SPD74-183M Equivalent & Substitute Parts Reference

Part Overview

The SPD74-183M is a 18 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 2.3 A continuous current with a maximum DC resistance of 91 mOhm. This component is classified as obsolete, making equivalent and substitute parts necessary 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 measuring 7.30mm × 7.30mm × 4.70mm (height).

Substiute Parts

SPD74-183M

API Delevan Inc.In Stock: 1075SPD74-183M Datasheet

Current PartRFQ

HRSPD74-183M

API Delevan Inc.In Stock: 813HRSPD74-183M Datasheet

SimilarRFQ

SRR0745A-180M

Bourns Inc.In Stock: 6650SRR0745A-180M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SPD74-183M is determined by the following critical parameters:

• Inductance Value: Must be 18 µH with ±20% tolerance
• Core Material: Ferrite construction required
• Shielding: Shielded configuration mandatory
• Mounting Type: Surface mount only
• Physical Footprint: Package dimensions must accommodate 7.30mm × 7.30mm base and 4.70mm maximum height
• DC Resistance: Maximum 91 mOhm acceptable
• Current Rating: Minimum 2.3 A continuous current capability

The substitute parts identified below meet these core electrical and mechanical parameters. Current rating variations are noted where they differ from the main part specification.

Parameter Comparison

Engineering Selection Recommendations

HRSPD74-183M (API Delevan Inc.)

This part maintains API Delevan Inc. manufacturer continuity and shares identical inductance, tolerance, and core specifications with the SPD74-183M. The HRSPD74-183M is currently in active production status, ensuring long-term availability. However, the current rating is reduced to 1.28 A, which is below the original 2.3 A specification. This part is suitable only for applications where the circuit current requirement does not exceed 1.28 A. The package height increases to 5.03 mm, requiring verification of PCB layout clearance. Operating temperature range extends to 130°C, providing improved thermal margin. RoHS non-compliance status matches the original part.

SRR0745A-180M (Bourns Inc.)

This part provides the closest electrical and mechanical match to the SPD74-183M. Physical dimensions (7.30mm × 7.30mm × 4.70mm) are identical, and DC resistance specifications are equivalent at 90 mOhm maximum. The current rating of 1.8 A falls between the original 2.3 A and the HRSPD74-183M alternative, providing a compromise solution for moderate current applications. The SRR0745A-180M is actively produced and carries AEC-Q200 qualification, indicating automotive-grade reliability. ROHS3 compliance status represents an improvement over the original part's non-compliant status. Operating temperature range is -40°C to 125°C, which covers the upper specification of the original part but does not extend to the -55°C lower limit.

Selection Criteria Summary

• Use SRR0745A-180M for applications requiring maximum compatibility with original footprint, improved compliance status, and current requirements up to 1.8 A
• Use HRSPD74-183M only when circuit current does not exceed 1.28 A and manufacturer continuity with API Delevan is required
• Verify PCB layout clearance if selecting HRSPD74-183M due to increased height
• Confirm operating temperature requirements; SRR0745A-180M does not support -55°C minimum specification

Frequently Asked Questions (FAQ)

Q: Can the HRSPD74-183M directly replace the SPD74-183M in all applications?

A: No. While the HRSPD74-183M shares identical inductance and tolerance specifications, its current rating of 1.28 A is significantly lower than the original 2.3 A rating. Substitution is valid only for circuits where the maximum current does not exceed 1.28 A. Additionally, the increased package height of 5.03 mm versus 4.70 mm requires PCB layout verification.

Q: What are the physical compatibility considerations between these parts?

A: The SPD74-183M and SRR0745A-180M share identical footprint dimensions (7.30mm × 7.30mm) and height (4.70mm), making them physically interchangeable on PCB layouts. The HRSPD74-183M has a slightly larger footprint (7.37mm × 7.37mm) and increased height (5.03mm), which may require PCB rework depending on available clearance.

Q: Does the SRR0745A-180M meet the original operating temperature specification?

A: Partially. The SRR0745A-180M operates from -40°C to 125°C, which covers the upper temperature range of the original part (-55°C to 125°C) but does not extend to the -55°C lower limit. Applications requiring operation below -40°C cannot use this substitute.

Q: What is the significance of RoHS compliance differences?

A: The original SPD74-183M is RoHS non-compliant. The SRR0745A-180M is ROHS3 compliant, which may be advantageous for new designs or regulatory requirements. The HRSPD74-183M maintains non-compliant status, matching the original part's regulatory position.

Q: Are there current rating trade-offs with these substitutes?

A: Yes. The original SPD74-183M is rated for 2.3 A. The SRR0745A-180M provides 1.8 A (78% of original), and the HRSPD74-183M provides 1.28 A (56% of original). Circuit design must accommodate these reduced ratings, or the original part must be sourced from inventory.

Q: What packaging formats are available for these substitutes?

A: Both substitute parts are supplied in Tape & Reel (TR) packaging, which is standard for automated assembly. The original SPD74-183M packaging format is not specified in available documentation.