SPD74-103M Equivalent & Substitute Parts

Part Overview

The SPD74-103M is a 10 µH shielded drum core, wirewound inductor manufactured by API Delevan Inc., rated for 3.2 A continuous current with a maximum DC resistance of 49 mOhm. The part operates across a temperature range of -55°C to 125°C and is tested at 100 kHz. The product is currently classified as obsolete, making identification of functionally equivalent alternatives necessary for design continuity and procurement planning.

Substiute Parts

SPD74-103M

API Delevan Inc.In Stock: 1043SPD74-103M Datasheet

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HRSPD74-103M

API Delevan Inc.In Stock: 1037HRSPD74-103M Datasheet

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CDRH8D43RT125NP-100MC

Sumida America Components Inc.In Stock: 2437CDRH8D43RT125NP-100MC Datasheet

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DR74-100-R

Eaton - Electronics DivisionIn Stock: 2072DR74-100-R Datasheet

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SRN6045-100M

Bourns Inc.In Stock: 8212SRN6045-100M Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SPD74-103M requires matching the following critical electrical and mechanical parameters:

Electrical Matching Criteria:

• Inductance: 10 µH (must be identical)
• Inductance Tolerance: ±20% (standard tolerance)
• Current Rating: minimum 3.2 A (or equal to support the same operating conditions)
• DC Resistance: comparable to 49 mOhm Max (DCR affects power dissipation and thermal performance)
• Shielding: shielded construction (electromagnetic containment requirement)
• Core Material: ferrite (magnetic properties and frequency response)
• Inductance Test Frequency: 100 kHz (measurement standardization)

Mechanical Matching Criteria:

• Mounting Type: surface mount (PCB assembly compatibility)
• Package/Case: nonstandard form factor (physical fit constraints)

The four substitute parts listed (HRSPD74-103M, CDRH8D43RT125NP-100MC, DR74-100-R, SRN6045-100M) are functionally equivalent within the specified application parameters while offering varying current ratings, DCR characteristics, temperature ranges, and RoHS compliance statuses.

Parameter Comparison

Engineering Selection Recommendations

HRSPD74-103M (API Delevan Inc.) Same manufacturer as the obsolete SPD74-103M with identical inductance and comparable DC resistance. Active product status ensures continued availability. However, the current rating of 1.75 A is significantly lower than the original 3.2 A specification, limiting its use to lower-current applications. RoHS non-compliant status matches the original part. Suitable for designs with reduced current requirements.

CDRH8D43RT125NP-100MC (Sumida America Components Inc.) Offers improved compliance with RoHS certification and an Isat rating of 3.5 A, exceeding the original specification. Current rating of 2.7 A approaches the original 3.2 A requirement. DC resistance of 45 mOhm is superior to the original 49 mOhm. Operating temperature range of -40°C to 125°C is narrower than the original -55°C to 125°C specification. Suitable for applications requiring RoHS compliance and modern sourcing.

DR74-100-R (Eaton - Electronics Division) Drum core, wirewound construction matches the original SPD74-103M type. Current rating of 2.41 A with an Isat of 3.17 A closely approaches the original design. DC resistance of 48.9 mOhm is virtually identical to the original. ROHS3 compliance enables use in environmentally regulated applications. Operating temperature range of -40°C to 125°C is narrower than the original specification. Suitable for designs with compatible temperature ranges and regulatory requirements.

SRN6045-100M (Bourns Inc.) Semi-shielded construction differs from the fully shielded original, potentially affecting electromagnetic performance in noise-sensitive applications. Current rating of 2.5 A remains below the original 3.2 A specification. DC resistance of 58.6 mOhm exceeds the original maximum, increasing power dissipation. Q factor and self-resonant frequency are specified, providing additional circuit performance data. ROHS3 compliance supports modern procurement standards. Suitable for non-critical shielding applications with published frequency response characteristics.

Frequently Asked Questions (FAQ)

Can I use HRSPD74-103M as a direct replacement for SPD74-103M? The HRSPD74-103M shares identical inductance and core material, but the current rating is reduced to 1.75 A compared to 3.2 A. Use only if circuit current requirements do not exceed 1.75 A. Higher-current applications require alternative parts with higher current ratings.

Which substitute part best matches the original SPD74-103M current specification? The CDRH8D43RT125NP-100MC provides the closest current rating match at 2.7 A, with an Isat of 3.5 A, while offering RoHS certification and superior DC resistance characteristics.

What is the difference between shielded and semi-shielded construction? Shielded inductors provide complete electromagnetic containment, minimizing interference with surrounding components. Semi-shielded inductors (SRN6045-100M) offer partial shielding, suitable for less electromagnetically sensitive applications but with potential cost or size advantages.

Why is DC resistance important in inductor selection? DC resistance directly affects power dissipation in the inductor at operating current levels. Higher DCR generates increased heat (P = I²R). The original 49 mOhm specification influences thermal design; substitute parts with significantly higher DCR may require thermal re-evaluation.

Can I use these substitutes if my application requires operation below -40°C? The SPD74-103M operates to -55°C. CDRH8D43RT125NP-100MC, DR74-100-R, and SRN6045-100M all specify minimum operating temperatures of -40°C. For sub -40°C operation, HRSPD74-103M (-55°C minimum) is the only alternative with extended low-temperature rating.

Are there packaging or mounting differences that affect PCB assembly? All parts are surface-mount devices. Packaging options differ: HRSPD74-103M, CDRH8D43RT125NP-100MC, and DR74-100-R use Tape & Reel (TR); SRN6045-100M uses Cut Tape (CT) & Digi-Reel®. Original packaging type not specified; verify assembly process compatibility with available packaging formats.

What does RoHS compliance mean for my design? RoHS (Restriction of Hazardous Substances) compliance indicates the part contains no lead, mercury, cadmium, or other restricted substances. CDRH8D43RT125NP-100MC (RoHS Compliant), DR74-100-R (ROHS3 Compliant), and SRN6045-100M (ROHS3 Compliant) meet modern environmental regulations; HRSPD74-103M and the original SPD74-103M are non-compliant.