73F334AF-RC Equivalent & Substitute Parts

Part Overview

The 73F334AF-RC is a 330 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 250 mA with a maximum DC resistance of 3.8Ohm. This component is designed for through-hole axial mounting applications requiring fixed inductance in the 330 µH range. The part is currently obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications.

Substiute Parts

73F334AF-RC

Bourns Inc.In Stock: 106873F334AF-RC Datasheet

Current PartRFQ

2256R-31J

API Delevan Inc.In Stock: 9502256R-31J Datasheet

SimilarRFQ

B78108S1334J000

EPCOS - TDK ElectronicsIn Stock: 17731B78108S1334J000 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 73F334AF-RC is determined by the following critical parameters:

• Inductance value of 330 µH with ±5% tolerance
• Ferrite core material
• Unshielded configuration
• Through-hole axial mounting
• Current rating capability at or above 250 mA
• DC resistance within acceptable operating limits

The substitute parts listed below meet these core electrical and mechanical requirements, enabling direct functional replacement in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

2256R-31J (API Delevan Inc.) is the primary substitute for the 73F334AF-RC. This part exceeds the original current rating at 390 mA versus 250 mA, provides lower DC resistance at 2.51Ohm, and maintains active product status with ROHS3 compliance. The extended operating temperature range to 125°C provides additional thermal margin. This substitute is suitable for direct replacement in applications where the original 250 mA rating is the design constraint.

B78108S1334J000 (EPCOS - TDK Electronics) is an alternative substitute with active product status and ROHS3 compliance. However, this part has a reduced current rating of 190 mA, which falls below the original 250 mA specification. Additionally, the DC resistance is elevated at 6.4Ohm compared to the original 3.8Ohm. This substitute is applicable only in applications where the circuit current demand does not exceed 190 mA and where the higher DC resistance is acceptable for the intended function.

Frequently Asked Questions (FAQ)

Q: Can the 2256R-31J replace the 73F334AF-RC in all applications?

A: The 2256R-31J meets or exceeds all critical electrical parameters of the 73F334AF-RC, including inductance, tolerance, current rating, and DC resistance. It is suitable for direct replacement in applications designed for the original part.

Q: What is the limitation of the B78108S1334J000 substitute?

A: The B78108S1334J000 has a current rating of 190 mA, which is below the original 250 mA specification. This part is only suitable for applications where the actual circuit current does not exceed 190 mA. Additionally, its higher DC resistance of 6.4Ohm may affect circuit performance in applications sensitive to resistive losses.

Q: Are all substitute parts RoHS compliant?

A: Yes, all listed substitute parts are ROHS3 compliant, matching the compliance status of the original 73F334AF-RC.

Q: Do the substitute parts have the same physical dimensions?

A: No. The 2256R-31J has dimensions of 0.225" Dia x 0.570" L, and the B78108S1334J000 has dimensions of 0.157" Dia x 0.362" L, both differing from the original 0.370" Dia x 0.625" L. Physical fit must be verified for the specific application.

Q: What is the inductance test frequency for each part?

A: The 73F334AF-RC is tested at 790 kHz, the 2256R-31J at 1 kHz, and the B78108S1334J000 at 796 kHz. These differences may result in minor inductance variations under different operating frequencies.