Equivalent & Substitute Parts for 337LBA350M2DD

Part Overview

The 337LBA350M2DD is a 330 µF, 350 V aluminum electrolytic capacitor manufactured by Cornell Dubilier / Illinois Capacitor in the LBA series. This radial, can-style snap-in capacitor is designed for general-purpose applications with a rated lifetime of 2000 hours at 85°C and an operating temperature range of -25°C to 85°C. The part is Active in product status and RoHS3 compliant.

Substitute parts are identified when equivalent capacitance and tolerance values are maintained across the same package type and mounting configuration, with voltage ratings at or above the original specification. Substitution becomes necessary due to inventory availability, extended thermal performance requirements, or improved electrical characteristics such as reduced ESR.

Substiute Parts

337LBA350M2DD

Cornell Dubilier / Illinois CapacitorIn Stock: 785337LBA350M2DD Datasheet

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380LQ331M400K022

Cornell Dubilier Electronics (CDE)In Stock: 4181380LQ331M400K022 Datasheet

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400MXH330MEFCSN30X30

RubyconIn Stock: 1390400MXH330MEFCSN30X30 Datasheet

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450MXK330MEFCFA30X30

RubyconIn Stock: 273982450MXK330MEFCFA30X30 Datasheet

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B43642C9337M000

EPCOS - TDK ElectronicsIn Stock: 2499B43642C9337M000 Datasheet

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ESMR421VSN331MR30S

Chemi-ConIn Stock: 1150ESMR421VSN331MR30S Datasheet

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ESMR451VSN331MR30S

Chemi-ConIn Stock: 1725ESMR451VSN331MR30S Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 337LBA350M2DD are qualified based on the following criteria:

Primary Substitution Criteria:

• Capacitance: 330 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Voltage Rating: 400 V or higher (equal to or exceeding 350 V specification)
• Package Type: Radial, Can - Snap-In (exact match required)
• Lead Spacing: 0.394" (10.00mm) (exact match required)
• Physical Dimensions: 1.181" Dia (30.00mm) with height 1.260" to 1.280" (exact match required)
• Mounting Type: Through Hole (exact match required)
• Polarization: Polar (exact match required)

Secondary Compatibility Factors:

• RoHS3 Compliance (all substitutes maintain compliance)
• Moisture Sensitivity Level: 1 (Unlimited) or Not Applicable (both acceptable)
• Operating Temperature Range: -25°C minimum and 85°C minimum (all substitutes meet or exceed)
• Product Status: Active (all substitutes are active)

Five substitute parts meet these criteria across three manufacturers: Cornell Dubilier Electronics (CDE), Rubycon, EPCOS - TDK Electronics, and Chemi-Con.

Parameter Comparison

Engineering Selection Recommendations

Voltage Rating Considerations: All substitute parts carry voltage ratings of 400 V or higher, exceeding the original 350 V specification. This provides additional safety margin in applications where voltage transients or overvoltage conditions may occur. Selection of a higher voltage-rated capacitor does not degrade performance in circuits designed for 350 V operation.

Thermal Performance: The original 337LBA350M2DD specifies 2000 hours at 85°C. Substitute parts from Rubycon (400MXH330MEFCSN30X30, 450MXK330MEFCFA30X30) and EPCOS - TDK Electronics (B43642C9337M000) offer extended lifetime ratings of 3000 hours at 105°C, providing improved reliability in elevated-temperature environments. Chemi-Con substitutes (ESMR421VSN331MR30S, ESMR451VSN331MR30S) maintain the 2000-hour specification at 85°C.

ESR Characteristics: The original part exhibits 753.57 mOhm ESR at 120 Hz. The 380LQ331M400K022 (CDE) provides reduced ESR at 603 mOhm, and the B43642C9337M000 (EPCOS - TDK) offers significantly lower ESR at 270 mOhm. Lower ESR values reduce heat generation and improve ripple current handling capability.

Compliance and Certifications: All substitute parts maintain RoHS3 compliance or RoHS compliance status. All parts are REACH Unaffected and carry EAR99 ECCN classification, matching the original part's regulatory profile.

Physical Compatibility: All substitute parts maintain identical lead spacing (0.394" / 10.00mm) and primary dimensions (1.181" diameter / 30.00mm). Chemi-Con parts exhibit a maximum seated height of 1.280" (32.50mm) compared to 1.260" (32.00mm) for other substitutes. This 0.020" (0.50mm) difference must be verified against PCB layout constraints.

Moisture Sensitivity: The original part and CDE substitute carry MSL rating of 1 (Unlimited). Rubycon and EPCOS - TDK parts carry MSL Not Applicable, indicating superior moisture resistance characteristics.

Frequently Asked Questions (FAQ)

Q: Can the 380LQ331M400K022 directly replace the 337LBA350M2DD?

A: Yes. The 380LQ331M400K022 maintains identical capacitance (330 µF), tolerance (±20%), package type (Radial, Can - Snap-In), lead spacing (10.00mm), and physical dimensions. The 400 V rating exceeds the original 350 V specification. ESR is reduced from 753.57 mOhm to 603 mOhm, improving performance. Both parts carry identical operating temperature range (-25°C to 85°C) and 2000-hour lifetime at 85°C.

Q: What is the advantage of selecting the B43642C9337M000 over the original part?

A: The B43642C9337M000 provides three key improvements: (1) significantly reduced ESR of 270 mOhm compared to 753.57 mOhm, reducing heat generation; (2) extended lifetime of 3000 hours at 105°C versus 2000 hours at 85°C; (3) expanded operating temperature range of -40°C to 105°C. The 400 V rating provides additional voltage margin. Physical dimensions and lead spacing remain identical.

Q: Are the Rubycon parts suitable for high-temperature applications?

A: Yes. Both Rubycon substitutes (400MXH330MEFCSN30X30 and 450MXK330MEFCFA30X30) are rated for operation to 105°C with lifetime specifications of 2000 and 3000 hours respectively at that temperature. The 450MXK330MEFCFA30X30 offers the highest thermal rating with 3000 hours at 105°C. Both parts carry MSL Not Applicable, indicating superior moisture resistance.

Q: Why do some substitute parts not specify ESR values?

A: ESR specifications are provided by manufacturers when this parameter is critical to product differentiation or application requirements. Parts without specified ESR values meet the functional requirements for general-purpose aluminum electrolytic capacitor applications. When ESR is a critical design parameter, select parts with specified values such as the 380LQ331M400K022 (603 mOhm) or B43642C9337M000 (270 mOhm).

Q: Do the Chemi-Con parts have any dimensional differences?

A: Yes. The Chemi-Con substitutes (ESMR421VSN331MR30S and ESMR451VSN331MR30S) have a maximum seated height of 1.280" (32.50mm) compared to 1.260" (32.00mm) for the original part and most other substitutes. This 0.020" (0.50mm) difference must be verified against PCB layout and enclosure clearance requirements before selection.

Q: Can I use the ESMR451VSN331MR30S in place of the 337LBA350M2DD?

A: Yes. The ESMR451VSN331MR30S maintains identical capacitance (330 µF), tolerance (±20%), package type, and lead spacing. The 450 V rating exceeds the original 350 V specification. Operating temperature range (-25°C to 85°C) and lifetime (2000 hours at 85°C) match the original part. Verify the 0.020" additional height (1.280" vs. 1.260") against your PCB layout.

Q: Which substitute offers the best overall performance?

A: Selection depends on application requirements. For thermal performance, the 450MXK330MEFCFA30X30 (Rubycon) offers 3000 hours at 105°C. For ESR reduction, the B43642C9337M000 (EPCOS - TDK) provides 270 mOhm. For cost-effective direct replacement with improved ESR, the 380LQ331M400K022 (CDE) reduces ESR to 603 mOhm while maintaining identical dimensions and thermal specifications.

Q: Are all substitute parts in active production status?

A: Yes. All substitute parts listed carry Active product status, indicating current manufacturing and availability.