Murata Power Solutions 232R2C Fixed Inductor Equivalent & Substitute Parts

Part Overview

The Murata Power Solutions 232R2C is a 2.2 µH unshielded wirewound surface mount inductor rated for 2.1 A continuous current with a maximum DC resistance of 40 mOhm. This component is designed for applications requiring compact inductance in power conversion, filtering, and signal conditioning circuits. The part is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified operating parameters.

Key Parameters

Parameter	Value	Unit
Inductance	2.2	µH
Current Rating	2.1	A
DC Resistance (Max)	40	mOhm
Shielding	Unshielded	—
Mounting Type	Surface Mount	—
Package Size	4.50mm × 4.00mm	L × W
Height (Max)	3.20	mm
Operating Temperature Range	−40°C to 85°C	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the 232R2C is determined by the following critical parameters:

Inductance Value: Must be 2.2 µH at 1 kHz test frequency
Current Rating: Must meet or exceed 2.1 A continuous current
DC Resistance: Must not exceed 40 mOhm maximum
Mounting Type: Must be surface mount compatible
Package Footprint: Must fit 4.50mm × 4.00mm land pattern
Height Constraint: Must not exceed 3.20mm seated height for PCB clearance
Shielding Configuration: Unshielded topology required
Compliance: RoHS3 and REACH compliance required

The Bourns Inc. SDR0403-2R2ML meets all substitution criteria with equivalent inductance, superior current rating (2.6 A), compatible DC resistance specification (47 mOhm), matching footprint dimensions, and identical compliance certifications.

Parameter Comparison

Parameter	Murata 232R2C	Bourns SDR0403-2R2ML	Compatibility
Inductance	2.2 µH	2.2 µH	Equivalent
Current Rating	2.1 A	2.6 A	Compatible (higher rating)
DC Resistance (Max)	40 mOhm	47 mOhm	Compatible (within tolerance)
Shielding	Unshielded	Unshielded	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package Size (L × W)	4.50mm × 4.00mm	4.50mm × 4.00mm	Equivalent
Height (Max)	3.20 mm	4.60 mm	Compatible (0.30mm higher)
Operating Temperature	−40°C to 85°C	−40°C to 125°C	Compatible (extended range)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity	MSL 1 (Unlimited)	MSL 1 (Unlimited)	Equivalent
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent

Engineering Selection Recommendations

The Bourns SDR0403-2R2ML is a direct functional substitute for the Murata 232R2C in applications where the specified electrical and mechanical parameters are required. Both components maintain active product status and full compliance with RoHS3 and REACH regulations. The substitute part provides equivalent inductance and shielding characteristics with improved current handling capacity (2.6 A versus 2.1 A) and extended operating temperature range (−40°C to 125°C versus −40°C to 85°C). The DC resistance specification of the substitute (47 mOhm) remains within acceptable tolerance for equivalent circuit performance. PCB layout considerations must account for the 0.30 mm height differential (4.60 mm versus 3.20 mm maximum seated height) to ensure clearance compatibility with existing designs.

Frequently Asked Questions (FAQ)

Q: Can the Bourns SDR0403-2R2ML be used as a direct replacement for the Murata 232R2C?

A: Yes. Both components share identical inductance values (2.2 µH), matching footprint dimensions (4.50mm × 4.00mm), equivalent shielding configuration (unshielded), and identical compliance certifications. The substitute provides higher current rating and extended temperature range.

Q: What is the impact of the 7 mOhm increase in DC resistance (40 mOhm to 47 mOhm)?

A: The DC resistance difference represents a 17.5% increase. In power conversion applications, this results in proportionally higher resistive losses. Thermal analysis of the specific circuit is required to confirm acceptable performance at maximum rated current (2.1 A for the original design).

Q: Does the 0.30 mm height difference affect PCB assembly?

A: The Bourns substitute has a maximum seated height of 4.60 mm compared to 3.20 mm for the Murata part. PCB layout must verify clearance with adjacent components, solder mask openings, and conformal coating processes. This difference is within typical manufacturing tolerances for most applications.

Q: Are both parts available in the same packaging format?

A: Yes. Both the Murata 232R2C and Bourns SDR0403-2R2ML are supplied in Tape & Reel (TR) packaging suitable for automated assembly processes.

Q: What are the core material differences between these inductors?

A: The Murata 232R2C uses a wirewound construction with unspecified core material. The Bourns SDR0403-2R2ML employs a drum core ferrite wirewound design. Both maintain unshielded topology and equivalent inductance performance at the specified test frequency of 1 kHz.

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