381LQ331M450K042 Equivalent & Substitute Parts Reference

Part Overview

The 381LQ331M450K042 is a 330 µF, 450 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in a radial, can snap-in package. This component is designed for general-purpose applications requiring high-voltage energy storage and filtering. The part is Active status and RoHS3 compliant, suitable for industrial and commercial equipment operating across -25°C to 105°C temperature ranges.

Equivalent and substitute parts are necessary when the original manufacturer part becomes unavailable, when supply chain optimization is required, or when design specifications allow for alternative components with compatible electrical and mechanical characteristics. Substitute selection must maintain compatibility with the 450 V rated voltage, 330 µF capacitance value, ±20% tolerance, radial snap-in package configuration, and through-hole mounting requirements.

Substiute Parts

381LQ331M450K042

Cornell Dubilier Electronics (CDE)In Stock: 865381LQ331M450K042 Datasheet

Current PartRFQ

450MXG330MEFCSN30X40

RubyconIn Stock: 20294450MXG330MEFCSN30X40 Datasheet

DirectRFQ

450MXK330MEFCFA30X30

RubyconIn Stock: 273982450MXK330MEFCFA30X30 Datasheet

DirectRFQ

450VXH330MEFCSN30X40

RubyconIn Stock: 100452450VXH330MEFCSN30X40 Datasheet

DirectRFQ

B43508B5337M000

EPCOS - TDK ElectronicsIn Stock: 139341B43508B5337M000 Datasheet

DirectRFQ

B43644A5337M000

EPCOS - TDK ElectronicsIn Stock: 2807B43644A5337M000 Datasheet

DirectRFQ

ELXS451VSN331MR40S

Chemi-ConIn Stock: 1373ELXS451VSN331MR40S Datasheet

DirectRFQ

LGN2W331MELB40

NichiconIn Stock: 1000140LGN2W331MELB40 Datasheet

DirectRFQ

LQS2W331MELB40

NichiconIn Stock: 1000155LQS2W331MELB40 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the 381LQ331M450K042 is based strictly on the following critical parameters:

Mandatory Matching Parameters:

• Capacitance: 330 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Voltage Rating: 450 V (exact match required)
• Package Type: Radial, Can - Snap-In (exact match required)
• Mounting: Through Hole (exact match required)
• Lead Spacing: 0.394" (10.00mm) (exact match required)
• Diameter: 1.181" (30.00mm) (exact match required)
• Operating Temperature Range: -25°C to 105°C minimum (equal or wider range acceptable)
• Polarization: Polar (exact match required)
• RoHS Compliance: ROHS3 Compliant (exact match required)

Secondary Parameters (Non-Critical for Substitution):

• ESR (Equivalent Series Resistance): Varies by manufacturer; lower ESR indicates better performance but does not prevent substitution
• Lifetime @ Temperature: Varies (2000 to 5000 hours @ 105°C); longer lifetime is beneficial but not required for substitution eligibility
• Ripple Current Ratings: Varies by frequency and manufacturer; must be verified for specific application requirements

All substitute parts listed meet the mandatory matching parameters. Differences in ESR, lifetime, and ripple current ratings reflect manufacturer design variations and do not disqualify parts from substitution consideration.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts are Active status components with ROHS3 compliance, meeting regulatory requirements for current applications. Selection among substitutes should be based on the following engineering criteria derived from provided specifications:

For Applications Requiring Extended Operational Life: B43644A5337M000 (EPCOS - TDK Electronics) and 450VXH330MEFCSN30X40 (Rubycon) both provide 5000-hour lifetime ratings at 105°C, compared to the original 381LQ331M450K042 at 2000 hours. These parts are suitable for long-duration service applications.

For Applications with Compact Space Constraints: 450MXK330MEFCFA30X30 (Rubycon) features a reduced height of 1.260" (32.00mm) versus the standard 1.654" (42.00mm), providing space savings while maintaining all other critical parameters.

For Applications Operating Below -25°C: B43508B5337M000 and B43644A5337M000 (both EPCOS - TDK Electronics) support operating temperatures down to -40°C, extending the lower temperature limit compared to the original part's -25°C minimum.

For High-Volume Supply Availability: LGN2W331MELB40 and LQS2W331MELB40 (Nichicon) report inventory levels exceeding 1,000,000 pieces, providing supply chain security for high-volume production requirements.

All substitute parts maintain identical capacitance, voltage rating, tolerance, package configuration, lead spacing, and diameter specifications. Substitution is mechanically and electrically compatible without circuit redesign.

Frequently Asked Questions (FAQ)

Q1: Can I substitute 450MXK330MEFCFA30X30 for 381LQ331M450K042 in a PCB with fixed mounting hole spacing?

A: Yes, the 450MXK330MEFCFA30X30 maintains the same lead spacing of 0.394" (10.00mm) and diameter of 1.181" (30.00mm). However, the reduced height of 1.260" (32.00mm) versus 1.654" (42.00mm) may affect clearance with adjacent components. Verify PCB layout clearance before substitution.

Q2: What is the difference between ESR specifications listed for some parts and "Not Specified" for others?

A: ESR (Equivalent Series Resistance) is a manufacturer-specific performance characteristic. Parts with specified ESR values (such as B43644A5337M000 at 90mOhm @ 100Hz) provide documented performance data. Parts with unspecified ESR are still electrically equivalent for the 330 µF, 450 V application but do not publish this secondary parameter. Substitution is valid in both cases.

Q3: Is the extended lifetime of 5000 hours @ 105°C required for substitution?

A: No. The original 381LQ331M450K042 specifies 2000 hours @ 105°C. Substitute parts with 3000 or 5000-hour ratings are compatible and represent equal or superior performance. Extended lifetime is not a substitution requirement but may be beneficial for applications requiring long service intervals.

Q4: Can I use B43508B5337M000 or B43644A5337M000 in equipment designed for -25°C minimum operating temperature?

A: Yes. Both EPCOS - TDK Electronics parts support -40°C to 105°C operating range, which exceeds the original -25°C to 105°C specification. The wider temperature range ensures compatibility and provides additional margin for cold-environment applications.

Q5: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliant certification, matching the original 381LQ331M450K042. This ensures regulatory compliance for applications subject to RoHS directives.

Q6: What mounting considerations apply when substituting these parts?

A: All parts are Through Hole mounted with identical lead spacing (0.394" / 10.00mm) and snap-in can package configuration. No PCB redesign is required. Verify that the PCB footprint accommodates the specific height of the substitute part, particularly when using 450MXK330MEFCFA30X30 with reduced height.

Q7: Can I mix different substitute parts in the same equipment design?

A: Yes. All substitute parts meet identical electrical specifications (330 µF, 450 V, ±20% tolerance) and mechanical requirements (radial snap-in package, through-hole mounting, 10.00mm lead spacing, 30.00mm diameter). Mixing different manufacturers or series is electrically and mechanically compatible.