LKX2G331MESC30 Equivalent & Substitute Parts

Part Overview

The LKX2G331MESC30 is a 330 µF, 400 V aluminum electrolytic capacitor manufactured by Nichicon in the LKX series. This radial, can-style snap-in capacitor is designed for audio applications with a rated lifetime of 2000 hours at 105°C. The part is currently active and in stock with 92,700 units available.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when design requirements demand extended lifetime or higher voltage ratings, or when alternative manufacturers must be qualified for supply chain resilience.

Key Parameters

Parameter	Value
Capacitance	330 µF
Voltage Rating	400 V
Tolerance	±20%
Lifetime @ 105°C	2000 Hrs
Operating Temperature Range	-25°C to 105°C
Lead Spacing	0.394" (10.00 mm)
Case Diameter	1.378" (35.00 mm)
Height (Seated Max)	1.260" (32.00 mm)
Mounting Type	Through Hole
Package Type	Radial, Can - Snap-In
Polarization	Polar
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the LKX2G331MESC30 is determined by the following criteria:

Primary Substitution Parameters:

Capacitance: 330 µF (exact match required)
Tolerance: ±20% (exact match required)
Voltage Rating: 400 V minimum (equal or higher acceptable)
Lead Spacing: 0.394" (10.00 mm) (exact match required)
Case Diameter: 1.378" (35.00 mm) (exact match required)
Height: 1.260" (32.00 mm) (exact match required)
Package Type: Radial, Can - Snap-In (exact match required)
Mounting Type: Through Hole (exact match required)
Operating Temperature: -25°C to 105°C minimum (equal or wider range acceptable)

Secondary Considerations:

Lifetime at 105°C: 2000 hours minimum (equal or longer acceptable)
Ripple current capability: Must meet or exceed application requirements
RoHS and REACH compliance status

Parts are classified as Upgrade when they offer improved specifications (higher voltage rating, extended lifetime, or lower ESR) while maintaining full mechanical and electrical compatibility. Parts are classified as Similar when they share identical electrical specifications but differ in physical dimensions. Parts are classified as Direct when they provide equivalent functionality from alternative manufacturers.

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	Tolerance	Lifetime @ 105°C	Case Dia	Height	Lead Spacing	Ripple Current @ 120 Hz	Status
LKX2G331MESC30	Nichicon	330 µF	400 V	±20%	2000 Hrs	1.378" (35 mm)	1.260" (32 mm)	0.394" (10 mm)	1.44 A	Active
LGG2W331MELC30	Nichicon	330 µF	450 V	±20%	2000 Hrs	1.378" (35 mm)	1.260" (32 mm)	0.394" (10 mm)	1.2 A	Active
LQSW6331MELC30	Nichicon	330 µF	420 V	±20%	3000 Hrs	1.378" (35 mm)	1.260" (32 mm)	0.394" (10 mm)	1.42 A	Active
LKX2G331MESA50	Nichicon	330 µF	400 V	±20%	2000 Hrs	0.984" (25 mm)	2.047" (52 mm)	0.394" (10 mm)	1.44 A	Active
381LQ331M400A022	Cornell Dubilier Electronics	330 µF	400 V	±20%	2000 Hrs	1.378" (35 mm)	1.260" (32 mm)	0.394" (10 mm)	1.44 A	Active
381LR331M400A022	Cornell Dubilier Electronics	330 µF	400 V	±20%	3000 Hrs	1.378" (35 mm)	1.260" (32 mm)	0.394" (10 mm)	1.71 A	Active
450MXH330MEFCSN35X30	Rubycon	330 µF	450 V	±20%	2000 Hrs	1.378" (35 mm)	1.260" (32 mm)	0.394" (10 mm)	1.54 A	Active
B43254C9337M000	EPCOS - TDK Electronics	330 µF	400 V	±20%	3000 Hrs	1.378" (35 mm)	1.260" (32 mm)	0.394" (10 mm)	1.33 A	Not For New Designs
B43640C5337M000	EPCOS - TDK Electronics	330 µF	450 V	±20%	2000 Hrs	1.378" (35 mm)	1.260" (32 mm)	0.394" (10 mm)	1.43 A	Active
EKMQ421VSN331MA30S	Chemi-Con	330 µF	420 V	±20%	2000 Hrs	1.378" (35 mm)	1.260" (32 mm)	0.394" (10 mm)	1.42 A	Active

Engineering Selection Recommendations

Direct Substitutes (Identical Specifications, Same Manufacturer): The LKX2G331MESC30 has no direct equivalent within the Nichicon LKX series with identical specifications.

Upgrade Substitutes (Enhanced Performance, Same Footprint):

LGG2W331MELC30 (Nichicon): Provides 450 V rating versus 400 V, maintaining identical physical dimensions and lead spacing. Suitable for applications requiring higher voltage margin. Active product status.

LQSW6331MELC30 (Nichicon): Offers extended lifetime of 3000 hours at 105°C versus 2000 hours, with 420 V rating. Maintains identical footprint. Active product status.

381LR331M400A022 (Cornell Dubilier Electronics): Provides 3000-hour lifetime at 105°C with improved ripple current capability (1.71 A @ 120 Hz). Maintains 400 V rating and identical physical dimensions. Active product status.

450MXH330MEFCSN35X30 (Rubycon): Offers 450 V rating with identical footprint and lead spacing. Active product status.

B43640C5337M000 (EPCOS - TDK Electronics): Provides 450 V rating with identical physical dimensions. Active product status.

EKMQ421VSN331MA30S (Chemi-Con): Offers 420 V rating with identical footprint. Active product status.

Alternative Substitutes (Different Physical Dimensions):

LKX2G331MESA50 (Nichicon): Maintains identical electrical specifications (330 µF, 400 V, 2000 Hrs @ 105°C) but differs in physical dimensions (0.984" diameter, 2.047" height versus 1.378" diameter, 1.260" height). Suitable only if PCB layout permits the larger footprint. Active product status.

Not Recommended for New Designs:

B43254C9337M000 (EPCOS - TDK Electronics): Product status is "Not For New Designs." Although it offers 3000-hour lifetime and identical footprint, this part should not be selected for new circuit designs.

Direct Equivalent from Alternative Manufacturer:

381LQ331M400A022 (Cornell Dubilier Electronics): Provides identical electrical and physical specifications (330 µF, 400 V, 2000 Hrs @ 105°C, same footprint). Suitable as a direct replacement from an alternative qualified manufacturer. Active product status.

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status consistent with the primary part.

Frequently Asked Questions (FAQ)

Q: Can LGG2W331MELC30 be used as a direct replacement for LKX2G331MESC30?

A: Yes. LGG2W331MELC30 is mechanically and electrically compatible. It maintains identical physical dimensions (1.378" diameter, 1.260" height, 0.394" lead spacing) and capacitance (330 µF ±20%). The 450 V rating exceeds the 400 V requirement, providing additional voltage margin. Both are Nichicon products with active status and ROHS3 compliance.

Q: What is the difference between an upgrade substitute and a direct substitute?

A: A direct substitute provides identical electrical and physical specifications. An upgrade substitute improves one or more performance parameters (such as voltage rating, lifetime, or ripple current capability) while maintaining full mechanical compatibility and the same footprint.

Q: Can LKX2G331MESA50 replace LKX2G331MESC30?

A: LKX2G331MESA50 is electrically equivalent but physically incompatible. It has a smaller diameter (0.984" versus 1.378") and greater height (2.047" versus 1.260"). This part can only be used if the PCB layout and mechanical constraints permit the different form factor. Both parts are from Nichicon's LKX series with identical electrical ratings.

Q: Why is B43254C9337M000 marked "Not For New Designs"?

A: B43254C9337M000 carries a "Not For New Designs" product status from EPCOS - TDK Electronics. This designation indicates the manufacturer is phasing out this part. Although it offers improved 3000-hour lifetime and identical footprint, new circuit designs should select from active product alternatives such as LQSW6331MELC30 or 381LR331M400A022.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, consistent with the primary LKX2G331MESC30 part.

Q: What is the significance of ripple current ratings in substitution?

A: Ripple current rating indicates the maximum AC current the capacitor can handle at a specified frequency without exceeding temperature limits. When selecting a substitute, the ripple current capability must meet or exceed the application's actual ripple current demand. For example, 381LR331M400A022 provides 1.71 A @ 120 Hz, exceeding the primary part's 1.44 A @ 120 Hz, offering improved margin for high-ripple applications.

Q: Can parts with different voltage ratings be interchanged?

A: Parts with higher voltage ratings can replace lower-rated parts in the same application, provided all other parameters (capacitance, tolerance, physical dimensions, lead spacing) remain identical. For example, LGG2W331MELC30 (450 V) can replace LKX2G331MESC30 (400 V). However, lower-rated parts cannot replace higher-rated parts.

Q: What does "lead spacing" mean and why is it critical for substitution?

A: Lead spacing is the distance between the two connection pins (0.394" or 10.00 mm for this part family). This dimension is critical because it determines whether the capacitor will physically fit into the PCB holes. All recommended substitutes maintain identical lead spacing to ensure PCB compatibility without requiring layout modifications.

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