Equivalent & Substitute Parts for 381LX331M350A022

Part Overview

The 381LX331M350A022 is a 330 µF, 350 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in a radial, can snap-in package. This component is rated for 3000 hours at 105°C and is designed for general-purpose applications requiring through-hole mounting. The part maintains Active product status with full RoHS3 compliance and REACH unaffected designation.

Substitute parts are identified to address application requirements including higher voltage ratings, improved ripple current handling, or alternative manufacturer sourcing while maintaining core electrical and mechanical compatibility within the 330 µF capacitance class.

Substiute Parts

381LX331M350A022

Cornell Dubilier Electronics (CDE)In Stock: 967381LX331M350A022 Datasheet

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381LR331M400A022

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

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381LX331M400A032

Cornell Dubilier Electronics (CDE)In Stock: 1374381LX331M400A032 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 logic for the 381LX331M350A022 is based on the following criteria:

Electrical Compatibility Requirements:

• Capacitance must equal 330 µF
• Tolerance must be ±20% or tighter
• Voltage rating must be ≥350 V (higher ratings are acceptable for drop-in replacement)
• Lifetime must be ≥3000 hours at 105°C
• Operating temperature range must encompass -25°C to 105°C
• Polarization must remain Polar

Mechanical Compatibility Requirements:

• Package type must be Radial, Can - Snap-In
• Lead spacing must be 0.394" (10.00 mm)
• Diameter must be 1.378" (35.00 mm)
• Mounting type must be Through Hole
• Height variation is acceptable if within physical envelope constraints

Regulatory Compliance:

• RoHS3 compliance required
• REACH unaffected status required

Substitute parts identified fall into two categories: voltage-upgraded variants (400 V and 420 V ratings) from CDE and Nichicon, and cross-manufacturer alternatives from EPCOS-TDK Electronics. All substitutes maintain identical capacitance, tolerance, temperature range, and mechanical form factor.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Same Voltage Rating): No substitute parts maintain the exact 350 V rating. The 381LX331M350A022 is the only option for applications with strict 350 V specification.

For Voltage-Upgraded Applications (≥350 V Required):

381LR331M400A022 - Cornell Dubilier Electronics 400 V variant

• Maintains identical mechanical form factor and lead spacing
• Increases voltage rating to 400 V
• Improves ripple current handling: 1.71 A @ 120 Hz and 2.44 A @ 20 kHz
• Active product status with full RoHS3 compliance
• Recommended for applications requiring enhanced voltage margin

381LX331M400A032 - Cornell Dubilier Electronics 400 V variant

• Same series as main part (381LX)
• Increases voltage rating to 400 V
• Height increases to 1.457" (37.00 mm) - verify clearance in application
• Active product status with full RoHS3 compliance
• Suitable when height increase is acceptable

LQSW6331MELC30 - Nichicon 420 V variant

• Highest voltage rating at 420 V
• Maintains identical height and diameter
• Active product status with full RoHS3 compliance
• Recommended for applications requiring maximum voltage headroom

B43254C9337M000 - EPCOS-TDK Electronics 400 V variant

• Cross-manufacturer alternative with 400 V rating
• Maintains identical mechanical specifications
• Product status: Not For New Designs - use only for legacy system maintenance or repair
• RoHS3 compliant but not recommended for new designs

Regulatory Compliance: All substitute parts maintain ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for electronic component sourcing.

Frequently Asked Questions (FAQ)

Q: Can I use a 400 V rated capacitor in place of the 350 V 381LX331M350A022?

A: Yes. Higher voltage-rated capacitors are electrically compatible for drop-in replacement. The 381LR331M400A022, 381LX331M400A032, and B43254C9337M000 all provide 400 V ratings suitable for 350 V applications. Verify mechanical clearance, particularly for the 381LX331M400A032 which has increased height.

Q: What is the difference between 381LR331M400A022 and 381LX331M400A032?

A: Both are 330 µF, 400 V Cornell Dubilier capacitors with identical lead spacing and diameter. The 381LR series (381LR331M400A022) maintains the original 1.260" height and provides higher ripple current capability (1.71 A @ 120 Hz). The 381LX series (381LX331M400A032) increases height to 1.457" but remains within the same package family. Select based on available PCB clearance.

Q: Is the EPCOS B43254C9337M000 suitable for new product designs?

A: No. The B43254C9337M000 carries a "Not For New Designs" product status. It is suitable only for maintenance, repair, or legacy system support. For new designs, select from Active status parts: 381LR331M400A022, 381LX331M400A032, or LQSW6331MELC30.

Q: What are the ripple current differences between substitute parts?

A: Ripple current capacity varies across substitutes. The 381LR331M400A022 provides the highest low-frequency ripple current at 1.71 A @ 120 Hz and 2.44 A @ 20 kHz. The LQSW6331MELC30 (Nichicon) provides 1.42 A @ 120 Hz and 2.0306 A @ 50 kHz. Select based on application ripple current requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All identified substitute parts—381LR331M400A022, 381LX331M400A032, B43254C9337M000, and LQSW6331MELC30—maintain ROHS3 compliance and REACH unaffected status.

Q: Can I substitute the Nichicon LQSW6331MELC30 for the Cornell Dubilier 381LX331M350A022?

A: Yes. The LQSW6331MELC30 maintains identical capacitance (330 µF), tolerance (±20%), temperature range (-25°C to 105°C), lifetime (3000 Hrs @ 105°C), mechanical form factor, and lead spacing. It provides a higher 420 V rating. Cross-manufacturer substitution is electrically and mechanically compatible.

Q: What should I verify before implementing a substitute part?

A: Verify the following: (1) PCB clearance for height variations, particularly for 381LX331M400A032 at 1.457" height; (2) application voltage requirement does not exceed the substitute's rating; (3) ripple current demand is met by the substitute's specifications; (4) product status is Active for new designs; (5) regulatory compliance (RoHS3, REACH) matches procurement requirements.