FN686-25-23 Equivalent & Substitute Parts

Part Overview

The FN686-25-23 is a single-phase EMC/EMI line filter manufactured by Schaffner EMC Inc., rated for 250VAC at 25A with a two-stage configuration and terminal block termination. This chassis-mount filter is designed for general-purpose applications across DC to 400Hz frequency range. The product is currently obsolete, making identification of compatible substitute components essential for system maintenance, repair, and redesign applications where continued availability is required.

Substiute Parts

FN686-25-23

Schaffner EMC Inc.In Stock: 1162FN686-25-23 Datasheet

Current PartRFQ

FN2070-25-08

Schaffner EMC Inc.In Stock: 960FN2070-25-08 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FN686-25-23 is determined by the following critical parameters:

• Current Rating: 25A (exact match required)
• Filter Type & Configuration: Single Phase, Two Stage (functional equivalence)
• Voltage Compatibility: 250VAC operation (minimum requirement)
• Frequency Range: DC ~ 400Hz (operating envelope)
• Mounting & Termination: Chassis mount configuration (mechanical fit consideration)
• Regulatory Compliance: CSA, ENEC, UR certifications (safety and market approval)

The FN2070-25-08 qualifies as a substitute because it maintains the same current rating (25A), filter type (single phase), configuration (two stage), frequency range (DC ~ 400Hz), mounting type (chassis mount), and regulatory approvals. The FN2070-25-08 extends voltage compatibility to include 110V in addition to 250V, providing broader application flexibility. Termination style differs (threaded post M4 versus terminal block), requiring mechanical interface evaluation during integration.

Parameter Comparison

Engineering Selection Recommendations

The FN2070-25-08 is the qualified substitute for the obsolete FN686-25-23 based on the following engineering criteria:

Functional Equivalence: Both components maintain identical current rating (25A), filter type (single phase), configuration (two stage), frequency operating range (DC ~ 400Hz), and regulatory certifications (CSA, ENEC, UR).

Product Availability: The FN2070-25-08 holds active product status with 882 units in stock, ensuring supply continuity for applications currently using the FN686-25-23.

Compliance Enhancement: The FN2070-25-08 meets ROHS3 compliance, representing a more current regulatory standard than the RoHS Compliant designation of the original part.

Mechanical Integration Consideration: The termination style differs between the two components. The FN686-25-23 uses terminal block termination, while the FN2070-25-08 uses threaded post (M4) termination. System integration requires evaluation of the mechanical mounting interface and electrical connection methodology.

Voltage Flexibility: The FN2070-25-08 supports both 110V and 250V operation, providing broader application compatibility compared to the 250V-only rating of the FN686-25-23.

Frequently Asked Questions (FAQ)

Q: Can the FN2070-25-08 directly replace the FN686-25-23 without modification?

A: The FN2070-25-08 is functionally equivalent in terms of current rating, filter configuration, frequency range, and regulatory compliance. However, the termination style differs: the FN686-25-23 uses terminal block connections while the FN2070-25-08 uses threaded post (M4) connections. Mechanical interface adaptation may be required depending on the existing system design.

Q: What is the significance of the inductance difference between the two parts?

A: The FN686-25-23 has an inductance of 1.35mH, while the FN2070-25-08 has 2mH. Both values are within the operating parameters for single-phase EMC/EMI line filters at 25A. The higher inductance of the FN2070-25-08 may provide enhanced filtering characteristics in certain frequency bands but does not prevent substitution for general-purpose applications.

Q: Are both parts suitable for the same voltage applications?

A: The FN686-25-23 is rated for 250VAC operation. The FN2070-25-08 supports both 110V and 250VAC operation. For applications requiring 250VAC, both parts are compatible. For applications requiring 110V operation, only the FN2070-25-08 is suitable.

Q: What certifications do both parts carry?

A: Both the FN686-25-23 and FN2070-25-08 carry CSA, ENEC, and UR approvals, ensuring compliance with North American and European safety standards for EMC/EMI filtering applications.

Q: Why is the FN686-25-23 listed as obsolete?

A: The FN686-25-23 has reached end-of-life status in the manufacturer's product portfolio. The FN2070-25-08 represents the current-generation equivalent, offering the same functional performance with enhanced compliance standards and continued manufacturing support.