FB73-085-RC Ferrite Core Equivalent & Substitute Parts

Part Overview

The FB73-085-RC is a solid free hanging ferrite core manufactured by Bourns Inc., designed for electromagnetic interference suppression and signal conditioning applications. With an inner diameter of 0.031" (0.78mm) and outer diameter of 0.056" (1.42mm), this component operates in the FB series material composition (73). The part is currently classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing production and maintenance applications. Substitute parts must maintain compatible mechanical dimensions and mounting characteristics while meeting equivalent electrical performance requirements.

Substiute Parts

FB73-085-RC

Bourns Inc.In Stock: 1146FB73-085-RC Datasheet

Current PartRFQ

74270001

Würth ElektronikIn Stock: 392974270001 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FB73-085-RC is determined by the following critical parameters:

• Mechanical Compatibility: Inner diameter tolerance (0.78mm nominal), outer diameter tolerance (1.42mm nominal), and axial length (2.41mm nominal) must accommodate the component within existing circuit board layouts and cable pass-through applications
• Design Type: Solid ferrite core construction without segmentation or split design
• Mounting Configuration: Free hanging installation without requiring additional mechanical fixtures
• Regulatory Compliance: ROHS3 compliance and REACH unaffected status required for equivalent substitution
• Material Classification: Ferrite material composition suitable for the intended frequency range and impedance characteristics of the original application

The substitute part 74270001 (Würth Elektronik WE-SAFB series) qualifies as a functional equivalent based on matching design type (solid), mounting method (free hanging), and regulatory compliance profile. Dimensional variations exist within acceptable tolerance ranges for typical ferrite core applications.

Parameter Comparison

Engineering Selection Recommendations

The 74270001 (Würth Elektronik) represents an active production alternative to the obsolete FB73-085-RC. Both components maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for equivalent substitution in applications subject to these standards.

The substitute part exhibits dimensional variations: the inner diameter is nominally 0.02" smaller (0.76mm vs 0.78mm), while the outer diameter is 0.042" larger (2.50mm vs 1.42mm) and the axial length is 0.062" greater (4.00mm vs 2.41mm). These dimensional differences require verification against specific application constraints, particularly in space-constrained installations or where precise dimensional matching is critical to circuit performance.

The 74270001 is supplied in bag packaging format and maintains active production status, ensuring long-term availability and supply chain continuity compared to the obsolete FB73-085-RC.

Frequently Asked Questions (FAQ)

Q: Can the 74270001 be used as a direct replacement for FB73-085-RC in all applications?

A: Both components share solid ferrite core design and free hanging mounting characteristics. However, dimensional differences (outer diameter and length) must be evaluated against specific application requirements. Verify that the larger physical envelope of the 74270001 does not conflict with circuit board layout or cable routing constraints.

Q: What are the key differences between these ferrite cores?

A: The primary differences are dimensional: the 74270001 has a smaller inner diameter (0.76mm vs 0.78mm), larger outer diameter (2.50mm vs 1.42mm), and greater length (4.00mm vs 2.41mm). Both maintain identical mounting type (free hanging) and regulatory compliance status (ROHS3, REACH unaffected).

Q: Why is the FB73-085-RC listed as obsolete?

A: The FB73-085-RC is classified as obsolete by Bourns Inc., indicating discontinued production. The 74270001 from Würth Elektronik is maintained in active production status, providing supply continuity for applications requiring ferrite core components with equivalent functional characteristics.

Q: Are there packaging differences between these parts?

A: The FB73-085-RC packaging is not specified in available documentation. The 74270001 is supplied in bag packaging format, which is standard for ferrite core components in this size category.

Q: What material compositions are used in each core?

A: The FB73-085-RC uses material composition 73 (Bourns designation). The 74270001 uses material composition 4W1500 (Würth Elektronik designation). The 74270001 is specified at 52 Ohm impedance at 100 MHz, indicating material selection optimized for this frequency range.