DRA73-681-R Equivalent & Substitute Parts

Part Overview

The DRA73-681-R is a 680 µH shielded wirewound inductor manufactured by Eaton - Electronics Division, designed for surface mount applications requiring moderate current handling and low DC resistance. This component is rated for 270 mA continuous current with a saturation current of 297 mA and operates across an extended temperature range of -40°C to 165°C. The part maintains Active product status and carries AEC-Q200 qualification, making it suitable for automotive and industrial applications. Equivalent parts are identified to support design flexibility, supply chain continuity, and application-specific performance requirements where the primary part may be unavailable or where alternative electrical characteristics better suit specific circuit demands.

Substiute Parts

DRA73-681-R

Eaton - Electronics DivisionIn Stock: 1106DRA73-681-R Datasheet

Current PartRFQ

SRR0735A-681M

Bourns Inc.In Stock: 6572SRR0735A-681M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DRA73-681-R is determined by strict alignment with the following critical parameters:

Inductance Value: The substitute part must provide 680 µH inductance with ±20% tolerance to maintain circuit functionality and frequency response characteristics.

Current Handling: The substitute must support the application's current requirements. The DRA73-681-R is rated for 270 mA continuous current with 297 mA saturation current. Substitutes with lower current ratings are not acceptable for applications requiring the full 270 mA specification.

DC Resistance: The DCR of 3.89 Ohm directly impacts power dissipation and thermal performance. Substitutes with significantly higher DCR values will increase heat generation and may require thermal management reassessment.

Shielding: Both the main part and substitute must be shielded to maintain electromagnetic compatibility and prevent interference in sensitive circuit environments.

Operating Temperature Range: The substitute must support the full -40°C to 165°C operating range or a range that encompasses the application's actual operating conditions.

Mounting and Package: Surface mount compatibility and physical dimensions must accommodate the PCB layout and assembly process constraints.

Compliance Standards: AEC-Q200 qualification and RoHS3 compliance are mandatory for automotive and regulated applications.

The SRR0735A-681M from Bourns Inc. is identified as an equivalent substitute based on matching inductance value, shielding requirement, surface mount configuration, and compliance certifications, with documented differences in current rating and operating temperature range that must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Primary Consideration - Current Requirements: The DRA73-681-R supports 270 mA continuous current, while the SRR0735A-681M is rated for 210 mA. Selection between these parts must be based on the actual circuit current demand. If the application requires sustained current above 210 mA, the DRA73-681-R is the only acceptable choice. For applications operating at or below 210 mA, the SRR0735A-681M is electrically compatible.

Temperature Operating Range: The DRA73-681-R operates to 165°C, providing a 40°C advantage over the SRR0735A-681M maximum of 125°C. Applications requiring operation above 125°C must use the DRA73-681-R. For applications with maximum operating temperatures at or below 125°C, both parts are suitable.

Physical Footprint: The SRR0735A-681M has a slightly smaller footprint (7.30 x 7.30 mm versus 7.60 x 7.60 mm) but is 0.15 mm taller. Both dimensions are within typical PCB design tolerances. Verify that the substitute's height does not violate clearance constraints in the specific application.

Compliance and Qualification: Both parts carry AEC-Q200 automotive qualification and ROHS3 compliance, making them suitable for regulated applications without additional qualification burden.

DC Resistance and Thermal Performance: The SRR0735A-681M DCR of 4 Ohm Max is marginally higher than the DRA73-681-R at 3.89 Ohm. This represents approximately 2.8% additional resistance, resulting in proportionally higher power dissipation. For applications with tight thermal budgets, the lower DCR of the DRA73-681-R may be preferable.

Inductance Test Frequency Difference: The DRA73-681-R is tested at 100 kHz while the SRR0735A-681M is tested at 1 kHz. Both parts are specified at 680 µH with ±20% tolerance. For applications operating at frequencies significantly different from the test frequency, frequency-dependent inductance variation should be evaluated against the tolerance specification.

Frequently Asked Questions (FAQ)

Q: Can the SRR0735A-681M directly replace the DRA73-681-R in all applications?

A: Direct substitution is not universal. The SRR0735A-681M has lower current rating (210 mA versus 270 mA) and lower maximum operating temperature (125°C versus 165°C). Substitution is valid only when the application's actual current demand does not exceed 210 mA and the operating temperature remains at or below 125°C.

Q: What is the impact of the 60 mA current rating difference?

A: The DRA73-681-R supports 60 mA higher continuous current. If the circuit draws more than 210 mA, the SRR0735A-681M will operate outside its rated specification, risking inductor saturation, excessive heating, and potential failure. Verify actual circuit current before substitution.

Q: How does the saturation current difference affect circuit performance?

A: The DRA73-681-R has 297 mA saturation current versus 220 mA for the SRR0735A-681M. Saturation represents the current level at which inductance begins to degrade significantly. The 77 mA difference means the Bourns part has less margin before saturation effects occur. For circuits with current transients or peak currents, this reduced margin must be considered.

Q: Are the physical dimensions compatible with existing PCB layouts?

A: The SRR0735A-681M footprint is 0.30 mm smaller in length and width but 0.15 mm taller. The smaller footprint is backward compatible with layouts designed for the DRA73-681-R. However, verify that the increased height (3.70 mm versus 3.55 mm) does not violate clearance constraints above the component.

Q: Do both parts meet automotive qualification requirements?

A: Yes. Both the DRA73-681-R and SRR0735A-681M carry AEC-Q200 qualification and ROHS3 compliance, making them suitable for automotive and regulated applications without additional qualification testing.

Q: Why are the inductance test frequencies different?

A: The DRA73-681-R is tested at 100 kHz while the SRR0735A-681M is tested at 1 kHz. Both parts are specified at 680 µH with ±20% tolerance. The inductance value may vary slightly at different frequencies due to core material properties. Both specifications are valid within their respective test conditions and tolerance ranges.

Q: What should be verified before substituting the SRR0735A-681M for the DRA73-681-R?

A: Verify three critical parameters: (1) Circuit continuous current does not exceed 210 mA; (2) Maximum operating temperature does not exceed 125°C; (3) PCB clearance accommodates the 3.70 mm maximum height. If all three conditions are met, substitution is electrically and mechanically compatible.

Q: Is the slightly higher DC resistance of the SRR0735A-681M a concern?

A: The 4 Ohm Max DCR of the SRR0735A-681M versus 3.89 Ohm of the DRA73-681-R represents approximately 2.8% additional resistance. For most applications, this difference is negligible. However, in circuits with tight thermal budgets or high continuous current operation, the lower DCR of the DRA73-681-R may be preferable to minimize power dissipation.