49151C Equivalent & Substitute Parts

Part Overview

The 49151C is a fixed shielded wirewound inductor manufactured by Murata Power Solutions Inc., rated at 150 µH inductance with a maximum current rating of 1.15 A and DC resistance of 529mOhm. This component is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating. Alternative components become necessary when addressing supply chain constraints, extended lead times, or specific application requirements that demand compatible electrical and mechanical characteristics within the defined parameter envelope.

Key Parameters

Parameter	Value
Inductance	150 µH
Current Rating	1.15 A
DC Resistance (DCR)	529mOhm Max
Shielding	Shielded
Mounting Type	Surface Mount
Package Type	Nonstandard, 4 Lead
Size	12.00mm x 12.00mm x 8.00mm (Max Height)
Operating Temperature Range	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 49151C is determined by the following critical parameters:

Primary Electrical Criteria:

Inductance value of 150 µH (parallel configuration acceptable for multi-coil arrays)
Current rating minimum of 1.15 A under parallel configuration
DC resistance not exceeding 529mOhm in the applicable configuration
Shielded construction requirement

Mechanical Criteria:

Surface mount technology
Physical dimensions compatible with 12.00mm x 12.00mm footprint envelope
Height not exceeding 8.00mm maximum seated height

Compliance & Environmental:

RoHS3 compliance mandatory
Operating temperature range minimum -40°C ~ 85°C
Moisture sensitivity level 1 (unlimited)

The SRF1280-151M qualifies as a substitute based on its parallel configuration delivery of 150 µH inductance, 1.59 A parallel current rating (exceeding the 1.15 A requirement), 261mOhm parallel DC resistance (within specification), shielded construction, surface mount design, compatible footprint dimensions, and full RoHS3 compliance.

Parameter Comparison

Parameter	49151C (Murata)	SRF1280-151M (Bourns)	Compatibility Notes
Inductance	150 µH	150 µH (Parallel)	Equivalent in parallel configuration
Current Rating	1.15 A	1.59 A (Parallel)	Substitute exceeds requirement
DC Resistance (DCR)	529mOhm Max	261mOhm Max (Parallel)	Substitute provides lower resistance
Shielding	Shielded	Shielded	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package Type	Nonstandard, 4 Lead	Nonstandard	Compatible footprint
Size (L x W)	12.00mm x 12.00mm	12.50mm x 12.50mm	Minimal dimensional variance
Height (Max)	8.00mm	8.00mm	Equivalent
Operating Temperature	-40°C ~ 85°C	-40°C ~ 125°C	Substitute provides extended range
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity	MSL 1 (Unlimited)	MSL 1 (Unlimited)	Equivalent

Engineering Selection Recommendations

The SRF1280-151M from Bourns Inc. is qualified as a direct substitute for the 49151C based on electrical parameter equivalence in parallel configuration and mechanical compatibility. Both components maintain Active product status with full RoHS3 compliance and identical moisture sensitivity ratings. The substitute component delivers superior electrical performance with 1.59 A parallel current rating versus the 1.15 A requirement and reduced DC resistance of 261mOhm versus 529mOhm maximum. The extended operating temperature range of -40°C ~ 125°C provides additional thermal margin compared to the 49151C specification of -40°C ~ 85°C. Physical dimensions show minimal variance (12.50mm x 12.50mm versus 12.00mm x 12.00mm), with both components maintaining identical 8.00mm maximum seated height. PCB layout verification is required to confirm the 0.5mm dimensional increase does not conflict with adjacent component placement.

Frequently Asked Questions (FAQ)

Q: Can the SRF1280-151M be used as a direct replacement for the 49151C without circuit modification?

A: The SRF1280-151M is electrically compatible when configured in parallel mode, delivering the required 150 µH inductance and exceeding current and DC resistance specifications. Physical footprint dimensions require verification; the substitute is 0.5mm larger in length and width. No circuit modification is necessary if PCB layout accommodates the dimensional variance.

Q: What is the significance of the SRF1280-151M being a 2-coil inductor array?

A: The SRF1280-151M contains two coils that can be connected in parallel (150 µH, 1.59 A) or series (600 µH, 796 mA). For substitution of the 49151C, the parallel configuration is used, which matches the required 150 µH inductance value and provides the necessary current rating.

Q: Are there any compliance or certification differences between these components?

A: Both components are RoHS3 compliant, REACH unaffected, and carry identical moisture sensitivity level 1 (unlimited) ratings. No compliance barriers exist for substitution.

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

A: The SRF1280-151M parallel configuration provides 261mOhm maximum DC resistance compared to the 49151C specification of 529mOhm maximum. Lower DC resistance reduces power dissipation and heat generation in the inductor, improving overall circuit efficiency.

Q: What is the impact of the extended operating temperature range on the SRF1280-151M?

A: The SRF1280-151M operates across -40°C ~ 125°C versus the 49151C range of -40°C ~ 85°C. This extended upper temperature limit provides additional thermal margin and may be beneficial in high-temperature applications, though it does not affect substitution validity for standard operating conditions.

Q: Are there any packaging or handling differences?

A: Both components are supplied in Tape & Reel (TR) packaging with identical moisture sensitivity level 1 (unlimited), requiring no special handling modifications during assembly or storage.

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