FN685-16-03 Equivalent & Substitute Parts

Part Overview

The FN685-16-03 is a single-phase EMC/EMI line filter manufactured by Schaffner EMC Inc., rated for 250VAC at 16A with a two-stage configuration and terminal block termination. This chassis-mounted filter operates across DC to 400Hz frequency range and is designed for general-purpose applications requiring electromagnetic compatibility filtering.

The FN685-16-03 is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain system compatibility and ensure continued availability for applications currently utilizing this component.

Substiute Parts

FN685-16-03

Schaffner EMC Inc.In Stock: 1058FN685-16-03 Datasheet

Current PartRFQ

FN2080-16-06

Schaffner EMC Inc.In Stock: 3411FN2080-16-06 Datasheet

SimilarRFQ

FN2090-16-06

Schaffner EMC Inc.In Stock: 985FN2090-16-06 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FN685-16-03 are identified based on the following critical parameters that determine functional equivalence:

• Single-phase filter configuration
• Two-stage topology
• 16A current rating
• 250VAC voltage compatibility
• DC to 400Hz operating frequency range
• Chassis mount form factor
• General-purpose application suitability
• Equivalent regulatory approvals (CSA, ENEC, UR)

The substitute parts FN2080-16-06 and FN2090-16-06 maintain these core electrical and mechanical characteristics. Both substitutes support dual voltage operation (110V/250VAC), providing enhanced flexibility compared to the original part's single 250V rating. Both are active products with current manufacturing status and improved RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

Both FN2080-16-06 and FN2090-16-06 are active products with current manufacturing support, addressing the obsolescence of the FN685-16-03. Selection between these substitutes depends on specific application requirements:

FN2080-16-06 maintains the closest inductance value (2.8mH) to the original part (2.3mH) and retains the same regulatory approval set (CSA, ENEC, UR). This part is suitable for applications where inductance characteristics are critical to system performance.

FN2090-16-06 provides the broadest regulatory coverage with CE certification in addition to CSA, ENEC, and UR approvals. The higher inductance value (4mH) and extended temperature range minimum (-20°C versus -25°C) should be evaluated against specific application thermal and filtering requirements.

Both substitutes employ Quick Connect termination rather than terminal block, requiring connector interface adaptation during integration. Both support dual voltage operation (110V/250VAC), providing operational flexibility not present in the original single-voltage design.

Frequently Asked Questions (FAQ)

Q: Can FN2080-16-06 or FN2090-16-06 directly replace FN685-16-03 without modification?

A: Both substitutes maintain electrical equivalence for 250VAC 16A single-phase two-stage filtering. However, termination style differs: the original uses terminal block while substitutes use Quick Connect. Connector interface adaptation is required during installation.

Q: What is the significance of inductance differences between the three parts?

A: Inductance values (2.3mH, 2.8mH, and 4mH) affect filter frequency response characteristics. FN2080-16-06 provides the closest inductance match to the original. Applications with specific attenuation requirements should evaluate whether the inductance variation impacts performance.

Q: Are the substitute parts suitable for 110VAC applications?

A: Yes. Both FN2080-16-06 and FN2090-16-06 are rated for dual voltage operation (110V/250VAC), whereas the original FN685-16-03 is rated for 250VAC only. This provides expanded application flexibility.

Q: What are the regulatory compliance differences?

A: FN685-16-03 holds CSA, ENEC, and UR approvals. FN2080-16-06 maintains identical approvals. FN2090-16-06 adds CE certification, providing broader European market compliance.

Q: How do operating temperature ranges compare?

A: FN685-16-03 and FN2080-16-06 both operate from -25°C to 100°C. FN2090-16-06 operates from -20°C to 100°C, with a 5°C higher minimum temperature limit. Applications requiring operation below -20°C should specify FN2080-16-06 or the original part.

Q: What packaging considerations apply to these substitutes?

A: FN685-16-03 uses standard packaging. Both substitutes (FN2080-16-06 and FN2090-16-06) are supplied in trays. Procurement and handling procedures may require adjustment to accommodate tray packaging.