SPD74-123M Equivalent & Substitute Parts

Part Overview

The SPD74-123M is a 12 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 2.8 A continuous current with a maximum DC resistance of 38 mOhm. This component is designed for surface mount applications in nonstandard package configurations and operates across the temperature range of -55°C to 125°C.

The SPD74-123M has reached obsolete product status. Locating equivalent or substitute components is necessary to support ongoing maintenance, repair, and redesign activities for systems currently utilizing this inductor.

Substiute Parts

SPD74-123M

API Delevan Inc.In Stock: 1001SPD74-123M Datasheet

Current PartRFQ

HRSPD74-123M

API Delevan Inc.In Stock: 959HRSPD74-123M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SPD74-123M is determined by the following critical parameters:

Mandatory Matching Parameters:

• Inductance value: 12 µH
• Inductance tolerance: ±20%
• Core material: Ferrite
• Shielding: Shielded
• Mounting type: Surface Mount
• Package type: Nonstandard

Allowable Variation Parameters:

• Current rating: Must equal or exceed 2.8 A
• DC resistance (DCR): Must not exceed 38 mOhm
• Operating temperature range: Must encompass or extend the -55°C to 125°C range
• Physical dimensions: Minor variations acceptable within nonstandard package constraints
• Product status: Active status preferred for ongoing availability
• Packaging format: May differ (e.g., Tape & Reel vs. bulk)

The HRSPD74-123M qualifies as a substitute based on matching inductance, tolerance, core material, shielding, and mounting type. However, the current rating is lower (1.65 A versus 2.8 A) and DC resistance is higher (60 mOhm versus 38 mOhm maximum), requiring circuit-level evaluation before implementation.

Parameter Comparison

Engineering Selection Recommendations

SPD74-123M (Original Component): The SPD74-123M is obsolete and no longer manufactured. Current inventory of 939 pieces is available through existing stock channels. This component is suitable only for direct replacement in existing systems where supply exists and no design modifications are permissible.

HRSPD74-123M (Substitute Component): The HRSPD74-123M is an active product with 948 pieces in current inventory. This component shares the same inductance value, tolerance, core material, and shielding characteristics as the SPD74-123M. The HRSPD74-123M is manufactured by the same supplier (API Delevan Inc.) and is available in standard Tape & Reel packaging, supporting production and repair workflows.

Critical Differences Requiring Evaluation:

1. Current Rating: The HRSPD74-123M is rated for 1.65 A continuous current, compared to 2.8 A for the SPD74-123M. Applications requiring the full 2.8 A rating cannot use the HRSPD74-123M without circuit redesign or parallel component configurations.

2. DC Resistance: The HRSPD74-123M exhibits a maximum DC resistance of 60 mOhm, versus 38 mOhm for the SPD74-123M. This 58% increase in resistance will result in higher power dissipation and heat generation in the inductor. Thermal analysis of the application circuit is required.

3. Physical Dimensions: The HRSPD74-123M is marginally larger (0.290" x 0.290" x 0.198" versus 0.287" x 0.287" x 0.185"). PCB layout verification is necessary to confirm fit within existing component placement constraints.

4. Temperature Range: The HRSPD74-123M extends the upper operating temperature limit to 130°C, providing a 5°C margin improvement over the original specification.

Compliance Status: Both components are RoHS non-compliant and REACH unaffected. No compliance advantage exists between the original and substitute components.

Frequently Asked Questions (FAQ)

Q: Can the HRSPD74-123M directly replace the SPD74-123M in all applications?

A: Direct replacement is not universal. The HRSPD74-123M matches the inductance value and core characteristics but differs in current rating (1.65 A versus 2.8 A) and DC resistance (60 mOhm versus 38 mOhm). Applications operating at or near the 2.8 A rating or requiring the lower DCR specification require circuit-level analysis before substitution.

Q: What is the impact of the higher DC resistance in the HRSPD74-123M?

A: The 60 mOhm maximum DCR in the HRSPD74-123M produces greater resistive losses compared to the 38 mOhm specification of the SPD74-123M. In a circuit carrying 2.0 A, this represents an additional power dissipation of approximately 44 mW. Thermal management and efficiency calculations must be performed for the specific application.

Q: Are the physical dimensions of the HRSPD74-123M compatible with existing PCB layouts?

A: The HRSPD74-123M dimensions (0.290" L x 0.290" W x 0.198" H) are slightly larger than the SPD74-123M (0.287" L x 0.287" W x 0.185" H). PCB layout files must be reviewed to confirm that the increased footprint and height do not create clearance conflicts with adjacent components or board constraints.

Q: Why is the SPD74-123M obsolete?

A: The SPD74-123M has reached end-of-life status and is no longer manufactured by API Delevan Inc. The HRSPD74-123M represents the active product line continuation with equivalent inductance and core specifications.

Q: What packaging formats are available for each component?

A: The SPD74-123M packaging format is not specified in available documentation. The HRSPD74-123M is supplied in Tape & Reel (TR) format, supporting automated assembly and production workflows.

Q: Are there any compliance or certification differences between these components?

A: Both components share identical RoHS non-compliant and REACH unaffected status. No compliance advantage exists between the original and substitute components.

Q: What is the inductance test frequency for each component?

A: The SPD74-123M inductance is tested at 1 kHz. The HRSPD74-123M inductance is tested at 100 kHz. This difference in test frequency may result in minor inductance value variations at different operating frequencies within the application circuit.