SPD127R-473M Equivalent and Substitute Parts

Part Overview

The SPD127R-473M is a 47 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., designed for surface mount applications with a current rating of 2.5 A and maximum DC resistance of 100mOhm. The component is RoHS3 compliant and rated for operating temperatures from -55°C to 125°C. This part is classified as Active status. Equivalent and substitute parts are identified to provide design flexibility and supply chain alternatives when the primary part becomes unavailable or when design requirements permit selection of functionally compatible alternatives.

Substiute Parts

SPD127R-473M

API Delevan Inc.In Stock: 825SPD127R-473M Datasheet

Current PartRFQ

SCRH127-470

Signal TransformerIn Stock: 2265SCRH127-470 Datasheet

SimilarRFQ

SRR1208-470YL

Bourns Inc.In Stock: 1528SRR1208-470YL Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SPD127R-473M are identified based on electrical and mechanical compatibility within the following parameters:

Electrical Compatibility Criteria:

• Inductance value: 47 µH (exact match required)
• Shielding: Shielded configuration
• Current rating: minimum 2.2 A (allows parts rated at or above the original 2.5 A specification)
• DC resistance: 100mOhm or lower (maintains power dissipation performance)
• Mounting type: Surface Mount
• Inductance tolerance: ±20% or better (tighter tolerance acceptable)

Mechanical Compatibility Criteria:

• Package case: Nonstandard form factor
• Surface mount footprint compatibility
• Height restrictions within PCB assembly constraints

Compliance and Environmental Criteria:

• RoHS3 Compliant
• Moisture Sensitivity Level 1
• Operating temperature range: -40°C minimum (original part rated to -55°C; substitute range acceptable if application does not require extended low-temperature operation)

The identified substitutes (SCRH127-470 and SRR1208-470YL) meet the electrical and mechanical parameters required for functional equivalence while providing supply chain alternatives.

Parameter Comparison

Engineering Selection Recommendations

All three parts—SPD127R-473M, SCRH127-470, and SRR1208-470YL—maintain Active product status and full RoHS3 compliance. Selection among these parts should be based on the following engineering considerations:

SPD127R-473M (Primary Part): Preferred when the extended operating temperature range of -55°C to 125°C is required. Smallest footprint (12.00mm x 12.00mm) and lowest seated height (8.00mm) support space-constrained designs.

SCRH127-470 (Substitute): Suitable for applications within the -40°C to 125°C operating temperature range. Marginally larger footprint (12.50mm x 12.50mm) with equivalent seated height (8.00mm). Highest current rating (2.62 A) provides additional headroom for current-limited applications.

SRR1208-470YL (Substitute): Appropriate for applications within the -40°C to 125°C operating temperature range. Tighter inductance tolerance (±15% vs ±20%) and lower DC resistance (85mOhm vs 100mOhm) provide improved electrical performance characteristics. Larger footprint (12.70mm x 12.70mm) and increased seated height (8.50mm) require PCB layout verification. Highest saturation current (3.1A) supports higher transient current applications.

Frequently Asked Questions (FAQ)

Q: Can the SCRH127-470 replace the SPD127R-473M in all applications?

A: The SCRH127-470 is electrically compatible for applications operating within -40°C to 125°C. The primary constraint is the upper low-temperature limit; if the application requires operation below -40°C, the SPD127R-473M with its -55°C minimum rating is required. Mechanical fit must be verified due to the slightly larger footprint (12.50mm vs 12.00mm).

Q: What are the implications of the different DC resistance values across these parts?

A: The SPD127R-473M and SCRH127-470 both specify 100mOhm maximum DC resistance, while the SRR1208-470YL specifies 85mOhm maximum. Lower DC resistance results in reduced resistive heating and improved efficiency in high-current or high-frequency switching applications. The SRR1208-470YL provides superior thermal performance at rated current.

Q: Are there PCB layout considerations when switching between these parts?

A: Yes. The SPD127R-473M occupies 12.00mm x 12.00mm with 8.00mm seated height. The SCRH127-470 requires 12.50mm x 12.50mm footprint. The SRR1208-470YL requires the largest footprint at 12.70mm x 12.70mm with 8.50mm height. PCB land pattern and clearance verification is mandatory before design substitution.

Q: Do tolerance differences affect circuit performance?

A: The SRR1208-470YL offers ±15% tolerance compared to ±20% for the other parts. Tighter tolerance improves predictability in precision filtering or impedance matching circuits. Applications with inductance-dependent performance should evaluate whether the improved tolerance provides functional benefits.

Q: What is the saturation current significance for these inductors?

A: Saturation current (Isat) represents the current level at which inductor performance begins to degrade. The SPD127R-473M and SCRH127-470 saturate at 2.5A, while the SRR1208-470YL saturates at 3.1A. Applications experiencing transient current spikes above the saturation point experience inductance collapse and reduced filtering effectiveness.

Q: Are all three parts qualified to the same compliance standards?

A: All three parts maintain RoHS3 compliance, REACH Unaffected status, and Moisture Sensitivity Level 1 (Unlimited). Packaging is Tape & Reel (TR) for all three parts. Regulatory and environmental qualification is equivalent across all options.