SCMS5D12-4R7 Equivalent & Substitute Parts

Part Overview

The SCMS5D12-4R7 is a 4.7 µH shielded inductor manufactured by Signal Transformer, rated for 1.37 A continuous current with a maximum DC resistance of 129mOhm. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. The part is surface-mounted in a nonstandard 5.20mm × 5.20mm package with ROHS3 compliance and unlimited moisture sensitivity rating.

Key Parameters

Parameter	Value
Inductance	4.7 µH
Inductance Tolerance	±30%
Current Rating	1.37 A
Saturation Current (Isat)	1 A
DC Resistance (DCR)	129 mOhm Max
Shielding	Shielded
Operating Temperature Range	-40°C to 125°C
Mounting Type	Surface Mount
Package Dimensions	5.20mm L × 5.20mm W × 1.25mm H
Product Status	Obsolete
RoHS Compliance	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the SCMS5D12-4R7 is determined by the following critical parameters:

Inductance Value: Must be 4.7 µH with tolerance sufficient to maintain circuit performance within the original design margin
Current Rating: Substitute must support minimum 1.37 A continuous current
Saturation Current: Must meet or exceed 1 A minimum threshold
DC Resistance: Lower DCR values are acceptable; higher values may impact thermal performance
Shielding: Shielded construction required to maintain electromagnetic compatibility
Package Footprint: Surface mount in 5.20mm × 5.20mm form factor with compatible height
Operating Temperature: Must support -40°C to 125°C range or equivalent
Compliance: RoHS and REACH compliance required for modern procurement standards

The SD12-4R7-R from Eaton - Electronics Division meets these substitution criteria with improved electrical performance characteristics.

Parameter Comparison

Parameter	SCMS5D12-4R7 (Signal Transformer)	SD12-4R7-R (Eaton)	Compatibility
Inductance	4.7 µH	4.7 µH	Matched
Inductance Tolerance	±30%	±20%	Substitute tighter
Current Rating (Amps)	1.37 A	1.46 A	Substitute higher
Saturation Current (Isat)	1 A	1.29 A	Substitute higher
DC Resistance (DCR)	129 mOhm Max	117.7 mOhm	Substitute lower
Shielding	Shielded	Shielded	Matched
Operating Temperature	-40°C to 125°C	-40°C to 85°C	Substitute narrower
Mounting Type	Surface Mount	Surface Mount	Matched
Package Dimensions	5.20mm L × 5.20mm W	5.20mm L × 5.20mm W	Matched
Height	1.25mm Max	1.20mm Max	Substitute lower
Product Status	Obsolete	Active	Substitute active
RoHS Compliance	ROHS3 Compliant	RoHS Compliant	Both compliant

Engineering Selection Recommendations

The SD12-4R7-R is a direct functional substitute for the obsolete SCMS5D12-4R7. The substitute part demonstrates superior electrical performance with higher current rating (1.46 A vs. 1.37 A), improved saturation current (1.29 A vs. 1 A), and reduced DC resistance (117.7 mOhm vs. 129 mOhm). The tighter inductance tolerance (±20% vs. ±30%) provides enhanced circuit stability.

The primary design consideration is the reduced upper operating temperature limit of the substitute (85°C vs. 125°C). Applications requiring sustained operation above 85°C ambient or with thermal margins approaching 125°C must evaluate thermal performance independently. The substitute maintains identical footprint dimensions and is available in active production status with standard tape and reel packaging, supporting modern supply chain requirements.

Both parts maintain full RoHS compliance and unlimited moisture sensitivity rating, ensuring compatibility with current manufacturing and environmental standards.

Frequently Asked Questions (FAQ)

Q: Can the SD12-4R7-R replace the SCMS5D12-4R7 in all applications?

A: The SD12-4R7-R is functionally equivalent for applications operating within -40°C to 85°C. Applications requiring operation above 85°C ambient temperature must independently verify thermal performance against original design specifications.

Q: What is the impact of the lower DC resistance in the substitute part?

A: Lower DC resistance (117.7 mOhm vs. 129 mOhm) reduces resistive losses and heat generation, improving overall circuit efficiency. This is a beneficial characteristic that does not compromise compatibility.

Q: Are the package dimensions identical?

A: Yes. Both parts use identical 5.20mm × 5.20mm surface mount footprints. The SD12-4R7-R has a slightly lower seated height (1.20mm vs. 1.25mm), which is compatible with standard PCB assembly processes.

Q: What is the significance of the tighter inductance tolerance in the substitute?

A: The SD12-4R7-R tolerance of ±20% is tighter than the original ±30%, providing improved consistency in inductance value across production batches. This enhances circuit performance predictability without introducing compatibility issues.

Q: Is the substitute part available in the same packaging format?

A: The SD12-4R7-R is supplied in tape and reel (TR) format, which is standard for modern surface mount assembly. The original SCMS5D12-4R7 packaging format is not specified in available data.

Q: Do both parts meet current compliance requirements?

A: Yes. Both parts are RoHS compliant and carry unlimited moisture sensitivity rating (MSL 1), meeting current procurement and manufacturing standards.

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