SPD73R-394M Equivalent & Substitute Parts

Part Overview

The SPD73R-394M is a 390 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 480 mA with a maximum DC resistance of 2.94Ohm. This surface mount component is designed for applications requiring fixed inductance in compact form factors with ferrite core shielding. The part maintains active product status with ROHS3 compliance and unlimited moisture sensitivity rating. Substitute parts may be required due to inventory constraints, lead time considerations, or application-specific performance requirements while maintaining equivalent electrical and mechanical specifications.

Substiute Parts

SPD73R-394M

API Delevan Inc.In Stock: 1110SPD73R-394M Datasheet

Current PartRFQ

SRR0745A-391M

Bourns Inc.In Stock: 3776SRR0745A-391M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SPD73R-394M is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 390 µH (±20% tolerance band)
• Core material: Ferrite with shielding
• Mounting type: Surface Mount
• Package footprint: 7.30mm x 7.30mm

Secondary Compatibility Factors:

• Current rating must meet or exceed application requirements
• DC resistance characteristics must be compatible with circuit design
• Operating temperature range must encompass application environment
• Compliance certifications (ROHS3, REACH Unaffected)

The SRR0745A-391M from Bourns Inc. qualifies as a substitute based on matching inductance specification, identical footprint dimensions, ferrite shielded construction, and surface mount configuration. Electrical performance differences in current rating and DC resistance require circuit-level evaluation for specific applications.

Parameter Comparison

Engineering Selection Recommendations

Both the SPD73R-394M and SRR0745A-391M maintain active product status with ROHS3 compliance and REACH Unaffected designation, ensuring regulatory alignment for current applications. The SRR0745A-391M carries AEC-Q200 qualification, providing automotive-grade reliability certification.

Selection between these parts depends on application current requirements. The SPD73R-394M supports 480 mA continuous current with 480 mA saturation current, while the SRR0745A-391M is rated for 320 mA continuous with 360 mA saturation. Applications requiring the full 480 mA rating must use the SPD73R-394M. The SRR0745A-391M offers lower DC resistance (1.85Ohm vs 2.94Ohm), reducing power dissipation in current-limited applications.

Temperature range consideration: The SPD73R-394M extends to -55°C minimum, while the SRR0745A-391M operates from -40°C minimum. Applications requiring sub-40°C operation require the SPD73R-394M.

Physical height difference of 0.80mm (3.90mm vs 4.70mm) may impact PCB layout constraints in space-limited designs.

Frequently Asked Questions (FAQ)

Q: Can SRR0745A-391M replace SPD73R-394M in all applications?

A: Substitution is valid only when application current requirements do not exceed 320 mA continuous and 360 mA saturation. If the circuit draws more than 320 mA, the SRR0745A-391M will not function as specified. Operating temperature minimum of -40°C must also be compatible with the application environment.

Q: What are the key differences between these inductors?

A: Both parts share identical 390 µH inductance, ±20% tolerance, 7.30mm x 7.30mm footprint, ferrite shielded construction, and surface mount configuration. Differences include current rating (480 mA vs 320 mA), DC resistance (2.94Ohm vs 1.85Ohm), operating temperature minimum (-55°C vs -40°C), and seated height (3.90mm vs 4.70mm).

Q: Does the lower DC resistance of SRR0745A-391M provide better performance?

A: Lower DC resistance reduces I²R power dissipation, which is beneficial for thermal management in current-limited applications. However, this advantage applies only within the SRR0745A-391M's 320 mA current rating limit.

Q: Are both parts suitable for automotive applications?

A: The SRR0745A-391M carries AEC-Q200 automotive qualification. The SPD73R-394M does not list automotive certification in provided specifications.

Q: What is the impact of the 0.80mm height difference?

A: The SRR0745A-391M's 4.70mm seated height versus SPD73R-394M's 3.90mm height may affect PCB layout in applications with strict vertical clearance constraints. Verify clearance requirements in your specific design.

Q: Are both parts RoHS compliant?

A: Yes, both SPD73R-394M and SRR0745A-391M are ROHS3 compliant and REACH Unaffected, meeting current environmental regulations.