LGU2G121MELZ Equivalent & Substitute Parts

Part Overview

The LGU2G121MELZ is a 120 µF, 400 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 reliable energy storage and filtering in power supply circuits. The part is Active status and ROHS3 compliant. Equivalent and substitute parts may be required due to inventory constraints, design revisions, or application-specific performance requirements.

Substiute Parts

LGU2G121MELZ

NichiconIn Stock: 1105LGU2G121MELZ Datasheet

Current PartRFQ

LGW2W121MELZ35

NichiconIn Stock: 1119LGW2W121MELZ35 Datasheet

UpgradeRFQ

LGU2G121MELA

NichiconIn Stock: 9695LGU2G121MELA Datasheet

SimilarRFQ

400MXG120MEFCSN22X30

RubyconIn Stock: 866400MXG120MEFCSN22X30 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LGU2G121MELZ is determined by the following critical parameters:

Primary Substitution Criteria:

• Capacitance: 120 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Voltage Rating: 400 V minimum (equal or higher voltage acceptable)
• Package / Case: Radial, Can - Snap-In (mechanical compatibility)
• Mounting Type: Through Hole (PCB assembly compatibility)
• Lead Spacing: 0.394" (10.00 mm) (footprint requirement)
• Operating Temperature Range: -25°C ~ 105°C minimum (thermal compatibility)
• Polarization: Polar (electrical requirement)

Substitution Categories:

Upgrade Substitute: Higher voltage rating (450 V) with identical capacitance and mechanical dimensions, providing enhanced voltage margin while maintaining form factor compatibility.

Similar Substitute: Identical electrical specifications (120 µF, 400 V, ±20%) with different physical dimensions (larger diameter and shorter height), suitable where PCB space allocation differs.

Direct Substitute: Alternative manufacturer (Rubycon) with matching electrical and mechanical specifications, providing cross-manufacturer compatibility.

Parameter Comparison

Engineering Selection Recommendations

LGW2W121MELZ35 (Upgrade Substitute): Select this part when higher voltage margin is required. The 450 V rating provides 50 V additional headroom over the 400 V main part while maintaining identical mechanical form factor and lead spacing. Both parts are Nichicon products with Active status and ROHS3 compliance. This substitution is suitable for designs requiring enhanced voltage stress tolerance.

LGU2G121MELA (Similar Substitute): Select this part when PCB layout accommodates a larger diameter (0.984" vs 0.866") and shorter height (0.984" vs 1.378"). Electrical specifications are identical to the main part. This Nichicon LGU series component maintains Active status and ROHS3 compliance. Verify PCB footprint clearance before selection.

400MXG120MEFCSN22X30 (Direct Substitute): Select this Rubycon part for cross-manufacturer compatibility. Electrical and mechanical specifications match the main part with identical lead spacing and similar dimensions. Height is 1.260" (32.00 mm), intermediate between the main part and similar substitute. This part is Active status and ROHS3 compliant. Rubycon MXG series provides equivalent performance for general-purpose applications.

All substitute parts maintain the required 120 µF capacitance, ±20% tolerance, and through-hole snap-in package configuration. Selection should be based on PCB layout constraints, voltage margin requirements, and manufacturer preference.

Frequently Asked Questions (FAQ)

Q: Can LGW2W121MELZ35 be used as a direct replacement for LGU2G121MELZ?

A: Yes. The LGW2W121MELZ35 has identical mechanical dimensions (0.866" diameter, 1.378" height, 0.394" lead spacing) and capacitance (120 µF, ±20%). The 450 V rating is higher than the 400 V requirement, which is acceptable in circuit design. Both are Nichicon products with Active status and ROHS3 compliance.

Q: What is the difference between LGU2G121MELA and LGU2G121MELZ?

A: Both parts have identical electrical specifications (120 µF, 400 V, ±20%, 3000 Hrs @ 105°C). The primary difference is physical size: LGU2G121MELA has a larger diameter (0.984" vs 0.866") and shorter height (0.984" vs 1.378"). Lead spacing remains 0.394" (10.00 mm) for both. Selection depends on available PCB space.

Q: Is the Rubycon 400MXG120MEFCSN22X30 compatible with the Nichicon LGU2G121MELZ?

A: Yes. Both parts share identical capacitance (120 µF), tolerance (±20%), voltage rating (400 V), lead spacing (0.394"), and package type (radial, can-style snap-in through-hole). Height differs slightly (1.260" vs 1.378"), but both are within acceptable mechanical compatibility for standard PCB layouts. Both are Active status and ROHS3 compliant.

Q: Can I use a 450 V capacitor in a circuit designed for 400 V?

A: Yes. A higher voltage rating provides additional safety margin and does not degrade circuit performance. The LGW2W121MELZ35 (450 V) is suitable for any application requiring the LGU2G121MELZ (400 V).

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts (LGW2W121MELZ35, LGU2G121MELA, and 400MXG120MEFCSN22X30) are ROHS3 compliant and suitable for applications requiring RoHS certification.

Q: What is the lead spacing requirement for these capacitors?

A: All parts listed maintain 0.394" (10.00 mm) lead spacing, ensuring compatibility with standard PCB footprints designed for the LGU2G121MELZ.