SPD73-393M Equivalent & Substitute Parts Reference

Part Overview

The SPD73-393M is a 39 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 850 mA continuous current with a maximum DC resistance of 320 mOhm. This surface mount component operates across the temperature range of -55°C to 125°C and is designed for applications requiring fixed inductance in compact form factors.

The SPD73-393M carries an obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for systems utilizing this inductor specification.

Substiute Parts

SPD73-393M

API Delevan Inc.In Stock: 894SPD73-393M Datasheet

Current PartRFQ

SRR0745A-390M

Bourns Inc.In Stock: 6927SRR0745A-390M Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SPD73-393M are identified based on strict equivalence of the following critical parameters:

Primary Matching Criteria:

• Inductance value: 39 µH
• Inductance tolerance: ±20%
• Core material: Ferrite
• Shielding: Shielded
• Mounting type: Surface Mount
• Physical footprint: 7.30 mm × 7.30 mm

Secondary Compatibility Factors:

• Current rating must equal or exceed 850 mA
• DC resistance must not exceed 320 mOhm
• Operating temperature range must encompass or exceed -55°C to 125°C
• Package classification: Nonstandard surface mount

The SRR0745A-390M from Bourns Inc. satisfies all primary matching criteria and demonstrates improved electrical performance characteristics relative to the obsolete SPD73-393M specification.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility:

The SRR0745A-390M is a direct functional substitute for the SPD73-393M based on electrical parameter equivalence. Both components share identical inductance values, tolerance specifications, core material composition, shielding configuration, and physical footprint dimensions.

Performance Advantages of SRR0745A-390M:

The Bourns substitute demonstrates superior electrical characteristics: current rating increased from 850 mA to 1.17 A, saturation current increased from 850 mA to 1.3 A, and DC resistance reduced from 320 mOhm maximum to 190 mOhm maximum. These improvements provide enhanced thermal performance and reduced power dissipation in equivalent circuit applications.

Compliance and Availability Considerations:

The SRR0745A-390M carries active product status with ROHS3 compliance certification, addressing regulatory requirements for new designs and manufacturing environments. The substitute is supplied in Tape & Reel packaging format, suitable for automated assembly processes. The SPD73-393M, classified as obsolete, presents supply chain risk and does not meet current environmental compliance standards.

Temperature Range Consideration:

The SRR0745A-390M operates across -40°C to 125°C, compared to the SPD73-393M range of -55°C to 125°C. Applications requiring operation below -40°C require verification of thermal performance requirements before substitution.

Height Dimension Variance:

The seated height of the SRR0745A-390M is 4.70 mm maximum, compared to 3.90 mm for the SPD73-393M. PCB layout clearance verification is required for applications with height-constrained mounting environments.

Frequently Asked Questions (FAQ)

Q: Can the SRR0745A-390M directly replace the SPD73-393M in existing designs?

A: The SRR0745A-390M satisfies all primary electrical specifications for the SPD73-393M. Physical footprint dimensions are identical at 7.30 mm × 7.30 mm. Verification is required for: (1) PCB clearance for the increased seated height of 4.70 mm versus 3.90 mm, and (2) operating temperature requirements below -40°C.

Q: What are the key electrical differences between these inductors?

A: Both components provide 39 µH inductance with ±20% tolerance. The SRR0745A-390M provides higher current capacity (1.17 A versus 850 mA) and lower DC resistance (190 mOhm versus 320 mOhm maximum). These differences result in reduced power dissipation and improved thermal performance in the substitute part.

Q: Are there packaging format differences?

A: The SPD73-393M is supplied in bulk packaging. The SRR0745A-390M is supplied in Tape & Reel (TR) format, standard for automated surface mount assembly processes. Reel format may require adjustment to component handling and placement equipment.

Q: Does the SRR0745A-390M meet current environmental compliance standards?

A: The SRR0745A-390M carries ROHS3 compliance certification. The SPD73-393M is classified as RoHS non-compliant. The substitute meets current environmental regulatory requirements for new product designs and manufacturing in regulated markets.

Q: What is the impact of the lower minimum operating temperature on the SRR0745A-390M?

A: The SRR0745A-390M operates from -40°C minimum, compared to -55°C for the SPD73-393M. Applications requiring operation below -40°C must verify that the substitute meets thermal performance specifications at the lower temperature limit of the design requirement.

Q: Are both inductors shielded?

A: Both the SPD73-393M and SRR0745A-390M are shielded ferrite core inductors. Shielding characteristics are equivalent for electromagnetic interference mitigation in equivalent circuit applications.

Q: What is the significance of the AEC-Q200 rating on the SRR0745A-390M?

A: The SRR0745A-390M carries AEC-Q200 qualification, indicating compliance with automotive electronics reliability standards. This certification is not applicable to the obsolete SPD73-393M. The AEC-Q200 rating provides additional reliability assurance for applications requiring automotive-grade component qualification.