FCN2420G333J Equivalent & Substitute Parts

Part Overview

The FCN2420G333J is a 0.033 µF film capacitor rated for 400V DC operation, manufactured by Cornell Dubilier Electronics (CDE). This component features a metallized polyester/polyethylene naphthalate (PEN) dielectric in a 2420 (6050 Metric) surface mount package. The part is classified as obsolete, necessitating identification of active equivalent components for ongoing production and maintenance applications.

Substiute Parts

FCN2420G333J

Cornell Dubilier Electronics (CDE)In Stock: 1182FCN2420G333J Datasheet

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ECW-U4333V17

Panasonic Electronic ComponentsIn Stock: 10622ECW-U4333V17 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FCN2420G333J is based on the following critical parameters that must remain constant:

Mandatory Matching Parameters:

• Capacitance: 0.033 µF
• Tolerance: ±5%
• Voltage Rating - DC: 400V
• Dielectric Material: Polyester, Polyethylene Naphthalate (PEN), Metallized - Stacked
• Package / Case: 2420 (6050 Metric)
• Mounting Type: Surface Mount

Allowable Variations:

• Operating temperature range may extend beyond the original specification
• Voltage Rating - AC may be present in substitute parts
• Physical height may vary within package constraints
• Product status may transition from obsolete to active

The ECW-U4333V17 from Panasonic Electronic Components satisfies all mandatory matching parameters while offering extended operating temperature range (-55°C ~ 85°C) and active product status.

Parameter Comparison

Engineering Selection Recommendations

The ECW-U4333V17 serves as a direct functional equivalent to the FCN2420G333J for applications requiring 0.033 µF capacitance at 400V DC with ±5% tolerance in a 2420 surface mount package.

Selection Basis:

The substitute part maintains electrical equivalence across all critical parameters: identical capacitance, tolerance, DC voltage rating, and dielectric composition. Both components comply with ROHS3 and REACH requirements, ensuring regulatory alignment.

The ECW-U4333V17 offers operational advantages through extended low-temperature performance (-55°C versus -40°C minimum) and active product status, supporting long-term supply chain continuity. The marginal height increase (0.157" versus 0.150") remains within standard 2420 package tolerances and does not preclude direct board-level substitution.

The addition of 157V AC rating in the Panasonic component provides supplementary capability without affecting DC-biased applications.

Frequently Asked Questions (FAQ)

Q: Can the ECW-U4333V17 replace the FCN2420G333J in existing designs?

A: Yes. The ECW-U4333V17 maintains identical capacitance (0.033 µF), tolerance (±5%), DC voltage rating (400V), dielectric material, and 2420 package footprint. Both components use solder pad termination and comply with ROHS3 standards.

Q: What is the significance of the product status change from obsolete to active?

A: Active product status indicates ongoing manufacturing and supply availability. The FCN2420G333J obsolescence necessitates transition to the ECW-U4333V17 for continued procurement and production support.

Q: Does the height difference between parts affect PCB assembly?

A: The height variation (0.150" to 0.157") falls within standard 2420 package specifications. No design modification is required for direct substitution on existing PCB layouts.

Q: Are there compliance differences between the two parts?

A: Both parts are ROHS3 compliant and REACH unaffected. Both carry EAR99 export classification. No compliance barriers exist for substitution.

Q: What is the purpose of the 157V AC rating on the substitute part?

A: The ECW-U4333V17 AC rating provides additional application flexibility for circuits with AC component presence. DC-only applications utilize only the 400V DC specification, which remains identical to the original part.

Q: Is packaging format a consideration for substitution?

A: The FCN2420G333J is supplied in standard packaging, while the ECW-U4333V17 is supplied in Tape & Reel (TR) format. Both formats are compatible with automated assembly processes. Reel format may require adjustment to procurement and handling procedures.