SPD73-564M Equivalent & Substitute Parts Reference

Part Overview

The SPD73-564M is a 560 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 222 mA with a maximum DC resistance of 4.67 Ohm. This surface mount component operates across the temperature range of -55°C to 125°C and is designed for nonstandard package applications. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

SPD73-564M

API Delevan Inc.In Stock: 938SPD73-564M Datasheet

Current PartRFQ

CDRH73NP-561MC-B

Sumida America Components Inc.In Stock: 1060CDRH73NP-561MC-B Datasheet

SimilarRFQ

SRR0735A-561M

Bourns Inc.In Stock: 4036SRR0735A-561M Datasheet

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SRR0745A-561M

Bourns Inc.In Stock: 3954SRR0745A-561M Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SPD73-564M is determined by strict equivalence across the following critical parameters:

Primary Matching Criteria:

• Inductance value: 560 µH at 1 kHz test frequency
• Inductance tolerance: ±20%
• Core material: Ferrite
• Shielding configuration: Shielded
• Mounting type: Surface Mount
• Physical footprint: 7.30 mm × 7.30 mm base dimensions

Secondary Compatibility Parameters:

• Current rating must equal or exceed 222 mA
• DC resistance must not exceed 4.67 Ohm maximum
• Operating temperature range must encompass or extend the original -55°C to 125°C specification
• Package classification: Nonstandard

All three substitute parts meet these criteria while maintaining identical inductance specifications and core geometry. Variations in current saturation ratings, DC resistance values, and height dimensions reflect design improvements in active production alternatives.

Parameter Comparison

Engineering Selection Recommendations

CDRH73NP-561MC-B (Sumida America Components Inc.): This substitute provides direct parameter equivalence with matching current rating (220 mA) and DC resistance (4.67 Ohm maximum). The part is actively manufactured and ROHS3 compliant. The operating temperature range is restricted to -40°C to 100°C, which does not extend to the original -55°C lower limit. Selection of this part requires confirmation that the application does not require operation below -40°C.

SRR0735A-561M (Bourns Inc.): This substitute exceeds the original current rating specification (230 mA versus 222 mA) and provides improved DC resistance performance (3.5 Ohm maximum versus 4.67 Ohm). The part maintains the full operating temperature range (-40°C to 125°C) and carries AEC-Q200 automotive qualification. ROHS3 compliance is confirmed. This part is suitable for direct substitution in applications where the lower DC resistance is acceptable.

SRR0745A-561M (Bourns Inc.): This substitute provides the highest current rating (260 mA) and lowest DC resistance (2.6 Ohm maximum) among available alternatives. The part maintains the full operating temperature range (-40°C to 125°C) and carries AEC-Q200 automotive qualification. ROHS3 compliance is confirmed. The maximum height is 4.70 mm, which exceeds the original 3.90 mm dimension. Physical clearance verification is required before selection.

Frequently Asked Questions (FAQ)

Q: Can the CDRH73NP-561MC-B be used in applications requiring -55°C operation?

A: No. The CDRH73NP-561MC-B operating temperature range is -40°C to 100°C. The original SPD73-564M specifies -55°C to 125°C. Applications requiring operation at -55°C must use either SRR0735A-561M or SRR0745A-561M, both rated to -40°C to 125°C.

Q: What is the significance of the DC resistance differences between substitutes?

A: DC resistance directly affects power dissipation and thermal performance. The SRR0745A-561M (2.6 Ohm) dissipates less power than the original SPD73-564M (4.67 Ohm) at identical current levels. This represents an improvement in efficiency. The SRR0735A-561M (3.5 Ohm) provides intermediate performance. Selection depends on thermal budget requirements of the application.

Q: Are all substitute parts physically compatible with the original PCB footprint?

A: All substitutes maintain the identical 7.30 mm × 7.30 mm base footprint. Height dimensions vary: CDRH73NP-561MC-B (3.40 mm), SRR0735A-561M (3.70 mm), and SRR0745A-561M (4.70 mm) compared to the original 3.90 mm. Verify clearance above the component before final selection, particularly for the SRR0745A-561M.

Q: What compliance advantages do the active substitutes offer?

A: All three substitute parts are ROHS3 compliant, whereas the original SPD73-564M is non-compliant. The Bourns parts (SRR0735A-561M and SRR0745A-561M) carry AEC-Q200 automotive qualification, providing additional reliability documentation for automotive and high-reliability applications.

Q: Can current rating be exceeded in the substitute parts?

A: No. Current rating represents the maximum continuous current at which the inductor operates within specified performance parameters. Exceeding the rated current causes saturation and performance degradation. The substitute parts have higher current ratings than the original, providing design margin but not permitting operation above their individual ratings.

Q: Is packaging format a consideration for substitution?

A: Yes. The original SPD73-564M packaging is listed as nonstandard. All substitutes are supplied in Tape & Reel (TR) format, which is standard for surface mount production. Verify that assembly equipment and processes are compatible with TR packaging before final selection.