LGU2W331MELB Equivalent & Substitute Parts

Part Overview

The LGU2W331MELB is a 330 µF, 450 V aluminum electrolytic capacitor manufactured by Nichicon in the LGU series. This radial, can-style snap-in 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 ROHS3 compliant and currently in active production status.

Equivalent and substitute parts are identified when they maintain the same electrical specifications (capacitance, voltage rating, tolerance, and lifetime rating) while potentially varying in physical dimensions, ripple current handling, or manufacturer. Substitutes enable design flexibility, supply chain continuity, and performance optimization based on application-specific requirements.

Key Parameters

Parameter	Value	Unit
Capacitance	330	µF
Voltage Rating	450	V
Tolerance	±20%	—
Lifetime @ 105°C	3000	Hrs
Operating Temperature Range	-25 to 105	°C
Polarization	Polar	—
Mounting Type	Through Hole	—
Package Type	Radial, Can - Snap-In	—
Lead Spacing	10.00	mm
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following core parameters:

Capacitance: 330 µF (exact match required)
Voltage Rating: 450 V (exact match required)
Tolerance: ±20% (exact match required)
Mounting Type: Through Hole (exact match required)
Package Type: Radial, Can - Snap-In (exact match required)
Lead Spacing: 10.00 mm (exact match required)
Operating Temperature Range: -25°C to 105°C (exact match required)
Polarization: Polar (exact match required)
RoHS Status: ROHS3 Compliant (exact match required)

Substitute parts are grouped into two categories:

Direct Substitutes maintain identical electrical and mechanical specifications, including lifetime rating (3000 Hrs @ 105°C). These parts are interchangeable without design modification.

Similar Substitutes maintain core electrical specifications but differ in one or more of the following: lifetime rating, physical dimensions (diameter or height), or ripple current capacity. These parts require application-level verification to confirm suitability.

Parameter Comparison

Part Number	Manufacturer	Series	Capacitance (µF)	Voltage (V)	Tolerance	Lifetime @ 105°C (Hrs)	Diameter (mm)	Height (mm)	Ripple Current @ 120 Hz (A)	Ripple Current @ 50 kHz (A)	Status
LGU2W331MELB	Nichicon	LGU	330	450	±20%	3000	30.00	50.00	1.45	2.0735	Active
LGN2W331MELB40	Nichicon	LGN	330	450	±20%	3000	30.00	42.00	1.38	1.9734	Active
LGG2W331MELB35	Nichicon	LGG	330	450	±20%	2000	30.00	37.00	1.2	1.716	Active
LGG2W331MELC30	Nichicon	LGG	330	450	±20%	2000	35.00	32.00	1.2	1.716	Active
LGU2W331MELC	Nichicon	LGU	330	450	±20%	3000	35.00	40.00	1.45	2.0735	Active
LGW2W331MELC35	Nichicon	LGW	330	450	±20%	3000	35.00	35.00	2.2	3.146	Active
450MXG330MEFCSN30X40	Rubycon	MXG	330	450	±20%	3000	30.00	42.00	1.75	2.45	Active
450MXK330MEFCFA30X30	Rubycon	MXK	330	450	±20%	3000	30.00	32.00	1.58	2.212	Active
450VXH330MEFCSN30X40	Rubycon	VXH	330	450	±20%	5000	30.00	42.00	1.75	2.45	Active
EKMQ451VSN331MR45S	Chemi-Con	KMQ	330	450	±20%	2000	30.00	47.00	1.38	1.9734	Active
ELXS451VSN331MR40S	Chemi-Con	LXS	330	450	±20%	5000	30.00	42.00	1.52	2.1736	Active

Engineering Selection Recommendations

Direct Substitutes (Nichicon LGU Series)

LGU2W331MELC is a direct substitute within the Nichicon LGU series. Both parts maintain 330 µF capacitance, 450 V rating, ±20% tolerance, 3000-hour lifetime at 105°C, and ROHS3 compliance. The primary difference is physical dimension: LGU2W331MELC features a 35 mm diameter and 40 mm height compared to the 30 mm diameter and 50 mm height of LGU2W331MELB. This part is suitable for applications where reduced height is beneficial while maintaining identical electrical performance.

Nichicon LGN Series Substitute

LGN2W331MELB40 maintains the 3000-hour lifetime rating and all core electrical specifications. It offers a more compact profile (42 mm height versus 50 mm) with slightly lower ripple current capacity (1.38 A @ 120 Hz versus 1.45 A). This part is suitable for space-constrained designs where the reduced ripple current does not exceed application requirements.

Nichicon LGG Series Substitutes

LGG2W331MELB35 and LGG2W331MELC30 are similar substitutes with reduced lifetime ratings (2000 hours versus 3000 hours at 105°C). Both maintain core electrical specifications and ROHS3 compliance. These parts are suitable for applications with lower thermal stress or shorter operational lifespans. LGG2W331MELB35 maintains the 30 mm diameter with 37 mm height. LGG2W331MELC30 features a 35 mm diameter with 32 mm height.

Nichicon LGW Series Substitute

LGW2W331MELC35 maintains the 3000-hour lifetime and all core electrical specifications. It offers enhanced ripple current capacity (2.2 A @ 120 Hz and 3.146 A @ 50 kHz) compared to the main part. This part is suitable for applications requiring higher ripple current handling within a compact 35 mm diameter and 35 mm height form factor.

Rubycon MXG and MXK Series Substitutes

450MXG330MEFCSN30X40 and 450MXK330MEFCFA30X30 are direct substitutes from Rubycon, maintaining 330 µF, 450 V, ±20% tolerance, and 3000-hour lifetime. Both are ROHS3 compliant. 450MXG330MEFCSN30X40 matches the 30 mm diameter with 42 mm height and offers 1.75 A ripple current at 120 Hz. 450MXK330MEFCFA30X30 provides a more compact 32 mm height with 1.58 A ripple current at 120 Hz.

Rubycon VXH Series Substitute

450VXH330MEFCSN30X40 is a direct substitute with enhanced lifetime rating (5000 hours versus 3000 hours at 105°C). It maintains all core electrical specifications and ROHS3 compliance. This part is suitable for applications requiring extended operational life or higher thermal cycling endurance.

Chemi-Con KMQ Series Substitute

EKMQ451VSN331MR45S is a similar substitute with reduced lifetime rating (2000 hours versus 3000 hours at 105°C). It maintains core electrical specifications and ROHS3 compliance with a 47 mm height profile.

Chemi-Con LXS Series Substitute

ELXS451VSN331MR40S is a direct substitute with enhanced lifetime rating (5000 hours versus 3000 hours at 105°C). It maintains all core electrical specifications and ROHS3 compliance, offering extended operational life comparable to the Rubycon VXH series.

Frequently Asked Questions (FAQ)

Q: Can LGU2W331MELC be used as a direct replacement for LGU2W331MELB?

A: Yes. Both parts maintain identical electrical specifications: 330 µF, 450 V, ±20% tolerance, 3000-hour lifetime at 105°C, and ROHS3 compliance. The primary difference is physical dimension. LGU2W331MELC has a 35 mm diameter and 40 mm height, while LGU2W331MELB has a 30 mm diameter and 50 mm height. Verify that the PCB layout and mechanical clearances accommodate the different form factor.

Q: What is the difference between LGU and LGG series capacitors?

A: The LGU series is rated for 3000 hours at 105°C, while the LGG series is rated for 2000 hours at 105°C. Both maintain the same electrical specifications (330 µF, 450 V, ±20% tolerance). The LGG series is suitable for applications with lower thermal stress or shorter operational lifespans. The LGU series provides extended operational life for demanding applications.

Q: Can I substitute a Rubycon part for a Nichicon part?

A: Yes, provided the electrical specifications match exactly. 450MXG330MEFCSN30X40, 450MXK330MEFCFA30X30, and 450VXH330MEFCSN30X40 all maintain 330 µF, 450 V, ±20% tolerance, and ROHS3 compliance. Verify ripple current capacity and physical dimensions are compatible with your application and PCB layout.

Q: What does the lifetime rating (3000 Hrs @ 105°C) mean?

A: This indicates the capacitor is rated to maintain its specified capacitance and performance for 3000 hours of continuous operation at 105°C ambient temperature. At lower operating temperatures, the actual lifetime extends significantly. This rating is used to calculate expected service life based on application thermal conditions.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All parts listed in this reference maintain ROHS3 compliance, ensuring compatibility with regulatory requirements for restricted hazardous substances.

Q: What is the significance of ripple current ratings?

A: Ripple current rating indicates the maximum AC current the capacitor can safely handle without exceeding temperature limits. Higher ripple current capacity allows the part to operate in applications with greater AC stress. Verify that your application's ripple current does not exceed the part's rated capacity at the specified frequency (120 Hz or 50 kHz).

Q: Can I use a part with a higher lifetime rating as a substitute?

A: Yes. Parts with higher lifetime ratings (5000 hours versus 3000 hours) are suitable substitutes and provide extended operational life. This is a performance enhancement with no compatibility concerns. Verify all other electrical and mechanical specifications match your application requirements.

Q: What is the difference between 450MXK330MEFCFA30X30 and 450MXG330MEFCSN30X40?

A: Both are Rubycon 330 µF, 450 V, 3000-hour rated capacitors with identical electrical specifications. The primary differences are physical dimensions and ripple current capacity. 450MXK330MEFCFA30X30 has a 32 mm height with 1.58 A ripple current at 120 Hz. 450MXG330MEFCSN30X40 has a 42 mm height with 1.75 A ripple current at 120 Hz. Select based on available PCB space and ripple current requirements.

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