73F474AF-RC Equivalent & Substitute Parts

Part Overview

The 73F474AF-RC is a 470 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 200 mA maximum current with 4.8Ohm DC resistance. This through-hole axial component operates across -55°C to 105°C and is classified as obsolete. Due to its obsolete status, equivalent substitute parts from active manufacturers are necessary to maintain design continuity and ensure long-term component availability for new production runs and field replacements.

Key Parameters

Parameter	Value
Inductance	470 µH
Tolerance	±5%
Current Rating	200 mA
DC Resistance (DCR)	4.8Ohm Max
Core Type	Ferrite Drum Core, Unshielded
Mounting Type	Through Hole Axial
Operating Temperature	-55°C ~ 105°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 73F474AF-RC is determined by the following mandatory parameters:

Inductance Value: 470 µH (exact match required)
Tolerance: ±5% (matching tolerance specification)
Core Type: Ferrite drum core, unshielded (same magnetic core construction)
Mounting Type: Through hole axial (same physical mounting interface)
Current Rating: Minimum 200 mA (substitute must support or exceed the original rating)
DC Resistance: Acceptable range determined by circuit design margins
Operating Temperature Range: Minimum -55°C ~ 105°C coverage
RoHS Compliance: ROHS3 compliant (regulatory requirement)

The two substitute parts listed below meet these core substitution criteria while offering improved availability through active product status.

Parameter Comparison

Parameter	73F474AF-RC (Bourns)	4590R-474J (API Delevan)	B78108S1474J000 (EPCOS - TDK)
Inductance	470 µH	470 µH	470 µH
Tolerance	±5%	±5%	±5%
Current Rating (Amps)	200 mA	1.3 A	170 mA
DC Resistance (DCR)	4.8Ohm Max	393mOhm Max	7.9Ohm Max
Core Type	Ferrite Drum Core, Unshielded	Ferrite Drum Core, Unshielded	Ferrite Drum Core, Unshielded
Mounting Type	Through Hole Axial	Through Hole Axial	Through Hole Axial
Operating Temperature	-55°C ~ 105°C	-55°C ~ 125°C	Not specified
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

4590R-474J (API Delevan Inc.) is suitable for applications where the original 200 mA current rating is insufficient or where lower DC resistance is beneficial. This part offers significantly lower DCR (393mOhm vs 4.8Ohm), extended temperature range to 125°C, and higher current capacity at 1.3 A. The active product status ensures long-term availability. Physical dimensions are larger (0.455" Dia x 0.900" L) compared to the original part.

B78108S1474J000 (EPCOS - TDK Electronics) provides a closer current rating match at 170 mA, within acceptable operating margins of the original 200 mA specification. This part features higher DC resistance (7.9Ohm) and significantly smaller physical dimensions (0.157" Dia x 0.362" L). Active product status and ROHS3 compliance are confirmed. Operating temperature range is not specified in available data.

Both substitutes maintain ROHS3 compliance and ferrite drum core construction. Selection between them depends on circuit-specific requirements for current headroom, DC resistance tolerance, physical space constraints, and temperature operating range.

Frequently Asked Questions (FAQ)

Q: Can the 4590R-474J replace the 73F474AF-RC in all applications?

A: The 4590R-474J meets all core substitution criteria: 470 µH inductance, ±5% tolerance, ferrite drum core, through-hole axial mounting, and ROHS3 compliance. However, its larger physical dimensions (0.455" Dia x 0.900" L vs 0.390" Dia x 0.625" L) require verification of available PCB space. The significantly lower DCR (393mOhm vs 4.8Ohm) and higher current rating (1.3 A vs 200 mA) are advantageous for most applications.

Q: What are the key differences between the two substitute parts?

A: The 4590R-474J offers lower DC resistance and higher current capacity, making it suitable for high-current applications. The B78108S1474J000 provides a closer current rating match to the original part and occupies significantly less PCB space due to its smaller form factor. DCR is higher in the B78108S1474J000 (7.9Ohm vs 393mOhm).

Q: Are both substitute parts RoHS compliant?

A: Yes, both 4590R-474J and B78108S1474J000 are ROHS3 compliant. The original 73F474AF-RC is also ROHS3 compliant.

Q: What is the impact of different DC resistance values on circuit performance?

A: DC resistance affects power dissipation and voltage drop across the inductor. The 4590R-474J (393mOhm) dissipates significantly less power than the original (4.8Ohm) at the same current. The B78108S1474J000 (7.9Ohm) dissipates slightly more power than the original. Circuit design margins and thermal considerations determine acceptable DCR ranges.

Q: Can the B78108S1474J000 be used if the application requires 200 mA continuous current?

A: The B78108S1474J000 is rated for 170 mA, which is below the original 200 mA specification. Use of this part at or above 200 mA exceeds its rated current capacity and is not recommended without circuit redesign or thermal analysis.

Q: What packaging formats are available for these substitutes?

A: The 4590R-474J is supplied in bulk packaging. The B78108S1474J000 is supplied in cut tape (CT) format. Packaging selection depends on production volume and assembly requirements.

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