SPD73R-684M Equivalent & Substitute Parts

Part Overview

The SPD73R-684M is a 680 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., designed for surface mount applications with a current rating of 310 mA and maximum DC resistance of 5.73 Ohm. This component operates across the temperature range of -55°C to 125°C and is classified as Active product status with ROHS3 compliance.

Substitute parts are identified when equivalent inductance values, current ratings, and physical dimensions align within acceptable tolerance specifications, enabling direct replacement in circuit designs without functional degradation.

Substiute Parts

SPD73R-684M

API Delevan Inc.In Stock: 706SPD73R-684M Datasheet

Current PartRFQ

SRR0745A-681M

Bourns Inc.In Stock: 1278SRR0745A-681M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SPD73R-684M is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 680 µH (matching specification)
• Inductance tolerance: ±20% (matching specification)
• Shielding type: Shielded (matching specification)
• Core material: Ferrite (matching specification)
• Mounting type: Surface Mount (matching specification)
• Package footprint: 7.30mm x 7.30mm (matching specification)

Secondary Compatibility Factors:

• Current rating must meet or exceed circuit requirements
• DC resistance must be acceptable for application thermal and efficiency constraints
• Operating temperature range must encompass application environment
• RoHS and REACH compliance status must satisfy regulatory requirements

The substitute part SRR0745A-681M from Bourns Inc. satisfies all primary matching criteria with identical inductance, tolerance, shielding, core material, and footprint dimensions. Secondary parameters show variations in current rating (240 mA vs. 310 mA), DC resistance (2.8 Ohm vs. 5.73 Ohm), and operating temperature range (-40°C to 125°C vs. -55°C to 125°C).

Parameter Comparison

Engineering Selection Recommendations

SPD73R-684M Selection Criteria:

• Applications requiring current ratings up to 310 mA
• Operating environments with minimum temperature requirements below -40°C
• Circuits where higher DC resistance (5.73 Ohm) is acceptable
• Designs requiring extended low-temperature performance to -55°C

SRR0745A-681M Selection Criteria:

• Applications with current requirements up to 240 mA
• Operating environments with minimum temperature of -40°C or higher
• Circuits benefiting from lower DC resistance (2.8 Ohm) for reduced power dissipation
• Designs with AEC-Q200 automotive qualification requirement
• Applications where height constraint of 4.70mm maximum is acceptable

Both parts maintain Active product status and ROHS3 compliance, ensuring continued availability and regulatory conformance. The Bourns SRR0745A-681M provides superior DC resistance characteristics, while the API Delevan SPD73R-684M offers higher current capacity and extended low-temperature operation.

Frequently Asked Questions (FAQ)

Q: Can SRR0745A-681M replace SPD73R-684M in all applications?

A: Substitution is valid only when circuit current requirements do not exceed 240 mA and operating temperature remains above -40°C. Applications requiring the full 310 mA current rating or -55°C minimum temperature operation require the original SPD73R-684M.

Q: What is the impact of different DC resistance values?

A: The SRR0745A-681M exhibits 2.8 Ohm maximum DC resistance compared to 5.73 Ohm for the SPD73R-684M. Lower resistance reduces power dissipation and heat generation. Circuit designs must account for this difference in thermal calculations and efficiency analysis.

Q: Are the physical dimensions compatible?

A: Both parts share identical footprint dimensions of 7.30mm x 7.30mm. The SRR0745A-681M has a maximum seated height of 4.70mm versus 3.90mm for the SPD73R-684M. PCB layout and component clearance must accommodate the 0.80mm height difference.

Q: Do both parts meet the same compliance standards?

A: Both SPD73R-684M and SRR0745A-681M are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited). The SRR0745A-681M carries additional AEC-Q200 automotive qualification. REACH status is unaffected for both parts.

Q: What determines substitution eligibility?

A: Substitution requires matching inductance (680 µH), tolerance (±20%), shielding type (Shielded), core material (Ferrite), mounting type (Surface Mount), and footprint (7.30mm x 7.30mm). Secondary parameters including current rating, DC resistance, and temperature range must be evaluated against specific application requirements.

Q: Can the SPD73R-684M be used as a substitute for SRR0745A-681M?

A: Yes, the SPD73R-684M can substitute for SRR0745A-681M in applications where higher current capacity (310 mA vs. 240 mA) and extended temperature range (-55°C to 125°C) are not detrimental. The higher DC resistance of 5.73 Ohm must be acceptable for the circuit design.