Equivalent & Substitute Parts for 381LQ331M400J452

Part Overview

The Cornell Dubilier Electronics 381LQ331M400J452 is a 330 µF, 400 V aluminum electrolytic capacitor in radial, can snap-in configuration. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design support and procurement continuity. The part operates across a temperature range of -25°C to 105°C with a rated lifetime of 2000 hours at 105°C, serving general-purpose applications requiring high-voltage energy storage and filtering.

Key Parameters

Parameter	Value
Capacitance	330 µF
Voltage Rating	400 V
Tolerance	±20%
ESR @ 120 Hz	553 mOhm
Lifetime @ 105°C	2000 Hrs
Operating Temperature Range	-25°C to 105°C
Ripple Current @ 120 Hz	1.44 A
Ripple Current @ 20 kHz	2.02 A
Lead Spacing	0.394" (10.00 mm)
Case Diameter	0.984" (25.00 mm)
Height (Seated Max)	1.850" (47.00 mm)
Mounting Type	Through Hole
Package Type	Radial, Can - Snap-In
Polarization	Polar
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 381LQ331M400J452 is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

Capacitance: 330 µF (exact match required)
Voltage Rating: 400 V (exact match required)
Tolerance: ±20% (exact match required)
Package Type: Radial, Can - Snap-In (exact match required)
Lead Spacing: 0.394" (10.00 mm) (exact match required)
Mounting Type: Through Hole (exact match required)
Polarization: Polar (exact match required)

Secondary Compatibility Parameters:

Operating Temperature Range: -25°C to 105°C (minimum requirement)
ESR @ 120 Hz: 553 mOhm or lower (performance enhancement acceptable)
Lifetime @ 105°C: 2000 Hrs minimum (extended lifetime acceptable)
Ripple Current Ratings: Must meet or exceed specified values

Substitute parts are grouped into two categories: Cornell Dubilier Electronics internal series variants (381LQ, 381LR, 381LX, SLP series) and direct cross-manufacturer alternatives (Rubycon MXG, MXK, VXH series). All listed substitutes maintain identical electrical specifications for capacitance, voltage, and tolerance while offering variations in physical dimensions, ESR characteristics, and thermal lifetime ratings.

Parameter Comparison

Part Number	Manufacturer	Series	Capacitance	Voltage	Tolerance	ESR @ 120 Hz	Lifetime @ 105°C	Case Dia (mm)	Height (mm)	Status
381LQ331M400J452	CDE	381LQ	330 µF	400 V	±20%	553 mOhm	2000 Hrs	25.00	47.00	Obsolete
381LQ331M400A022	CDE	381LQ	330 µF	400 V	±20%	553 mOhm	2000 Hrs	35.00	32.00	Active
381LQ331M400K032	CDE	381LQ	330 µF	400 V	±20%	553 mOhm	2000 Hrs	30.00	37.00	Active
381LR331M400A022	CDE	381LR	330 µF	400 V	±20%	402 mOhm	3000 Hrs	35.00	32.00	Active
381LR331M400K042	CDE	381LR	330 µF	400 V	±20%	402 mOhm	3000 Hrs	30.00	42.00	Active
381LX331M400A032	CDE	381LX	330 µF	400 V	±20%	Not Specified	3000 Hrs	35.00	37.00	Active
381LX331M400K452	CDE	381LX	330 µF	400 V	±20%	Not Specified	3000 Hrs	30.00	47.00	Active
SLP331M400E5P3	CDE	SLP0712TE	330 µF	400 V	±20%	1.005 Ohm	3000 Hrs	30.00	35.00	Active
400MXG330MEFCSN25X45	Rubycon	MXG	330 µF	400 V	±20%	Not Specified	3000 Hrs	25.00	47.00	Active
400MXK330MEFC25X35	Rubycon	MXK	330 µF	400 V	±20%	Not Specified	3000 Hrs	25.00	37.00	Active
400VXH330MEFC25X40	Rubycon	VXH	330 µF	400 V	±20%	Not Specified	5000 Hrs	25.00	42.00	Active

Engineering Selection Recommendations

Cornell Dubilier Electronics 381LQ Series (Same ESR, Same Lifetime):

The 381LQ331M400A022 and 381LQ331M400K032 maintain identical electrical performance to the obsolete 381LQ331M400J452, with ESR of 553 mOhm and 2000-hour lifetime at 105°C. Both parts are active and ROHS3 compliant. Selection between these variants depends on available board space: the A022 variant features a larger diameter (35.00 mm) with reduced height (32.00 mm), while the K032 variant offers a mid-range profile (30.00 mm diameter, 37.00 mm height). These are direct functional replacements requiring no circuit redesign.

Cornell Dubilier Electronics 381LR Series (Improved ESR, Extended Lifetime):

The 381LR331M400A022 and 381LR331M400K042 provide enhanced performance with reduced ESR (402 mOhm) and extended thermal lifetime (3000 hours at 105°C). These parts are active and ROHS3 compliant. The lower ESR reduces heat generation and improves ripple current handling. The A022 variant matches the footprint of 381LQ331M400A022, while K042 offers a taller profile (42.00 mm height) with 30.00 mm diameter. These substitutes are suitable for applications requiring improved thermal stability and reduced power dissipation.

Cornell Dubilier Electronics 381LX Series (Extended Lifetime):

The 381LX331M400A032 and 381LX331M400K452 extend thermal lifetime to 3000 hours at 105°C. ESR data is not specified for these variants. The K452 variant matches the original part's height (47.00 mm) with a smaller diameter (30.00 mm), providing a direct dimensional alternative. These parts are active and ROHS3 compliant.

Cornell Dubilier Electronics SLP Series (High-Performance Alternative):

The SLP331M400E5P3 offers significantly reduced ESR (1.005 Ohm) and 3000-hour lifetime. This part is active and ROHS3 compliant. The compact footprint (30.00 mm diameter, 35.00 mm height) suits space-constrained applications. The substantially lower ESR indicates superior high-frequency performance and reduced thermal generation.

Rubycon MXG Series (Direct Dimensional Match):

The 400MXG330MEFCSN25X45 matches the original part's case diameter (25.00 mm) and height (47.00 mm) exactly, providing a direct mechanical replacement. This part is active, ROHS3 compliant, and offers 3000-hour lifetime. Rubycon MXG series components are widely used in industrial power applications.

Rubycon MXK Series (Compact Alternative):

The 400MXK330MEFC25X35 maintains the 25.00 mm diameter with reduced height (37.00 mm). This part is active and ROHS3 compliant with 3000-hour lifetime. MSL rating is not applicable for this variant.

Rubycon VXH Series (Extended Thermal Lifetime):

The 400VXH330MEFC25X40 provides the longest thermal lifetime (5000 hours at 105°C) among all listed substitutes. This part maintains the 25.00 mm diameter with 42.00 mm height, is active and ROHS3 compliant. The extended lifetime is suitable for applications requiring maximum reliability over extended operational periods.

All listed substitutes maintain ROHS3 compliance and are suitable for general-purpose applications. Selection should prioritize active parts over obsolete variants and consider thermal lifetime requirements, available board space, and ESR performance characteristics specific to the application circuit.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 381LQ331M400J452 with any of the listed substitutes?

A: Direct replacement is possible only with parts maintaining identical electrical specifications (330 µF, 400 V, ±20% tolerance) and identical package configuration (radial, can snap-in, 10.00 mm lead spacing, through-hole mounting). The 381LQ331M400A022 and 381LQ331M400K032 provide direct electrical equivalence. Physical dimensions vary across substitutes; verify board layout compatibility before selection.

Q: What is the difference between 381LQ, 381LR, and 381LX series?

A: The primary differences are ESR and thermal lifetime. The 381LQ series maintains 553 mOhm ESR with 2000-hour lifetime. The 381LR series reduces ESR to 402 mOhm and extends lifetime to 3000 hours. The 381LX series extends lifetime to 3000 hours with unspecified ESR. All three series maintain identical capacitance, voltage, and tolerance specifications.

Q: Why does the SLP331M400E5P3 have significantly higher ESR than other substitutes?

A: The SLP331M400E5P3 specifies ESR as 1.005 Ohm, which is substantially higher than the original part's 553 mOhm. This specification should be verified against the actual component datasheet, as this value may represent a different measurement condition or parameter definition than standard ESR measurements at 120 Hz.

Q: Are Rubycon parts compatible with Cornell Dubilier designs?

A: Yes. The Rubycon MXG, MXK, and VXH series maintain identical electrical specifications (330 µF, 400 V, ±20% tolerance) and package configuration (radial, can snap-in, 10.00 mm lead spacing, through-hole mounting). Both manufacturers produce aluminum electrolytic capacitors to industry standards. Verify specific application requirements before substitution.

Q: What is the advantage of selecting 400VXH330MEFC25X40 over other substitutes?

A: The 400VXH330MEFC25X40 provides the longest thermal lifetime (5000 hours at 105°C) among all listed substitutes. This extended lifetime is beneficial for applications requiring maximum operational reliability and reduced maintenance intervals. The part maintains the original 25.00 mm diameter with 42.00 mm height.

Q: Can I use a substitute with different physical dimensions in my existing design?

A: Physical dimensions vary across substitutes. The case diameter ranges from 25.00 mm to 35.00 mm, and height ranges from 32.00 mm to 47.00 mm. Verify that the selected substitute fits within available board space and does not interfere with adjacent components. The 381LX331M400K452 and 400MXG330MEFCSN25X45 match the original part's height (47.00 mm) but differ in diameter.

Q: What does "Active" product status mean compared to "Obsolete"?

A: Active status indicates the part is currently manufactured and available for procurement. Obsolete status indicates the part is no longer manufactured. All listed substitutes are active, ensuring long-term availability and supply chain continuity.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitutes are ROHS3 compliant. The original 381LQ331M400J452 is also ROHS3 compliant. All parts maintain REACH unaffected status and EAR99 export classification.

Q: What is the significance of ripple current ratings?

A: Ripple current ratings specify the maximum AC current the capacitor can handle at specified frequencies without exceeding temperature limits. The original part specifies 1.44 A at 120 Hz and 2.02 A at 20 kHz. Substitutes with equal or higher ripple current ratings are suitable for the same applications. The 381LR series provides higher ripple current capability (1.71 A at 120 Hz, 2.44 A at 20 kHz).

Q: What does MSL rating "1 (Unlimited)" mean?

A: MSL (Moisture Sensitivity Level) rating 1 indicates unlimited shelf life without special moisture control requirements. The part can be stored and handled under standard conditions without desiccant packaging or time-limited exposure windows.

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