LKX2G331MESB40 Equivalent & Substitute Parts

Part Overview

The LKX2G331MESB40 is a 330 µF, 400 V aluminum electrolytic capacitor manufactured by Nichicon in the LKX series. This radial, snap-in can capacitor is designed for audio applications with a rated lifetime of 2000 hours at 105°C. The part is Active status and ROHS3 compliant. Equivalent and substitute parts are identified when design requirements allow for higher voltage ratings, extended operational lifetimes, or alternative manufacturer sourcing while maintaining core electrical and mechanical compatibility.

Key Parameters

Parameter	Value
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 (Max)	1.654" (42.00 mm)
Mounting Type	Through Hole
Polarization	Polar

Substitute Part Grouping Explanation

Substitution of the LKX2G331MESB40 is determined by the following criteria:

Direct Equivalents maintain identical capacitance (330 µF), voltage rating (400 V), tolerance (±20%), package type (Radial, Can - Snap-In), lead spacing (10.00 mm), and mounting configuration (Through Hole). These parts are interchangeable without circuit modification.

Voltage-Upgraded Substitutes increase the rated voltage from 400 V to 450 V while maintaining all other electrical and mechanical parameters. These substitutes are suitable when circuit design permits higher voltage-rated components and when extended operational lifetime or improved performance characteristics are required.

Dimensional Variants maintain the same capacitance, voltage, and tolerance but differ in physical dimensions (diameter or height). These require mechanical verification for PCB layout compatibility.

Manufacturer Alternatives provide equivalent electrical performance from different manufacturers (Rubycon, EPCOS - TDK Electronics, Cornell Dubilier Electronics, Chemi-Con) while maintaining the same electrical specifications and package footprint.

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	Tolerance	Lifetime @ 105°C	Diameter	Height	Substitution Type
LKX2G331MESB40	Nichicon	330 µF	400 V	±20%	2000 Hrs	1.181" (30.00 mm)	1.654" (42.00 mm)	Main Part
LKX2G331MESA50	Nichicon	330 µF	400 V	±20%	2000 Hrs	0.984" (25.00 mm)	2.047" (52.00 mm)	Dimensional Variant
381LR331M400K042	Cornell Dubilier Electronics (CDE)	330 µF	400 V	±20%	3000 Hrs	1.181" (30.00 mm)	1.654" (42.00 mm)	Direct Equivalent
LGN2W331MELB40	Nichicon	330 µF	450 V	±20%	3000 Hrs	1.181" (30.00 mm)	1.654" (42.00 mm)	Voltage-Upgraded
LQS2W331MELB40	Nichicon	330 µF	450 V	±20%	3000 Hrs	1.181" (30.00 mm)	1.654" (42.00 mm)	Voltage-Upgraded
450VXH330MEFCSN30X40	Rubycon	330 µF	450 V	±20%	5000 Hrs	1.181" (30.00 mm)	1.654" (42.00 mm)	Voltage-Upgraded
B43508B5337M000	EPCOS - TDK Electronics	330 µF	450 V	±20%	3000 Hrs	1.181" (30.00 mm)	1.654" (42.00 mm)	Voltage-Upgraded
B43644A5337M000	EPCOS - TDK Electronics	330 µF	450 V	±20%	5000 Hrs	1.181" (30.00 mm)	1.654" (42.00 mm)	Voltage-Upgraded
ELXS451VSN331MR40S	Chemi-Con	330 µF	450 V	±20%	5000 Hrs	1.181" (30.00 mm)	1.654" (42.00 mm)	Voltage-Upgraded

Engineering Selection Recommendations

For Direct Replacement (Same Voltage, Same Footprint): The 381LR331M400K042 from Cornell Dubilier Electronics provides a direct mechanical and electrical substitute with identical 400 V rating and 10.00 mm lead spacing. This part offers extended lifetime (3000 hours at 105°C versus 2000 hours) and is ROHS3 compliant with Active product status.

For Voltage-Upgraded Applications (450 V Rating): When circuit design permits operation at 450 V rated voltage, the following parts provide enhanced performance:

LGN2W331MELB40 and LQS2W331MELB40 (Nichicon) maintain the same manufacturer source with 3000-hour lifetime ratings
450VXH330MEFCSN30X40 (Rubycon) and B43644A5337M000 (EPCOS - TDK Electronics) offer extended 5000-hour lifetime ratings
ELXS451VSN331MR40S (Chemi-Con) provides 5000-hour lifetime with identical footprint

All voltage-upgraded substitutes maintain the same physical dimensions (1.181" diameter, 1.654" height, 10.00 mm lead spacing) and are ROHS3 compliant with Active product status.

For Dimensional Variants: The LKX2G331MESA50 maintains Nichicon sourcing and 400 V rating but features reduced diameter (0.984" versus 1.181") and increased height (2.047" versus 1.654"). This variant requires mechanical verification for PCB layout compatibility.

Frequently Asked Questions (FAQ)

Q: Can I use a 450 V rated capacitor in place of the 400 V LKX2G331MESB40? A: Yes. A higher voltage rating provides additional safety margin in the circuit. All 450 V substitutes listed maintain identical capacitance (330 µF), tolerance (±20%), package type (Radial, Can - Snap-In), lead spacing (10.00 mm), and physical dimensions (1.181" diameter, 1.654" height). Verify circuit design permits the substitution.

Q: What is the difference between direct equivalents and voltage-upgraded substitutes? A: Direct equivalents maintain the same 400 V voltage rating as the original part. Voltage-upgraded substitutes increase the rating to 450 V, which is suitable when circuit design allows higher voltage operation. Both types maintain identical capacitance, tolerance, and mechanical footprint.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All substitute parts listed are ROHS3 compliant and carry Active product status, meeting current regulatory requirements.

Q: Does the LKX2G331MESA50 have the same footprint as the LKX2G331MESB40? A: No. The LKX2G331MESA50 has a smaller diameter (0.984" versus 1.181") but greater height (2.047" versus 1.654"). Lead spacing remains identical at 10.00 mm. PCB layout must be verified for mechanical compatibility.

Q: What is the significance of lifetime ratings (2000 Hrs vs. 3000 Hrs vs. 5000 Hrs)? A: Lifetime rating indicates the expected operational duration at maximum rated temperature (105°C). Extended lifetime ratings provide longer service life under continuous operation at elevated temperatures. Selection depends on application requirements and expected operational conditions.

Q: Can I substitute parts from different manufacturers? A: Yes. All substitute parts maintain identical electrical specifications (330 µF, ±20% tolerance, same voltage rating) and mechanical compatibility (lead spacing, package type, mounting configuration). Manufacturer substitution is valid when electrical and mechanical parameters match.

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