242R7C Equivalent & Substitute Parts

Part Overview

The 242R7C is a 2.7 µH unshielded wirewound inductor manufactured by Murata Power Solutions Inc., designed for surface mount applications with a current rating of 2.6 A and maximum DC resistance of 39mOhm. This component is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent inductance values, compatible current ratings, and matching package form factors are available from alternative manufacturers, enabling procurement flexibility and supply chain continuity.

Key Parameters

Parameter	Value
Inductance	2.7 µH
Current Rating	2.6 A
DC Resistance (DCR)	39mOhm Max
Shielding	Unshielded
Mounting Type	Surface Mount
Operating Temperature Range	-40°C ~ 85°C
Frequency - Self Resonant	57 MHz
Package Type	Nonstandard
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 242R7C is determined by the following critical parameters:

Primary Matching Criteria:

Inductance value: 2.7 µH (exact match required)
Mounting type: Surface Mount (identical package form factor)
Shielding configuration: Unshielded (electromagnetic isolation characteristics)
Package classification: Nonstandard (physical dimensions and footprint compatibility)

Secondary Compatibility Parameters:

Current rating: Minimum 2.3 A (substitute must support primary application current demands)
DC resistance: Maximum 60mOhm (acceptable variance for thermal and efficiency performance)
Operating temperature range: Minimum -40°C ~ 125°C (covers or exceeds primary part range)
RoHS3 compliance: Required for regulatory alignment

The SDR0604-2R7ML from Bourns Inc. meets all primary and secondary criteria, establishing direct substitution eligibility.

Parameter Comparison

Parameter	242R7C (Murata)	SDR0604-2R7ML (Bourns)	Compatibility Notes
Inductance	2.7 µH	2.7 µH	Exact match
Current Rating (Amps)	2.6 A	2.3 A	Substitute rated 88% of primary; acceptable for most applications
DC Resistance (DCR)	39mOhm Max	60mOhm Max	Substitute 54% higher; verify thermal performance in high-current circuits
Shielding	Unshielded	Unshielded	Identical electromagnetic profile
Operating Temperature	-40°C ~ 85°C	-40°C ~ 125°C	Substitute provides extended upper temperature range
Frequency - Self Resonant	57 MHz	65 MHz	Substitute 14% higher; suitable for broadband applications
Mounting Type	Surface Mount	Surface Mount	Identical mounting configuration
Package / Case	Nonstandard	Nonstandard	Physical dimensions compatible: 5.80mm L x 5.20mm W vs 5.80mm L x 5.80mm W
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Both meet regulatory requirements

Engineering Selection Recommendations

Primary Part (242R7C - Murata Power Solutions Inc.): Select when lowest DC resistance is critical for thermal management or when the -40°C ~ 85°C operating range is sufficient. Active product status ensures continued availability and manufacturing support.

Substitute Part (SDR0604-2R7ML - Bourns Inc.): Select when extended operating temperature range (-40°C ~ 125°C) is required or when supply constraints affect primary part availability. Active product status confirms ongoing production. The 60mOhm maximum DCR is acceptable in applications where current remains below 2.3 A continuous rating. Both parts maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Frequently Asked Questions (FAQ)

Q: Can SDR0604-2R7ML directly replace 242R7C in all applications? A: Direct replacement is valid when circuit current does not exceed 2.3 A continuous. The higher DC resistance (60mOhm vs 39mOhm) generates additional heat; verify thermal performance in high-current designs operating near the 2.3 A limit.

Q: What is the impact of the 21mOhm DCR difference? A: At 2.3 A, the SDR0604-2R7ML dissipates approximately 0.318 W compared to 0.207 W for the 242R7C. This 54% increase in resistive loss must be evaluated against thermal design margins in the target application.

Q: Are the physical dimensions compatible? A: Both components use nonstandard surface mount packages with identical length (5.80mm). The substitute is 0.60mm wider (5.80mm vs 5.20mm) and 0.30mm taller (4.80mm vs 4.50mm). Verify PCB layout and clearance before substitution.

Q: Which part should be selected for new designs? A: For new designs, either part is acceptable based on application requirements. The 242R7C offers lower losses; the SDR0604-2R7ML provides extended temperature range. Both are Active status with full compliance certifications.

Q: Is tolerance specification a substitution factor? A: The 242R7C tolerance is not specified in available data. The SDR0604-2R7ML specifies ±20% tolerance. If tolerance is critical, confirm 242R7C specifications with Murata before substitution.

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