LGU2W121MELY Equivalent & Substitute Parts

Part Overview

The LGU2W121MELY 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 status and ROHS3 compliant.

Equivalent and substitute parts are identified when design requirements allow flexibility in physical dimensions, ripple current handling, or manufacturer selection while maintaining core electrical specifications: 120 µF capacitance, 450 V rated voltage, ±20% tolerance, and through-hole radial snap-in mounting.

Substiute Parts

LGU2W121MELY

NichiconIn Stock: 1206LGU2W121MELY Datasheet

Current PartRFQ

LGG2W121MELA25

NichiconIn Stock: 847LGG2W121MELA25 Datasheet

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LGG2W121MELZ30

NichiconIn Stock: 1326LGG2W121MELZ30 Datasheet

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LGU2W121MELB

NichiconIn Stock: 999LGU2W121MELB Datasheet

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LGW2W121MELZ35

NichiconIn Stock: 1119LGW2W121MELZ35 Datasheet

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450MXG120MEFCSN20X35

RubyconIn Stock: 969450MXG120MEFCSN20X35 Datasheet

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EKMQ451VSN121MP35S

Chemi-ConIn Stock: 775EKMQ451VSN121MP35S Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Mandatory Electrical Parameters (No Deviation Allowed):

• Capacitance: 120 µF
• Voltage - Rated: 450 V
• Tolerance: ±20%
• Polarization: Polar
• Operating Temperature Range: -25°C ~ 105°C

Mandatory Mechanical Parameters (No Deviation Allowed):

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

Flexible Parameters (Substitution Allowed):

• Physical Dimensions (Diameter and Height): Variations permitted if PCB layout accommodates
• Lifetime @ Temperature: 2000 Hrs or 3000 Hrs @ 105°C both acceptable
• Ripple Current Ratings: Variations permitted if application requirements are met
• Manufacturer: Nichicon, Rubycon, or Chemi-Con

All substitute parts listed meet the mandatory electrical and mechanical criteria. Differences in physical size, ripple current capacity, and thermal lifetime are documented to enable informed selection based on specific application constraints.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts are Active status and ROHS3 compliant, meeting regulatory requirements equivalent to the LGU2W121MELY.

For applications requiring maximum thermal lifetime: Select LGU2W121MELY, LGU2W121MELB, LGW2W121MELZ35, or 450MXG120MEFCSN20X35 (all rated 3000 Hrs @ 105°C). The LGG and EKMQ series parts are rated 2000 Hrs @ 105°C and are suitable only where extended thermal endurance is not a design requirement.

For applications with space constraints: LGU2W121MELY (20mm diameter, 50mm height) and 450MXG120MEFCSN20X35 (20mm diameter, 37mm height) offer the smallest diameters. LGW2W121MELZ35 (22mm diameter, 35mm height) provides a compact alternative with higher ripple current capacity.

For applications requiring higher ripple current handling: LGW2W121MELZ35 (1.15 A @ 120 Hz, 1.6445 A @ 50 kHz) and 450MXG120MEFCSN20X35 (990 mA @ 120 Hz, 1.386 A @ 10 kHz) exceed the ripple current ratings of the main part and LGG series alternatives.

For manufacturer preference: Nichicon LGU, LGG, and LGW series; Rubycon MXG series; Chemi-Con KMQ series are all qualified substitutes with equivalent compliance status.

Frequently Asked Questions (FAQ)

Q: Can I substitute LGG2W121MELA25 for LGU2W121MELY? A: Yes, electrically and mechanically. The LGG2W121MELA25 meets all mandatory parameters: 120 µF, 450 V, ±20% tolerance, through-hole radial snap-in with 10mm lead spacing. The differences are physical size (25mm diameter vs. 20mm) and thermal lifetime (2000 Hrs vs. 3000 Hrs @ 105°C). Verify PCB layout accommodates the larger diameter and confirm application does not require 3000-hour thermal rating.

Q: What is the difference between LGU2W121MELY and LGU2W121MELB? A: Both are Nichicon LGU series with identical electrical specifications and 3000-hour thermal lifetime. Physical dimensions differ: LGU2W121MELY is 20mm diameter × 50mm height; LGU2W121MELB is 30mm diameter × 25mm height. Ripple current capacity is slightly higher in LGU2W121MELB (800 mA @ 120 Hz vs. 750 mA). Select based on available PCB space.

Q: Can I use EKMQ451VSN121MP35S as a direct replacement? A: Yes, for electrical and mechanical compatibility. EKMQ451VSN121MP35S is a Chemi-Con KMQ series part meeting all mandatory parameters. The thermal lifetime is 2000 Hrs @ 105°C (vs. 3000 Hrs for LGU2W121MELY). Physical dimensions are 22mm diameter × 37mm height. Confirm application thermal requirements before selection.

Q: Why does 450MXG120MEFCSN20X35 have different ripple current specifications? A: The 450MXG120MEFCSN20X35 ripple current is specified at 10 kHz rather than 50 kHz. This is a manufacturer-specific measurement convention. The part meets all mandatory electrical and mechanical criteria and is suitable for general-purpose 450 V, 120 µF applications.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed parts, including the main part LGU2W121MELY, are ROHS3 compliant and REACH unaffected, meeting equivalent regulatory requirements.

Q: What does lead spacing 0.394" (10.00mm) mean? A: Lead spacing is the distance between the two radial leads on the capacitor. All listed parts have identical 10mm lead spacing, ensuring PCB footprint compatibility at the lead level. Physical can diameter and height vary and must be verified against PCB layout constraints.