LAK2G331MELB50 Equivalent & Substitute Parts

Part Overview

The LAK2G331MELB50 is a 330 µF, 400 V aluminum electrolytic capacitor manufactured by Nichicon in the LAK series. This radial, can-style snap-in capacitor is rated for 2000 hours at 105°C and is designed for general-purpose applications requiring high-voltage energy storage and filtering. The part is active and ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications (capacitance, voltage rating, tolerance) and mechanical compatibility (package type, lead spacing, mounting configuration) while accounting for variations in lifetime ratings and ripple current performance.

Key Parameters

Parameter	LAK2G331MELB50
Capacitance	330 µF
Voltage Rating	400 V
Tolerance	±20%
Lifetime @ 105°C	2000 Hrs
Operating Temperature Range	-25°C ~ 105°C
Package Type	Radial, Can - Snap-In
Lead Spacing	0.394" (10.00 mm)
Diameter	1.181" (30.00 mm)
Height	2.047" (52.00 mm)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution is determined by three core criteria:

Electrical Compatibility: Capacitance (330 µF), voltage rating (400 V), and tolerance (±20%) must match exactly. These parameters ensure functional equivalence in the circuit.

Mechanical Compatibility: Package type (radial, can-style snap-in), lead spacing (10.00 mm), diameter (30.00 mm), and mounting type (through hole) must be identical to ensure physical fit on the PCB.

Performance Characteristics: Lifetime rating, ripple current capacity, and ESR may vary among substitutes. Parts are grouped by these secondary characteristics to support application-specific selection.

Substitutes are organized into three categories:

Direct Equivalents: Same electrical and mechanical specifications with variations in lifetime or ripple current.
Upgraded Alternatives: Enhanced lifetime or voltage rating while maintaining core electrical and mechanical compatibility.
Cross-Manufacturer Options: Equivalent specifications from alternative manufacturers (Nichicon, Cornell Dubilier Electronics, Rubycon).

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	Tolerance	Lifetime @ 105°C	Height (mm)	Ripple Current @ 120 Hz	Ripple Current @ 10/20/50 kHz
LAK2G331MELB50	Nichicon	330 µF	400 V	±20%	2000 Hrs	52.00	1.21 A	1.392 A @ 10 kHz
LGN2G331MELB35	Nichicon	330 µF	400 V	±20%	3000 Hrs	37.00	1.44 A	2.0592 A @ 50 kHz
LGW2G331MELB40	Nichicon	330 µF	400 V	±20%	3000 Hrs	40.00	2.33 A	3.3319 A @ 50 kHz
LGR2G331MELB50	Nichicon	330 µF	400 V	±20%	10000 Hrs	52.00	1.2 A	1.716 A @ 50 kHz
381LQ331M400K032	Cornell Dubilier Electronics	330 µF	400 V	±20%	2000 Hrs	37.00	1.44 A	2.02 A @ 20 kHz
381LR331M400K042	Cornell Dubilier Electronics	330 µF	400 V	±20%	3000 Hrs	42.00	1.71 A	2.44 A @ 20 kHz
381LX331M400K452	Cornell Dubilier Electronics	330 µF	400 V	±20%	3000 Hrs	47.00	1.4 A	1.9 A @ 20 kHz
400MXH330MEFCSN30X30	Rubycon	330 µF	400 V	±20%	2000 Hrs	32.00	1.55 A	2.17 A @ 10 kHz
381LR331M450K052	Cornell Dubilier Electronics	330 µF	450 V	±20%	3000 Hrs	52.00	1.85 A	2.64 A @ 20 kHz
381LX331M450K052	Cornell Dubilier Electronics	330 µF	450 V	±20%	3000 Hrs	52.00	1.4 A	1.9 A @ 20 kHz
500MXH330MEFCSN30X50	Rubycon	330 µF	500 V	±20%	2000 Hrs	52.00	1.81 A	2.534 A @ 10 kHz

Engineering Selection Recommendations

Direct Substitutes (400 V, 330 µF):

LGN2G331MELB35, LGW2G331MELB40, and 381LQ331M400K032 are direct electrical equivalents with identical capacitance, voltage, and tolerance specifications. These parts differ in height and lifetime rating. LGN2G331MELB35 and LGW2G331MELB40 offer extended 3000-hour lifetimes compared to the 2000-hour rating of LAK2G331MELB50. Height variations (37.00 mm, 40.00 mm, 32.00 mm) must be verified against PCB layout constraints before selection.

Enhanced Lifetime Option:

LGR2G331MELB50 maintains identical electrical specifications and height (52.00 mm) as LAK2G331MELB50 while providing a 10000-hour lifetime at 105°C. This part is suitable for applications requiring extended service life without PCB redesign.

Cross-Manufacturer Equivalents:

381LR331M400K042 and 381LX331M400K452 (Cornell Dubilier Electronics) and 400MXH330MEFCSN30X30 (Rubycon) meet all electrical and mechanical requirements. Height variations must be evaluated for PCB compatibility. All substitute parts maintain ROHS3 compliance and are rated for -25°C to 105°C operation.

Upgraded Voltage Rating Options:

381LR331M450K052 and 381LX331M450K052 provide 450 V rating with 330 µF capacitance. 500MXH330MEFCSN30X50 provides 500 V rating. These upgrades are suitable for applications requiring higher voltage margins while maintaining the same capacitance value and 52.00 mm height. Voltage upgrades do not require circuit redesign but provide additional safety margin in high-voltage applications.

Frequently Asked Questions (FAQ)

Q: Can I substitute LAK2G331MELB50 with a part having a different height?

A: Height differences must be verified against PCB layout. LGN2G331MELB35 (37.00 mm), LGW2G331MELB40 (40.00 mm), and 400MXH330MEFCSN30X30 (32.00 mm) are shorter than the original 52.00 mm height. Verify clearance above and below the capacitor location before substitution. Parts with identical 52.00 mm height (LGR2G331MELB50, 381LR331M450K052, 381LX331M450K052, 500MXH330MEFCSN30X50) require no layout verification.

Q: What is the difference between direct equivalents and upgraded alternatives?

A: Direct equivalents maintain the same voltage rating (400 V) and lifetime (2000 or 3000 hours). Upgraded alternatives either extend lifetime to 10000 hours (LGR2G331MELB50) or increase voltage rating to 450 V or 500 V (381LR331M450K052, 381LX331M450K052, 500MXH330MEFCSN30X50). Electrical performance in the circuit remains identical; upgrades provide enhanced reliability or safety margins.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and suitable for applications requiring RoHS certification.

Q: Can I use a 450 V or 500 V rated capacitor in place of the 400 V LAK2G331MELB50?

A: Yes. Higher voltage-rated capacitors (381LR331M450K052, 381LX331M450K052, 500MXH330MEFCSN30X50) are electrically compatible and provide additional voltage margin. No circuit modification is required. Verify physical height compatibility with PCB layout.

Q: What is the significance of ripple current ratings?

A: Ripple current capacity indicates the maximum AC current the capacitor can handle at specified frequencies (120 Hz, 10 kHz, 20 kHz, 50 kHz). Substitute parts with higher ripple current ratings support applications with greater AC stress. Verify that the selected substitute meets or exceeds the ripple current requirements of your application.

Q: Do all substitutes have the same lead spacing?

A: Yes. All listed substitute parts maintain 10.00 mm lead spacing and 30.00 mm diameter, ensuring compatibility with existing PCB footprints designed for LAK2G331MELB50.

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