Murata 243R3C Equivalent & Substitute Parts

Part Overview

The Murata 243R3C is a 3.3 µH unshielded wirewound inductor rated for 2.4 A continuous current with a maximum DC resistance of 42mOhm. This surface mount component operates across the -40°C to 85°C temperature range and is designed for applications requiring compact, high-current inductance in nonstandard packaging. The part maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified when equivalent inductance values, current ratings, and thermal operating ranges align within acceptable engineering tolerances for the intended application.

Substiute Parts

243R3C

Murata Power Solutions Inc.In Stock: 854243R3C Datasheet

Current PartRFQ

SDR0604-3R3ML

Bourns Inc.In Stock: 6213SDR0604-3R3ML Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Murata 243R3C is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 3.3 µH (exact match required)
• Shielding configuration: Unshielded
• Mounting type: Surface Mount
• Package classification: Nonstandard

Secondary Compatibility Factors:

• Current rating: Minimum 2.0 A (substitute must support the application's current demand)
• DC resistance: Maximum 70mOhm (acceptable variance from 42mOhm baseline)
• Operating temperature range: Minimum -40°C to 85°C coverage
• Regulatory compliance: RoHS3 and REACH status alignment

The Bourns SDR0604-3R3ML qualifies as a direct substitute based on matching inductance (3.3 µH), unshielded configuration, surface mount design, and nonstandard packaging. While the substitute exhibits a 2.0 A current rating (below the main part's 2.4 A specification) and higher DCR (70mOhm vs. 42mOhm), these parameters remain within acceptable engineering tolerances for applications where the actual operating current does not exceed 2.0 A.

Parameter Comparison

Engineering Selection Recommendations

Both the Murata 243R3C and Bourns SDR0604-3R3ML maintain Active product status with full RoHS3 compliance and REACH unaffected designation. Selection between these components depends on application-specific current requirements:

The Murata 243R3C is the primary choice for applications requiring the full 2.4 A current rating and lower DC resistance (42mOhm), minimizing power dissipation in high-current circuits.

The Bourns SDR0604-3R3ML serves as a substitute for applications where operating current remains at or below 2.0 A. The extended operating temperature range (-40°C to 125°C) provides additional thermal margin in temperature-sensitive environments. The higher DCR (70mOhm) results in increased power dissipation and should be evaluated against thermal design constraints.

Both components are packaged in nonstandard surface mount configurations with identical moisture sensitivity ratings, ensuring equivalent handling and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can the Bourns SDR0604-3R3ML replace the Murata 243R3C in all applications?

A: Substitution is valid only when the circuit's actual operating current does not exceed 2.0 A. The Murata part's 2.4 A rating and lower DCR make it the preferred choice for higher-current applications. If your design operates below 2.0 A, the Bourns substitute is electrically compatible.

Q: What is the impact of the higher DC resistance in the Bourns part?

A: The Bourns SDR0604-3R3ML exhibits 70mOhm DCR compared to the Murata's 42mOhm. At 2.0 A, this results in approximately 0.28 W additional power dissipation (I²R loss). Thermal design must account for this increased dissipation.

Q: Are the package dimensions compatible?

A: Both components use nonstandard surface mount packaging. The Murata measures 5.80mm L × 5.20mm W × 4.50mm H (seated), while the Bourns measures 5.80mm L × 5.80mm W × 4.80mm H (seated). Verify PCB layout and clearance requirements before substitution.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both the Murata 243R3C and Bourns SDR0604-3R3ML are RoHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited) moisture sensitivity ratings. Regulatory compliance is equivalent.

Q: What is the difference in self-resonant frequency?

A: The Murata part exhibits 53MHz self-resonant frequency, while the Bourns part reaches 60MHz. This difference may affect high-frequency circuit behavior. Evaluate impedance characteristics if the application operates near these frequencies.