DC resistance (175mOhm versus 343mOhm), making it suitable for applications where improved efficiency or thermal performance is beneficial. The extended operating temperature range of the Bourns component (-40°C to 125°C versus -40°C to 85°C) accommodates higher-temperature environments without performance degradation.

Footprint compatibility is maintained within standard PCB design tolerances, with the SRF1280-101M requiring only 0.5mm additional board space in each lateral dimension. Both components carry identical EAR99 export classification and HTSUS commodity codes, simplifying procurement and regulatory documentation.

Frequently Asked Questions (FAQ)

Q: Can the SRF1280-101M directly replace the 49101C without circuit modifications?

A: Yes. The SRF1280-101M parallel configuration provides identical 100 µH inductance and exceeds the current rating requirement. Both components feature matching surface mount packages, shielding characteristics, and lead configurations. No circuit modifications are required for direct substitution.

Q: What is the significance of the SRF1280-101M being a 2-coil array?

A: The SRF1280-101M contains two independent coils that can be configured in series (400 µH) or parallel (100 µH). For substitution of the 49101C, the parallel configuration is used, delivering the required 100 µH inductance. The series configuration is not applicable to this substitution.

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

A: The SRF1280-101M parallel configuration exhibits 175mOhm maximum DC resistance compared to the 49101C specification of 343mOhm. Lower DC resistance reduces resistive losses and heat generation during operation, improving overall circuit efficiency. This represents a performance advantage for thermal-sensitive applications.

Q: Are there footprint considerations for PCB layout?

A: The SRF1280-101M footprint measures 12.50mm x 12.50mm compared to the 49101C at 12.00mm x 12.00mm. This 0.5mm increase in each dimension is within standard PCB design tolerances and does not typically require layout modifications. Both components maintain identical 8.00mm maximum height specifications.

Q: Do both parts meet the same compliance and environmental standards?

A: Yes. Both the 49101C and SRF1280-101M maintain ROHS3 compliance, carry MSL 1 (Unlimited) moisture sensitivity ratings, and share identical EAR99 export classifications. The SRF1280-101M provides an extended operating temperature range (-40°C to 125°C versus -40°C to 85°C), offering additional environmental margin for demanding applications.

Q: What is the current saturation specification for the SRF1280-101M parallel configuration?

A: The SRF1280-101M parallel configuration exhibits a current saturation (Isat) specification of 3.64 A, significantly exceeding the 1.41 A continuous current requirement of the 49101C. This provides substantial margin for transient current conditions and circuit protection coordination.