LGN2G121MELY35 Equivalent & Substitute Parts

Part Overview

The LGN2G121MELY35 is a 120 µF, 400 V aluminum electrolytic capacitor in radial, can snap-in package manufactured by Nichicon. This component is designed for general-purpose applications requiring stable capacitance performance across an operating temperature range of -25°C to 105°C with a rated lifetime of 3000 hours at 105°C. The part is Active status and RoHS3 compliant, making it suitable for modern electronic equipment requiring environmental compliance.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when design requirements demand higher voltage ratings, or when alternative manufacturers' components offer improved availability or performance characteristics while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Capacitance	120 µF
Tolerance	±20%
Voltage - Rated	400 V
Lifetime @ Temperature	3000 Hrs @ 105°C
Operating Temperature Range	-25°C ~ 105°C
Polarization	Polar
Lead Spacing	0.394" (10.00 mm)
Size / Dimension	0.787" Dia (20.00 mm)
Height - Seated (Max)	1.457" (37.00 mm)
Mounting Type	Through Hole
Package / Case	Radial, Can - Snap-In
RoHS Status	RoHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the LGN2G121MELY35 is determined by the following critical parameters:

Mandatory Matching Parameters:

Capacitance: 120 µF (exact match required)
Tolerance: ±20% (exact match required)
Voltage Rating: 400 V minimum (equal or higher acceptable)
Polarization: Polar (exact match required)
Lead Spacing: 0.394" (10.00 mm) (exact match required)
Mounting Type: Through Hole (exact match required)
Package / Case: Radial, Can - Snap-In (exact match required)

Allowable Variation Parameters:

Physical dimensions (diameter and height) may vary within mechanical envelope constraints
Ripple current ratings may differ based on manufacturer design
Lifetime specifications at rated temperature must meet or exceed 3000 hours @ 105°C

Substitute parts are grouped into three categories: Similar Manufacturer Parts (same manufacturer, same electrical specifications, minor dimensional variations), Upgrade Parts (higher voltage rating with identical physical footprint), and Parametric Equivalents (different manufacturer, identical electrical and mechanical specifications).

Parameter Comparison

Parameter	LGN2G121MELY35 (Nichicon)	LGU2G121MELA (Nichicon)	LGU2G121MELZ (Nichicon)	450MXG120MEFCSN20X35 (Rubycon)	400MXG120MEFCSN20X35 (Rubycon)
Capacitance	120 µF	120 µF	120 µF	120 µF	120 µF
Tolerance	±20%	±20%	±20%	±20%	±20%
Voltage - Rated	400 V	400 V	400 V	450 V	400 V
Lifetime @ Temp.	3000 Hrs @ 105°C	3000 Hrs @ 105°C	3000 Hrs @ 105°C	3000 Hrs @ 105°C	3000 Hrs @ 105°C
Operating Temperature	-25°C ~ 105°C	-25°C ~ 105°C	-25°C ~ 105°C	-25°C ~ 105°C	-25°C ~ 105°C
Lead Spacing	0.394" (10.00 mm)	0.394" (10.00 mm)	0.394" (10.00 mm)	0.394" (10.00 mm)	0.394" (10.00 mm)
Size / Dimension	0.787" Dia (20.00 mm)	0.984" Dia (25.00 mm)	0.866" Dia (22.00 mm)	0.787" Dia (20.00 mm)	0.787" Dia (20.00 mm)
Height - Seated (Max)	1.457" (37.00 mm)	0.984" (25.00 mm)	1.378" (35.00 mm)	1.457" (37.00 mm)	1.457" (37.00 mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In
RoHS Status	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant
Ripple Current @ 120 Hz	730 mA	750 mA	750 mA	990 mA	990 mA
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

LGU2G121MELA (Nichicon): Direct electrical equivalent with identical voltage and capacitance ratings. Physical dimensions differ (0.984" diameter, 0.984" height), requiring verification of available board space. RoHS3 compliant and Active status. Select when Nichicon series preference is required and dimensional constraints permit the larger can diameter.

LGU2G121MELZ (Nichicon): Direct electrical equivalent with identical voltage and capacitance ratings. Physical dimensions (0.866" diameter, 1.378" height) fall between the main part and LGU2G121MELA. RoHS3 compliant and Active status. Select when intermediate physical dimensions are compatible with board layout.

450MXG120MEFCSN20X35 (Rubycon): Upgrade substitute with 450 V rating (50 V higher than main part) while maintaining identical physical footprint (0.787" diameter, 1.457" height). Identical lead spacing and mounting type. RoHS3 compliant and Active status. Select when higher voltage margin is required or when Rubycon component availability is preferred. Moisture Sensitivity Level is 1 (Unlimited).

400MXG120MEFCSN20X35 (Rubycon): Parametric equivalent with identical electrical specifications and physical dimensions to the main part. RoHS3 compliant and Active status. Select as direct replacement when Rubycon sourcing is required or when primary part availability is constrained. Moisture Sensitivity Level is 1 (Unlimited).

Frequently Asked Questions (FAQ)

Q: Can LGU2G121MELA be used as a direct replacement for LGN2G121MELY35?

A: Electrically, yes. Both parts share identical capacitance (120 µF), tolerance (±20%), voltage rating (400 V), and operating temperature range. However, LGU2G121MELA has a larger physical diameter (0.984" vs. 0.787") and shorter height (0.984" vs. 1.457"). Board layout verification is required to confirm the larger diameter fits within available space.

Q: What is the advantage of using 450MXG120MEFCSN20X35 over the main part?

A: The 450MXG120MEFCSN20X35 provides a 50 V higher voltage rating (450 V vs. 400 V) while maintaining identical physical dimensions and lead spacing. This offers increased voltage margin for applications subject to transient overvoltage conditions. The physical footprint is identical, requiring no board layout changes.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts—LGU2G121MELA, LGU2G121MELZ, 450MXG120MEFCSN20X35, and 400MXG120MEFCSN20X35—are RoHS3 compliant, matching the compliance status of the main part LGN2G121MELY35.

Q: What is the difference between Nichicon and Rubycon substitutes?

A: Nichicon substitutes (LGU series) are from the same manufacturer as the main part, offering series continuity. Rubycon substitutes (MXG series) are from a different manufacturer but provide identical or superior electrical specifications. Selection depends on manufacturer preference, availability, and supply chain requirements.

Q: Can LGU2G121MELZ be used in space-constrained applications?

A: LGU2G121MELZ has intermediate physical dimensions (0.866" diameter, 1.378" height) compared to the main part (0.787" diameter, 1.457" height). It offers a smaller diameter but slightly reduced height. Board layout verification is required to confirm compatibility with specific space constraints.

Q: Do all substitute parts have the same ripple current rating?

A: No. Ripple current ratings vary by manufacturer design. The main part LGN2G121MELY35 has 730 mA @ 120 Hz, while Nichicon LGU series parts have 750 mA @ 120 Hz, and Rubycon MXG series parts have 990 mA @ 120 Hz. Higher ripple current capability may benefit applications with significant AC current stress.

Q: What is Moisture Sensitivity Level (MSL) and why does it differ?

A: MSL indicates the component's sensitivity to moisture during storage and handling. The main part and Nichicon substitutes show "Not Applicable," while Rubycon MXG parts show "1 (Unlimited)," indicating no moisture sensitivity restrictions. Both classifications are acceptable for general-purpose applications.

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