SPD73R-105M Equivalent & Substitute Parts

Part Overview

The SPD73R-105M is a 1 mH shielded drum core wirewound inductor manufactured by API Delevan Inc., designed for surface mount applications with a current rating of 260 mA and maximum DC resistance of 9.44 Ohm. This component is classified as Active product status and is RoHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances for the application.

Substiute Parts

SPD73R-105M

API Delevan Inc.In Stock: 869SPD73R-105M Datasheet

Current PartRFQ

SRR0745A-102M

Bourns Inc.In Stock: 6506SRR0745A-102M Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SPD73R-105M are identified based on strict equivalence of the following critical parameters:

Electrical Equivalence Criteria:

• Inductance value: 1 mH (within ±20% tolerance specification)
• Inductance tolerance: ±20%
• Core material: Ferrite shielded construction
• Shielding type: Shielded

Mechanical Compatibility Criteria:

• Mounting type: Surface Mount
• Package dimensions: 7.30 mm x 7.30 mm footprint
• Height compatibility: Maximum seated height within acceptable PCB assembly clearance

Performance Criteria:

• Current rating must support the application requirement
• DC resistance must be acceptable for the circuit design
• Operating temperature range must encompass application environment

Compliance Criteria:

• RoHS3 compliance status
• Moisture Sensitivity Level: 1 (Unlimited)

The SRR0745A-102M from Bourns Inc. qualifies as a substitute based on matching inductance value, ferrite core material, shielded construction, identical footprint dimensions, surface mount compatibility, and equivalent compliance certifications. Differences in current rating and DC resistance must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

SPD73R-105M Selection Criteria:

• Applications requiring current rating of 260 mA or higher
• Circuits where lower DC resistance (9.44 Ohm maximum) is critical for power efficiency
• Systems operating at temperatures below -40°C (down to -55°C minimum)
• Active product status with established supply chain (813 Pcs inventory)

SRR0745A-102M Selection Criteria:

• Applications with current requirements up to 200 mA
• Circuits where lower DC resistance (4.1 Ohm maximum) provides improved efficiency
• Operating temperature range of -40°C to 125°C is acceptable
• AEC-Q200 automotive qualification requirement
• Higher inventory availability (6400 Pcs) supports volume production
• Reduced height profile (4.70 mm vs 3.90 mm) acceptable for PCB assembly

Substitution Feasibility: Both components maintain identical inductance value, tolerance, core material, shielding type, and footprint dimensions. The SRR0745A-102M is suitable as a substitute when the application current requirement does not exceed 200 mA and the operating temperature minimum is not below -40°C. The lower DC resistance of the SRR0745A-102M may provide circuit performance benefits in applications where power dissipation is a consideration.

Frequently Asked Questions (FAQ)

Q: Can SRR0745A-102M replace SPD73R-105M in all applications?

A: No. The SRR0745A-102M has a lower current rating (200 mA vs 260 mA) and lower saturation current (240 mA vs 260 mA). Substitution is valid only when the application current requirement does not exceed 200 mA. Additionally, the SRR0745A-102M operating temperature minimum is -40°C, compared to -55°C for the SPD73R-105M, so applications requiring operation below -40°C require the original part.

Q: Are the physical dimensions compatible for PCB assembly?

A: The footprint dimensions are identical at 7.30 mm x 7.30 mm for both parts. The seated height differs: SPD73R-105M is 3.90 mm maximum, while SRR0745A-102M is 4.70 mm maximum. This 0.80 mm height difference must be evaluated against PCB assembly clearance requirements and component placement constraints.

Q: What is the significance of the DC resistance difference?

A: The SPD73R-105M has a maximum DC resistance of 9.44 Ohm, while the SRR0745A-102M has 4.1 Ohm maximum. Lower DC resistance reduces power dissipation and heat generation in the inductor. The SRR0745A-102M provides superior efficiency characteristics in this parameter. Circuit design must account for the resistance value when calculating voltage drops and power losses.

Q: Do both parts meet the same compliance standards?

A: Both parts are RoHS3 compliant and have Moisture Sensitivity Level 1 (Unlimited). The SRR0745A-102M carries additional AEC-Q200 automotive qualification. Both parts are REACH unaffected and classified as EAR99 for export control purposes.

Q: What is the inductance tolerance and how does it affect substitution?

A: Both parts specify ±20% inductance tolerance at 1 kHz test frequency. This means the actual inductance value can range from 0.8 mH to 1.2 mH for both components. Circuit designs must account for this tolerance range. The matching tolerance specification supports direct substitution from an inductance accuracy perspective.

Q: Are there inventory considerations for part selection?

A: The SPD73R-105M has 813 pieces in stock, while the SRR0745A-102M has 6400 pieces available. For high-volume production or long-term supply assurance, the SRR0745A-102M offers greater inventory availability. For immediate requirements with lower volumes, both parts are available as new original stock.