LGW2G331MELB40 Equivalent & Substitute Parts

Part Overview

The LGW2G331MELB40 is a 330 µF, 400 V aluminum electrolytic capacitor manufactured by Nichicon in the LGW series. This radial, can-style snap-in capacitor 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 in production with ROHS3 compliance and extensive inventory availability. Equivalent and substitute parts are identified based on matching electrical specifications (capacitance, voltage rating, tolerance, and lifetime rating) and mechanical compatibility (lead spacing, mounting type, and package style).

Key Parameters

Parameter	Value
Manufacturer Part Number	LGW2G331MELB40
Manufacturer	Nichicon
Series	LGW
Capacitance	330 µF
Tolerance	±20%
Voltage - Rated	400 V
Lifetime @ Temperature	3000 Hrs @ 105°C
Operating Temperature Range	-25°C ~ 105°C
Lead Spacing	0.394" (10.00 mm)
Size / Dimension	1.181" Dia (30.00 mm)
Height - Seated (Max)	1.575" (40.00 mm)
Mounting Type	Through Hole
Package / Case	Radial, Can - Snap-In
Polarization	Polar
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the LGW2G331MELB40 is determined by the following critical parameters:

Primary Electrical Criteria:

Capacitance: 330 µF (exact match required)
Voltage Rating: 400 V (exact match required)
Tolerance: ±20% (exact match required)
Lifetime Rating: 3000 Hrs @ 105°C (preferred for direct replacement)

Mechanical Compatibility Criteria:

Lead Spacing: 0.394" (10.00 mm) (exact match required for PCB fit)
Mounting Type: Through Hole (exact match required)
Package Style: Radial, Can - Snap-In (exact match required)
Polarization: Polar (exact match required)

Compliance & Status:

Product Status: Active (all substitutes must be active)
RoHS Status: ROHS3 Compliant (all substitutes must maintain compliance)

Substitute parts are grouped into two categories:

Category A - Direct Equivalents (3000 Hrs @ 105°C): Parts with identical lifetime ratings and electrical specifications. These include Nichicon LGU and LGN series variants, and are fully interchangeable with no derating considerations.

Category B - Functional Alternatives (2000 Hrs @ 105°C): Nichicon LGG series parts with reduced lifetime ratings. These are mechanically compatible but have lower thermal endurance and should only be selected when application duty cycle permits reduced lifetime.

Category C - Cross-Manufacturer Alternatives: Cornell Dubilier Electronics (CDE) 381LQ series parts meeting all electrical and mechanical specifications with documented ESR values.

Parameter Comparison

Part Number	Manufacturer	Series	Capacitance	Voltage	Tolerance	Lifetime @ 105°C	Diameter (mm)	Height (mm)	Lead Spacing (mm)	Ripple Current @ 120 Hz	Ripple Current @ 50 kHz	RoHS Status
LGW2G331MELB40	Nichicon	LGW	330 µF	400 V	±20%	3000 Hrs	30.00	40.00	10.00	2.33 A	3.3319 A	ROHS3
LGU2G331MELB	Nichicon	LGU	330 µF	400 V	±20%	3000 Hrs	30.00	40.00	10.00	1.44 A	2.0592 A	ROHS3
LGU2G331MELC	Nichicon	LGU	330 µF	400 V	±20%	3000 Hrs	35.00	30.00	10.00	1.44 A	2.0592 A	ROHS3
LGN2G331MELB35	Nichicon	LGN	330 µF	400 V	±20%	3000 Hrs	30.00	37.00	10.00	1.44 A	2.0592 A	ROHS3
LGN2G331MELA45	Nichicon	LGN	330 µF	400 V	±20%	3000 Hrs	25.00	47.00	10.00	1.44 A	2.0592 A	ROHS3
LGW2G331MELA50	Nichicon	LGW	330 µF	400 V	±20%	3000 Hrs	25.00	50.00	10.00	2.12 A	3.0316 A	ROHS3
LGU2G331MELA	Nichicon	LGU	330 µF	400 V	±20%	3000 Hrs	25.00	50.00	10.00	1.44 A	2.0592 A	ROHS3
LGG2G331MELA40	Nichicon	LGG	330 µF	400 V	±20%	2000 Hrs	25.00	42.00	10.00	1.15 A	1.6445 A	ROHS3
LGG2G331MELZ50	Nichicon	LGG	330 µF	400 V	±20%	2000 Hrs	22.00	52.00	10.00	1.15 A	1.6445 A	ROHS3
381LQ331M400A022	Cornell Dubilier Electronics	381LQ	330 µF	400 V	±20%	2000 Hrs	35.00	32.00	10.00	1.44 A	—	ROHS3
381LQ331M400K032	Cornell Dubilier Electronics	381LQ	330 µF	400 V	±20%	2000 Hrs	30.00	37.00	10.00	1.44 A	2.02 A	ROHS3

Engineering Selection Recommendations

For Direct Replacement (No Derating):

Select LGU2G331MELB when identical form factor and electrical performance are required. This part matches the LGW2G331MELB40 in capacitance, voltage, tolerance, lifetime rating, and physical dimensions (30 mm diameter, 40 mm height). Both are Nichicon products with active status and ROHS3 compliance. The LGU2G331MELB is available in Tray packaging, while the main part is supplied in Bulk.

For Space-Constrained Applications:

LGU2G331MELC provides the same electrical specifications and lifetime rating with a larger diameter (35 mm) but reduced height (30 mm), suitable for applications where vertical clearance is limited.

LGN2G331MELB35 offers identical electrical performance with a compact 30 mm diameter and 37 mm height, providing a minimal-footprint alternative.

For Reduced Ripple Current Tolerance:

LGW2G331MELA50 maintains the LGW series ripple current performance (2.12 A @ 120 Hz, 3.0316 A @ 50 kHz) with a smaller diameter (25 mm) and extended height (50 mm). This variant is suitable when ripple current handling is a primary design constraint.

For Reduced Lifetime Applications (2000 Hrs @ 105°C):

LGG2G331MELA40 and LGG2G331MELZ50 are functionally compatible alternatives with reduced thermal endurance. These parts are suitable only for applications with duty cycles that do not require 3000-hour lifetime ratings. Both maintain ROHS3 compliance and active product status.

For Cross-Manufacturer Sourcing:

381LQ331M400K032 (Cornell Dubilier Electronics) provides electrical equivalence with documented ESR specification (553 mOhm @ 120 Hz) and 2000-hour lifetime rating. This part is suitable for applications requiring multi-source qualification or when Nichicon availability is constrained. The 30 mm diameter and 37 mm height provide close mechanical compatibility.

All recommended substitutes maintain ROHS3 compliance, active product status, and through-hole mounting with 10 mm lead spacing.

Frequently Asked Questions (FAQ)

Q: Can LGG series parts (2000 Hrs @ 105°C) be used as direct replacements for the LGW2G331MELB40 (3000 Hrs @ 105°C)?

A: LGG series parts are mechanically and electrically compatible but have a reduced thermal lifetime rating. They are suitable only for applications where the duty cycle does not require 3000-hour endurance at 105°C. If the application operates continuously at elevated temperatures, the LGG series will reach end-of-life sooner than the original specification. Verify application thermal profile before substitution.

Q: What is the significance of the diameter and height variations among substitute parts?

A: Diameter and height determine physical fit on the PCB and clearance to adjacent components. The LGW2G331MELB40 has a 30 mm diameter and 40 mm height. Substitutes with different dimensions (such as LGN2G331MELA45 at 25 mm diameter, 47 mm height) may require PCB layout verification to confirm adequate clearance. Lead spacing (10 mm) remains constant across all substitutes, ensuring hole alignment compatibility.

Q: Are Nichicon LGU and LGN series parts interchangeable with the LGW series?

A: LGU and LGN series parts are electrically and mechanically compatible with the LGW series when capacitance, voltage, tolerance, and lifetime ratings match. However, ripple current ratings differ between series. The LGW series (2.33 A @ 120 Hz) has higher ripple current capacity than LGU and LGN series (1.44 A @ 120 Hz). Select based on application ripple current requirements.

Q: Can Cornell Dubilier 381LQ series parts replace Nichicon parts?

A: Yes, 381LQ331M400K032 is electrically and mechanically equivalent with matching capacitance, voltage, tolerance, and lead spacing. However, the lifetime rating is 2000 hours at 105°C versus 3000 hours for the original part. Additionally, ESR is specified for the CDE part (553 mOhm @ 120 Hz) but not provided for Nichicon variants. Verify ESR compatibility with circuit design requirements before substitution.

Q: What does the packaging designation (Bulk vs. Tray) mean for substitution?

A: Bulk and Tray refer to shipping and handling packaging only. They do not affect electrical or mechanical performance. The LGW2G331MELB40 is supplied in Bulk packaging, while LGU2G331MELB is available in Tray packaging. Both parts are identical in form, fit, and function. Packaging selection is based on procurement and inventory management requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all substitute parts listed are ROHS3 compliant and maintain the same environmental compliance status as the LGW2G331MELB40. All parts are active in production and suitable for new designs.

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