SPD74R-472M Equivalent & Substitute Parts

Part Overview

The SPD74R-472M is a 4.7 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., designed for surface mount applications requiring moderate current handling and low DC resistance. This component is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances for this inductor category.

Substiute Parts

SPD74R-472M

API Delevan Inc.In Stock: 804SPD74R-472M Datasheet

Current PartRFQ

VLS5045EX-4R7M-H

TDK CorporationIn Stock: 4794VLS5045EX-4R7M-H Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SPD74R-472M are identified based on strict electrical and mechanical parameter alignment. The substitution logic is based on the following criteria:

Primary Matching Criteria:

• Inductance value of 4.7 µH (exact match required)
• Ferrite core material with shielding maintained
• Surface mount package configuration
• Inductance tolerance of ±20%
• RoHS3 compliance status

Secondary Compatibility Criteria:

• Current rating: substitute must support minimum 3.5 A continuous operation
• DC resistance: substitute DCR must not exceed 38 mOhm to maintain thermal performance equivalence
• Operating temperature range: substitute must cover the -55°C to 125°C specification or broader
• Saturation current: substitute Isat must be sufficient for the application current envelope

Mechanical Compatibility:

• Surface mount nonstandard package format
• Physical dimensions must be compatible with PCB layout constraints
• Tape & Reel packaging for automated assembly

Parameter Comparison

Engineering Selection Recommendations

VLS5045EX-4R7M-H Substitution Criteria:

The VLS5045EX-4R7M-H from TDK Corporation is electrically equivalent to the SPD74R-472M for applications where the following conditions are met:

1. Current Envelope: Application continuous current requirement does not exceed 3.2 A. The substitute part is rated 0.3 A lower than the main part. If the application requires the full 3.5 A continuous rating, the substitute is not suitable.

2. Thermal Dissipation: The substitute exhibits 8.8 mOhm higher DC resistance (46.8 mOhm vs. 38 mOhm). This results in proportionally higher I²R losses. Thermal design must accommodate this increased dissipation, or the substitute is not suitable.

3. Temperature Range: The substitute operates from -40°C to 125°C, compared to the main part's -55°C to 125°C. Applications requiring operation below -40°C cannot use this substitute.

4. Physical Footprint: The substitute occupies a smaller PCB area (5.30mm x 5.00mm vs. 7.30mm x 7.30mm) with lower profile (4.50mm vs. 4.70mm). PCB layout must accommodate these dimensional differences.

5. Compliance: Both parts are RoHS3 compliant with unlimited moisture sensitivity. The substitute includes AEC-Q200 automotive qualification, providing additional reliability assurance for automotive applications.

6. Availability: The substitute has higher inventory availability (4700 Pcs vs. 776 Pcs), supporting supply chain continuity.

Selection Logic:

Use VLS5045EX-4R7M-H as a substitute when: (a) continuous current ≤ 3.2 A, (b) operating temperature ≥ -40°C, (c) thermal design accommodates higher DCR, and (d) PCB layout permits smaller footprint.

Use SPD74R-472M when: (a) continuous current requirement is 3.2 A to 3.5 A, (b) operating temperature extends to -55°C, or (c) lower DC resistance is critical for thermal performance.

Frequently Asked Questions (FAQ)

Q1: Can the VLS5045EX-4R7M-H directly replace the SPD74R-472M in all applications?

No. The substitute has a lower current rating (3.2 A vs. 3.5 A) and higher DC resistance (46.8 mOhm vs. 38 mOhm). Direct replacement is only valid when the application current does not exceed 3.2 A and thermal dissipation is acceptable at the higher resistance value.

Q2: What is the impact of the 8.8 mOhm higher DC resistance?

Higher DC resistance increases power dissipation according to P = I²R. At 3.2 A, the substitute dissipates approximately 0.478 W compared to 0.389 W for the main part, an increase of 23%. Thermal design must account for this difference.

Q3: Why does the substitute have a narrower operating temperature range?

The substitute operates from -40°C to 125°C while the main part operates from -55°C to 125°C. Applications requiring operation below -40°C must use the main part or identify an alternative substitute with extended low-temperature rating.

Q4: Are the physical dimensions compatible with existing PCB layouts?

No. The substitute is significantly smaller (5.30mm x 5.00mm vs. 7.30mm x 7.30mm). PCB layouts designed for the main part must be re-evaluated for the substitute. The smaller footprint may allow layout optimization but requires design verification.

Q5: What does AEC-Q200 qualification on the substitute indicate?

AEC-Q200 is an automotive industry standard for passive components. The substitute's AEC-Q200 rating indicates it meets automotive reliability and quality requirements, providing additional assurance for automotive applications. The main part does not carry this designation.

Q6: Can both parts be used interchangeably in the same design?

No. The electrical and thermal differences require design-specific evaluation. A design qualified with one part cannot automatically use the other without re-qualification of thermal performance, current handling, and temperature range coverage.

Q7: Which part should be selected for new designs?

For new designs, evaluate the specific application requirements: (a) required continuous current, (b) minimum operating temperature, (c) thermal budget, and (d) PCB space constraints. Select the part that meets all requirements with appropriate design margins.

Q8: Are both parts RoHS3 compliant?

Yes. Both SPD74R-472M and VLS5045EX-4R7M-H are RoHS3 compliant with unlimited moisture sensitivity (MSL 1), meeting current environmental and regulatory requirements.