SPD74-184M Equivalent & Substitute Parts

Part Overview

The SPD74-184M is a 180 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., designed for surface mount applications with a current rating of 680 mA and maximum DC resistance of 980 mOhm. This component is classified as obsolete, making identification of equivalent substitute parts essential for ongoing design support and procurement continuity. The part operates across a temperature range of -55°C to 125°C and is RoHS non-compliant.

Substiute Parts

SPD74-184M

API Delevan Inc.In Stock: 796SPD74-184M Datasheet

Current PartRFQ

HRSPD74-184M

API Delevan Inc.In Stock: 1003HRSPD74-184M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SPD74-184M is determined by strict equivalence in the following critical parameters:

Primary Equivalence Criteria:

• Inductance value: 180 µH (fixed requirement)
• Inductance tolerance: ±20% (fixed requirement)
• Core material: Ferrite (fixed requirement)
• Shielding: Shielded (fixed requirement)
• Mounting type: Surface Mount (fixed requirement)

Secondary Compatibility Parameters:

• Current rating must equal or exceed the original specification (680 mA minimum)
• DC resistance must not exceed the original maximum (980 mOhm maximum)
• Operating temperature range must encompass or exceed the original range (-55°C to 125°C minimum)
• Physical dimensions must be compatible with the nonstandard package footprint

The HRSPD74-184M from API Delevan Inc. meets the primary equivalence criteria. However, the current rating of 400 mA in the substitute part is lower than the original 680 mA specification, which represents a functional limitation in maximum current handling capacity.

Parameter Comparison

Engineering Selection Recommendations

For applications operating at or below 400 mA: The HRSPD74-184M is a direct functional substitute for the obsolete SPD74-184M. The substitute part maintains identical inductance, tolerance, core material, and shielding characteristics. The active product status of HRSPD74-184M ensures ongoing availability and supply chain continuity. The lower DC resistance (950 mOhm vs. 980 mOhm maximum) provides improved electrical performance. The extended operating temperature range (-55°C to 130°C vs. -55°C to 125°C) offers additional thermal margin. Physical dimensions are compatible within standard PCB layout tolerances for nonstandard packages.

For applications requiring 680 mA current rating: The HRSPD74-184M current rating of 400 mA does not meet the original specification. Alternative sources or custom specifications from API Delevan Inc. must be evaluated for applications requiring the full 680 mA current capacity.

Compliance Considerations: Both parts are RoHS non-compliant and REACH unaffected. Regulatory compliance requirements must be addressed through design review or alternative component selection outside this substitution group.

Frequently Asked Questions (FAQ)

Q: Can HRSPD74-184M replace SPD74-184M in all applications?

A: The HRSPD74-184M is functionally equivalent for applications operating at or below 400 mA. If your circuit requires the full 680 mA current rating of the original part, the substitute is not suitable. Verify your actual circuit current requirements before substitution.

Q: What is the impact of the lower current rating in HRSPD74-184M?

A: The substitute part has a maximum current rating of 400 mA compared to the original 680 mA. This represents a 41% reduction in current capacity. If your application draws more than 400 mA through the inductor, the substitute will saturate prematurely and fail to maintain the specified inductance value.

Q: Are the physical dimensions compatible?

A: The HRSPD74-184M dimensions (7.37 × 7.37 × 5.03 mm) are slightly larger than the SPD74-184M (7.30 × 7.30 × 4.70 mm). The differences are minimal (0.07 mm in length/width, 0.33 mm in height) and typically compatible with standard PCB layouts for nonstandard packages. Verify footprint clearance in your specific design.

Q: Why is the original SPD74-184M obsolete?

A: The SPD74-184M is classified as obsolete by the manufacturer. The HRSPD74-184M from the same manufacturer (API Delevan Inc.) represents the active product line continuation with equivalent electrical specifications for compatible current levels.

Q: What is the difference in inductance test frequency?

A: SPD74-184M is tested at 1 kHz, while HRSPD74-184M is tested at 10 kHz. Both parts maintain the same 180 µH inductance value with ±20% tolerance at their respective test frequencies. This difference reflects standard measurement methodology and does not affect functional equivalence.

Q: Is the improved DC resistance in HRSPD74-184M significant?

A: The substitute part has a maximum DC resistance of 950 mOhm compared to 980 mOhm in the original. This 30 mOhm reduction (3% improvement) results in lower resistive losses and reduced heat generation during operation, providing a minor performance advantage.

Q: What packaging format is available for HRSPD74-184M?

A: HRSPD74-184M is supplied in Tape & Reel (TR) format, which is standard for automated assembly processes. The original SPD74-184M packaging format is not specified in available data.