LGU2W121MELZ Equivalent & Substitute Parts

Part Overview

The LGU2W121MELZ is a 120 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 active and in production, with ROHS3 compliance and REACH unaffected status. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity when the primary part becomes unavailable or when alternative performance characteristics are required.

Key Parameters

Parameter	Value
Capacitance	120 µF
Voltage - Rated	450 V
Tolerance	±20%
Lifetime @ Temperature	3000 Hrs @ 105°C
Operating Temperature Range	-25°C ~ 105°C
Polarization	Polar
Package / Case	Radial, Can - Snap-In
Mounting Type	Through Hole
Lead Spacing	0.394" (10.00 mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

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

Capacitance: 120 µF (exact match required)
Voltage Rating: 450 V (exact match required)
Tolerance: ±20% (exact match required)
Package / Case: Radial, Can - Snap-In (exact match required)
Mounting Type: Through Hole (exact match required)
Lead Spacing: 0.394" (10.00 mm) (exact match required)
Polarization: Polar (exact match required)
Operating Temperature Range: -25°C ~ 105°C (exact match required)
RoHS Status: ROHS3 Compliant (exact match required)

All substitute parts listed meet these mandatory criteria. Variations in lifetime rating, ripple current specifications, physical dimensions (diameter and height), and manufacturer series are permitted within the substitution group, as these do not affect electrical compatibility or mechanical fit in standard applications.

Parameter Comparison

Part Number	Manufacturer	Series	Capacitance	Voltage	Tolerance	Lifetime @ 105°C	Operating Temp	Lead Spacing	Size / Diameter	Height (Max)	Ripple Current @ 120 Hz	Ripple Current @ 50 kHz	RoHS Status
LGU2W121MELZ	Nichicon	LGU	120 µF	450 V	±20%	3000 Hrs	-25°C ~ 105°C	0.394" (10.00 mm)	0.866" (22.00 mm)	1.575" (40.00 mm)	800 mA	1.144 A	ROHS3
LGG2W121MELA25	Nichicon	LGG	120 µF	450 V	±20%	2000 Hrs	-25°C ~ 105°C	0.394" (10.00 mm)	0.984" (25.00 mm)	1.063" (27.00 mm)	690 mA	986.7 mA	ROHS3
LGG2W121MELZ30	Nichicon	LGG	120 µF	450 V	±20%	2000 Hrs	-25°C ~ 105°C	0.394" (10.00 mm)	0.866" (22.00 mm)	1.260" (32.00 mm)	690 mA	986.7 mA	ROHS3
LGU2W121MELB	Nichicon	LGU	120 µF	450 V	±20%	3000 Hrs	-25°C ~ 105°C	0.394" (10.00 mm)	1.181" (30.00 mm)	0.984" (25.00 mm)	800 mA	1.144 A	ROHS3
LGW2W121MELZ35	Nichicon	LGW	120 µF	450 V	±20%	3000 Hrs	-25°C ~ 105°C	0.394" (10.00 mm)	0.866" (22.00 mm)	1.378" (35.00 mm)	1.15 A	1.6445 A	ROHS3
450MXG120MEFCSN22X30	Rubycon	MXG	120 µF	450 V	±20%	3000 Hrs	-25°C ~ 105°C	0.394" (10.00 mm)	0.866" (22.00 mm)	1.260" (32.00 mm)	980 mA	1.372 A @ 10 kHz	ROHS3
450VXH120MEFCSN22X30	Rubycon	VXH	120 µF	450 V	±20%	5000 Hrs	-25°C ~ 105°C	0.394" (10.00 mm)	0.866" (22.00 mm)	1.260" (32.00 mm)	980 mA	1.372 A @ 10 kHz	ROHS3
EKMQ451VSN121MP35S	Chemi-Con	KMQ	120 µF	450 V	±20%	2000 Hrs	-25°C ~ 105°C	0.394" (10.00 mm)	0.866" (22.00 mm)	1.457" (37.00 mm)	720 mA	1.0296 A	ROHS3

Engineering Selection Recommendations

All substitute parts listed are active products with ROHS3 compliance and REACH unaffected status, matching the primary part LGU2W121MELZ. Selection among equivalent parts should be based on the following criteria:

Nichicon LGU Series (3000 Hrs @ 105°C): LGU2W121MELZ and LGU2W121MELB provide identical lifetime ratings and ripple current performance. LGU2W121MELB offers a larger diameter (1.181") with reduced height (0.984"), suitable for applications with space constraints in the vertical direction.

Nichicon LGW Series (3000 Hrs @ 105°C): LGW2W121MELZ35 delivers the highest ripple current capacity (1.15 A @ 120 Hz, 1.6445 A @ 50 kHz) among Nichicon options while maintaining 3000-hour lifetime. Height is 1.378" (35.00 mm).

Nichicon LGG Series (2000 Hrs @ 105°C): LGG2W121MELA25 and LGG2W121MELZ30 are suitable for applications where reduced lifetime is acceptable. LGG2W121MELZ30 matches the primary part's diameter (0.866") with a height of 1.260" (32.00 mm).

Rubycon MXG Series (3000 Hrs @ 105°C): 450MXG120MEFCSN22X30 provides 3000-hour lifetime with moderate ripple current (980 mA @ 120 Hz). MSL rating is 1 (Unlimited).

Rubycon VXH Series (5000 Hrs @ 105°C): 450VXH120MEFCSN22X30 offers extended lifetime (5000 hours) with identical physical dimensions and ripple current to the MXG series. MSL rating is 1 (Unlimited).

Chemi-Con KMQ Series (2000 Hrs @ 105°C): EKMQ451VSN121MP35S is suitable for cost-sensitive applications where 2000-hour lifetime is acceptable. Height is 1.457" (37.00 mm), the tallest option in the group.

Frequently Asked Questions (FAQ)

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

A: Yes. Lifetime rating (measured in hours at 105°C) is not a constraint for substitution. Parts with 2000-hour, 3000-hour, or 5000-hour ratings are electrically and mechanically compatible. Selection depends on application requirements and expected service life.

Q: Are there physical size differences I need to consider?

A: Yes. While all parts share the same lead spacing (10.00 mm) and diameter range (22.00 mm to 30.00 mm), heights vary from 0.984" to 1.575". Verify that the substitute part fits within your PCB layout constraints before selection.

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

A: Yes. Rubycon MXG and VXH series parts meet all electrical and mechanical compatibility requirements. Both manufacturers produce ROHS3-compliant components with identical capacitance, voltage, tolerance, and package specifications.

Q: What is the difference between the Rubycon MXG and VXH series?

A: Both series have identical electrical and physical specifications. The primary difference is lifetime: MXG is rated for 3000 hours at 105°C, while VXH is rated for 5000 hours at 105°C. Both have MSL rating of 1 (Unlimited).

Q: Which substitute offers the highest ripple current capacity?

A: LGW2W121MELZ35 (Nichicon LGW series) provides the highest ripple current: 1.15 A @ 120 Hz and 1.6445 A @ 50 kHz.

Q: Are all parts RoHS compliant?

A: Yes. All parts listed, including the primary part LGU2W121MELZ, are ROHS3 compliant and REACH unaffected.

Q: Can I use a part with lower ripple current rating?

A: Ripple current capacity is an application-specific parameter. If your circuit requires ripple current handling above the substitute part's rating, that part is not suitable. Verify ripple current requirements before selection.

Q: What does MSL rating mean for these capacitors?

A: Moisture Sensitivity Level (MSL) indicates the component's sensitivity to moisture during storage and handling. Nichicon parts are listed as "Not Applicable," while Rubycon parts are rated MSL 1 (Unlimited), meaning they have no moisture sensitivity restrictions.

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