Cornell Dubilier CKR 337CKR050M Aluminum Electrolytic Capacitor

Part Overview

The Cornell Dubilier 337CKR050M is a 330 µF, 50 V radial aluminum electrolytic capacitor designed for general purpose applications. This part is currently active and available in inventory. Alternative components may be required due to design optimization, supply chain considerations, or application-specific performance requirements such as extended lifetime or improved thermal characteristics.

Substiute Parts

337CKR050M

Cornell Dubilier / Illinois CapacitorIn Stock: 690337CKR050M Datasheet

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EEU-EB1H331

Panasonic Electronic ComponentsIn Stock: 3579EEU-EB1H331 Datasheet

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UFW1J331MPD

NichiconIn Stock: 5905UFW1J331MPD Datasheet

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UKW1J331MPD

NichiconIn Stock: 1132UKW1J331MPD Datasheet

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UPW1H331MPD

NichiconIn Stock: 7683UPW1H331MPD Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 337CKR050M must maintain electrical and mechanical compatibility within the parameters listed below. The substitution criteria are based strictly on:

Mandatory Parameters for Substitution:

• Capacitance: 330 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Voltage Rating: 50 V minimum (equal or higher voltage rated components are acceptable)
• Lead Spacing: 0.197" (5.00 mm) (exact match required)
• Case Diameter: 0.394" (10.00 mm) (exact match required)
• Mounting Type: Through Hole Radial (exact match required)
• Polarization: Polar (exact match required)
• Package / Case: Radial, Can (exact match required)

Compatible Substitutes Identified:

1. Panasonic EEU-EB1H331 - Direct electrical equivalent with enhanced thermal performance
2. Nichicon UFW1J331MPD - Voltage upgraded variant with equivalent electrical characteristics
3. Nichicon UKW1J331MPD - Voltage upgraded variant with equivalent electrical characteristics
4. Nichicon UPW1H331MPD - Direct voltage and capacitance match with extended temperature range

All substitute parts meet RoHS3 compliance and maintain the same through-hole radial package geometry.

Parameter Comparison

Engineering Selection Recommendations

Panasonic EEU-EB1H331 is recommended as the primary active substitute. This part maintains the same capacitance, tolerance, and voltage rating as the Cornell Dubilier 337CKR050M while offering extended lifetime characteristics (10000 Hrs @ 105°C versus 2000 Hrs @ 85°C). The Panasonic part is actively produced and carries ROHS3 compliance. Note that this substitute has a maximum seated height of 0.866" (22.00 mm) compared to the original 0.787" (20.00 mm), which requires clearance verification in the application.

Nichicon UFW1J331MPD and Nichicon UKW1J331MPD are rated for 63 V operation, providing voltage margin above the original 50 V specification. Both parts carry the same lifetime rating as the original component (2000 Hrs @ 85°C). These substitutes carry "Not For New Designs" status, indicating they remain available but are not recommended for new product development.

Nichicon UPW1H331MPD matches the original voltage rating (50 V) and capacitance, with the added benefit of extended operating temperature range (-55°C ~ 105°C) and improved lifetime performance (5000 Hrs @ 105°C). This part also carries "Not For New Designs" status.

For new design implementations requiring the 337CKR050M functionality, the Panasonic EEU-EB1H331 is the preferred active substitute. For existing designs where height constraints are critical, the Nichicon UFW1J331MPD, UKW1J331MPD, or UPW1H331MPD maintain the original 0.787" (20.00 mm) height.

Frequently Asked Questions (FAQ)

Q: Can the Panasonic EEU-EB1H331 be used as a direct replacement for the Cornell Dubilier 337CKR050M?

A: The Panasonic EEU-EB1H331 is electrically equivalent and mechanically compatible, with identical capacitance, tolerance, voltage rating, and lead spacing. The seated height increases from 0.787" to 0.866" (22.00 mm). This height difference must be evaluated against available board clearance.

Q: What is the difference between the Nichicon UFW1J331MPD and UKW1J331MPD?

A: Both parts are identical in all specified electrical and mechanical parameters. They differ only in series designation (UFW versus UKW). Both maintain the same 330 µF capacitance, 63 V voltage rating, and 0.787" (20.00 mm) seated height as the original Cornell Dubilier part.

Q: Why do the Nichicon substitutes have a 63 V rating instead of 50 V?

A: The Nichicon UFW1J331MPD and UKW1J331MPD are rated for 63 V operation, which exceeds the original 50 V specification. In applications operating at or below 50 V, these parts are functionally equivalent and provide additional voltage margin for system reliability.

Q: Can any substitute part be used in a new design?

A: Only the Panasonic EEU-EB1H331 carries active product status. The Nichicon UFW1J331MPD, UKW1J331MPD, and UPW1H331MPD all carry "Not For New Designs" status, meaning they remain available for replacement and legacy applications but are not recommended for new product development. New designs should specify the Panasonic EEU-EB1H331.

Q: What are the mechanical constraints for substitution?

A: All substitute parts maintain identical lead spacing (0.197", 5.00 mm) and case diameter (0.394", 10.00 mm). The only mechanical variation is the Panasonic EEU-EB1H331, which has a maximum seated height of 0.866" (22.00 mm) compared to 0.787" (20.00 mm) for the original part and all other substitutes.

Q: Are all substitutes RoHS3 compliant?

A: Yes, all identified substitute parts meet RoHS3 compliance. Compliance certifications match the original Cornell Dubilier 337CKR050M.