4554R-3R3M Fixed Inductor Equivalent & Substitute Parts

Part Overview

The 4554R-3R3M is a 3.3 µH unshielded fixed inductor manufactured by API Delevan Inc., designed for through-hole mounting applications requiring moderate current handling. This Active product is rated for 5.5 A continuous current with a maximum DC resistance of 25 mOhm and operates across the temperature range of -40°C to 85°C. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, design flexibility, or supply chain considerations.

Key Parameters

Parameter	Value	Unit
Inductance	3.3	µH
Inductance Tolerance	±20%	%
Current Rating	5.5	A
DC Resistance (Max)	25	mOhm
Q Factor @ 7.96 MHz	20	-
Self Resonant Frequency	79	MHz
Operating Temperature Range	-40 to 85	°C
Shielding	Unshielded	-
Core Material	Ferrite	-
Mounting Type	Through Hole	-
Package Type	Radial, Vertical Cylinder	-

Substitute Part Grouping Explanation

Substitution of the 4554R-3R3M is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Inductance value: 3.3 µH with ±20% tolerance
Current rating: 5.5 A minimum
DC resistance: 25 mOhm maximum
Core material: Ferrite
Shielding configuration: Unshielded

Mechanical Equivalence Criteria:

Mounting type: Through Hole
Package configuration: Radial, Vertical Cylinder
Physical form factor compatibility with PCB footprints designed for the 4554R series

Compliance Equivalence Criteria:

RoHS3 compliance status
REACH unaffected classification
Product status: Active

The RLB9012-3R3ML from Bourns Inc. meets all electrical and mechanical substitution criteria, with identical inductance, current rating, and DC resistance specifications. Dimensional variations and extended operating temperature range are noted in the parameter comparison table.

Parameter Comparison

Parameter	4554R-3R3M (API Delevan)	RLB9012-3R3ML (Bourns)	Match Status
Inductance	3.3 µH	3.3 µH	Equivalent
Inductance Tolerance	±20%	±20%	Equivalent
Current Rating	5.5 A	5.5 A	Equivalent
DC Resistance (Max)	25 mOhm	25 mOhm	Equivalent
Q @ 7.96 MHz	20	20	Equivalent
Core Material	Ferrite	Ferrite	Equivalent
Shielding	Unshielded	Unshielded	Equivalent
Operating Temperature Range	-40°C to 85°C	-55°C to 125°C	Extended Range
Self Resonant Frequency	79 MHz	65 MHz	Variation
Mounting Type	Through Hole	Through Hole	Equivalent
Package Type	Radial, Vertical Cylinder	Radial, Vertical Cylinder	Equivalent
Size / Dimension	0.340" Dia (8.64 mm)	0.354" Dia (9.00 mm)	Minor Variation
Height - Seated (Max)	0.433" (11.00 mm)	0.480" (12.20 mm)	Minor Variation
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent
Product Status	Active	Active	Equivalent

Engineering Selection Recommendations

Primary Selection: 4554R-3R3M

The 4554R-3R3M remains the primary component choice when available. It is an Active product with full RoHS3 compliance and REACH unaffected status, meeting all regulatory requirements for current applications.

Substitute Selection: RLB9012-3R3ML

The RLB9012-3R3ML from Bourns Inc. is a qualified substitute when the 4554R-3R3M is unavailable. Both components are Active products with identical RoHS3 and REACH compliance certifications. The RLB9012-3R3ML provides extended operating temperature range (-55°C to 125°C versus -40°C to 85°C), which may offer additional design margin in temperature-sensitive applications.

Dimensional Considerations:

The RLB9012-3R3ML exhibits minor dimensional variations: diameter increases from 8.64 mm to 9.00 mm, and seated height increases from 11.00 mm to 12.20 mm. PCB layout verification is required to confirm footprint compatibility, particularly in space-constrained designs.

Frequency Response Consideration:

The self-resonant frequency differs between parts (79 MHz for 4554R-3R3M versus 65 MHz for RLB9012-3R3ML). Applications operating near or above 65 MHz require circuit validation to confirm acceptable performance with the substitute part.

Frequently Asked Questions (FAQ)

Q: Can the RLB9012-3R3ML be used as a direct replacement for the 4554R-3R3M?

A: Yes, the RLB9012-3R3ML meets all critical electrical specifications: 3.3 µH inductance, 5.5 A current rating, and 25 mOhm maximum DC resistance. Both components are through-hole mounted in radial vertical cylinder packages. PCB layout verification is required due to minor dimensional differences (diameter and height).

Q: What are the key differences between these two inductors?

A: The primary differences are: (1) Operating temperature range—RLB9012-3R3ML extends to -55°C to 125°C versus -40°C to 85°C for the 4554R-3R3M; (2) Self-resonant frequency—79 MHz versus 65 MHz; (3) Physical dimensions—RLB9012-3R3ML is slightly larger in diameter (9.00 mm vs 8.64 mm) and height (12.20 mm vs 11.00 mm); (4) Inductance test frequency—7.96 MHz for 4554R-3R3M versus 1 kHz for RLB9012-3R3ML.

Q: Are both parts RoHS3 compliant?

A: Yes, both the 4554R-3R3M and RLB9012-3R3ML are RoHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component manufacturing and use.

Q: Will the dimensional differences affect my PCB design?

A: The RLB9012-3R3ML is slightly larger (0.354" diameter and 0.480" height versus 0.340" diameter and 0.433" height). Verify that your PCB footprint and surrounding component placement accommodate these minor increases before substitution.

Q: Which part should I specify for new designs?

A: Specify the 4554R-3R3M as the primary component. If extended temperature range is required, the RLB9012-3R3ML provides -55°C to 125°C operation. Confirm self-resonant frequency requirements for your application, as the RLB9012-3R3ML operates at 65 MHz versus 79 MHz for the 4554R-3R3M.

Q: Are there packaging differences between these parts?

A: Yes, the 4554R-3R3M is supplied in Bulk packaging, while the RLB9012-3R3ML is supplied in Tray packaging. This affects procurement and handling but does not impact electrical or mechanical performance.

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