LKX2W121MESA30 Equivalent & Substitute Parts

Part Overview

The LKX2W121MESA30 is a 120 µF, 450 V aluminum electrolytic capacitor in radial, can snap-in package manufactured by Nichicon. This component is rated for 2000 hours at 105°C and is designed for audio applications. The part is currently active in production. Equivalent and substitute parts may be required due to inventory constraints, application-specific performance needs, or design optimization for extended operational lifetime.

Key Parameters

Parameter	Value
Capacitance	120 µF
Voltage Rating	450 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)
Case Diameter	0.984" (25.00 mm)
Height	1.260" (32.00 mm)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the LKX2W121MESA30 is determined by strict equivalence across the following parameters: capacitance (120 µF), voltage rating (450 V), tolerance (±20%), package type (radial, can snap-in), lead spacing (10.00 mm), and mounting type (through hole). All substitute parts must maintain identical electrical ratings and physical footprint compatibility.

The three qualified substitute parts are:

LAS2W121MELA30 (Nichicon) – Equivalent electrical and mechanical specifications with identical lifetime rating (2000 Hrs @ 105°C). Differs in application classification (general purpose vs. audio) and ripple current performance at specific frequencies.

LGX2W121MELA30 (Nichicon) – Equivalent electrical and mechanical specifications with extended lifetime (5000 Hrs @ 105°C). Differs in application classification and ripple current performance characteristics.

B43254B5127M000 (EPCOS - TDK Electronics) – Equivalent electrical specifications with intermediate lifetime rating (3000 Hrs @ 105°C). Minor dimensional variation in case diameter (25.40 mm vs. 25.00 mm). Product status is "Not For New Designs." Differs in ripple current performance and MSL rating.

Parameter Comparison

Parameter	LKX2W121MESA30	LAS2W121MELA30	LGX2W121MELA30	B43254B5127M000
Manufacturer	Nichicon	Nichicon	Nichicon	EPCOS - TDK Electronics
Capacitance	120 µF	120 µF	120 µF	120 µF
Voltage Rating	450 V	450 V	450 V	450 V
Tolerance	±20%	±20%	±20%	±20%
Lifetime @ 105°C	2000 Hrs	2000 Hrs	5000 Hrs	3000 Hrs
Operating Temperature	-25°C ~ 105°C	-25°C ~ 105°C	-25°C ~ 105°C	-25°C ~ 105°C
Package Type	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In
Lead Spacing	0.394" (10.00 mm)	0.394" (10.00 mm)	0.394" (10.00 mm)	0.394" (10.00 mm)
Case Diameter	0.984" (25.00 mm)	0.984" (25.00 mm)	0.984" (25.00 mm)	1.000" (25.40 mm)
Height	1.260" (32.00 mm)	1.260" (32.00 mm)	1.260" (32.00 mm)	1.260" (32.00 mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Active	Active	Active	Not For New Designs
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Ripple Current @ 120 Hz	720 mA	760 mA	880 mA	500 mA
Ripple Current @ High Frequency	1.0296 A @ 50 kHz	874 mA @ 10 kHz	1.2584 A @ 50 kHz	775 mA @ 20 kHz

Engineering Selection Recommendations

LAS2W121MELA30 – Direct electrical equivalent with identical lifetime rating. Suitable for applications where the original LKX2W121MESA30 specification is met and inventory availability is a consideration. Both parts are active products with ROHS3 compliance.

LGX2W121MELA30 – Recommended for applications requiring extended operational lifetime. The 5000-hour rating at 105°C provides 2.5× longer service life than the original part. Identical electrical specifications and physical footprint. Active product status with ROHS3 compliance supports new design implementation.

B43254B5127M000 – Not recommended for new designs due to "Not For New Designs" product status. The 0.40 mm case diameter increase may present mechanical fit concerns in space-constrained applications. Acceptable only as a temporary substitute in legacy system maintenance where inventory of active alternatives is unavailable.

Frequently Asked Questions (FAQ)

Q: Can LAS2W121MELA30 be used as a direct replacement for LKX2W121MESA30?

A: Yes. Both parts share identical electrical ratings (120 µF, 450 V, ±20%), lifetime (2000 Hrs @ 105°C), and physical dimensions. The primary difference is application classification; however, this does not affect electrical compatibility or performance in the circuit.

Q: What is the advantage of LGX2W121MELA30 over the original part?

A: The LGX2W121MELA30 provides 5000-hour lifetime at 105°C compared to 2000 hours for the LKX2W121MESA30. All other electrical and mechanical parameters are identical. This extended lifetime is beneficial for applications requiring higher reliability or longer service intervals.

Q: Why is B43254B5127M000 marked "Not For New Designs"?

A: This designation indicates the part is in end-of-life status and should not be selected for new product development. It remains available for legacy system support and maintenance only.

Q: Will B43254B5127M000 fit in the same PCB footprint as LKX2W121MESA30?

A: The case diameter differs by 0.40 mm (25.40 mm vs. 25.00 mm). Lead spacing and height are identical. Verify mechanical clearance in the specific application before substitution, as the larger diameter may interfere with adjacent components or mounting hardware.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. LAS2W121MELA30, LGX2W121MELA30, and B43254B5127M000 are all ROHS3 compliant, matching the compliance status of the original LKX2W121MESA30.

Q: How do ripple current ratings affect part selection?

A: Ripple current capacity must meet or exceed the circuit's actual ripple current demand at the operating frequency. The LGX2W121MELA30 offers the highest ripple current performance at 50 kHz (1.2584 A), while B43254B5127M000 has the lowest capacity. Select based on your circuit's specific frequency and ripple current requirements.

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