381LR331M420K452 Equivalent & Substitute Parts Reference

Part Overview

The 381LR331M420K452 is a 330 µF, 420 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in a radial, can snap-in package. This component is classified as Active product status and is designed for general-purpose applications requiring high-voltage energy storage and filtering. The part operates across a temperature range of -25°C to 105°C with a rated lifetime of 3000 hours at 105°C. Equivalent and substitute parts are identified to provide design flexibility, inventory optimization, and supply chain continuity while maintaining electrical and mechanical compatibility within specified parameter tolerances.

Substiute Parts

381LR331M420K452

Cornell Dubilier Electronics (CDE)In Stock: 760381LR331M420K452 Datasheet

Current PartRFQ

381LR331M450K052

Cornell Dubilier Electronics (CDE)In Stock: 8651381LR331M450K052 Datasheet

SimilarRFQ

LGUW6331MELB

NichiconIn Stock: 274018LGUW6331MELB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 381LR331M420K452 are identified based on the following substitution criteria:

Primary Matching Parameters:

• Capacitance value: 330 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Package configuration: Radial, Can - Snap-In (exact match required)
• Lead spacing: 0.394" (10.00mm) (exact match required)
• Mounting type: Through Hole (exact match required)
• Operating temperature range: -25°C to 105°C (exact match or broader range acceptable)
• Lifetime rating: 3000 Hrs @ 105°C (minimum acceptable; longer lifetimes permitted)
• RoHS compliance: ROHS3 Compliant (regulatory requirement)

Voltage Rating Substitution Logic: Substitute parts with voltage ratings equal to or greater than 420 V are acceptable. Higher voltage ratings provide enhanced safety margin and are electrically compatible in applications designed for 420 V operation.

ESR and Ripple Current: ESR values and ripple current specifications are provided for reference. Substitute parts with equal or lower ESR values and equal or higher ripple current ratings are acceptable.

Manufacturer Diversity: Substitutes from different manufacturers (Cornell Dubilier Electronics and Nichicon) are included to provide supply chain alternatives while maintaining electrical and mechanical equivalence.

Parameter Comparison

Engineering Selection Recommendations

381LR331M450K052 (Cornell Dubilier Electronics): This substitute is electrically and mechanically equivalent to the main part with the exception of a higher voltage rating (450 V versus 420 V). The increased voltage rating provides additional design margin. Height dimension is 2.047" (52.00mm) compared to 1.850" (47.00mm) for the main part; PCB layout clearance must be verified. Ripple current specifications are marginally higher (1.85 A @ 120 Hz and 2.64 A @ 20 kHz). Product status is Active with ROHS3 compliance and REACH Unaffected designation. This part is suitable for direct substitution in applications where the increased height and voltage rating do not present design constraints.

LGUW6331MELB (Nichicon): This substitute provides equivalent capacitance, tolerance, voltage rating, and operating temperature range. The package configuration, lead spacing, and mounting type are identical. Height dimension is 1.772" (45.00mm), which is lower than the main part, providing potential PCB layout advantages. ESR specification is not provided for this part. Ripple current at 120 Hz is 1.45 A, which is lower than the main part specification of 1.78 A. Product status is Active with ROHS3 compliance and REACH Unaffected designation. This part is suitable for substitution in applications where the lower height and lower ripple current specification are acceptable.

Regulatory and Compliance Basis: All substitute parts maintain ROHS3 compliance and REACH Unaffected status, ensuring regulatory equivalence for applications subject to these requirements. Selection between substitutes should be based on specific application requirements regarding physical dimensions, ripple current handling, and voltage margin.

Frequently Asked Questions (FAQ)

Q: Can the 381LR331M450K052 be used in place of the 381LR331M420K452?

A: Yes. The 381LR331M450K052 is electrically compatible as a substitute. Both parts have identical capacitance (330 µF), tolerance (±20%), ESR (402 mOhm @ 120Hz), and lifetime rating (3000 Hrs @ 105°C). The substitute has a higher voltage rating (450 V versus 420 V), which is acceptable for applications designed for 420 V operation. The height dimension differs (2.047" versus 1.850"); PCB clearance must be verified before implementation.

Q: What are the physical differences between the substitute parts?

A: The 381LR331M450K052 has a maximum seated height of 2.047" (52.00mm), while the LGUW6331MELB has a maximum seated height of 1.772" (45.00mm). The main part 381LR331M420K452 has a height of 1.850" (47.00mm). All three parts share identical diameter (1.181" or 30.00mm) and lead spacing (0.394" or 10.00mm). PCB layout and clearance requirements must be evaluated for each substitute.

Q: Are there differences in ripple current handling between the parts?

A: Yes. The main part 381LR331M420K452 specifies 1.78 A @ 120 Hz and 2.54 A @ 20 kHz. The 381LR331M450K052 specifies 1.85 A @ 120 Hz and 2.64 A @ 20 kHz, providing higher ripple current capacity. The LGUW6331MELB specifies 1.45 A @ 120 Hz and 2.0735 A @ 50 kHz, providing lower ripple current capacity. Application ripple current requirements must be matched to the selected part specification.

Q: Is ESR specification available for all substitute parts?

A: ESR is specified for the main part (402 mOhm @ 120Hz) and the 381LR331M450K052 (402 mOhm @ 120Hz). ESR is not specified for the LGUW6331MELB. Applications requiring specific ESR performance should prioritize parts with published ESR values.

Q: Can these parts be used interchangeably on the same PCB?

A: Mechanical compatibility requires verification. All parts share identical lead spacing (10.00mm) and diameter (30.00mm), allowing PCB footprint compatibility. However, height differences (1.772" to 2.047") may affect component clearance, especially in confined spaces or with overlying components. PCB layout review is required before substitution.

Q: What is the significance of the voltage rating difference?

A: The 381LR331M450K052 has a 450 V rating compared to 420 V for the main part and LGUW6331MELB. A higher voltage rating provides increased safety margin and is electrically compatible in 420 V applications. No circuit modification is required when substituting a higher-voltage-rated part in a 420 V design.

Q: Are all substitute parts RoHS and REACH compliant?

A: Yes. All parts listed (381LR331M420K452, 381LR331M450K052, and LGUW6331MELB) are ROHS3 Compliant and REACH Unaffected, meeting regulatory requirements for restricted substance compliance and chemical safety.

Q: Which substitute should be selected for space-constrained applications?

A: The LGUW6331MELB offers the lowest height dimension at 1.772" (45.00mm), making it suitable for applications with vertical space constraints. However, its lower ripple current specification (1.45 A @ 120 Hz) must be verified against application requirements.

Q: Which substitute provides the highest voltage margin?

A: The 381LR331M450K052 provides the highest voltage rating at 450 V, offering a 30 V margin above the 420 V design specification. This part is suitable for applications requiring enhanced voltage safety margin.