Equivalent & Substitute Parts for 337LMB350M2ED

Part Overview

The 337LMB350M2ED is a 330 µF, 350 V aluminum electrolytic capacitor manufactured by Cornell Dubilier / Illinois Capacitor in the LMB series. This radial, can-type snap-in capacitor is designed for general-purpose applications with a rated lifetime of 3000 hours at 105°C and an operating temperature range of -25°C to 105°C. The part is currently active in production and ROHS3 compliant.

Substitute parts are identified when equivalent capacitance and tolerance values are maintained while voltage ratings, ESR characteristics, or ripple current specifications may vary within acceptable engineering parameters. Substitution becomes necessary due to inventory availability, supply chain optimization, or performance requirements in specific circuit applications.

Substiute Parts

337LMB350M2ED

Cornell Dubilier / Illinois CapacitorIn Stock: 1219337LMB350M2ED Datasheet

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381LR331M400A022

Cornell Dubilier Electronics (CDE)In Stock: 600219381LR331M400A022 Datasheet

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B43254C9337M000

EPCOS - TDK ElectronicsIn Stock: 1196B43254C9337M000 Datasheet

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LQSW6331MELC30

NichiconIn Stock: 274056LQSW6331MELC30 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of aluminum electrolytic capacitors is determined by the following critical parameters:

Primary Substitution Criteria:

• Capacitance value: 330 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Voltage rating: Equal to or greater than 350 V
• Package type: Radial, Can - Snap-In (exact match required)
• Lead spacing: 10.00 mm (exact match required)
• Case diameter: 35.00 mm (exact match required)
• Height - Seated: 32.00 mm (exact match required)
• Mounting type: Through Hole (exact match required)
• Operating temperature range: -25°C to 105°C minimum (exact match required)
• Lifetime: 3000 Hrs @ 105°C minimum (exact match required)

Secondary Compatibility Parameters:

• ESR and ripple current values may vary within application-specific limits
• Manufacturer and series designation may differ
• RoHS and REACH compliance status must be maintained

The three substitute parts listed below meet all primary substitution criteria and maintain full mechanical and electrical compatibility with the 337LMB350M2ED.

Parameter Comparison

Engineering Selection Recommendations

381LR331M400A022 (Cornell Dubilier Electronics)

This substitute offers a voltage rating increase from 350 V to 400 V while maintaining identical capacitance, tolerance, and physical dimensions. The ESR is reduced to 402 mOhm at 120 Hz, providing improved performance characteristics. The part is active in production status and ROHS3 compliant. This substitute is suitable for applications requiring higher voltage margin or improved ESR performance.

B43254C9337M000 (EPCOS - TDK Electronics)

This substitute maintains 330 µF capacitance and ±20% tolerance with a 400 V voltage rating. Physical dimensions and mounting specifications are identical to the main part. However, this part carries a "Not For New Designs" product status, indicating it is in mature or declining production phase. This substitute is appropriate only for legacy system maintenance or replacement applications where design continuity is required.

LQSW6331MELC30 (Nichicon)

This substitute provides the highest voltage rating at 420 V while maintaining all other critical specifications. The part is active in production and ROHS3 compliant. Ripple current capability at 120 Hz is 1.42 A, exceeding the main part specification. This substitute is suitable for applications requiring maximum voltage headroom or enhanced ripple current handling.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a higher voltage rating than the original 337LMB350M2ED?

A: Yes. All three substitute parts feature voltage ratings of 400 V or 420 V, which exceed the original 350 V specification. Higher voltage ratings provide additional safety margin in the circuit and do not compromise compatibility when all other parameters match.

Q: Are the physical dimensions identical across all substitute parts?

A: Yes. All substitute parts maintain the same case diameter (35.00 mm), height (32.00 mm), and lead spacing (10.00 mm) as the 337LMB350M2ED. Direct mechanical substitution is possible without PCB layout modifications.

Q: What is the significance of the "Not For New Designs" status on the B43254C9337M000?

A: This designation indicates the part is in mature production phase and may have limited availability for new projects. It is suitable for replacement or maintenance of existing systems but should not be selected for new circuit designs where active-status alternatives are available.

Q: How do ESR differences affect circuit performance?

A: ESR (Equivalent Series Resistance) influences ripple voltage, heat dissipation, and transient response. The 381LR331M400A022 features significantly lower ESR (402 mOhm) compared to the main part (1.25596 Ohm), resulting in reduced ripple voltage and improved high-frequency performance. The other substitutes do not specify ESR values.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All three substitute parts are ROHS3 compliant and REACH unaffected, maintaining full regulatory compliance with the original 337LMB350M2ED.

Q: Can I interchange these parts without circuit redesign?

A: Yes. All substitute parts are mechanically and electrically compatible with the 337LMB350M2ED. They feature identical lead spacing, case dimensions, mounting type, and operating temperature range. No PCB modifications or circuit redesign is required.