Nichicon LGU2E391MELY 390µF 250V Aluminum Electrolytic Capacitor

Part Overview

The Nichicon LGU2E391MELY is a 390µF, 250V aluminum electrolytic capacitor in radial, can snap-in package configuration. This component is classified as Active product status and is designed for general-purpose applications requiring stable capacitance performance across extended operating temperature ranges. Equivalent and substitute parts are necessary when addressing supply chain constraints, design revisions, or specific mechanical and electrical requirements that may vary between manufacturing series within the same electrical specification class.

Key Parameters

Parameter	Value
Manufacturer Part Number	LGU2E391MELY
Manufacturer	Nichicon
Series	LGU
Capacitance	390 µF
Tolerance	±20%
Voltage - Rated	250 V
Lifetime @ Temperature	3000 Hrs @ 105°C
Operating Temperature Range	-40°C ~ 105°C
Polarization	Polar
Lead Spacing	0.394" (10.00mm)
Package / Case	Radial, Can - Snap-In
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the LGU2E391MELY is determined by strict equivalence across the following critical parameters:

Electrical Equivalence: Capacitance value (390 µF), tolerance (±20%), and rated voltage (250 V) must be identical
Thermal Performance: Lifetime specification (3000 Hrs @ 105°C) and operating temperature range (-40°C ~ 105°C) must match
Mechanical Compatibility: Lead spacing (10.00mm), mounting type (Through Hole), and package configuration (Radial, Can - Snap-In) must be maintained
Regulatory Compliance: RoHS3 compliance and REACH unaffected status must be preserved

The substitute parts identified—LGN2E391MELY40, LGU2E391MELA, and LGW2E391MELZ35—meet all electrical and thermal requirements. Variations exist only in physical dimensions (diameter and height) and ripple current ratings, which are secondary parameters that do not affect functional equivalence when the primary electrical and thermal specifications are satisfied.

Parameter Comparison

Parameter	LGU2E391MELY	LGN2E391MELY40	LGU2E391MELA	LGW2E391MELZ35
Capacitance	390 µF	390 µF	390 µF	390 µF
Tolerance	±20%	±20%	±20%	±20%
Voltage - Rated	250 V	250 V	250 V	250 V
Lifetime @ Temperature	3000 Hrs @ 105°C	3000 Hrs @ 105°C	3000 Hrs @ 105°C	3000 Hrs @ 105°C
Operating Temperature Range	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C
Lead Spacing	10.00mm	10.00mm	10.00mm	10.00mm
Size / Dimension (Diameter)	20.00mm	20.00mm	25.00mm	22.00mm
Height - Seated (Max)	50.00mm	42.00mm	35.00mm	35.00mm
Ripple Current @ 120 Hz	1.45 A	1.3 A	1.49 A	1.95 A
Ripple Current @ 50 kHz	2.175 A	1.95 A	2.235 A	2.925 A
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

All substitute parts—LGN2E391MELY40, LGU2E391MELA, and LGW2E391MELZ35—maintain full electrical and thermal equivalence to the primary part LGU2E391MELY. Selection among these alternatives is determined by physical space constraints and ripple current requirements within the application circuit.

LGN2E391MELY40 provides the most compact height (42.00mm) while maintaining the original diameter (20.00mm), suitable for space-constrained applications with moderate ripple current demands.

LGU2E391MELA offers increased diameter (25.00mm) with reduced height (35.00mm), providing higher ripple current capacity (2.235 A @ 50 kHz) for applications requiring enhanced thermal dissipation.

LGW2E391MELZ35 delivers the highest ripple current rating (2.925 A @ 50 kHz) with intermediate diameter (22.00mm) and minimum height (35.00mm), optimized for high-frequency switching applications.

All parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment across all substitution scenarios.

Frequently Asked Questions (FAQ)

Q: Can LGN2E391MELY40 be used as a direct replacement for LGU2E391MELY?

A: Yes. Both parts share identical electrical specifications (390µF, 250V, ±20% tolerance, 3000 Hrs @ 105°C). The primary difference is height reduction from 50.00mm to 42.00mm. Verify available PCB mounting space before substitution.

Q: What is the difference between LGU2E391MELA and LGW2E391MELZ35?

A: Both parts have identical electrical ratings and reduced height (35.00mm). LGW2E391MELZ35 provides superior ripple current handling (2.925 A @ 50 kHz versus 2.235 A @ 50 kHz) due to larger diameter (22.00mm versus 25.00mm). Select based on circuit ripple current requirements and available PCB footprint.

Q: Are all substitute parts through-hole mounted with 10.00mm lead spacing?

A: Yes. All substitute parts maintain through-hole mounting configuration with 10.00mm lead spacing, ensuring compatibility with existing PCB designs without layout modifications.

Q: Do substitute parts meet the same compliance standards as the primary part?

A: Yes. All substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory status of LGU2E391MELY.

Q: Which substitute part should be selected for high-ripple-current applications?

A: LGW2E391MELZ35 is specified for maximum ripple current performance (2.925 A @ 50 kHz), making it the appropriate selection for high-frequency switching circuits or applications with elevated thermal stress.

Q: Can physical dimensions be modified during substitution?

A: No. While substitute parts have different dimensions, each must be verified for fit within the specific PCB mounting area. Dimension changes do not affect electrical performance but require mechanical validation before implementation.

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