SPD73-563M Equivalent & Substitute Parts Reference

Part Overview

The SPD73-563M is a 56 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 701 mA continuous current with a maximum DC resistance of 470 mOhm. This component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. The part operates across the temperature range of -55°C to 125°C and is mounted as a surface mount device in a nonstandard 7.30mm × 7.30mm footprint.

Due to its obsolete status, sourcing equivalent or substitute inductors with matching electrical and mechanical specifications is essential for design continuity and supply chain management.

Substiute Parts

SPD73-563M

API Delevan Inc.In Stock: 727SPD73-563M Datasheet

Current PartRFQ

CDRH73NP-560MC-B

Sumida America Components Inc.In Stock: 704CDRH73NP-560MC-B Datasheet

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SRR0745A-560M

Bourns Inc.In Stock: 4863SRR0745A-560M Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SPD73-563M is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 56 µH (±20% tolerance)
• Core material: Ferrite, shielded construction
• Mounting type: Surface mount
• Footprint dimensions: 7.30mm × 7.30mm (length and width)
• Inductance test frequency: 1 kHz

Secondary Compatibility Factors:

• Current rating: Substitute must support minimum 701 mA continuous current
• DC resistance: Maximum 470 mOhm
• Operating temperature range: Minimum coverage of -55°C to 125°C or equivalent operational envelope
• Package type: Nonstandard surface mount compatible with original footprint

The two identified substitute parts—CDRH73NP-560MC-B (Sumida America Components Inc.) and SRR0745A-560M (Bourns Inc.)—satisfy the primary matching criteria. Both maintain the 56 µH inductance specification, ferrite core construction, shielded design, and 7.30mm × 7.30mm footprint dimensions required for direct substitution.

Parameter Comparison

Engineering Selection Recommendations

CDRH73NP-560MC-B (Sumida America Components Inc.):

This substitute maintains electrical equivalence with the SPD73-563M across inductance, tolerance, core material, and shielding specifications. The current rating of 680 mA is marginally below the original 701 mA specification; applications operating at or near the maximum current threshold require verification of circuit performance. The DC resistance matches at 470 mOhm maximum. The operating temperature range (-40°C to 100°C) is narrower than the original (-55°C to 125°C), limiting use in extreme cold or high-temperature environments. The component is ROHS3 compliant and carries MSL 1 (Unlimited) moisture sensitivity rating. Height is reduced to 3.40mm, providing improved PCB clearance. This part is suitable for applications with moderate current demands and standard operating temperature requirements.

SRR0745A-560M (Bourns Inc.):

This substitute provides superior electrical performance relative to the SPD73-563M. The current rating of 950 mA exceeds the original specification by 249 mA, with saturation current of 1.1A providing additional margin. The DC resistance is reduced to 240 mOhm maximum, representing a 49% improvement over the original 470 mOhm specification, resulting in lower power dissipation and improved thermal performance. The operating temperature range (-40°C to 125°C) covers the upper limit of the original specification but does not extend to -55°C. The component is ROHS3 compliant with MSL 1 rating and carries AEC-Q200 automotive qualification. Height is increased to 4.70mm. This part is recommended for applications requiring enhanced current capacity, reduced losses, and automotive-grade reliability.

Selection Basis:

Both substitutes are active products with established supply chains. The choice between them depends on circuit current requirements, thermal constraints, and temperature operating envelope. CDRH73NP-560MC-B is appropriate for designs matching the original current specification. SRR0745A-560M is appropriate for designs benefiting from increased current margin and reduced DC resistance, provided the increased height does not create PCB layout conflicts.

Frequently Asked Questions (FAQ)

Q: Can CDRH73NP-560MC-B be used as a direct replacement for SPD73-563M in all applications?

A: CDRH73NP-560MC-B matches the SPD73-563M in inductance (56 µH), tolerance (±20%), core material (ferrite), shielding, footprint (7.30mm × 7.30mm), and DC resistance (470 mOhm maximum). However, the current rating is 680 mA versus 701 mA, and the operating temperature range is -40°C to 100°C versus -55°C to 125°C. Applications operating at maximum current or in temperature extremes require circuit analysis to confirm compatibility.

Q: What are the advantages of SRR0745A-560M over CDRH73NP-560MC-B?

A: SRR0745A-560M provides 950 mA current rating (versus 680 mA), 240 mOhm DC resistance (versus 470 mOhm), and extends the upper temperature limit to 125°C (matching the original). It carries AEC-Q200 automotive qualification. The trade-off is increased height (4.70mm versus 3.40mm), which may affect PCB layout.

Q: Are there temperature limitations when substituting for the SPD73-563M?

A: Yes. CDRH73NP-560MC-B operates from -40°C to 100°C, which does not cover the original -55°C lower limit. SRR0745A-560M operates from -40°C to 125°C, covering the upper limit but not the lower -55°C specification. Applications requiring the full -55°C to 125°C range must evaluate whether the narrower operating envelope is acceptable for the intended use case.

Q: Do the substitute parts have different packaging formats?

A: Both CDRH73NP-560MC-B and SRR0745A-560M are supplied in Tape & Reel (TR) packaging, which is standard for surface mount production. The original SPD73-563M packaging format is not specified in the available data. Verify packaging compatibility with assembly equipment and procurement workflows.

Q: What is the significance of RoHS3 compliance on the substitute parts?

A: Both substitute parts are ROHS3 compliant, indicating conformance to the Restriction of Hazardous Substances Directive. The original SPD73-563M is RoHS non-compliant. If the application or end-market requires RoHS compliance, either substitute part satisfies this requirement.

Q: Can height differences affect PCB design?

A: Yes. The original SPD73-563M has a maximum seated height of 3.90mm. CDRH73NP-560MC-B is 3.40mm (0.50mm shorter), and SRR0745A-560M is 4.70mm (0.80mm taller). Designs with tight vertical clearance constraints must account for these differences during PCB layout and component placement verification.

Q: What does MSL 1 (Unlimited) moisture sensitivity mean?

A: MSL 1 indicates the component has unlimited shelf life and does not require special moisture control during storage or handling. Both substitute parts carry this rating, simplifying logistics and inventory management compared to higher MSL components.