SD12-R47-R Equivalent & Substitute Parts

Part Overview

The SD12-R47-R is a 470 nH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 3.19 A continuous current with a DC resistance of 24.6 mOhm and operates across the temperature range of -40°C to 85°C. The part is RoHS Compliant and carries an MSL rating of 1 (Unlimited), indicating minimal moisture sensitivity. The SD12-R47-R maintains Active product status with 11,600 pieces currently in stock.

Equivalent and substitute parts are identified to address supply chain continuity, inventory availability, or specific application requirements where alternative electrical or mechanical characteristics fall within acceptable operating parameters.

Key Parameters

Parameter	Value	Unit	Significance for Substitution
Inductance	470	nH	Core electrical specification; must match exactly
Current Rating	3.19	A	Continuous current capacity; substitute must meet or exceed
DC Resistance (DCR)	24.6	mOhm	Power loss and thermal characteristics; lower is preferred
Saturation Current (Isat)	3.86	A	Maximum current before inductance degradation; substitute must meet or exceed
Operating Temperature Range	-40 to 85	°C	Environmental operating limits; substitute must cover or exceed
Shielding	Shielded	—	EMI containment; must be maintained
Mounting Type	Surface Mount	—	PCB assembly compatibility; must remain surface mount
Package Type	Nonstandard	—	Physical footprint; substitute must fit within board layout constraints
RoHS Status	RoHS Compliant	—	Regulatory compliance requirement

Substitute Part Grouping Explanation

Substitute parts for the SD12-R47-R are identified based on strict electrical and mechanical compatibility criteria. The substitution logic is governed by the following parameters:

Inductance Value: The substitute must provide 470 nH inductance at the 100 kHz test frequency to maintain circuit performance.

Current Ratings: The substitute current rating must equal or exceed 3.19 A continuous current. The saturation current (Isat) must equal or exceed 3.86 A to prevent inductance collapse under peak load conditions.

DC Resistance: The substitute DCR should not significantly exceed the original 24.6 mOhm specification, as higher resistance increases power dissipation and thermal generation.

Shielding: The substitute must maintain shielded construction to preserve electromagnetic isolation and prevent coupling with adjacent circuit elements.

Mounting and Package: The substitute must be surface mount compatible. Physical dimensions must accommodate existing PCB footprints or be verified for layout compatibility.

Operating Temperature: The substitute operating temperature range must cover the application's thermal environment. Extended temperature ranges provide additional design margin.

Regulatory Compliance: The substitute must maintain RoHS compliance status and MSL rating appropriate for manufacturing and storage conditions.

Parameter Comparison

Parameter	SD12-R47-R (Eaton)	SRR4011-R47YL (Bourns)	Compatibility Notes
Inductance	470 nH	470 nH	Exact match at 100 kHz test frequency
Inductance Tolerance	±20%	±30%	Bourns part has wider tolerance; acceptable for most applications
Current Rating	3.19 A	3.2 A	Equivalent; Bourns part meets requirement
Saturation Current (Isat)	3.86 A	3.8 A	Bourns part slightly lower; acceptable for most designs
DC Resistance (DCR)	24.6 mOhm	30 mOhm Max	Bourns part higher; verify thermal impact in power-sensitive applications
Operating Temperature Range	-40 to 85°C	-40 to 125°C	Bourns part provides extended high-temperature capability
Shielding	Shielded	Shielded	Both parts maintain shielded construction
Mounting Type	Surface Mount	Surface Mount	Both parts are surface mount compatible
Package Type	Nonstandard	Nonstandard	Physical dimensions differ; verify PCB footprint compatibility
Size (L x W)	5.20 x 5.20 mm	4.80 x 4.80 mm	Bourns part is smaller; footprint adjustment may be required
Height (Max)	1.20 mm	1.30 mm	Bourns part slightly taller; verify clearance
RoHS Status	RoHS Compliant	ROHS3 Compliant	Both parts meet RoHS requirements
MSL Rating	1 (Unlimited)	1 (Unlimited)	Both parts have minimal moisture sensitivity
Q @ Frequency	Not specified	7 @ 25.2 MHz	Bourns part provides quality factor data
Self Resonant Frequency	Not specified	221 MHz	Bourns part provides SRF data for high-frequency applications

Engineering Selection Recommendations

Primary Selection (SD12-R47-R): The Eaton SD12-R47-R remains the preferred choice when supply is available. It provides the specified 24.6 mOhm DCR with tighter inductance tolerance (±20%), minimizing power dissipation and circuit performance variation. The part maintains Active product status with substantial inventory (11,600 pieces).

Substitute Selection (SRR4011-R47YL): The Bourns SRR4011-R47YL is electrically compatible as a substitute when the primary part is unavailable. The substitute meets all critical electrical parameters: 470 nH inductance, 3.2 A current rating, and 3.8 A saturation current. Both parts are RoHS Compliant with MSL 1 ratings.

Considerations for Substitution:

The Bourns part exhibits 30 mOhm maximum DCR compared to 24.6 mOhm for the Eaton part. This 22% increase in resistance results in proportionally higher power dissipation. In applications where thermal management is critical or where inductor losses directly impact efficiency, this difference must be evaluated against circuit requirements.

The Bourns part provides extended operating temperature capability (-40 to 125°C versus -40 to 85°C), offering additional thermal margin for high-temperature environments.

Physical dimensions differ: the Bourns part measures 4.80 x 4.80 mm with 1.30 mm height, compared to 5.20 x 5.20 mm with 1.20 mm height for the Eaton part. PCB layout verification is required to confirm footprint compatibility and clearance.

Both parts maintain shielded construction and surface mount compatibility, preserving electromagnetic isolation and assembly process compatibility.

Frequently Asked Questions (FAQ)

Q: Can the SRR4011-R47YL directly replace the SD12-R47-R without PCB modification?

A: Electrical substitution is valid. However, physical dimensions differ (4.80 x 4.80 mm versus 5.20 x 5.20 mm footprint). PCB layout verification is required to confirm the smaller Bourns part fits within the existing pad pattern or if rework is necessary. Height difference (1.30 mm versus 1.20 mm) must also be verified for clearance.

Q: What is the impact of the higher DCR (30 mOhm) in the Bourns substitute?

A: The 5.4 mOhm increase in DC resistance results in approximately 22% higher resistive losses at rated current. In a 3.19 A application, this translates to additional power dissipation of approximately 54 mW compared to the Eaton part. Thermal analysis is recommended for power-sensitive or thermally constrained designs.

Q: Are both parts suitable for the same operating temperature range?

A: The Eaton SD12-R47-R operates from -40 to 85°C. The Bourns SRR4011-R47YL extends to 125°C. If the application requires operation above 85°C, only the Bourns part is suitable. For applications within -40 to 85°C, both parts are acceptable.

Q: Do both parts meet current regulatory compliance requirements?

A: Yes. The Eaton part is RoHS Compliant. The Bourns part is ROHS3 Compliant, which represents an updated RoHS standard. Both parts carry MSL 1 (Unlimited) ratings, indicating minimal moisture sensitivity for manufacturing and storage.

Q: What is the inductance tolerance difference, and does it matter?

A: The Eaton part specifies ±20% tolerance; the Bourns part specifies ±30%. In circuits where inductance value directly affects frequency response, filtering characteristics, or impedance matching, the tighter Eaton tolerance provides better performance predictability. For general-purpose applications, the ±30% tolerance is typically acceptable.

Q: Can the Bourns part be used in high-frequency applications?

A: The Bourns SRR4011-R47YL provides self-resonant frequency (SRF) data of 221 MHz and quality factor (Q) of 7 at 25.2 MHz. These parameters indicate suitability for RF and high-frequency applications. The Eaton part does not provide SRF or Q data, limiting high-frequency application assessment.

Q: What inventory considerations apply to these parts?

A: The Eaton SD12-R47-R has 11,600 pieces in stock, providing immediate availability. The Bourns SRR4011-R47YL has 1,464 pieces available. For high-volume production, the Eaton part offers superior supply security. The Bourns part is suitable for lower-volume or prototype applications.

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