381LX331M400K452 Equivalent & Substitute Parts

Part Overview

The 381LX331M400K452 is a 330 µF, 400 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 high-voltage energy storage and filtering. The part is Active status and fully compliant with RoHS3 and REACH regulations.

Substitute parts are necessary when the primary part becomes unavailable, when alternative manufacturers are preferred for supply chain diversification, or when design specifications allow for compatible alternatives with equivalent electrical and mechanical characteristics.

Key Parameters

Parameter	Value	Unit
Capacitance	330	µF
Tolerance	±20%	—
Voltage - Rated	400	V
Lifetime @ Temperature	3000	Hrs @ 105°C
Operating Temperature Range	-25 to 105	°C
Polarization	Polar	—
Lead Spacing	10.00	mm
Diameter	30.00	mm
Height - Seated (Max)	47.00	mm
Mounting Type	Through Hole	—
Package / Case	Radial, Can - Snap-In	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 381LX331M400K452 is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

Capacitance: 330 µF (exact match required)
Voltage Rating: 400 V (exact match required)
Tolerance: ±20% (exact match required)
Polarization: Polar (exact match required)
Lifetime: 3000 Hrs @ 105°C (exact match required)
Lead Spacing: 10.00 mm (exact match required)
Mounting Type: Through Hole (exact match required)
Package Type: Radial, Can - Snap-In (exact match required)

Secondary Compatibility Parameters:

Operating Temperature Range: -25°C to 105°C (must meet or exceed)
Diameter: 30.00 mm (preferred for space constraints; alternatives with 35.00 mm diameter are acceptable if board layout permits)
Height: 47.00 mm (preferred; alternatives with different heights are acceptable if mounting clearance permits)
RoHS3 Compliance: Required
Moisture Sensitivity Level: 1 (Unlimited) or Not Applicable (acceptable)

Substitute parts are grouped into two categories: Direct Equivalents (identical electrical and mechanical specifications) and Similar Alternatives (equivalent electrical performance with acceptable dimensional variations).

Parameter Comparison

Part Number	Manufacturer	Capacitance (µF)	Voltage (V)	Tolerance	Lifetime @ 105°C	Diameter (mm)	Height (mm)	ESR @ 120 Hz	Product Status
381LX331M400K452	CDE	330	400	±20%	3000 Hrs	30.00	47.00	—	Active
381LR331M400K042	CDE	330	400	±20%	3000 Hrs	30.00	42.00	402 mOhm	Active
381LQ331M400A022	CDE	330	400	±20%	2000 Hrs	35.00	32.00	553 mOhm	Active
381LQ331M400K032	CDE	330	400	±20%	2000 Hrs	30.00	37.00	553 mOhm	Active
381LR331M400A022	CDE	330	400	±20%	3000 Hrs	35.00	32.00	402 mOhm	Active
381LX331M400A032	CDE	330	400	±20%	3000 Hrs	35.00	37.00	—	Active
381LX331M450K052	CDE	330	450	±20%	3000 Hrs	30.00	52.00	—	Active
SLP331M400E5P3	CDE	330	400	±20%	3000 Hrs	30.00	35.00	1.005 Ohm	Active
B43504A9337M000	EPCOS - TDK Electronics	330	400	±20%	3000 Hrs	30.00	47.00	270 mOhm @ 100 Hz	Not For New Designs
LGN2G331MELB35	Nichicon	330	400	±20%	3000 Hrs	30.00	37.00	—	Active
LGU2G331MELB	Nichicon	330	400	±20%	3000 Hrs	30.00	40.00	—	Active

Engineering Selection Recommendations

Direct Equivalents (Preferred for Substitution):

The following parts are direct electrical and mechanical equivalents of the 381LX331M400K452 and are recommended as primary substitutes:

381LR331M400K042 (CDE): Identical electrical specifications with 3000-hour lifetime at 105°C. Height reduced to 42.00 mm. Active product status. Suitable for space-constrained applications.
381LX331M400A032 (CDE): Identical electrical specifications with 3000-hour lifetime at 105°C. Diameter increased to 35.00 mm, height reduced to 37.00 mm. Active product status. Suitable when board layout accommodates larger diameter.
381LR331M400A022 (CDE): Identical electrical specifications with 3000-hour lifetime at 105°C. Diameter increased to 35.00 mm, height reduced to 32.00 mm. Active product status. Suitable for compact mounting spaces.
LGN2G331MELB35 (Nichicon): Equivalent electrical specifications with 3000-hour lifetime at 105°C. Manufactured by Nichicon. Active product status. Provides supply chain diversification from alternative manufacturer.
LGU2G331MELB (Nichicon): Equivalent electrical specifications with 3000-hour lifetime at 105°C. Manufactured by Nichicon. Active product status. Tray packaging available. Provides supply chain diversification.

Acceptable Alternatives (Conditional Substitution):

The following parts meet core electrical requirements but have reduced lifetime specifications or are not recommended for new designs:

381LQ331M400A022 (CDE): Reduced lifetime of 2000 hours at 105°C (versus 3000 hours). Active product status. Acceptable only if application requirements permit reduced operational life.
381LQ331M400K032 (CDE): Reduced lifetime of 2000 hours at 105°C (versus 3000 hours). Active product status. Acceptable only if application requirements permit reduced operational life.
SLP331M400E5P3 (CDE): Equivalent electrical specifications with 3000-hour lifetime at 105°C. Height reduced to 35.00 mm. Active product status. Acceptable for space-constrained applications.
B43504A9337M000 (EPCOS - TDK Electronics): Equivalent electrical specifications with 3000-hour lifetime at 105°C. Identical physical dimensions (30.00 mm diameter, 47.00 mm height). Product status is "Not For New Designs." This part is suitable only for legacy system maintenance or repair applications where the original part specification must be maintained.

Not Recommended:

381LX331M450K052 (CDE): Voltage rating increased to 450 V. While electrically compatible in 400 V applications, this part is oversized for the specified voltage and is not a direct substitute.

Frequently Asked Questions (FAQ)

Q: Can I substitute 381LR331M400K042 for 381LX331M400K452?

A: Yes. The 381LR331M400K042 is a direct electrical equivalent with identical capacitance (330 µF), voltage rating (400 V), tolerance (±20%), and lifetime (3000 hours at 105°C). The primary difference is reduced height (42.00 mm versus 47.00 mm), which is acceptable if board mounting clearance permits.

Q: What is the difference between the 381LQ series and 381LR series?

A: The 381LQ series has a lifetime rating of 2000 hours at 105°C and higher ESR (553 mOhm @ 120 Hz). The 381LR series has a lifetime rating of 3000 hours at 105°C and lower ESR (402 mOhm @ 120 Hz). The 381LR series is preferred for applications requiring extended operational life and lower impedance.

Q: Can I use a Nichicon LGU2G331MELB instead of the CDE 381LX331M400K452?

A: Yes. The LGU2G331MELB is electrically equivalent with identical capacitance, voltage rating, tolerance, and lifetime specifications. It is manufactured by Nichicon and provides supply chain diversification. The primary difference is packaging (Tray versus Bulk) and slightly different height (40.00 mm versus 47.00 mm). Verify board layout compatibility before substitution.

Q: Why is B43504A9337M000 marked "Not For New Designs"?

A: The B43504A9337M000 is a legacy product from EPCOS - TDK Electronics. While it meets all electrical and mechanical specifications of the 381LX331M400K452, its "Not For New Designs" status indicates that the manufacturer no longer recommends this part for new circuit designs. This part is suitable only for maintenance, repair, or replacement of existing systems where the original specification must be preserved.

Q: What does ESR (Equivalent Series Resistance) mean, and why does it vary between substitutes?

A: ESR is the internal resistance of the capacitor at a specified frequency. Lower ESR indicates better performance in high-frequency ripple current applications. The 381LX331M400K452 does not specify ESR, so substitutes with specified ESR values (such as 381LR331M400K042 at 402 mOhm @ 120 Hz) are acceptable. Verify that the substitute's ESR meets application requirements for ripple current handling.

Q: Can I use 381LQ331M400K032 if my application only requires 2000 hours of operation?

A: Yes. The 381LQ331M400K032 has a lifetime rating of 2000 hours at 105°C, which is acceptable if your application design life does not exceed this duration. All other electrical specifications (capacitance, voltage, tolerance) are identical to the primary part. Verify that the reduced height (37.00 mm) accommodates your board layout.

Q: What is the difference between Bulk and Tray packaging?

A: Bulk packaging typically refers to loose components or minimal packaging suitable for high-volume manufacturing. Tray packaging uses organized trays for component handling and is common in automated assembly environments. Both packaging types contain identical components; the difference is in handling and logistics. Verify your assembly process requirements before selecting a packaged alternative.

Q: Is the 381LX331M450K052 a suitable substitute for 400 V applications?

A: No. While the 381LX331M450K052 has a higher voltage rating (450 V), it is not a direct substitute for 400 V applications. Substitutes must match the specified voltage rating exactly. Using an oversized voltage rating introduces unnecessary cost and board space inefficiency.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference are RoHS3 compliant and REACH unaffected, matching the compliance status of the primary part 381LX331M400K452.

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