SPD73-683M Equivalent & Substitute Parts

Part Overview

The SPD73-683M is a 68 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 1.05 A with a maximum DC resistance of 520 mOhm. This component is currently obsolete, making identification of suitable substitute parts essential for design continuity and system maintenance. The part operates across the temperature range of -55°C to 125°C and is packaged in a nonstandard surface mount configuration with dimensions of 7.30mm × 7.30mm × 3.90mm (max height).

Substiute Parts

SPD73-683M

API Delevan Inc.In Stock: 942SPD73-683M Datasheet

Current PartRFQ

SRR0745A-680M

Bourns Inc.In Stock: 3438SRR0745A-680M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SPD73-683M is determined by the following critical parameters:

• Inductance Value: 68 µH (fixed requirement)
• Inductance Tolerance: ±20% (defines acceptable deviation)
• Shielding Configuration: Shielded (electromagnetic containment requirement)
• Core Material: Ferrite (performance characteristic)
• Current Rating: Minimum 1.05 A (load capacity requirement)
• DC Resistance: Maximum 520 mOhm preferred but 300 mOhm acceptable (lower resistance is beneficial)
• Saturation Current (Isat): Minimum 1.05 A (defines operational limits)
• Physical Footprint: 7.30mm × 7.30mm surface mount package
• Mounting Type: Surface mount (assembly compatibility)
• Inductance Test Frequency: 1 kHz (measurement standard)

The SRR0745A-680M by Bourns Inc. qualifies as a suitable substitute based on matching inductance, shielding, ferrite core, surface mount configuration, and equivalent physical footprint.

Parameter Comparison

Engineering Selection Recommendations

The SRR0745A-680M represents an active product alternative to the obsolete SPD73-683M. Both components feature identical inductance values, matching tolerance specifications, ferrite core construction, and equivalent surface mount footprints. The Bourns substitute offers improved current saturation performance (960 mA vs. 1.05 A rating differential) and significantly lower DC resistance (300 mOhm vs. 520 mOhm), both of which represent advantageous characteristics in typical inductive load applications.

The SRR0745A-680M carries ROHS3 compliance and AEC-Q200 qualification, providing compliance benefits and automotive-grade reliability certifications not present in the original API Delevan component. The component height differential of 0.80mm (4.70mm vs. 3.90mm maximum seated height) must be evaluated for PCB layout constraints in space-limited designs.

The operating temperature lower limit differs by 15°C (-40°C vs. -55°C). Applications requiring operation below -40°C necessitate retention of the original part specification or identification of alternative sources.

Frequently Asked Questions (FAQ)

Q: Can the SRR0745A-680M directly replace the SPD73-683M in all applications? A: The SRR0745A-680M provides equivalent inductance and core configuration with improved DC resistance characteristics. The 860 mA current rating and 960 mA saturation point are lower than the original 1.05 A specification; substitution is valid only when application current demands remain below 860 mA. The reduced operating temperature minimum (-40°C vs. -55°C) must be evaluated for low-temperature operating environments.

Q: What are the critical differences between these parts? A: The primary differences are current rating capacity (1.05 A vs. 860 mA), DC resistance (520 mOhm vs. 300 mOhm), physical height (3.90mm vs. 4.70mm), temperature operating range minimum (-55°C vs. -40°C), and compliance status. The Bourns part provides superior DC resistance performance and active product status with modern compliance certifications.

Q: Does the height differential affect PCB assembly? A: The 0.80mm height increase (4.70mm vs. 3.90mm maximum seated height) may impact designs with tight vertical clearance constraints. PCB layout validation is necessary for space-constrained applications, particularly in multi-layer assemblies with component density limitations.

Q: Are RoHS and AEC-Q200 certifications important for my application? A: ROHS3 compliance and AEC-Q200 automotive-grade certification apply to specific regulatory and reliability requirements. Applications subject to automotive, medical device, or regulatory compliance mandates benefit from the Bourns component's certifications. Commercial and industrial applications may operate with non-compliant components based on system requirements.

Q: How does DC resistance affect circuit performance? A: Lower DC resistance (300 mOhm vs. 520 mOhm) reduces resistive power dissipation and heat generation in the inductor. The Bourns component's improved resistance profile produces beneficial effects on thermal performance and circuit efficiency in applications with sustained current flow.