SPD73R-474M Equivalent & Substitute Parts

Part Overview

The SPD73R-474M is a 470 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 380 mA continuous current with a maximum DC resistance of 4.18Ohm. This component is classified as Active and is ROHS3 compliant. Alternative parts may be required due to inventory constraints, application-specific performance requirements, or supply chain considerations while maintaining electrical and mechanical compatibility within specified tolerances.

Substiute Parts

SPD73R-474M

API Delevan Inc.In Stock: 1123SPD73R-474M Datasheet

Current PartRFQ

SRR0745A-471M

Bourns Inc.In Stock: 4770SRR0745A-471M Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SPD73R-474M is determined by the following critical parameters:

• Inductance value of 470 µH with ±20% tolerance
• Shielded ferrite core construction
• Surface mount package with 7.30mm x 7.30mm footprint
• Current rating capability of at least 380 mA
• DC resistance within acceptable operating limits
• Operating temperature range compatibility
• ROHS3 compliance and regulatory alignment

The SRR0745A-471M from Bourns Inc. meets these substitution criteria. While the current rating is lower at 290 mA and DC resistance is reduced to 2.2Ohm, the part maintains the same inductance value, core material, shielding configuration, and footprint dimensions. The saturation current of 340 mA approaches the required 380 mA threshold, making this part suitable for applications where the full 380 mA rating is not continuously required.

Parameter Comparison

Engineering Selection Recommendations

Both the SPD73R-474M and SRR0745A-471M are Active products with ROHS3 compliance and REACH Unaffected status. The SRR0745A-471M carries AEC-Q200 qualification, indicating automotive-grade reliability standards.

Selection between these parts should be based on application current requirements. The SPD73R-474M supports the full 380 mA continuous current rating. The SRR0745A-471M is suitable for applications requiring up to 290 mA continuous operation, with saturation current of 340 mA available for transient conditions.

The lower DC resistance of the SRR0745A-471M (2.2Ohm vs. 4.18Ohm) results in reduced power dissipation and heat generation. The SPD73R-474M operates across a wider temperature range (-55°C to 125°C versus -40°C to 125°C), making it preferable for extreme low-temperature environments.

Height difference of 0.80mm (3.90mm vs. 4.70mm) may be relevant for space-constrained PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can the SRR0745A-471M directly replace the SPD73R-474M in all applications?

A: Direct replacement is possible only in applications where the continuous current requirement does not exceed 290 mA. The saturation current of 340 mA accommodates brief transient conditions. Applications requiring sustained 380 mA operation must use the SPD73R-474M.

Q: What is the impact of different DC resistance values?

A: The SRR0745A-471M has lower DC resistance (2.2Ohm vs. 4.18Ohm), resulting in lower power dissipation at the same current level. This reduces thermal load but does not affect inductance value or filtering performance.

Q: Are there PCB layout considerations?

A: Both parts share identical footprint dimensions (7.30mm x 7.30mm). The SRR0745A-471M is 0.80mm taller (4.70mm vs. 3.90mm seated height), which may affect clearance in height-restricted designs.

Q: What is the significance of the operating temperature range difference?

A: The SPD73R-474M operates from -55°C to 125°C, while the SRR0745A-471M operates from -40°C to 125°C. Applications requiring operation below -40°C must use the SPD73R-474M.

Q: Do both parts meet the same compliance standards?

A: Both parts are ROHS3 compliant, REACH Unaffected, and classified as EAR99 for export control. The SRR0745A-471M additionally carries AEC-Q200 automotive qualification.

Q: What packaging differences exist?

A: The SPD73R-474M is supplied in Cut Tape (CT) & Digi-Reel format. The SRR0745A-471M is supplied in Tape & Reel (TR) format. Both are suitable for automated assembly processes.