LLS2W391MELB Equivalent & Substitute Parts

Part Overview

The Nichicon LLS2W391MELB is a 390 µF, 450 V aluminum electrolytic capacitor with radial, snap-in mounting. This component 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 to support procurement flexibility, inventory management, and design continuity when the primary part becomes unavailable.

Key Parameters

Parameter	Value
Capacitance	390 µF
Voltage - Rated	450 V
Tolerance	±20%
Polarization	Polar
Mounting Type	Through Hole
Package / Case	Radial, Can - Snap-In
Lead Spacing	0.394" (10.00mm)
Operating Temperature	-25°C ~ 85°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the LLS2W391MELB is determined by the following mandatory parameters:

Capacitance: 390 µF (exact match required)
Voltage - Rated: 450 V (exact match required)
Tolerance: ±20% (exact match required)
Polarization: Polar (exact match required)
Mounting Type: Through Hole (exact match required)
Package / Case: Radial, Can - Snap-In (exact match required)
Lead Spacing: 0.394" (10.00mm) (exact match required)
Operating Temperature: -25°C ~ 85°C (exact match required)

All identified substitute parts meet these core electrical and mechanical parameters. Variations in physical dimensions (diameter and height), ripple current ratings, ESR specifications, and lifetime ratings are permitted within the scope of substitution, provided the core parameters remain unchanged.

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	Tolerance	Lead Spacing	Size / Dimension	Height - Seated (Max)	Lifetime @ Temp.	Ripple Current @ 120 Hz	Ripple Current @ High Frequency	RoHS Status	Product Status
LLS2W391MELB	Nichicon	390 µF	450 V	±20%	0.394" (10.00mm)	1.181" Dia (30.00mm)	1.772" (45.00mm)	3000 Hrs @ 85°C	2.35 A @ 120 Hz	3.3605 A @ 50 kHz	ROHS3 Compliant	Active
LLS2W391MELC	Nichicon	390 µF	450 V	±20%	0.394" (10.00mm)	1.378" Dia (35.00mm)	1.575" (40.00mm)	3000 Hrs @ 85°C	2.38 A @ 120 Hz	3.4034 A @ 50 kHz	ROHS3 Compliant	Active
380LQ391M450A032	Cornell Dubilier Electronics (CDE)	390 µF	450 V	±20%	0.394" (10.00mm)	1.378" Dia (35.00mm)	1.457" (37.00mm)	2000 Hrs @ 85°C	2.24 A @ 120 Hz	3.14 A @ 20 kHz	ROHS3 Compliant	Active
380LQ391M450K042	Cornell Dubilier Electronics (CDE)	390 µF	450 V	±20%	0.394" (10.00mm)	1.181" Dia (30.00mm)	1.654" (42.00mm)	2000 Hrs @ 85°C	2.24 A @ 120 Hz	3.14 A @ 20 kHz	ROHS3 Compliant	Active
380LX391M450A452	Cornell Dubilier Electronics (CDE)	390 µF	450 V	±20%	0.394" (10.00mm)	1.378" Dia (35.00mm)	1.850" (47.00mm)	3000 Hrs @ 85°C	2.2 A @ 120 Hz	3.1 A @ 20 kHz	ROHS3 Compliant	Active
ESMQ451VSN391MR40S	Chemi-Con	390 µF	450 V	±20%	0.394" (10.00mm)	1.181" Dia (30.00mm)	1.575" (40.00mm)	2000 Hrs @ 85°C	2.24 A @ 120 Hz	3.203 A @ 50 kHz	RoHS Compliant	Active

Engineering Selection Recommendations

All identified substitute parts are Active status and meet RoHS compliance requirements. Selection between the LLS2W391MELB and substitute parts should be based on the following factors:

Nichicon LLS2W391MELB and LLS2W391MELC: Both are Nichicon products with 3000-hour lifetime ratings at 85°C, providing extended operational life. The LLS2W391MELC offers higher ripple current capacity with a larger diameter can.
Cornell Dubilier Electronics 380LQ391M450A032 and 380LQ391M450K042: Both feature 2000-hour lifetime ratings and lower ripple current specifications. The 380LQ391M450A032 has a shorter seated height (37.00mm), while the 380LQ391M450K042 maintains the original 30.00mm diameter.
Cornell Dubilier Electronics 380LX391M450A452: Offers 3000-hour lifetime rating with a larger diameter can (35.00mm) and maximum seated height (47.00mm).
Chemi-Con ESMQ451VSN391MR40S: Provides 2000-hour lifetime rating with compact dimensions matching the original 30.00mm diameter and 40.00mm seated height.

Frequently Asked Questions (FAQ)

Q: Can I substitute the LLS2W391MELB with any of these parts directly?

A: Yes. All listed parts meet the core electrical and mechanical parameters: 390 µF capacitance, 450 V rated voltage, ±20% tolerance, polar polarization, through-hole mounting, radial snap-in package, 10.00mm lead spacing, and -25°C to 85°C operating temperature range. Physical dimensions and performance characteristics vary; verify PCB layout compatibility before installation.

Q: What is the difference between the Nichicon LLS2W391MELB and LLS2W391MELC?

A: Both are Nichicon products with identical electrical specifications and 3000-hour lifetime ratings. The LLS2W391MELC has a larger diameter (35.00mm vs. 30.00mm) and shorter seated height (40.00mm vs. 45.00mm), with slightly higher ripple current capacity.

Q: Why do some substitutes have 2000-hour lifetimes instead of 3000 hours?

A: Lifetime ratings reflect the manufacturer's design specifications for the specific product series. The 2000-hour rated parts (Cornell Dubilier 380LQ series and Chemi-Con ESMQ series) are electrically equivalent but have different thermal endurance characteristics. Application requirements determine whether the reduced lifetime is acceptable.

Q: Are there physical dimension constraints I should consider?

A: Yes. The substitute parts vary in diameter (30.00mm or 35.00mm) and seated height (37.00mm to 47.00mm). Verify that your PCB layout and enclosure accommodate the selected substitute before procurement. The lead spacing remains constant at 10.00mm across all parts.

Q: Do all substitutes meet RoHS compliance?

A: All parts are RoHS compliant. The Nichicon and Cornell Dubilier parts are ROHS3 compliant. The Chemi-Con ESMQ451VSN391MR40S is RoHS compliant. Both certifications satisfy standard industrial requirements.

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