LGUW6121MELY Equivalent & Substitute Parts

Part Overview

The LGUW6121MELY is a 120 µF, 420 V aluminum electrolytic capacitor manufactured by Nichicon in the LGU series. This radial, can-style snap-in capacitor is designed for general purpose applications with a rated lifetime of 3000 hours at 105°C. The part is currently active in production status with ROHS3 compliance and REACH unaffected certification. Substitute parts are identified to provide design flexibility when the primary part is unavailable or when alternative mechanical configurations better suit specific board layout requirements.

Key Parameters

Parameter	Value
Capacitance	120 µF
Voltage Rating	420 V
Tolerance	±20%
Lifetime @ Temperature	3000 Hrs @ 105°C
Operating Temperature Range	-25°C ~ 105°C
Polarization	Polar
Package Type	Radial, Can - Snap-In
Mounting Type	Through Hole
Lead Spacing	0.394" (10.00 mm)

Substitute Part Grouping Explanation

Substitution eligibility for the LGUW6121MELY is determined by the following core electrical and mechanical parameters:

Electrical Parameters (Must Match):

Capacitance: 120 µF
Voltage Rating: 420 V
Tolerance: ±20%
Lifetime: 3000 Hrs @ 105°C
Operating Temperature: -25°C ~ 105°C
Polarization: Polar

Mechanical Parameters (Must Match):

Package Type: Radial, Can - Snap-In
Mounting Type: Through Hole
Lead Spacing: 0.394" (10.00 mm)

Allowable Variations:

Can diameter and height may vary within the snap-in package family
Ripple current ratings may differ based on can size

The identified substitute parts LGUW6121MELA and LGNW6121MELA25 meet all core electrical requirements and maintain the same lead spacing and mounting configuration, with variations only in physical dimensions and ripple current performance.

Parameter Comparison

Parameter	LGUW6121MELY	LGUW6121MELA	LGNW6121MELA25
Manufacturer	Nichicon	Nichicon	Nichicon
Series	LGU	LGU	LGN
Capacitance	120 µF	120 µF	120 µF
Voltage Rating	420 V	420 V	420 V
Tolerance	±20%	±20%	±20%
Lifetime @ 105°C	3000 Hrs	3000 Hrs	3000 Hrs
Operating Temperature	-25°C ~ 105°C	-25°C ~ 105°C	-25°C ~ 105°C
Polarization	Polar	Polar	Polar
Package Type	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In
Mounting Type	Through Hole	Through Hole	Through Hole
Lead Spacing	0.394" (10.00 mm)	0.394" (10.00 mm)	0.394" (10.00 mm)
Can Diameter	0.787" (20.00 mm)	0.984" (25.00 mm)	0.984" (25.00 mm)
Height (Seated Max)	1.575" (40.00 mm)	1.181" (30.00 mm)	1.063" (27.00 mm)
Ripple Current @ 120 Hz	750 mA	750 mA	810 mA
Ripple Current @ 50 kHz	1.0725 A	1.0725 A	1.1583 A
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

All three parts—LGUW6121MELY, LGUW6121MELA, and LGNW6121MELA25—are active production components with identical ROHS3 compliance and REACH unaffected certification status. Selection between these parts is based on physical space constraints and ripple current requirements within the application.

LGUW6121MELY is the primary reference part with a 20.00 mm diameter can and 40.00 mm seated height. This configuration is suitable for applications with adequate vertical clearance.

LGUW6121MELA maintains the same electrical and ripple current performance as the primary part while offering a larger 25.00 mm diameter can with reduced height of 30.00 mm. This part accommodates applications requiring lower profile designs.

LGNW6121MELA25 provides the most compact profile at 27.00 mm height with a 25.00 mm diameter can. This part also delivers higher ripple current performance at both 120 Hz (810 mA) and 50 kHz (1.1583 A), making it suitable for applications with elevated ripple current demands.

Frequently Asked Questions (FAQ)

Q: Can LGUW6121MELA be used as a direct replacement for LGUW6121MELY?

A: Yes. Both parts share identical electrical specifications, capacitance, voltage rating, tolerance, lifetime rating, and operating temperature range. The primary difference is physical dimensions: LGUW6121MELA has a larger diameter (25.00 mm vs. 20.00 mm) and shorter height (30.00 mm vs. 40.00 mm). Verify that your PCB layout accommodates the larger diameter before substitution.

Q: What is the difference between LGUW6121MELA and LGNW6121MELA25?

A: Both parts have identical electrical ratings and similar physical dimensions (25.00 mm diameter). The key difference is ripple current performance: LGNW6121MELA25 delivers higher ripple current at both 120 Hz (810 mA vs. 750 mA) and 50 kHz (1.1583 A vs. 1.0725 A). Additionally, LGNW6121MELA25 belongs to the LGN series while LGUW6121MELA belongs to the LGU series. Select LGNW6121MELA25 if your application requires higher ripple current handling.

Q: Are all three parts RoHS and REACH compliant?

A: Yes. LGUW6121MELY, LGUW6121MELA, and LGNW6121MELA25 are all ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the lead spacing for all substitute parts?

A: All three parts maintain a lead spacing of 0.394" (10.00 mm), ensuring compatibility with standard PCB footprints designed for this spacing.

Q: Can I use LGNW6121MELA25 in a space-constrained application?

A: LGNW6121MELA25 offers the lowest profile at 27.00 mm seated height, making it the most suitable choice for applications with vertical space limitations. Verify that the 25.00 mm can diameter fits within your available horizontal space.

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