3483-4R7M Equivalent & Substitute Parts

Part Overview

The 3483-4R7M is a 4.7 µH unshielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 1.92 A with a maximum DC resistance of 49mOhm. This surface mount component is designed for applications requiring fixed inductance in the microhenry range with moderate current handling capability. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Inductance	4.7 µH
Inductance Tolerance	±20%
Current Rating	1.92 A
DC Resistance (DCR)	49mOhm Max
Core Material	Ferrite
Shielding	Unshielded
Type	Drum Core, Wirewound
Mounting Type	Surface Mount
Operating Temperature Range	-20°C ~ 80°C
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the 3483-4R7M is determined by the following critical parameters:

Inductance Value: 4.7 µH (fixed specification)
Inductance Tolerance: ±20% (acceptable variance range)
Current Rating: Minimum 1.92 A required
DC Resistance: Maximum 49mOhm preferred; higher values acceptable if thermal performance permits
Core Type: Ferrite drum core wirewound construction
Shielding Configuration: Unshielded
Mounting: Surface mount package
Temperature Range: Operating capability within or exceeding -20°C ~ 80°C

The SDR0603-4R7ML from Bourns Inc. meets these substitution criteria with compatible electrical and mechanical specifications.

Parameter Comparison

Parameter	3483-4R7M (API Delevan)	SDR0603-4R7ML (Bourns)	Compatibility
Inductance	4.7 µH	4.7 µH	Identical
Inductance Tolerance	±20%	±20%	Identical
Current Rating (Amps)	1.92 A	1.8 A	Substitute rated 0.12 A lower
DC Resistance (DCR)	49mOhm Max	70mOhm Max	Substitute 21mOhm higher
Core Material	Ferrite	Ferrite	Identical
Shielding	Unshielded	Unshielded	Identical
Type	Drum Core, Wirewound	Drum Core, Wirewound	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Operating Temperature Range	-20°C ~ 80°C	-40°C ~ 125°C	Substitute exceeds range
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Substitute offers improved compliance
Product Status	Obsolete	Active	Substitute actively manufactured

Engineering Selection Recommendations

The SDR0603-4R7ML is a suitable substitute for the obsolete 3483-4R7M based on the following factors:

Electrical Equivalence: Identical inductance value and tolerance ensure functional compatibility in circuit applications.
Current Handling: The substitute's 1.8 A rating is 0.12 A below the original specification. Applications operating at or below 1.8 A are fully compatible; designs requiring the full 1.92 A capability require thermal and current distribution analysis.
DC Resistance: The substitute exhibits 21mOhm higher resistance. This increases power dissipation proportionally to current squared; thermal impact must be evaluated for high-current applications.
Temperature Performance: The substitute's extended operating range (-40°C ~ 125°C) provides superior thermal margin compared to the original (-20°C ~ 80°C).
Compliance Status: The substitute achieves ROHS3 compliance, addressing regulatory requirements where the original part does not.
Availability: The substitute is actively manufactured with substantial inventory availability, ensuring long-term supply continuity.

Frequently Asked Questions (FAQ)

Q: Can the SDR0603-4R7ML directly replace the 3483-4R7M in all applications?

A: Direct replacement is suitable for applications operating at or below 1.8 A. Applications requiring the full 1.92 A rating require evaluation of the 21mOhm additional DC resistance and resulting thermal effects. The identical inductance value and tolerance ensure electrical functionality.

Q: What is the impact of the higher DC resistance in the substitute part?

A: The SDR0603-4R7ML exhibits 70mOhm maximum DCR compared to 49mOhm in the original. At 1.8 A, this results in approximately 0.226 W dissipation versus 0.143 W in the original. Thermal design must accommodate this increased power loss.

Q: Are the physical dimensions compatible?

A: The substitute (5.80mm x 5.80mm x 3.90mm) is smaller than the original (7.30mm x 7.30mm x 4.60mm). PCB layout modifications may be required; however, the reduced footprint generally simplifies integration.

Q: Does the substitute meet regulatory requirements?

A: The SDR0603-4R7ML is ROHS3 compliant, whereas the original 3483-4R7M is RoHS non-compliant. Applications subject to RoHS regulations benefit from the substitute's compliance status.

Q: What is the packaging difference?

A: The substitute is supplied in Tape & Reel (TR) format, standard for high-volume surface mount assembly. The original packaging specification was not provided. Confirm packaging compatibility with assembly processes.

Q: Is the substitute suitable for the full operating temperature range of the original?

A: The substitute exceeds the original temperature range, operating from -40°C to 125°C versus -20°C to 80°C. This provides additional thermal margin for applications approaching temperature extremes.

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