FCN2420E104K-B Equivalent & Substitute Parts

Part Overview

The FCN2420E104K-B is a 0.1 µF film capacitor manufactured by Cornell Dubilier Electronics (CDE) with a 250V DC rating, designed for general purpose applications in surface mount configurations. This component features a polyester and polyethylene naphthalate (PEN) metallized dielectric system in a 2420 (6050 metric) package format. The part maintains active product status with ROHS3 compliance and REACH unaffected certification. Alternative equivalent parts are available to address supply chain requirements, design optimization needs, or performance specification flexibility.

Substiute Parts

FCN2420E104K-B

Cornell Dubilier Electronics (CDE)In Stock: 675FCN2420E104K-B Datasheet

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ECW-U2104JC9

Panasonic Electronic ComponentsIn Stock: 6951ECW-U2104JC9 Datasheet

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ECW-U2104KC9

Panasonic Electronic ComponentsIn Stock: 14953ECW-U2104KC9 Datasheet

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ECW-U2104V16

Panasonic Electronic ComponentsIn Stock: 2490ECW-U2104V16 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FCN2420E104K-B is determined by the following critical parameters:

Core Substitution Criteria:

• Capacitance: 0.1 µF (must match exactly)
• Voltage Rating – DC: 250V minimum (equal or greater)
• Package / Case: 2420 (6050 Metric) (must match exactly)
• Dielectric Material: Polyester, Polyethylene Naphthalate (PEN), Metallized – Stacked (must match)
• Mounting Type: Surface Mount (must match)
• Termination: Solder Pads (must match)

Flexibility Parameters:

• Tolerance: ±5% or ±10% are compatible (tighter tolerance represents upgrade)
• Operating Temperature Range: Original −40°C to +85°C; substitutes with −55°C to +125°C represent extended capability
• Voltage Rating – AC: 125V AC available in substitute options (original specification does not define AC rating)

All three substitute parts meet the core substitution criteria. The ECW-U2104JC9 and ECW-U2104V16 offer ±5% tolerance (improved precision) compared to the original ±10% specification. The Panasonic ECW-U series substitutes provide extended operating temperature ranges.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts—ECW-U2104JC9, ECW-U2104KC9, and ECW-U2104V16—maintain active product status consistent with the FCN2420E104K-B and carry full ROHS3 compliance and REACH unaffected certifications. Selection between the original part and substitutes should be based on design requirements regarding tolerance specification and operating temperature limits.

The ECW-U2104KC9 provides equivalent tolerance (±10%) to the original with extended thermal range (−55°C to +125°C), representing a direct specification upgrade. The ECW-U2104JC9 and ECW-U2104V16 both offer improved tolerance specification at ±5%, with ECW-U2104JC9 providing the broadest operating temperature range (−55°C to +125°C).

For applications constrained to the original −40°C to +85°C temperature window, the ECW-U2104V16 maintains this specification while providing ±5% tolerance precision. Height considerations apply only when board clearance is critical; ECW-U2104JC9 and ECW-U2104KC9 are 0.004" shorter (4.00 mm vs. 4.10 mm).

Frequently Asked Questions (FAQ)

Q: Can I use ECW-U2104JC9, ECW-U2104KC9, or ECW-U2104V16 as direct replacements for FCN2420E104K-B?

A: Yes, all three Panasonic parts are direct electrical and mechanical substitutes. They share identical capacitance (0.1 µF), DC voltage rating (250V), package format (2420 metric), and dielectric composition. Substitution compatibility is confirmed across all core electrical and mechanical parameters.

Q: What is the difference between the three Panasonic alternatives?

A: The primary differences are tolerance specification and operating temperature range. ECW-U2104KC9 matches the original ±10% tolerance with extended temperature capability (−55°C to +125°C). ECW-U2104JC9 and ECW-U2104V16 offer tighter ±5% tolerance; ECW-U2104JC9 extends to −55°C while ECW-U2104V16 maintains the original −40°C lower limit.

Q: Are there package or footprint differences I need to consider?

A: All parts use the 2420 (6050 metric) package with identical lateral dimensions (6.00 mm × 5.00 mm). Height differences are minimal: ECW-U2104JC9 and ECW-U2104KC9 are 4.00 mm seated height versus 4.10 mm for the original FCN2420E104K-B and ECW-U2104V16. This 0.10 mm difference affects board clearance only in space-constrained designs.

Q: What does the ±5% tolerance specification mean for circuit performance?

A: Tolerance specification defines the maximum deviation from nominal capacitance value across the operating range. ±5% tolerance (ECW-U2104JC9 and ECW-U2104V16) provides tighter capacitance control than ±10% (original FCN2420E104K-B and ECW-U2104KC9), resulting in improved circuit consistency where precise capacitance values influence frequency response or timing characteristics.

Q: Are all parts certified for RoHS compliance?

A: Yes, the FCN2420E104K-B and all three Panasonic substitutes carry full ROHS3 compliance certification and are REACH unaffected. These parts meet current environmental and hazardous substance restriction requirements.

Q: Which substitute should I select for extended temperature operation?

A: ECW-U2104JC9 provides the widest operating range (−55°C to +125°C). If the −40°C lower limit is sufficient for your application, ECW-U2104V16 offers ±5% tolerance at the original lower temperature threshold.