SPD73R-683M Equivalent & Substitute Parts

Part Overview

The SPD73R-683M is a 68 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., designed for surface mount applications. This component operates at 1.05 A maximum current with a DC resistance of 520 mOhm maximum and is rated for operating temperatures from -55°C to 125°C. The part is ROHS3 compliant and carries an active product status. Substitute parts are identified when equivalent inductance values, current ratings, shielding characteristics, and package dimensions align within acceptable engineering tolerances, enabling component interchangeability in circuit designs where the original part may be unavailable or inventory constraints exist.

Substiute Parts

SPD73R-683M

API Delevan Inc.In Stock: 1090SPD73R-683M Datasheet

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SRR0745A-680M

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

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SPD73R-683M is determined by strict alignment of the following critical parameters:

Inductance Value: Both the main part and substitute must maintain 68 µH inductance at ±20% tolerance, measured at 1 kHz test frequency.

Shielding Configuration: The substitute must be shielded to maintain electromagnetic isolation equivalent to the original design.

Core Material: Ferrite core material is required to ensure magnetic performance consistency.

Current Handling Capability: The substitute current rating must support the circuit's maximum operating current. The SPD73R-683M operates at 1.05 A; substitutes with lower current ratings (such as 860 mA) are acceptable only when circuit current demand does not exceed the substitute's saturation current specification.

DC Resistance: The substitute's DCR must not exceed the original specification to prevent excessive power dissipation and thermal effects in the circuit.

Package Dimensions: Surface mount footprint and height must be compatible with the PCB layout. The 7.30mm x 7.30mm footprint is maintained across qualified substitutes.

Mounting Type: Surface mount configuration is required for PCB assembly compatibility.

Environmental Compliance: RoHS3 compliance and MSL rating must be maintained.

The SRR0745A-680M from Bourns Inc. qualifies as a substitute based on these parameters.

Parameter Comparison

Engineering Selection Recommendations

Primary Consideration - Current Rating: The SRR0745A-680M substitute is rated at 860 mA continuous current with 960 mA saturation current, compared to the SPD73R-683M at 1.05 A. Selection of the substitute is appropriate only when the circuit's maximum operating current remains below 860 mA. For applications requiring the full 1.05 A capability of the original part, the SPD73R-683M must be retained.

DC Resistance Advantage: The SRR0745A-680M exhibits superior DC resistance performance at 300 mOhm maximum versus 520 mOhm maximum for the SPD73R-683M. This lower resistance reduces power dissipation and thermal generation, providing a performance benefit in applications where power efficiency is a design consideration.

Height Clearance: The substitute part measures 4.70mm seated height compared to 3.90mm for the original. PCB layout must accommodate this 0.8mm height difference to ensure no mechanical interference with adjacent components or enclosure constraints.

Temperature Range: The SRR0745A-680M operates from -40°C to 125°C, narrower than the SPD73R-683M range of -55°C to 125°C. The substitute is suitable for applications where the minimum operating temperature does not fall below -40°C.

Compliance Status: Both parts maintain ROHS3 compliance, MSL Level 1 rating, and identical inductance specifications at 1 kHz test frequency. The Bourns SRR0745A-680M carries AEC-Q200 automotive qualification, providing additional reliability assurance for applications requiring automotive-grade components.

Inventory Availability: The SRR0745A-680M maintains higher inventory levels (3400 pcs) compared to the SPD73R-683M (986 pcs), supporting supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the SRR0745A-680M directly replace the SPD73R-683M in all applications?

A: Direct replacement is conditional. The substitute's 860 mA current rating is lower than the original's 1.05 A specification. Replacement is valid only when circuit maximum operating current does not exceed 860 mA. Additionally, the substitute's minimum operating temperature is -40°C versus -55°C for the original; applications requiring operation below -40°C must use the SPD73R-683M.

Q: What is the significance of the 0.8mm height difference between these parts?

A: The SRR0745A-680M measures 4.70mm seated height compared to 3.90mm for the SPD73R-683M. PCB layout must be verified to ensure no mechanical collision with adjacent components, solder mask features, or enclosure boundaries. Height-constrained designs may require the original part.

Q: Are both parts suitable for automated assembly?

A: Yes. Both parts are supplied in Tape & Reel (TR) packaging and are configured for surface mount assembly. Reel specifications and tape pitch must be confirmed with the respective manufacturers for pick-and-place equipment compatibility.

Q: How do the DC resistance values affect circuit performance?

A: The SRR0745A-680M's 300 mOhm maximum DCR is lower than the SPD73R-683M's 520 mOhm maximum. Lower resistance reduces I²R power dissipation in the inductor. For a 1 A current, the original part dissipates up to 520 mW while the substitute dissipates up to 300 mW. This difference is significant in power-sensitive applications.

Q: What compliance certifications apply to each part?

A: Both parts are ROHS3 compliant with MSL Level 1 (unlimited moisture sensitivity). The SRR0745A-680M additionally carries AEC-Q200 automotive qualification. Both parts are REACH unaffected and classified as EAR99 for export control purposes.

Q: Can inductance value be verified after component installation?

A: Inductance is specified at 1 kHz test frequency for both parts. Measurement equipment capable of 1 kHz inductance testing is required for verification. Both parts maintain ±20% tolerance, establishing acceptable measurement ranges of 54.4 µH to 81.6 µH.

Q: What is the saturation current specification and why does it matter?

A: Saturation current (Isat) represents the current level at which the inductor's inductance begins to degrade due to core saturation. The SPD73R-683M saturates at 1.05 A while the SRR0745A-680M saturates at 960 mA. Operating above saturation current causes inductance loss and potential circuit malfunction. Circuit design must ensure operating current remains below the selected part's Isat specification.