LGU2D391MELZ Equivalent & Substitute Parts

Part Overview

The LGU2D391MELZ is a 390 µF, 200 V aluminum electrolytic capacitor manufactured by Nichicon in the LGU series. This radial, can-style snap-in capacitor is rated for 3000 hours at 105°C and operates across a temperature range of -40°C to 105°C. The part is Active status and ROHS3 compliant, making it suitable for general-purpose applications requiring stable capacitance and ripple current handling.

Equivalent and substitute parts are necessary when the primary part number becomes unavailable, when inventory constraints require alternative sourcing, or when design flexibility permits selection from qualified alternatives that meet the same electrical and mechanical specifications.

Key Parameters

Parameter	Value
Capacitance	390 µF
Voltage Rating	200 V
Tolerance	±20%
Lifetime @ Temperature	3000 Hrs @ 105°C
Operating Temperature Range	-40°C ~ 105°C
Polarization	Polar
Lead Spacing	0.394" (10.00 mm)
Package Type	Radial, Can - Snap-In
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the LGU2D391MELZ is determined by strict equivalence across the following parameters:

Capacitance: 390 µF (exact match required)
Voltage Rating: 200 V (exact match required)
Tolerance: ±20% (exact match required)
Lifetime: 3000 Hrs @ 105°C (exact match required)
Operating Temperature: -40°C ~ 105°C (exact match required)
Polarization: Polar (exact match required)
Lead Spacing: 0.394" (10.00 mm) (exact match required)
Package Type: Radial, Can - Snap-In (exact match required)
Mounting Type: Through Hole (exact match required)
RoHS Status: ROHS3 Compliant (exact match required)

All substitute parts listed below meet these criteria. Physical dimensions (diameter and height) may vary within the constraints of the snap-in package form factor, provided that the lead spacing and mounting type remain unchanged.

Parameter Comparison

Part Number	Manufacturer	Series	Capacitance	Voltage	Tolerance	Lifetime @ 105°C	Operating Temp	Lead Spacing	Size Dia	Height (Max)	Ripple Current @ 120 Hz	Ripple Current @ 50/20 kHz	RoHS Status	Inventory
LGU2D391MELZ	Nichicon	LGU	390 µF	200 V	±20%	3000 Hrs	-40°C ~ 105°C	0.394" (10.00 mm)	0.866" (22.00 mm)	1.181" (30.00 mm)	1.35 A	2.025 A @ 50 kHz	ROHS3	937 Pcs
LGN2D391MELZ25	Nichicon	LGN	390 µF	200 V	±20%	3000 Hrs	-40°C ~ 105°C	0.394" (10.00 mm)	0.866" (22.00 mm)	1.063" (27.00 mm)	1.31 A	1.965 A @ 50 kHz	ROHS3	3227 Pcs
LGN2D391MELY30	Nichicon	LGN	390 µF	200 V	±20%	3000 Hrs	-40°C ~ 105°C	0.394" (10.00 mm)	0.787" (20.00 mm)	1.260" (32.00 mm)	1.34 A	2.01 A @ 50 kHz	ROHS3	980 Pcs
LGU2D391MELY	Nichicon	LGU	390 µF	200 V	±20%	3000 Hrs	-40°C ~ 105°C	0.394" (10.00 mm)	0.787" (20.00 mm)	1.575" (40.00 mm)	1.31 A	1.965 A @ 50 kHz	ROHS3	742 Pcs
381LR391M200H022	Cornell Dubilier Electronics (CDE)	381LR	390 µF	200 V	±20%	3000 Hrs	-40°C ~ 105°C	0.394" (10.00 mm)	0.866" (22.00 mm)	1.260" (32.00 mm)	1.71 A	2.44 A @ 20 kHz	ROHS3	7657 Pcs
381LX391M200H022	Cornell Dubilier Electronics (CDE)	381LX	390 µF	200 V	±20%	3000 Hrs	-40°C ~ 105°C	0.394" (10.00 mm)	0.866" (22.00 mm)	1.260" (32.00 mm)	1.3 A	1.8 A @ 20 kHz	ROHS3	7773 Pcs

Engineering Selection Recommendations

All listed substitute parts are Active status and ROHS3 compliant, meeting the same regulatory and environmental requirements as the primary LGU2D391MELZ part number.

Selection among equivalent parts should be based on:

Physical space constraints within the application, as diameter and height vary across the substitute options
Ripple current requirements at the operating frequency of the circuit
Inventory availability and lead time considerations
Manufacturer preference or qualification requirements within the design documentation

The Nichicon LGU and LGN series parts maintain consistent electrical performance across all listed alternatives. Cornell Dubilier Electronics (CDE) 381LR and 381LX series parts provide equivalent functionality with higher ripple current ratings in certain frequency bands, offering additional design margin in applications with elevated ripple current demands.

Frequently Asked Questions (FAQ)

Q: Can I substitute LGN2D391MELZ25 for LGU2D391MELZ in my circuit?

A: Yes. Both parts meet identical electrical specifications: 390 µF capacitance, 200 V voltage rating, ±20% tolerance, 3000 hours lifetime at 105°C, and -40°C to 105°C operating temperature. The primary difference is physical height: LGN2D391MELZ25 is 1.063" (27.00 mm) versus LGU2D391MELZ at 1.181" (30.00 mm). Verify that your PCB layout accommodates the shorter height.

Q: What is the difference between Nichicon and Cornell Dubilier parts in this list?

A: Both manufacturers provide 390 µF, 200 V aluminum electrolytic capacitors with identical electrical ratings and snap-in package compatibility. The Cornell Dubilier 381LR series offers higher ripple current capability (1.71 A @ 120 Hz versus 1.35 A for the primary part). Selection depends on application requirements and manufacturer qualification.

Q: Are all these parts through-hole mounted?

A: Yes. All listed parts are through-hole mounted with 0.394" (10.00 mm) lead spacing, compatible with standard PCB hole patterns designed for the LGU2D391MELZ.

Q: Do physical dimension differences affect electrical performance?

A: No. Diameter and height variations among the substitute parts do not alter capacitance, voltage rating, tolerance, or lifetime specifications. Physical differences reflect design variations within the snap-in can package form factor. Selection should be based on available PCB space.

Q: Are all parts ROHS3 compliant?

A: Yes. All listed parts meet ROHS3 compliance requirements, ensuring compatibility with environmental and regulatory standards.

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