SCMS5D20-3R3 Equivalent & Substitute Parts

Part Overview

The SCMS5D20-3R3 is a 3.3 µH shielded surface mount inductor manufactured by Signal Transformer, rated for 2.2 A continuous current with 60mOhm maximum DC resistance. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates across the industrial temperature range of -40°C to 125°C and meets ROHS3 compliance standards.

Substiute Parts

SCMS5D20-3R3

Signal TransformerIn Stock: 1233SCMS5D20-3R3 Datasheet

Current PartRFQ

LMLP05B5N3R3CTAR

KYOCERA AVXIn Stock: 1164LMLP05B5N3R3CTAR Datasheet

MFR RecommendedRFQ

SD53-3R3-R

Eaton - Electronics DivisionIn Stock: 29160SD53-3R3-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SCMS5D20-3R3 is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 3.3 µH (exact match required)
• Inductance tolerance: ±30% or tighter
• Current rating: minimum 2.2 A continuous
• Saturation current: minimum 1.47 A
• DC resistance: 60 mOhm or lower
• Shielding: Shielded configuration
• Operating temperature range: -40°C to 125°C minimum
• Mounting type: Surface Mount
• RoHS compliance: ROHS3 Compliant

Secondary Compatibility Factors:

• Physical footprint compatibility (5.20mm x 5.20mm base dimension)
• Moisture sensitivity level: MSL 1 or equivalent
• Test frequency: 100 kHz

The two substitute parts listed below meet all primary matching criteria and are therefore electrically and mechanically compatible with the SCMS5D20-3R3 in applications requiring this specific inductance and current rating.

Parameter Comparison

Engineering Selection Recommendations

LMLP05B5N3R3CTAR (KYOCERA AVX) is the manufacturer-recommended primary substitute. This part is in active production status, ensuring long-term availability and supply chain stability. It exceeds the original part specifications with 2.4 A current rating versus 2.2 A, improved saturation current of 2.4 A, and reduced DC resistance of 48 mOhm compared to 60 mOhm maximum. The KYOCERA AVX part maintains identical inductance tolerance (±30%), operating temperature range, and RoHS3 compliance. Physical dimensions are slightly smaller (5.00mm x 5.00mm x 2.00mm), which may require PCB layout verification for existing designs.

SD53-3R3-R (Eaton - Electronics Division) is the secondary substitute option. This part offers superior electrical performance with the lowest DC resistance at 34 mOhm maximum and highest saturation current at 2.6 A. The SD53 series features tighter inductance tolerance (±20% versus ±30%), providing better circuit performance predictability. Eaton's active product status guarantees availability. The increased height of 3.00mm versus the original 2.10mm requires clearance verification in space-constrained applications. The drum core, wirewound construction differs from the original design but maintains all electrical and thermal specifications.

Both substitutes are ROHS3 compliant with MSL 1 moisture sensitivity rating, matching the original part's environmental qualifications.

Frequently Asked Questions (FAQ)

Q: Can LMLP05B5N3R3CTAR be used as a direct replacement for SCMS5D20-3R3?

A: Yes. The LMLP05B5N3R3CTAR meets all electrical requirements: 3.3 µH inductance, 2.4 A current rating (exceeds 2.2 A requirement), 48 mOhm DCR (better than 60 mOhm maximum), and identical operating temperature range. PCB layout must accommodate the slightly smaller 5.00mm x 5.00mm footprint.

Q: What is the difference between the two substitute parts?

A: Both substitutes meet the SCMS5D20-3R3 specifications. The LMLP05B5N3R3CTAR offers a smaller footprint (5.00mm) with moderate performance improvement. The SD53-3R3-R provides superior electrical performance (34 mOhm DCR, ±20% tolerance) but requires additional height clearance (3.00mm versus 2.10mm) and uses drum core wirewound construction.

Q: Are there any compliance differences between the original and substitute parts?

A: No. All three parts are ROHS3 compliant, REACH unaffected, classified as EAR99, and carry MSL 1 moisture sensitivity rating. Operating temperature ranges are identical (-40°C to 125°C).

Q: Which substitute should be selected for new designs?

A: LMLP05B5N3R3CTAR is recommended for new designs due to active production status, improved electrical performance, and minimal footprint adjustment. SD53-3R3-R is suitable when superior DC resistance performance is required and height constraints permit the 3.00mm seated height.

Q: Can the substitutes be used interchangeably in existing PCB designs?

A: Electrical interchangeability is confirmed. Physical interchangeability requires PCB layout verification: LMLP05B5N3R3CTAR has a smaller footprint (5.00mm), and SD53-3R3-R has greater height (3.00mm). Pad patterns and clearances must be evaluated for each design.

Q: What is the saturation current significance for this application?

A: Saturation current defines the maximum current before inductor core saturation causes inductance degradation. The original part saturates at 1.47 A. Both substitutes exceed this threshold (2.4 A and 2.6 A respectively), providing improved headroom and performance stability under transient conditions.