SPD73R-393M Equivalent & Substitute Parts

Part Overview

The SPD73R-393M is a 39 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 1.25 A with a maximum DC resistance of 320mOhm. This surface mount component operates across the temperature range of -55°C to 125°C and is ROHS3 compliant. The part is currently active in production with 711 pieces available in stock.

Substitute parts are identified when equivalent inductance values, current ratings, shielding characteristics, and package dimensions align within acceptable engineering tolerances, enabling direct replacement in circuit applications without design modification.

Substiute Parts

SPD73R-393M

API Delevan Inc.In Stock: 792SPD73R-393M Datasheet

Current PartRFQ

SRR0745A-390M

Bourns Inc.In Stock: 6927SRR0745A-390M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The SRR0745A-390M qualifies as a substitute based on the following alignment of critical parameters:

• Inductance Match: Both parts specify 39 µH at 1 kHz test frequency with ±20% tolerance
• Shielding Equivalence: Both employ ferrite core shielded construction
• Package Compatibility: Identical footprint dimensions of 7.30mm x 7.30mm enable direct PCB placement
• Current Capability: The substitute's 1.17 A rating remains within acceptable operating margins for applications designed for the primary part's 1.25 A specification
• DC Resistance: The substitute's 190mOhm maximum DCR is lower than the primary part's 320mOhm, representing improved electrical efficiency
• Compliance Alignment: Both parts are ROHS3 compliant and REACH unaffected

Parameter Comparison

Engineering Selection Recommendations

Both parts maintain active product status with full ROHS3 compliance and REACH unaffected designation. The SRR0745A-390M carries AEC-Q200 automotive qualification, providing additional reliability assurance for applications requiring automotive-grade components.

The substitute part presents lower DC resistance, which reduces power dissipation in the inductor. The 0.80mm height differential (4.70mm vs 3.90mm) must be evaluated against PCB clearance constraints in space-limited designs. The substitute's operating temperature floor of -40°C versus -55°C for the primary part requires verification for applications requiring extended low-temperature performance.

Frequently Asked Questions (FAQ)

Q: Can the SRR0745A-390M directly replace the SPD73R-393M on existing PCBs?

A: Direct footprint replacement is possible due to identical 7.30mm x 7.30mm dimensions. However, the substitute's maximum seated height of 4.70mm exceeds the primary part's 3.90mm. Clearance verification against nearby components and enclosure constraints is necessary before implementation.

Q: What is the impact of the 130mOhm DC resistance difference?

A: The substitute's lower DC resistance reduces resistive losses and heat generation. For a 1.25 A load, the primary part dissipates approximately 0.5 W while the substitute dissipates 0.3 W, representing a 40% reduction in power loss.

Q: Are there temperature range limitations when substituting?

A: The substitute operates from -40°C to 125°C versus the primary part's -55°C to 125°C. Applications requiring operation below -40°C must retain the original SPD73R-393M specification.

Q: How do the current ratings compare functionally?

A: The substitute's 1.17 A continuous rating is 6.4% lower than the primary part's 1.25 A. For circuits operating near maximum current specifications, margin analysis is required. The substitute's saturation current of 1.3 A provides adequate headroom for transient conditions.

Q: What certifications does each part carry?

A: Both parts are ROHS3 compliant and REACH unaffected. The substitute additionally carries AEC-Q200 automotive qualification, suitable for automotive and high-reliability applications.