Nichicon LGU2E331MELZ Equivalent & Substitute Parts

Part Overview

The Nichicon LGU2E331MELZ is a 330 µF, 250 V aluminum electrolytic capacitor in radial, can snap-in package designed for general purpose applications. This through-hole component operates across -40°C to 105°C with a rated lifetime of 3000 hours at 105°C. The part is active and ROHS3 compliant, making it suitable for industrial and commercial electronics requiring stable capacitance performance over extended operational periods.

Equivalent and substitute parts are identified based on matching core electrical specifications: capacitance value, voltage rating, tolerance, operating temperature range, lifetime rating, and physical form factor compatibility. Substitutes within this category maintain functional equivalence while accommodating variations in physical dimensions and ripple current handling capabilities.

Key Parameters

Parameter	Value
Capacitance	330 µF
Voltage Rating	250 V
Tolerance	±20%
Operating Temperature Range	-40°C ~ 105°C
Lifetime @ Temperature	3000 Hrs @ 105°C
Polarization	Polar
Package Type	Radial, Can - Snap-In
Mounting Type	Through Hole
Lead Spacing	0.394" (10.00mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following criteria:

Primary Matching Parameters (Non-Negotiable):

Capacitance: 330 µF
Voltage Rating: 250 V
Tolerance: ±20%
Operating Temperature: -40°C ~ 105°C
Package Type: Radial, Can - Snap-In
Mounting Type: Through Hole
Lead Spacing: 0.394" (10.00mm)

Secondary Variation Parameters (Allowed Within Substitution):

Physical dimensions (diameter and height) may vary provided the component fits the PCB footprint
Lifetime rating at 105°C (3000 hours minimum acceptable)
Ripple current specifications (low and high frequency)
Manufacturer series designation

Parts are grouped into two categories:

Direct Substitutes: Nichicon LGU and LGW series parts with identical or superior ripple current ratings and matching physical constraints.

Similar Substitutes: Parts from alternative manufacturers (Cornell Dubilier Electronics, EPCOS - TDK Electronics) or Nichicon variants with dimensional differences that require PCB layout verification.

Parameter Comparison

Part Number	Manufacturer	Series	Capacitance	Voltage	Tolerance	Lifetime @ 105°C	Diameter (mm)	Height (mm)	Ripple @ 120Hz (A)	Ripple @ 50kHz (A)	Status
LGU2E331MELZ	Nichicon	LGU	330 µF	250 V	±20%	3000 Hrs	22.00	40.00	1.3	1.95	Active
LGN2E331MELZ30	Nichicon	LGN	330 µF	250 V	±20%	3000 Hrs	22.00	32.00	1.2	1.8	Active
LGW2E331MELZ30	Nichicon	LGW	330 µF	250 V	±20%	3000 Hrs	22.00	30.00	1.8	2.7	Active
LGN2E331MELA25	Nichicon	LGN	330 µF	250 V	±20%	3000 Hrs	25.00	27.00	1.2	1.8	Active
LGN2E331MELY35	Nichicon	LGN	330 µF	250 V	±20%	3000 Hrs	20.00	37.00	1.2	1.8	Active
LGU2E331MELA	Nichicon	LGU	330 µF	250 V	±20%	3000 Hrs	25.00	30.00	1.3	1.95	Active
LGU2E331MELB	Nichicon	LGU	330 µF	250 V	±20%	3000 Hrs	30.00	25.00	1.3	1.95	Active
LGU2E331MELY	Nichicon	LGU	330 µF	250 V	±20%	3000 Hrs	20.00	40.00	1.2	1.8	Active
LGW2E331MELA25	Nichicon	LGW	330 µF	250 V	±20%	3000 Hrs	25.00	25.00	1.8	2.7	Active
381LQ331M250H022	Cornell Dubilier Electronics	381LQ	330 µF	250 V	±20%	2000 Hrs	22.00	32.00	1.2	1.68	Active
B43504C2337M000	EPCOS - TDK Electronics	B43504	330 µF	250 V	±20%	3000 Hrs	25.00	32.00	1.2	1.68	Not For New Designs

Engineering Selection Recommendations

Preferred Direct Substitutes (Nichicon Active Series):

LGW2E331MELZ30 and LGW2E331MELA25 are recommended as primary substitutes. Both are active Nichicon products with superior ripple current handling (1.8 A @ 120 Hz, 2.7 A @ 50 kHz) compared to the LGU2E331MELZ baseline. These parts maintain the 3000-hour lifetime rating at 105°C and ROHS3 compliance. Physical dimensions vary; verify PCB footprint compatibility before selection.

LGN2E331MELZ30 and LGN2E331MELA25 provide equivalent electrical performance with reduced physical height, suitable for space-constrained applications. Both maintain active product status and full compliance certifications.

LGU2E331MELA and LGU2E331MELB preserve the original LGU series ripple current specifications while offering alternative form factors. Both remain active products with identical lifetime and temperature ratings.

Alternative Manufacturer Options:

Cornell Dubilier Electronics 381LQ331M250H022 is functionally compatible with reduced lifetime rating (2000 hours vs. 3000 hours at 105°C). This part is active and ROHS3 compliant but exhibits lower ripple current capacity at high frequency (1.68 A @ 20 kHz). Selection requires application-specific thermal and ripple current analysis.

EPCOS - TDK Electronics B43504C2337M000 matches electrical specifications and lifetime rating but carries "Not For New Designs" status. This designation indicates the manufacturer is discontinuing the product line. Use only in legacy system maintenance or when supply chain constraints necessitate alternative sourcing. ROHS3 compliance is maintained.

Selection Criteria Summary:

For new designs: Select from active Nichicon LGU, LGN, or LGW series variants
For high ripple current applications: Prioritize LGW series (1.8 A @ 120 Hz minimum)
For space-constrained PCBs: LGN2E331MELZ30 or LGW2E331MELZ30 offer reduced height
For legacy system support: Cornell Dubilier 381LQ331M250H022 acceptable with thermal verification
Avoid EPCOS B43504C2337M000 for new designs due to discontinued status

Frequently Asked Questions (FAQ)

Q: Can I substitute LGU2E331MELZ with any part from the comparison table?

A: Direct substitution requires matching capacitance (330 µF), voltage rating (250 V), tolerance (±20%), operating temperature range (-40°C to 105°C), and package type (radial snap-in through-hole). All listed parts meet these criteria. However, verify PCB footprint compatibility, as physical dimensions vary. Ripple current specifications should meet or exceed application requirements.

Q: What is the difference between Nichicon LGU, LGN, and LGW series?

A: These are distinct product lines within Nichicon's aluminum electrolytic capacitor portfolio. The primary differences are physical dimensions and ripple current ratings. LGW series offers the highest ripple current capacity (1.8 A @ 120 Hz, 2.7 A @ 50 kHz), making it suitable for high-current applications. LGN series provides compact form factors with moderate ripple current (1.2 A @ 120 Hz, 1.8 A @ 50 kHz). LGU series balances performance and size. All three maintain identical electrical specifications for this 330 µF, 250 V rating.

Q: Why does the Cornell Dubilier part have a lower lifetime rating?

A: The 381LQ331M250H022 is rated for 2000 hours at 105°C, compared to 3000 hours for Nichicon equivalents. This reflects different design and manufacturing approaches between manufacturers. Applications requiring extended operational life at elevated temperatures should prioritize the 3000-hour rated parts. Thermal stress analysis may be necessary to determine if 2000-hour rating is acceptable for specific use cases.

Q: Should I use the EPCOS B43504C2337M000 part?

A: The EPCOS part carries "Not For New Designs" status, indicating manufacturer discontinuation. It remains functionally compatible and ROHS3 compliant but should be reserved for legacy system repairs or emergency supply situations. For new product development, select from active Nichicon variants to ensure long-term supply chain stability and manufacturer support.

Q: How do I determine which substitute fits my PCB layout?

A: Compare the diameter and height specifications of the candidate part against your PCB footprint. The LGU2E331MELZ reference part measures 22.00 mm diameter × 40.00 mm height. Substitutes range from 20.00 mm to 30.00 mm diameter and 25.00 mm to 40.00 mm height. Verify clearance for adjacent components and solder joint accessibility before finalizing part selection.

Q: What does "lead spacing 0.394" (10.00mm)" mean?

A: This specifies the distance between the two radial leads on the capacitor. All listed parts maintain 10.00 mm lead spacing, ensuring compatibility with standard PCB hole patterns designed for the LGU2E331MELZ. This parameter is non-negotiable for direct substitution.

Q: Are all listed parts ROHS3 compliant?

A: Yes. All parts in the comparison table carry ROHS3 compliance certification. This ensures compliance with European Union Restriction of Hazardous Substances regulations and is suitable for applications requiring environmental compliance documentation.

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