SPD74-223M Equivalent & Substitute Parts Reference

Part Overview

The SPD74-223M is a 22 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 2 A continuous current with 110 mOhm maximum DC resistance. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design support and procurement continuity. The part operates across the temperature range of -55°C to 125°C and is mounted as a surface mount device in a nonstandard package configuration.

Substiute Parts

SPD74-223M

API Delevan Inc.In Stock: 733SPD74-223M Datasheet

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HRSPD74-223M

API Delevan Inc.In Stock: 1039HRSPD74-223M Datasheet

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SRR0745A-220M

Bourns Inc.In Stock: 6287SRR0745A-220M Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SPD74-223M are identified based on the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Inductance value: 22 µH (exact match required)
• Inductance tolerance: ±20% (matching tolerance band)
• Core material: Ferrite (shielded configuration)
• Shielding: Shielded (electromagnetic containment requirement)
• Mounting type: Surface Mount (PCB assembly compatibility)
• Package footprint: Nonstandard 7.30 mm × 7.30 mm base dimensions

Secondary Compatibility Parameters:

• Current rating: Minimum 1.1 A (design dependent; higher ratings provide margin)
• DC resistance: Maximum 110 mOhm (lower values acceptable for reduced losses)
• Operating temperature: Minimum -55°C to 125°C overlap required
• Saturation current: Minimum 1.75 A (design dependent)

The two identified substitutes meet these criteria with variations in current rating, DC resistance, and temperature range that remain within acceptable engineering tolerances for equivalent circuit performance.

Parameter Comparison

Engineering Selection Recommendations

HRSPD74-223M (API Delevan Inc.): This substitute maintains the same manufacturer lineage and identical DC resistance specification. The part is active in production with extended temperature range (-55°C to 130°C). However, the current rating is reduced to 1.1 A, which represents a 45% decrease from the main part specification. Selection of this substitute is appropriate only for applications where the circuit current requirement does not exceed 1.1 A. The slightly larger package footprint (7.37 × 7.37 × 5.03 mm versus 7.30 × 7.30 × 4.70 mm) requires PCB layout verification. RoHS non-compliance status matches the main part.

SRR0745A-220M (Bourns Inc.): This substitute provides improved DC resistance (96 mOhm versus 110 mOhm maximum), resulting in lower power dissipation. The current rating of 1.65 A accommodates applications requiring up to 1.65 A continuous current. The saturation current specification of 1.75 A provides defined headroom. Package dimensions are identical to the main part (7.30 × 7.30 × 4.70 mm), ensuring direct PCB compatibility. This part carries ROHS3 compliance certification and AEC-Q200 automotive qualification, providing enhanced regulatory and quality assurance status. Operating temperature range (-40°C to 125°C) covers the upper portion of the main part specification but does not extend to -55°C.

Selection Logic:

• For applications requiring the full 2 A rating: Neither substitute is fully rated; circuit redesign or alternative component sourcing is required.
• For applications operating at 1.65 A or below with standard temperature range (-40°C to 125°C): SRR0745A-220M is preferred due to superior DC resistance, compliance status, and identical footprint.
• For applications requiring extended low-temperature operation (-55°C): HRSPD74-223M maintains the temperature specification but is limited to 1.1 A.
• For applications with current requirements between 1.1 A and 1.65 A: SRR0745A-220M is the appropriate selection.

Frequently Asked Questions (FAQ)

Q: Can the SPD74-223M be directly replaced with HRSPD74-223M?

A: Direct replacement is possible only if the circuit current requirement does not exceed 1.1 A. The HRSPD74-223M is rated for 1.1 A continuous current, compared to 2 A for the SPD74-223M. PCB layout must accommodate the slightly larger package dimensions (7.37 × 7.37 × 5.03 mm versus 7.30 × 7.30 × 4.70 mm). Both parts share identical inductance, tolerance, DC resistance, and core material specifications.

Q: What are the advantages of SRR0745A-220M over the original SPD74-223M?

A: The SRR0745A-220M offers three primary advantages: (1) reduced DC resistance of 96 mOhm maximum versus 110 mOhm, resulting in lower power dissipation; (2) ROHS3 compliance certification, meeting current environmental regulations; (3) AEC-Q200 automotive qualification, providing enhanced reliability documentation. The package footprint is identical, ensuring direct PCB compatibility. The trade-off is a reduced current rating of 1.65 A versus 2 A and a narrower low-temperature operating range (-40°C minimum versus -55°C).

Q: Are there any package compatibility issues when substituting these parts?

A: The SRR0745A-220M maintains identical package dimensions (7.30 × 7.30 × 4.70 mm) to the SPD74-223M and requires no PCB layout modification. The HRSPD74-223M has slightly larger dimensions (7.37 × 7.37 × 5.03 mm), requiring verification that the PCB footprint and surrounding component placement accommodate the increased length, width, and height. Solder pad spacing and clearance to adjacent components must be confirmed before assembly.

Q: Which substitute is suitable for automotive applications?

A: The SRR0745A-220M carries AEC-Q200 automotive qualification, making it suitable for automotive circuit applications. The HRSPD74-223M and original SPD74-223M do not carry automotive certification. If automotive qualification is a design requirement, SRR0745A-220M is the appropriate selection, provided the 1.65 A current rating and -40°C to 125°C temperature range meet the application specifications.

Q: What is the impact of different inductance test frequencies on circuit performance?

A: The SPD74-223M and SRR0745A-220M are tested at 1 kHz, while the HRSPD74-223M is tested at 100 kHz. The inductance value of 22 µH with ±20% tolerance is specified at these respective frequencies. For circuits operating at frequencies significantly different from the test frequency, inductor impedance characteristics may vary. Circuit simulation or empirical testing is necessary to confirm performance if the operating frequency deviates substantially from the specified test frequency.

Q: Can the SPD74-223M be used in applications requiring -55°C operation if substitutes are selected?

A: The HRSPD74-223M maintains the -55°C minimum operating temperature specification. The SRR0745A-220M is rated only to -40°C minimum. For applications requiring -55°C operation, the HRSPD74-223M is the only substitute that meets this specification, provided the 1.1 A current rating is acceptable for the circuit design.

Q: What is the significance of RoHS compliance status for these parts?

A: The SPD74-223M and HRSPD74-223M are RoHS non-compliant, indicating they may contain restricted substances such as lead. The SRR0745A-220M is ROHS3 compliant, meeting current environmental regulations for new product designs and procurement in regulated markets. For applications subject to RoHS requirements, SRR0745A-220M is the appropriate selection. For legacy systems or applications without RoHS constraints, all three parts are functionally equivalent within their respective current and temperature ratings.