Würth Elektronik 7440650082 Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 7440650082 is an 8.2 µH shielded drum core wirewound inductor rated for 3.8 A continuous current with a maximum DC resistance of 37 mOhm. This surface mount component operates across the temperature range of -40°C to 125°C and is designed for applications requiring stable inductance performance at 100 kHz test frequency. The part is currently active in production and maintains full RoHS3 compliance. Substitute parts are identified when equivalent electrical and mechanical specifications can satisfy the same circuit requirements while maintaining compatibility with the mounting footprint and thermal environment.

Key Parameters

Parameter	Value
Inductance	8.2 µH
Inductance Tolerance	±30%
Current Rating	3.8 A
Saturation Current (Isat)	2.8 A
DC Resistance (DCR)	37 mOhm Max
Core Material	Ferrite
Shielding	Shielded
Self Resonant Frequency	28 MHz
Operating Temperature Range	-40°C to 125°C
Mounting Type	Surface Mount
Package Dimensions	10.00 mm × 10.00 mm × 3.10 mm (Max Height)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	MSL 1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 7440650082 is determined by the following critical parameters:

Inductance Value: Must be 8.2 µH with ±30% tolerance to maintain circuit resonance and filtering characteristics
Current Rating: Minimum 3.8 A continuous current capability required for load compatibility
DC Resistance: Maximum 37 mOhm to ensure acceptable power dissipation and thermal performance
Core Type and Shielding: Ferrite core with shielding required to maintain electromagnetic isolation and frequency response
Package Footprint: 10.00 mm × 10.00 mm surface mount package with maximum seated height of 3.10 mm for PCB layout compatibility
Operating Temperature: -40°C to 125°C range to support the intended thermal environment
Compliance: RoHS3 compliance and MSL 1 rating required for manufacturing and environmental standards

The Bourns SRU1028-8R2Y meets these substitution criteria with equivalent inductance, core material, shielding, package dimensions, temperature range, and compliance certifications.

Parameter Comparison

Parameter	Würth Elektronik 7440650082	Bourns SRU1028-8R2Y	Compatibility
Inductance	8.2 µH	8.2 µH	Identical
Inductance Tolerance	±30%	±30%	Identical
Current Rating (Amps)	3.8 A	3.3 A	Substitute rated lower; verify application current requirements
Saturation Current (Isat)	2.8 A	2.7 A	Comparable
DC Resistance (DCR)	37 mOhm Max	28 mOhm	Substitute has lower resistance; improved performance
Core Material	Ferrite	Ferrite	Identical
Shielding	Shielded	Shielded	Identical
Self Resonant Frequency	28 MHz	28 MHz	Identical
Operating Temperature Range	-40°C to 125°C	-40°C to 125°C	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Package Dimensions	10.00 mm × 10.00 mm × 3.10 mm	10.00 mm × 10.00 mm × 3.10 mm	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Moisture Sensitivity Level	MSL 1 (Unlimited)	MSL 1 (Unlimited)	Identical

Engineering Selection Recommendations

The Bourns SRU1028-8R2Y qualifies as a direct substitute for the Würth Elektronik 7440650082 based on matching electrical specifications, identical package footprint, and equivalent compliance certifications. Both components are active products with RoHS3 compliance and MSL 1 ratings, ensuring manufacturing compatibility and environmental regulatory adherence.

The primary consideration in component selection is the current rating differential: the substitute part is rated for 3.3 A versus the original 3.8 A. This difference must be evaluated against actual circuit current requirements. If the application operates at or below 3.3 A continuous current, the Bourns part provides an additional advantage through lower DC resistance (28 mOhm versus 37 mOhm maximum), resulting in reduced power dissipation and improved thermal performance.

Both parts maintain identical inductance values, tolerance specifications, core materials, shielding characteristics, and operating temperature ranges, ensuring functional equivalence in circuit operation.

Frequently Asked Questions (FAQ)

Q: Can the Bourns SRU1028-8R2Y be used as a direct replacement for the Würth Elektronik 7440650082?

A: Yes, provided the application current requirement does not exceed 3.3 A continuous. The substitute part matches all critical parameters including inductance, tolerance, core material, shielding, package dimensions, temperature range, and compliance certifications.

Q: What is the impact of the lower current rating on the substitute part?

A: The Bourns part is rated for 3.3 A versus 3.8 A on the original. If your circuit operates below 3.3 A, there is no functional impact. If your application requires the full 3.8 A rating, the original Würth part must be used.

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

A: The Bourns part has 28 mOhm DCR compared to 37 mOhm maximum on the Würth part. Lower resistance reduces power dissipation and heat generation, which is a performance improvement. This does not negatively affect circuit operation.

Q: Are the package dimensions identical between these parts?

A: Yes. Both components are 10.00 mm × 10.00 mm with a maximum seated height of 3.10 mm, ensuring identical PCB footprint compatibility and no layout modifications required.

Q: Do both parts meet the same compliance and environmental standards?

A: Yes. Both the Würth Elektronik 7440650082 and Bourns SRU1028-8R2Y are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity ratings, supporting identical manufacturing and environmental requirements.

Q: What is the inductance tolerance for both parts?

A: Both parts are specified at ±30% inductance tolerance, ensuring equivalent circuit performance characteristics across the tolerance band.

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