3483-6R8M Equivalent & Substitute Parts

Part Overview

The 3483-6R8M is a 6.8 µH unshielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 1.6 A continuous current with a maximum DC resistance of 67 mOhm. This surface mount component operates across the temperature range of -20°C to 80°C and is specified with ±20% inductance tolerance at 100 kHz test frequency.

The 3483-6R8M has reached obsolete product status. Locating equivalent substitute parts is necessary to support ongoing production requirements, maintenance operations, and design continuity for applications currently utilizing this inductor.

Key Parameters

Parameter	Value
Inductance	6.8 µH
Inductance Tolerance	±20%
Current Rating	1.6 A
DC Resistance (DCR)	67 mOhm Max
Core Type	Ferrite Drum Core, Unshielded
Mounting Type	Surface Mount
Operating Temperature Range	-20°C to 80°C
Package Type	Nonstandard
RoHS Status	RoHS Non-Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 3483-6R8M is determined by the following critical parameters:

Primary Matching Criteria:

Inductance value: 6.8 µH
Inductance tolerance: ±20%
Core material: Ferrite
Core configuration: Drum core, unshielded
Mounting type: Surface mount

Secondary Compatibility Factors:

Current rating must equal or exceed 1.6 A
DC resistance must not exceed 67 mOhm
Operating temperature range must encompass or exceed -20°C to 80°C
Package classification: Nonstandard surface mount

The SDR0603-6R8ML from Bourns Inc. satisfies all primary matching criteria and maintains electrical compatibility within the specified parameter envelope.

Parameter Comparison

Parameter	3483-6R8M (API Delevan)	SDR0603-6R8ML (Bourns)	Compatibility Status
Inductance	6.8 µH	6.8 µH	Identical
Inductance Tolerance	±20%	±20%	Identical
Current Rating (Amps)	1.6 A	1.38 A	Substitute rated lower; verify application requirements
DC Resistance (DCR)	67 mOhm Max	110 mOhm Max	Substitute has higher DCR; verify thermal and efficiency impact
Core Type	Ferrite Drum Core, Unshielded	Ferrite Drum Core, Unshielded	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Operating Temperature Range	-20°C to 80°C	-40°C to 125°C	Substitute exceeds specification
Size / Dimension	0.287" L x 0.287" W (7.30mm x 7.30mm)	0.228" L x 0.228" W (5.80mm x 5.80mm)	Substitute is smaller; verify PCB layout compatibility
Height - Seated (Max)	0.138" (3.50mm)	0.154" (3.90mm)	Substitute is taller; verify clearance
RoHS Status	RoHS Non-Compliant	RoHS3 Compliant	Substitute offers improved compliance
Product Status	Obsolete	Active	Substitute is in active production

Engineering Selection Recommendations

Substitution Feasibility:

The SDR0603-6R8ML is electrically compatible with the 3483-6R8M for applications where the following conditions are satisfied:

Current Requirement: The application current demand does not exceed 1.38 A. If the original design operates at or near 1.6 A, the substitute's lower current rating of 1.38 A may present a thermal or reliability concern.
DC Resistance Impact: The substitute exhibits 110 mOhm maximum DCR compared to the original 67 mOhm maximum. This 43 mOhm increase will result in higher resistive losses and heat dissipation. Thermal analysis of the application is required to confirm acceptable performance.
Physical Dimensions: The substitute is physically smaller (5.80mm x 5.80mm versus 7.30mm x 7.30mm) but taller (3.90mm versus 3.50mm). PCB layout and component clearance must be verified before substitution.
Compliance Status: The SDR0603-6R8ML is RoHS3 compliant and in active production status, providing supply chain continuity and regulatory alignment advantages over the obsolete 3483-6R8M.
Temperature Range: The substitute's extended operating range (-40°C to 125°C) exceeds the original specification, providing additional operational margin.

Frequently Asked Questions (FAQ)

Q: Can the SDR0603-6R8ML directly replace the 3483-6R8M without circuit modification?

A: Direct replacement is possible only if the application current remains below 1.38 A and the increased DC resistance (110 mOhm versus 67 mOhm) does not compromise circuit performance or thermal management. PCB layout must accommodate the smaller footprint and increased height.

Q: What is the impact of the higher DC resistance in the SDR0603-6R8ML?

A: The 43 mOhm increase in maximum DCR will increase resistive power loss proportionally to the square of the current. At 1.38 A, the substitute dissipates approximately 0.209 W compared to 0.127 W for the original part. Thermal design review is required.

Q: Are there dimensional compatibility issues?

A: The substitute is smaller in footprint (5.80mm x 5.80mm versus 7.30mm x 7.30mm) but taller (3.90mm versus 3.50mm). Verify that the PCB layout accommodates the smaller footprint and that component clearance above the inductor is sufficient for the additional 0.40mm height.

Q: Does the substitute meet regulatory requirements?

A: The SDR0603-6R8ML is RoHS3 compliant, whereas the 3483-6R8M is RoHS non-compliant. If RoHS compliance is a requirement, the substitute satisfies this criterion.

Q: What is the inductance tolerance match?

A: Both parts specify ±20% inductance tolerance, ensuring equivalent circuit behavior within the tolerance band.

Q: Is the substitute in active production?

A: Yes. The SDR0603-6R8ML is classified as active product status with confirmed inventory availability, ensuring long-term supply chain support compared to the obsolete 3483-6R8M.

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