SPD74-474M Equivalent & Substitute Parts

Part Overview

The SPD74-474M is a 470 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 390 mA maximum current with 3.01 Ohm DC resistance. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design requirements and procurement needs. 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

SPD74-474M

API Delevan Inc.In Stock: 924SPD74-474M Datasheet

Current PartRFQ

HRSPD74-474M

API Delevan Inc.In Stock: 985HRSPD74-474M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SPD74-474M is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 470 µH (exact match required)
• Inductance tolerance: ±20% (must be equivalent or tighter)
• Core material: Ferrite (shielded configuration)
• Shielding type: Shielded (electromagnetic containment requirement)
• Mounting type: Surface Mount (PCB assembly compatibility)

Secondary Compatibility Factors:

• Current rating: Substitute must support minimum 390 mA operation
• DC resistance: Lower or equal DCR values are acceptable
• Operating temperature range: Must encompass or exceed -55°C ~ 125°C
• Physical dimensions: Nonstandard package requires dimensional compatibility for PCB layout

The HRSPD74-474M qualifies as a substitute based on matching inductance (470 µH), identical tolerance (±20%), ferrite core material, shielded configuration, and surface mount packaging. However, the current rating differential (250 mA vs. 390 mA) and DCR reduction (2.4 Ohm vs. 3.01 Ohm) represent functional parameter changes that must be evaluated within specific circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The SPD74-474M is classified as obsolete, making the HRSPD74-474M the active equivalent from API Delevan Inc. The substitute part maintains active product status, ensuring continued availability and manufacturing support.

Compliance and Certification: Both parts carry identical RoHS non-compliance and REACH unaffected designations. The HRSPD74-474M includes Moisture Sensitivity Level (MSL) 1 classification, indicating unlimited shelf life without moisture control requirements. Both components are classified under ECCN EAR99 for export control purposes.

Current Rating Differential: The HRSPD74-474M operates at 250 mA maximum current, compared to the SPD74-474M's 390 mA rating. Circuit designs operating at currents exceeding 250 mA require evaluation to confirm the substitute part's adequacy. Applications operating below 250 mA current levels are directly compatible.

DC Resistance Improvement: The substitute part exhibits lower DC resistance (2.4 Ohm vs. 3.01 Ohm), resulting in reduced power dissipation and improved thermal performance in equivalent current operating conditions.

Temperature Range Extension: The HRSPD74-474M extends the upper operating temperature limit to 130°C, compared to the main part's 125°C maximum, providing enhanced thermal margin for high-temperature applications.

Physical Dimension Variance: Dimensional differences (7.37mm x 7.37mm x 5.03mm vs. 7.30mm x 7.30mm x 4.70mm) are minimal and fall within typical PCB layout tolerances for nonstandard surface mount packages. PCB footprint verification is required for final design validation.

Frequently Asked Questions (FAQ)

Q: Can the HRSPD74-474M directly replace the SPD74-474M in all applications?

A: Direct replacement is applicable only when circuit current requirements do not exceed 250 mA. Applications designed for the SPD74-474M's 390 mA rating require circuit analysis to confirm the substitute part's adequacy. The lower current rating represents the primary functional constraint.

Q: What is the significance of the different inductance test frequencies (1 kHz vs. 10 kHz)?

A: The inductance values are specified at different measurement frequencies. The SPD74-474M uses 1 kHz test frequency, while the HRSPD74-474M uses 10 kHz. Both parts maintain the same 470 µH inductance value with ±20% tolerance across their respective test conditions. Frequency-dependent behavior in specific circuit applications should be evaluated independently.

Q: Are there packaging compatibility issues between the main part and substitute?

A: The SPD74-474M is supplied in bulk packaging, while the HRSPD74-474M is supplied in Tape & Reel (TR) format. This represents a procurement and assembly process difference, not a functional incompatibility. PCB assembly equipment compatibility with TR packaging should be confirmed with manufacturing operations.

Q: How do the physical dimension differences affect PCB layout?

A: The dimensional variance (0.07mm in length and width, 0.33mm in height) is negligible for nonstandard surface mount packages. Existing PCB footprints designed for the SPD74-474M accommodate the HRSPD74-474M without layout modification. Height clearance verification is recommended for applications with restricted vertical space.

Q: What is the impact of the improved DC resistance on circuit performance?

A: The HRSPD74-474M's lower DC resistance (2.4 Ohm vs. 3.01 Ohm) reduces resistive losses and power dissipation. In equivalent current operating conditions, this results in lower heat generation and improved efficiency. Circuit designs may benefit from this improvement, particularly in power-sensitive applications.

Q: Is the extended temperature range of the HRSPD74-474M (-55°C to 130°C) a functional advantage?

A: The additional 5°C upper temperature margin provides enhanced thermal headroom for high-temperature environments. Applications operating near the SPD74-474M's 125°C limit benefit from this extended range. For applications within the original -55°C to 125°C specification, this represents a design margin improvement without functional requirement change.

Q: What compliance considerations apply to both parts?

A: Both parts are RoHS non-compliant and REACH unaffected. Applications subject to RoHS compliance requirements cannot use either part. The HRSPD74-474M's MSL 1 rating eliminates moisture sensitivity concerns during storage and handling, simplifying supply chain management compared to higher MSL classifications.