SCMS5D12-2R2 Equivalent & Substitute Parts

Part Overview

The SCMS5D12-2R2 is a 2.2 µH shielded inductor manufactured by Signal Transformer, rated for 1.7 A continuous current with a maximum DC resistance of 82 mOhm. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The part operates across the industrial temperature range of -40°C to 125°C and is mounted as a surface mount device in a nonstandard 5.20mm × 5.20mm package footprint.

Key Parameters

Parameter	Value
Inductance	2.2 µH
Inductance Tolerance	±30%
Current Rating	1.7 A
Saturation Current (Isat)	1.6 A
DC Resistance (DCR)	82 mOhm Max
Shielding	Shielded
Operating Temperature Range	-40°C to 125°C
Mounting Type	Surface Mount
Package Footprint	5.20mm × 5.20mm
Height (Seated Max)	1.25 mm
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SCMS5D12-2R2 is determined by strict equivalence in the following electrical and mechanical parameters:

Critical Matching Parameters:

Inductance value: 2.2 µH (tolerance variance acceptable within design margin)
Current rating: minimum 1.7 A continuous
Saturation current: minimum 1.6 A
DC resistance: must not exceed 82 mOhm to maintain circuit performance
Shielding: shielded construction required
Mounting: surface mount only
Package footprint: 5.20mm × 5.20mm compatible
Height: maximum 1.25 mm seated height

The substitute part SD12-2R2-R from Eaton - Electronics Division meets all critical electrical parameters with improved specifications in current rating (1.83 A), saturation current (1.8 A), and reduced DC resistance (74.7 mOhm). The identical footprint and compatible height ensure mechanical interchangeability on existing PCB layouts.

Parameter Comparison

Parameter	SCMS5D12-2R2 (Signal Transformer)	SD12-2R2-R (Eaton)	Match Status
Inductance	2.2 µH	2.2 µH	Exact Match
Inductance Tolerance	±30%	±20%	Substitute Tighter
Current Rating (Amps)	1.7 A	1.83 A	Substitute Higher
Saturation Current (Isat)	1.6 A	1.8 A	Substitute Higher
DC Resistance (DCR)	82 mOhm Max	74.7 mOhm	Substitute Lower
Shielding	Shielded	Shielded	Exact Match
Operating Temperature Range	-40°C to 125°C	-40°C to 85°C	Substitute Narrower
Mounting Type	Surface Mount	Surface Mount	Exact Match
Package Footprint	5.20mm × 5.20mm	5.20mm × 5.20mm	Exact Match
Height (Seated Max)	1.25 mm	1.20 mm	Substitute Lower
RoHS Status	ROHS3 Compliant	RoHS Compliant	Both Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Exact Match

Engineering Selection Recommendations

The SD12-2R2-R from Eaton - Electronics Division is a direct substitute for the obsolete SCMS5D12-2R2. The substitute part provides superior electrical performance with higher current and saturation ratings, lower DC resistance, and tighter inductance tolerance. Both parts maintain identical moisture sensitivity classification and footprint compatibility.

The primary design consideration is the operating temperature range. The original part supports -40°C to 125°C operation, while the substitute operates to 85°C maximum. Applications requiring operation above 85°C must evaluate thermal requirements against the substitute's upper temperature limit. For applications within the -40°C to 85°C range, the SD12-2R2-R is fully qualified as a replacement.

Both parts carry current regulatory compliance: the original is ROHS3 compliant, and the substitute is RoHS compliant. The substitute's drum core, wirewound construction with ferrite core material provides the shielded performance required for EMI-sensitive applications.

Frequently Asked Questions (FAQ)

Q: Can the SD12-2R2-R be used as a direct replacement on existing PCBs designed for the SCMS5D12-2R2?

A: Yes. Both parts share identical footprint dimensions (5.20mm × 5.20mm) and compatible seated heights (1.25 mm vs. 1.20 mm). The substitute's lower profile presents no clearance issues. No PCB layout modifications are required.

Q: What is the impact of the substitute's lower DC resistance (74.7 mOhm vs. 82 mOhm)?

A: Lower DC resistance reduces resistive losses in the inductor, resulting in improved efficiency and reduced heat generation. This is a beneficial characteristic for circuit performance.

Q: Does the tighter inductance tolerance (±20% vs. ±30%) affect circuit compatibility?

A: Tighter tolerance improves circuit predictability and reduces performance variation across production batches. This is advantageous for applications with tight frequency or impedance requirements.

Q: What is the significance of the narrower operating temperature range for the substitute?

A: The substitute operates from -40°C to 85°C, compared to the original's -40°C to 125°C range. Applications requiring continuous operation above 85°C must use the original part or identify an alternative rated to higher temperatures. Most commercial and industrial applications operate within the substitute's temperature range.

Q: Are both parts available in the same packaging format?

A: The original SCMS5D12-2R2 uses nonstandard packaging. The substitute SD12-2R2-R is supplied in Tape & Reel (TR) format, which is standard for surface mount production. This packaging format is compatible with automated assembly equipment.

Q: What core material differences exist between these parts?

A: The original part does not specify core material. The substitute uses a ferrite core with drum core, wirewound construction. Ferrite cores provide effective shielding and are standard for this inductance and current rating class.

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