73F684AF-RC Equivalent & Substitute Parts

Part Overview

The 73F684AF-RC is a 680 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 200 mA with a maximum DC resistance of 6 Ohm. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates across a temperature range of -55°C to 105°C and meets ROHS3 compliance standards.

Substiute Parts

73F684AF-RC

Bourns Inc.In Stock: 74173F684AF-RC Datasheet

Current PartRFQ

AIAP-01-681K-T

Abracon LLCIn Stock: 836AIAP-01-681K-T Datasheet

SimilarRFQ

B82145A1684J000

EPCOS - TDK ElectronicsIn Stock: 8928B82145A1684J000 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 73F684AF-RC are selected based on the following critical parameters:

• Inductance value: 680 µH (exact match required)
• Mounting type: Through hole, axial configuration
• Shielding: Unshielded
• Current rating: Minimum 200 mA
• DC resistance: Maximum 6 Ohm
• Operating temperature range: Must support -55°C minimum
• Tolerance: ±5% or tighter preferred

Two substitute parts meet these criteria with varying performance characteristics and availability status.

Parameter Comparison

Engineering Selection Recommendations

B82145A1684J000 (EPCOS - TDK Electronics) is the primary substitute for the 73F684AF-RC. This part maintains identical inductance and tolerance specifications, offers superior current handling at 440 mA, and provides lower DC resistance at 2.5 Ohm maximum. The extended operating temperature range to 125°C and active product status ensure long-term availability and supply chain stability. Both parts feature ferrite drum core construction and meet ROHS3 compliance.

AIAP-01-681K-T (Abracon LLC) serves as an alternative substitute when space constraints are critical. This part delivers the required 680 µH inductance in a significantly smaller package (3.30mm × 9.14mm versus 6.50mm × 12.00mm). However, the current rating of 180 mA falls below the original specification, and DC resistance increases to 6.4 Ohm with relaxed tolerance at ±10%. This option is suitable only for applications where current demand does not exceed 180 mA and where tolerance variation is acceptable.

Frequently Asked Questions (FAQ)

Q: Can AIAP-01-681K-T replace 73F684AF-RC in all applications?

A: No. The AIAP-01-681K-T has a maximum current rating of 180 mA, which is below the original 200 mA specification. Use this substitute only if your circuit operates at or below 180 mA. Additionally, the ±10% tolerance is wider than the original ±5%, which may affect circuit performance in precision applications.

Q: What are the physical size differences between substitutes?

A: The 73F684AF-RC measures 0.400" diameter × 0.625" length (10.16mm × 15.88mm). The B82145A1684J000 is smaller at 0.256" diameter × 0.472" length (6.50mm × 12.00mm). The AIAP-01-681K-T is the smallest at 0.130" diameter × 0.360" length (3.30mm × 9.14mm). Verify PCB layout compatibility before selection.

Q: Does the lower DC resistance of B82145A1684J000 affect circuit operation?

A: The B82145A1684J000 has 2.5 Ohm maximum DC resistance compared to 6 Ohm in the original part. Lower resistance reduces power dissipation and heat generation, which is generally beneficial. However, verify that your circuit design does not depend on the original resistance value for current limiting or impedance matching.

Q: Are both substitutes RoHS compliant?

A: Yes. Both AIAP-01-681K-T and B82145A1684J000 are ROHS3 compliant, matching the original part's compliance status.

Q: What is the minimum operating temperature for each substitute?

A: The 73F684AF-RC and B82145A1684J000 both operate down to -55°C. The AIAP-01-681K-T has a minimum operating temperature of -40°C. If your application requires operation below -40°C, use B82145A1684J000 or the original part.