Equivalent & Substitute Parts for 26S4R7C

Part Overview

The 26S4R7C is a 4.7 µH shielded wirewound inductor manufactured by Murata Power Solutions Inc., rated for 3.8 A continuous current with a maximum DC resistance of 38mOhm. This component is designed for surface mount applications in the 2600 series and maintains active product status with full RoHS3 compliance. Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter tolerances while maintaining mechanical compatibility and regulatory compliance.

Key Parameters

Parameter	Value	Unit
Inductance	4.7	µH
Current Rating	3.8	A
DC Resistance (Max)	38	mOhm
Shielding	Shielded	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-40°C to 85°C	—
Frequency - Self Resonant	38	MHz
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

The SRR1240-4R7M from Bourns Inc. qualifies as a substitute for the 26S4R7C based on the following alignment of critical electrical parameters:

Inductance Match: Both parts specify 4.7 µH, meeting the primary functional requirement
Shielding Compatibility: Both are shielded designs, maintaining electromagnetic isolation properties
Surface Mount Configuration: Both utilize surface mount technology with nonstandard package dimensions
Regulatory Compliance: Both achieve ROHS3 compliance and carry MSL 1 (Unlimited) moisture sensitivity ratings
Current Capability: The SRR1240-4R7M is rated for 6 A, exceeding the 26S4R7C requirement of 3.8 A, providing design margin
DC Resistance Performance: The SRR1240-4R7M specifies 18mOhm maximum, which is lower than the 26S4R7C at 38mOhm maximum, resulting in improved efficiency characteristics

Substitution is valid when the application circuit can accommodate the physical dimension differences and the extended operating temperature range of the substitute part.

Parameter Comparison

Parameter	26S4R7C (Murata)	SRR1240-4R7M (Bourns)	Notes
Inductance	4.7 µH	4.7 µH	Exact match
Current Rating	3.8 A	6 A	Substitute rated higher
DC Resistance (Max)	38 mOhm	18 mOhm	Substitute has lower resistance
Shielding	Shielded	Shielded	Equivalent
Frequency - Self Resonant	38 MHz	33 MHz	Within acceptable range
Operating Temperature Range	-40°C to 85°C	-40°C to 125°C	Substitute has extended range
Mounting Type	Surface Mount	Surface Mount	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Equivalent
Size / Dimension	12.60mm L x 4.60mm W	12.50mm L x 12.50mm W	Different footprint
Height - Seated (Max)	5.90 mm	4.50 mm	Substitute is lower profile

Engineering Selection Recommendations

Selection between the 26S4R7C and SRR1240-4R7M should be based on the following criteria:

Use 26S4R7C when:

PCB layout is constrained to the original footprint dimensions (12.60mm L x 4.60mm W)
The narrower profile (4.60mm width) is required for component density
Operating temperature does not exceed 85°C

Use SRR1240-4R7M when:

PCB layout can accommodate the square footprint (12.50mm x 12.50mm)
Lower DC resistance (18mOhm vs 38mOhm) provides thermal or efficiency benefits
Operating temperature may reach or exceed 85°C up to 125°C
Higher current margin (6 A vs 3.8 A) is beneficial for circuit reliability
Lower profile height (4.50mm vs 5.90mm) is advantageous for space-constrained applications

Both parts maintain active product status, full RoHS3 compliance, and unlimited moisture sensitivity ratings, ensuring regulatory and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the SRR1240-4R7M directly replace the 26S4R7C without circuit modification?

A: Electrical substitution is valid due to matching inductance (4.7 µH) and shielding characteristics. However, PCB layout modification is required due to different footprint dimensions. The SRR1240-4R7M has a square footprint (12.50mm x 12.50mm) compared to the rectangular footprint of the 26S4R7C (12.60mm L x 4.60mm W).

Q: What are the advantages of the SRR1240-4R7M over the 26S4R7C?

A: The SRR1240-4R7M offers three key advantages: lower DC resistance (18mOhm vs 38mOhm), higher current rating (6 A vs 3.8 A), and extended operating temperature range (-40°C to 125°C vs -40°C to 85°C). These characteristics result in improved thermal performance and design margin.

Q: Are there any disadvantages to using the SRR1240-4R7M?

A: The primary consideration is the larger footprint area due to the square geometry (12.50mm x 12.50mm). This may impact PCB layout in space-constrained designs. The self-resonant frequency is also slightly lower (33 MHz vs 38 MHz), which may be relevant in high-frequency applications.

Q: Do both parts have the same moisture sensitivity and RoHS compliance?

A: Yes. Both the 26S4R7C and SRR1240-4R7M are rated MSL 1 (Unlimited) and are ROHS3 compliant, ensuring equivalent handling and regulatory requirements.

Q: What is the impact of the different DC resistance values on circuit performance?

A: Lower DC resistance reduces I²R losses and heat generation. The SRR1240-4R7M at 18mOhm maximum will dissipate less power than the 26S4R7C at 38mOhm maximum when carrying the same current, resulting in improved efficiency and reduced thermal stress on the component and surrounding circuitry.

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