73F683AF-RC Equivalent & Substitute Parts

Part Overview

The 73F683AF-RC is a 6.8 mH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 80 mA maximum current with 29 Ohm DC resistance. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. The part operates across a temperature range of -55°C to 105°C and is ROHS3 compliant.

Key Parameters

Parameter	Value
Inductance	6.8 mH
Inductance Tolerance	±5%
Current Rating	80 mA
DC Resistance (DCR)	29 Ohm Max
Core Type	Drum Core, Wirewound
Core Material	Ferrite
Shielding	Unshielded
Mounting Type	Through Hole
Package	Axial
Operating Temperature	-55°C ~ 105°C
Q @ 250 kHz	95
Self Resonant Frequency	900 kHz

Substitute Part Grouping Explanation

Substitute parts for the 73F683AF-RC are identified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Inductance value: 6.8 mH ±5%
Current rating: minimum 80 mA
Mounting type: Through Hole
Package: Axial
Shielding: Unshielded

Secondary Compatibility Factors:

Operating temperature range overlap with -55°C minimum
DC resistance within acceptable circuit design tolerances
ROHS3 compliance for regulatory alignment

Two substitute parts meet these criteria with acceptable parameter variations for circuit-level substitution.

Parameter Comparison

Parameter	73F683AF-RC (Bourns)	B82144A2685J000 (EPCOS - TDK)	4470R-47J (API Delevan)
Inductance	6.8 mH	6.8 mH	6.8 mH
Inductance Tolerance	±5%	±5%	±5%
Current Rating (Amps)	80 mA	80 mA	85 mA
DC Resistance (DCR)	29 Ohm Max	30 Ohm Max	67 Ohm Max
Core Type	Drum Core, Wirewound	Drum Core, Wirewound	Molded
Core Material	Ferrite	Ferrite	Iron
Shielding	Unshielded	Unshielded	Unshielded
Mounting Type	Through Hole	Through Hole	Through Hole
Package	Axial	Axial	Axial
Operating Temperature	-55°C ~ 105°C	-55°C ~ 125°C	-55°C ~ 125°C
Q @ Frequency	95 @ 250 kHz	60 @ 252 kHz	65 @ 250 kHz
Self Resonant Frequency	900 kHz	400 kHz	600 kHz
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

B82144A2685J000 (EPCOS - TDK Electronics - LBC Series)

This substitute provides the closest electrical match to the 73F683AF-RC. Both components feature ferrite drum core wirewound construction with identical inductance and current ratings. The DCR specification of 30 Ohm Max represents a 3.4% increase from the original 29 Ohm specification, which is within typical circuit design tolerances. The extended operating temperature range to 125°C provides additional thermal margin. Active product status ensures long-term availability and supply chain continuity. ROHS3 compliance is maintained.

4470R-47J (API Delevan Inc. - 4470R Series)

This substitute meets the primary inductance and current rating requirements with a 5 mA higher current rating (85 mA). The molded iron core construction differs from the original ferrite drum core design, resulting in a higher DCR specification of 67 Ohm Max. This represents a 131% increase in DC resistance and may impact circuit performance in applications sensitive to resistive losses. The lower Q factor (65 @ 250 kHz versus 95 @ 250 kHz) and reduced self-resonant frequency (600 kHz versus 900 kHz) indicate different frequency response characteristics. This substitute is suitable for applications where DCR and frequency response variations are acceptable. Active product status and ROHS3 compliance are confirmed.

Frequently Asked Questions (FAQ)

Q: Can B82144A2685J000 be used as a direct replacement for 73F683AF-RC?

A: Yes. Both components share identical inductance (6.8 mH), current rating (80 mA), core type (ferrite drum core wirewound), and mounting configuration (through hole axial). The 1 Ohm increase in maximum DCR falls within standard circuit design tolerances. The substitute is active and readily available.

Q: What are the limitations of using 4470R-47J as a substitute?

A: The 4470R-47J uses molded iron core construction instead of ferrite drum core, resulting in significantly higher DC resistance (67 Ohm Max versus 29 Ohm Max). This 131% increase in DCR will increase power dissipation and may alter circuit performance in applications sensitive to resistive losses. The lower Q factor and reduced self-resonant frequency indicate different frequency response. This substitute is acceptable only in applications where these parameter variations do not impact circuit function.

Q: Are all substitute parts available in the same packaging format?

A: All three components use through hole axial packaging. However, physical dimensions differ. The B82144A2685J000 is significantly smaller (5.20mm Dia x 12.00mm L) compared to the original 73F683AF-RC (14.99mm Dia x 15.88mm L). The 4470R-47J has intermediate dimensions (7.87mm Dia x 23.11mm L). PCB layout verification is required before substitution.

Q: Do all substitute parts meet the same compliance standards?

A: Yes. Both B82144A2685J000 and 4470R-47J are ROHS3 compliant and REACH unaffected, matching the original part's regulatory status. Both are classified under HTSUS 8504.50.8000.

Q: Which substitute should be selected for new designs?

A: B82144A2685J000 is recommended for new designs due to closest electrical equivalence, active product status, and minimal parameter deviation. The 4470R-47J should be considered only when specific design requirements favor its electrical characteristics or when supply constraints necessitate alternative sourcing.

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