SPD73-474M Equivalent & Substitute Parts

Part Overview

The SPD73-474M is a 470 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 235 mA with a maximum DC resistance of 4.18 Ohm. This part is classified as obsolete, necessitating the identification of active substitute components that maintain electrical and mechanical compatibility. Equivalent substitutes must meet or exceed the core electrical specifications while maintaining the same package footprint and shielding characteristics required for surface mount applications.

Substiute Parts

SPD73-474M

API Delevan Inc.In Stock: 939SPD73-474M Datasheet

Current PartRFQ

CDRH73NP-471MC-B

Sumida America Components Inc.In Stock: 950CDRH73NP-471MC-B Datasheet

SimilarRFQ

SRR0745A-471M

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SPD73-474M is determined by the following key parameters:

• Inductance Value: Must be 470 µH with ±20% tolerance
• Current Rating: Must be capable of handling at least 235 mA
• DC Resistance: Must not exceed 4.18 Ohm max to maintain circuit performance
• Core Material: Must be ferrite to ensure equivalent magnetic properties
• Shielding: Must be shielded to prevent electromagnetic interference
• Mounting Type: Must be surface mount compatible
• Package Footprint: Must maintain 0.287" L x 0.287" W (7.30mm x 7.30mm) dimensions

Two active substitutes meet these electrical and mechanical criteria: CDRH73NP-471MC-B from Sumida America Components Inc. and SRR0745A-471M from Bourns Inc.

Parameter Comparison

Engineering Selection Recommendations

CDRH73NP-471MC-B is suitable for applications where the operating temperature range does not exceed 100°C and RoHS3 compliance is required. This part maintains identical inductance and DC resistance specifications while offering improved component availability as an active product. The slightly reduced height (3.40mm vs 3.90mm) may provide advantages in space-constrained designs.

SRR0745A-471M is recommended for applications requiring the extended operating temperature range (-40°C ~ 125°C) and superior DC resistance performance (2.2 Ohm vs 4.18 Ohm). The higher current rating (290 mA vs 235 mA) and AEC-Q200 qualification provide additional margins for automotive or industrial applications. Increased height (4.70mm) must be considered in board-level layout planning.

Both substitutes are RoHS3 compliant and REACH unaffected, supporting environmental compliance requirements. Part selection should prioritize thermal operating range and DC resistance performance relative to circuit design parameters.

Frequently Asked Questions (FAQ)

Q: Can CDRH73NP-471MC-B be used in place of SPD73-474M in all applications? A: CDRH73NP-471MC-B is compatible with applications operating at or below 100°C. If the circuit requires operation above 100°C, SRR0745A-471M must be used to maintain the extended temperature range to 125°C.

Q: What is the impact of different DC resistance values between substitutes? A: SRR0745A-471M exhibits lower DC resistance (2.2 Ohm vs 4.18 Ohm), resulting in reduced resistive losses and lower power dissipation in the inductor. This reduces heat generation and may improve overall circuit efficiency. For legacy circuit designs, verify that the lower resistance does not alter circuit behavior.

Q: How does height variation affect PCB layout compatibility? A: The three parts have different seated heights: SPD73-474M (3.90mm), CDRH73NP-471MC-B (3.40mm), and SRR0745A-471M (4.70mm). All share identical lateral footprints (7.30mm x 7.30mm). Clearance for adjacent components and cover requirements must be evaluated for designs with height-sensitive constraints.

Q: Are both substitutes available in tape and reel packaging? A: Yes, both CDRH73NP-471MC-B and SRR0745A-471M are supplied in Tape & Reel (TR) packaging, supporting high-volume manufacturing processes and automated assembly.

Q: Why is SRR0745A-471M rated for higher current despite the same inductance? A: SRR0745A-471M achieves 290 mA rating through superior wire gauge and core design optimization, enabling higher current handling with lower DC resistance. The AEC-Q200 automotive qualification indicates design robustness for demanding operating conditions.