381LR331M420A032 Equivalent & Substitute Parts Reference

Part Overview

The 381LR331M420A032 is a 330 µF, 420 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in a radial, can snap-in package. This component is rated for general-purpose applications with a 3000-hour lifetime at 105°C and operates across the temperature range of -25°C to 105°C. The part maintains Active product status and is ROHS3 compliant.

Substitute parts are identified when equivalent capacitance, voltage rating, tolerance, package type, and mounting configuration align with the original specification. Alternative sources may be required due to inventory availability, extended lifetime ratings, or manufacturer preference in system design.

Key Parameters

Parameter	Value	Unit
Capacitance	330	µF
Voltage - Rated	420	V
Tolerance	±20%	-
ESR @ 120Hz	402	mOhm
Lifetime @ 105°C	3000	Hrs
Operating Temperature Range	-25 to 105	°C
Package Type	Radial, Can - Snap-In	-
Mounting Type	Through Hole	-
Lead Spacing	10.00	mm
Diameter	35.00	mm
Height - Seated (Max)	37.00	mm
Polarization	Polar	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Matching Parameters:

Capacitance: 330 µF (exact match required)
Tolerance: ±20% (exact match required)
Package Type: Radial, Can - Snap-In (exact match required)
Mounting Type: Through Hole (exact match required)
Lead Spacing: 10.00 mm (exact match required)
Diameter: 35.00 mm (exact match required)
Polarization: Polar (exact match required)

Secondary Matching Parameters:

Voltage Rating: 420 V or higher (equal or greater voltage rating acceptable)
Operating Temperature Range: -25°C to 105°C minimum (exact match or broader range acceptable)
RoHS Compliance: ROHS3 Compliant (maintained across all substitutes)

Flexible Parameters:

Height - Seated (Max): Variation permitted within mechanical envelope constraints
ESR: Variation permitted based on manufacturer specifications
Lifetime @ 105°C: Equal or extended lifetime acceptable
Ripple Current: Variation permitted based on application requirements

Substitutes are grouped into two categories: Similar Voltage Rating (420 V) and Upgraded Voltage Rating (450 V). Parts with upgraded voltage ratings provide enhanced electrical margin while maintaining all other critical parameters.

Parameter Comparison

Parameter	381LR331M420A032 (CDE)	LGUW6331MELC (Nichicon)	381LR331M450A042 (CDE)	LQS2W331MELC35 (Nichicon)	450VXG330MEFCSN35X35 (Rubycon)
Capacitance	330 µF	330 µF	330 µF	330 µF	330 µF
Voltage - Rated	420 V	420 V	450 V	450 V	450 V
Tolerance	±20%	±20%	±20%	±20%	±20%
ESR @ 120Hz	402 mOhm	Not Specified	402 mOhm	Not Specified	Not Specified
Lifetime @ 105°C	3000 Hrs	3000 Hrs	3000 Hrs	3000 Hrs	5000 Hrs
Operating Temperature	-25 to 105°C	-25 to 105°C	-25 to 105°C	-25 to 105°C	-25 to 105°C
Package Type	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Lead Spacing	10.00 mm	10.00 mm	10.00 mm	10.00 mm	10.00 mm
Diameter	35.00 mm	35.00 mm	35.00 mm	35.00 mm	35.00 mm
Height - Seated (Max)	37.00 mm	35.00 mm	42.00 mm	37.00 mm	37.00 mm
Polarization	Polar	Polar	Polar	Polar	Polar
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Manufacturer	Cornell Dubilier Electronics	Nichicon	Cornell Dubilier Electronics	Nichicon	Rubycon
Series	381LR	LGU	381LR	LQS	VXG
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Same Voltage Rating (420 V) Substitutes:

LGUW6331MELC (Nichicon LGU Series) is a direct equivalent to the 381LR331M420A032. Both parts maintain identical capacitance, voltage rating, tolerance, and lifetime specifications. The LGUW6331MELC features a reduced seated height of 35.00 mm compared to the original 37.00 mm, which may provide space advantage in compact designs. Both parts are ROHS3 compliant and Active product status. This substitute is suitable for applications where voltage margin is not a design constraint and space optimization is beneficial.

Upgraded Voltage Rating (450 V) Substitutes:

Three alternatives are available with 450 V voltage rating, providing 30 V additional electrical margin above the original 420 V specification:

381LR331M450A042 (Cornell Dubilier Electronics 381LR Series) maintains manufacturer continuity while upgrading voltage rating. This part shares the same ESR specification (402 mOhm @ 120Hz) and lifetime rating (3000 Hrs @ 105°C) as the original. Height increases to 42.00 mm, requiring verification of mechanical clearance in the application.

LQS2W331MELC35 (Nichicon LQS Series) provides 450 V rating with identical seated height (37.00 mm) to the original part. Lifetime rating remains 3000 Hrs @ 105°C. This part is ROHS3 compliant and Active status.

450VXG330MEFCSN35X35 (Rubycon VXG Series) offers the highest lifetime rating at 5000 Hrs @ 105°C, providing extended operational reliability. Voltage rating is 450 V with seated height of 37.00 mm. This part is ROHS3 compliant and Active status.

All substitute parts maintain Through Hole mounting, 10.00 mm lead spacing, 35.00 mm diameter, and polar configuration. Selection should be based on voltage margin requirements, mechanical envelope constraints, and desired operational lifetime.

Frequently Asked Questions (FAQ)

Q: Can the 381LR331M420A032 be replaced with a 450 V rated capacitor?

A: Yes. A 450 V rated capacitor with identical capacitance (330 µF), tolerance (±20%), package type (Radial, Can - Snap-In), and mounting configuration (Through Hole) is electrically compatible. The higher voltage rating provides additional electrical margin and does not degrade performance in applications designed for 420 V operation.

Q: What is the difference between the LGUW6331MELC and the 381LR331M420A032?

A: Both parts are 330 µF, 420 V aluminum electrolytic capacitors with ±20% tolerance, 3000-hour lifetime at 105°C, and identical lead spacing (10.00 mm) and diameter (35.00 mm). The primary difference is seated height: LGUW6331MELC measures 35.00 mm while 381LR331M420A032 measures 37.00 mm. The LGUW6331MELC is manufactured by Nichicon; the original is manufactured by Cornell Dubilier Electronics.

Q: Is the 450VXG330MEFCSN35X35 a direct replacement for the 381LR331M420A032?

A: The 450VXG330MEFCSN35X35 is mechanically and electrically compatible as a substitute. It maintains the same capacitance (330 µF), tolerance (±20%), package type, mounting configuration, lead spacing, diameter, and seated height (37.00 mm). The voltage rating is upgraded to 450 V, and the lifetime is extended to 5000 Hrs @ 105°C. The manufacturer is Rubycon instead of Cornell Dubilier Electronics.

Q: What does the height difference between substitute parts mean for my application?

A: Seated height variation ranges from 35.00 mm (LGUW6331MELC) to 42.00 mm (381LR331M450A042). Verify that the selected substitute fits within the mechanical envelope of your PCB layout and enclosure. Taller components may require clearance verification in confined spaces.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, matching the environmental and regulatory status of the original 381LR331M420A032.

Q: What is the significance of the 5000-hour lifetime rating on the 450VXG330MEFCSN35X35?

A: The 450VXG330MEFCSN35X35 is rated for 5000 hours at 105°C, compared to 3000 hours for the original part and most other substitutes. This extended lifetime provides longer operational reliability in applications subject to sustained elevated temperature conditions. The extended rating does not affect electrical performance or compatibility.

Q: Can I use the 381LR331M450A042 if my circuit board has limited vertical clearance?

A: The 381LR331M450A042 has a seated height of 42.00 mm, which is 5.00 mm taller than the original 381LR331M420A032 (37.00 mm). Verify that your mechanical envelope accommodates this additional height before selection. If vertical clearance is constrained, consider the LQS2W331MELC35 or 450VXG330MEFCSN35X35, both of which maintain the original 37.00 mm height.

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