PD73R-392M Equivalent & Substitute Parts

Part Overview

The PD73R-392M is a 3.9 µH unshielded drum core wirewound inductor manufactured by API Delevan Inc., designed for surface mount applications with a current rating of 2.3 A and maximum DC resistance of 55 mOhm. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The part operates across the temperature range of -55°C to 125°C and maintains ROHS3 compliance.

Substiute Parts

PD73R-392M

API Delevan Inc.In Stock: 851PD73R-392M Datasheet

Current PartRFQ

SDR0805-3R9ML

Bourns Inc.In Stock: 5138SDR0805-3R9ML Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the PD73R-392M is determined by the following critical parameters:

• Inductance Value: Must be 3.9 µH with ±20% tolerance
• Core Type: Ferrite drum core, wirewound construction
• Shielding Configuration: Unshielded
• Mounting Technology: Surface mount
• Current Handling: Minimum 2.3 A rating required
• DC Resistance: Lower values are acceptable; higher values may impact circuit performance
• Compliance: ROHS3 compliance required

The SDR0805-3R9ML from Bourns Inc. meets all substitution criteria. This part maintains identical inductance specifications, core material, shielding type, and mounting configuration while offering superior electrical performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The SDR0805-3R9ML is the qualified substitute for the PD73R-392M based on the following factors:

• Product Status Alignment: The substitute is active production status, ensuring long-term availability and supply chain stability compared to the obsolete main part.
• Compliance Certification: Both parts maintain ROHS3 compliance and identical moisture sensitivity ratings, supporting regulatory requirements.
• Electrical Performance: The substitute provides enhanced current handling capacity (4.4 A versus 2.3 A) and reduced DC resistance (20 mOhm versus 55 mOhm), delivering improved thermal performance and lower power dissipation in equivalent circuit applications.
• Core Specifications: Identical inductance value, tolerance, core material, and shielding configuration ensure functional equivalence in circuit operation.

Frequently Asked Questions (FAQ)

Q: Can the SDR0805-3R9ML directly replace the PD73R-392M in existing designs?

A: Yes. Both parts share identical inductance values (3.9 µH), tolerance specifications (±20%), core material (ferrite), shielding configuration (unshielded), and surface mount technology. The substitute meets or exceeds all electrical requirements of the original part.

Q: What are the physical dimension differences between these parts?

A: The PD73R-392M measures 0.303" L × 0.272" W × 0.138" H (7.70mm × 6.91mm × 4.60mm). The SDR0805-3R9ML measures 0.307" L × 0.307" W × 0.209" H (7.80mm × 7.80mm × 5.30mm). These dimensional variations require PCB layout verification before implementation.

Q: Does the lower DC resistance of the substitute part affect circuit behavior?

A: The SDR0805-3R9ML exhibits 20 mOhm maximum DC resistance compared to 55 mOhm for the original part. Lower DC resistance reduces power dissipation and heat generation, which is beneficial for circuit performance. No negative effects are introduced by this parameter difference.

Q: What is the packaging difference between these parts?

A: The PD73R-392M packaging is listed as nonstandard. The SDR0805-3R9ML is supplied in Tape & Reel (TR) format, which is standard for high-volume surface mount production.

Q: Are there temperature range considerations for substitution?

A: The PD73R-392M operates from -55°C to 125°C, while the SDR0805-3R9ML operates from -40°C to 125°C. If your application requires operation below -40°C, the original part specification must be maintained. For standard industrial and commercial temperature ranges, the substitute is fully compatible.