FCN2420E124K-B Film Capacitor Equivalent & Substitute Parts

Part Overview

The FCN2420E124K-B is a 0.12 µF film capacitor manufactured by Cornell Dubilier Electronics (CDE) rated for 250V DC operation. This surface mount component features a metallized polyester and polyethylene naphthalate (PEN) dielectric in a 2420 (6050 Metric) package with ±10% capacitance tolerance. The part is Active status and RoHS3 compliant, suitable for general purpose applications requiring stable capacitance performance across the -40°C to 85°C operating temperature range.

Equivalent and substitute parts are identified to provide design flexibility, accommodate supply chain variations, and support component standardization across manufacturing environments where electrical and mechanical specifications remain compatible.

Substiute Parts

FCN2420E124K-B

Cornell Dubilier Electronics (CDE)In Stock: 1070FCN2420E124K-B Datasheet

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ECW-U2124KC9

Panasonic Electronic ComponentsIn Stock: 4011ECW-U2124KC9 Datasheet

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ECW-U2124V16

Panasonic Electronic ComponentsIn Stock: 4045ECW-U2124V16 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FCN2420E124K-B are qualified based on the following criteria:

Mandatory Compatibility Parameters:

• Capacitance value: 0.12 µF (exact match required)
• Voltage Rating - DC: 250V (minimum requirement)
• Package / Case: 2420 (6050 Metric) (identical footprint and mounting)
• Mounting Type: Surface Mount (identical assembly method)
• Dielectric Material: Polyester, Polyethylene Naphthalate (PEN), Metallized - Stacked (same material composition)
• Termination: Solder Pads (identical connection method)
• RoHS Status: ROHS3 Compliant (regulatory compliance maintained)

Allowable Variations:

• Tolerance: May be equal or tighter (±10% or ±5%)
• Voltage Rating - AC: May be present or absent
• Operating Temperature Range: May be equal or extended
• Height - Seated (Max): Minor variations within package specification
• Manufacturer: Different qualified manufacturers permitted

The substitute parts ECW-U2124KC9 and ECW-U2124V16 from Panasonic Electronic Components meet all mandatory compatibility parameters while offering enhanced performance characteristics in specific application areas.

Parameter Comparison

Engineering Selection Recommendations

FCN2420E124K-B (Cornell Dubilier Electronics)

This is the primary reference part. Selection is appropriate for general purpose applications requiring standard ±10% tolerance and operating within the -40°C to 85°C temperature range. The part maintains Active product status with full RoHS3 compliance and REACH unaffected designation.

ECW-U2124KC9 (Panasonic Electronic Components)

This substitute part is electrically and mechanically equivalent to the FCN2420E124K-B with identical capacitance, voltage rating, tolerance, and package specifications. The ECW-U2124KC9 provides an extended operating temperature range (-55°C to 125°C) and includes AC voltage rating specification (125V AC). Selection is appropriate where extended temperature performance or AC voltage specification documentation is required. Product status is Active with ROHS3 compliance and REACH unaffected designation.

ECW-U2124V16 (Panasonic Electronic Components)

This substitute part offers tighter capacitance tolerance (±5% versus ±10%) while maintaining identical DC voltage rating, package, and mounting specifications. The ECW-U2124V16 is specified for high frequency, switching, and high pulse DV/DT applications. Height - Seated (Max) is 0.189" (4.80mm) compared to 0.185" (4.70mm) for the primary part; this variation remains within standard 2420 package specifications. Product status is Active with ROHS3 compliance and REACH unaffected designation.

All three parts are suitable for direct substitution based on electrical and mechanical compatibility. Selection between them depends on application-specific requirements for tolerance, temperature range, and performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can ECW-U2124KC9 be used as a direct replacement for FCN2420E124K-B?

A: Yes. The ECW-U2124KC9 meets all mandatory compatibility requirements: identical 0.12 µF capacitance, 250V DC voltage rating, ±10% tolerance, 2420 (6050 Metric) package, surface mount configuration, and solder pad termination. Both parts use the same dielectric material composition and maintain ROHS3 compliance.

Q: What is the difference between ECW-U2124KC9 and ECW-U2124V16?

A: The primary differences are capacitance tolerance and specified applications. ECW-U2124KC9 maintains ±10% tolerance matching the original FCN2420E124K-B, while ECW-U2124V16 provides tighter ±5% tolerance. ECW-U2124V16 is specified for high frequency, switching, and high pulse DV/DT applications. Both parts share identical capacitance, voltage rating, and package specifications.

Q: Are there height differences between these parts?

A: The FCN2420E124K-B and ECW-U2124KC9 both have a maximum seated height of 0.185" (4.70mm). The ECW-U2124V16 has a maximum seated height of 0.189" (4.80mm). This 0.004" (0.10mm) difference remains within the 2420 (6050 Metric) package specification and does not affect PCB assembly compatibility.

Q: Do all substitute parts maintain the same operating temperature range?

A: No. The FCN2420E124K-B operates from -40°C to 85°C. The ECW-U2124KC9 extends this range to -55°C to 125°C. The ECW-U2124V16 operates from -55°C to 85°C. Selection should be based on the specific application temperature requirements.

Q: Are AC voltage ratings specified for all parts?

A: The FCN2420E124K-B does not specify an AC voltage rating. Both Panasonic substitutes (ECW-U2124KC9 and ECW-U2124V16) specify 125V AC rating. If AC voltage specification is required for design documentation, the Panasonic parts provide this parameter.

Q: Do all parts maintain RoHS3 compliance?

A: Yes. The FCN2420E124K-B, ECW-U2124KC9, and ECW-U2124V16 are all ROHS3 compliant and REACH unaffected. All parts carry EAR99 ECCN classification.

Q: Can ECW-U2124V16 be used in applications requiring ±10% tolerance?

A: Yes. The ECW-U2124V16 provides ±5% tolerance, which is tighter than the ±10% requirement. A component with tighter tolerance is acceptable in applications specifying ±10% tolerance.

Q: What packaging format is used for these parts?

A: All three parts are supplied in Tape & Reel (TR) packaging suitable for automated surface mount assembly processes.