381LQ331M450K452 Equivalent & Substitute Parts Reference

Part Overview

The 381LQ331M450K452 is a 330 µF, 450 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in a radial, can snap-in package. This component is classified as Active product status and is designed for general-purpose applications requiring high-voltage energy storage and filtering. The part operates across a temperature range of -25°C to 105°C with a rated lifetime of 2000 hours at 105°C. Equivalent and substitute parts are identified based on matching or exceeding critical electrical parameters including capacitance, voltage rating, ESR characteristics, ripple current handling, and physical form factor compatibility with through-hole snap-in mounting.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Capacitance	330	µF	Critical - must match exactly
Voltage Rating	450	V	Critical - must match or exceed
Tolerance	±20%	%	Critical - must match
ESR @ 120 Hz	553	mOhm	Important - lower ESR indicates improved performance
Lifetime @ 105°C	2000	Hours	Important - longer lifetime acceptable
Operating Temperature Range	-25 to 105	°C	Critical - must match or exceed
Ripple Current @ 120 Hz	1.38	A	Important - must meet or exceed application requirements
Ripple Current @ 20 kHz	1.93	A	Important - must meet or exceed application requirements
Lead Spacing	10.00	mm	Critical - must match for PCB compatibility
Package Type	Radial, Can - Snap-In	-	Critical - must match mounting interface
Mounting Type	Through Hole	-	Critical - must match PCB assembly method
RoHS Status	ROHS3 Compliant	-	Important - regulatory compliance

Substitute Part Grouping Explanation

Substitute parts for the 381LQ331M450K452 are grouped based on strict adherence to the following substitution criteria:

Primary Matching Criteria (Non-Negotiable):

Capacitance: 330 µF (exact match required)
Voltage Rating: 450 V (exact match required)
Tolerance: ±20% (exact match required)
Lead Spacing: 10.00 mm (exact match required)
Package Type: Radial, Can - Snap-In (exact match required)
Mounting Type: Through Hole (exact match required)
Operating Temperature Range: -25°C to 105°C (exact match or extended range acceptable)
Polarization: Polar (exact match required)

Secondary Performance Criteria (Acceptable Variations):

ESR @ 120 Hz: Lower values indicate improved ripple current handling and reduced heat generation
Lifetime @ 105°C: Extended lifetime (3000 hours or 5000 hours) acceptable as performance enhancement
Ripple Current: Equal or higher values acceptable
Physical Dimensions (Diameter/Height): Variations acceptable if lead spacing and mounting interface remain compatible

Regulatory Compliance (Required):

RoHS3 Compliant (all substitutes must maintain compliance)
REACH Unaffected or REACH Compliant status

Substitutes are classified into two categories:

Similar Manufacturer Parts (Cornell Dubilier Electronics): Parts from the same manufacturer with identical electrical specifications but different series designations (381LQ, 381LR, 381LX) or alternative packaging configurations.
Direct Manufacturer Parts (Alternative Manufacturers): Parts from Rubycon and Chemi-Con that meet all primary matching criteria and provide equivalent or enhanced performance characteristics.

Parameter Comparison

Part Number	Manufacturer	Series	Capacitance (µF)	Voltage (V)	Tolerance (%)	ESR @ 120 Hz (mOhm)	Lifetime @ 105°C (Hrs)	Ripple Current @ 120 Hz (A)	Ripple Current @ 20 kHz (A)	Diameter (mm)	Height (mm)	Lead Spacing (mm)	Inventory (Pcs)
381LQ331M450K452	Cornell Dubilier	381LQ	330	450	±20	553	2000	1.38	1.93	30.00	47.00	10.00	925
381LQ331M450A032	Cornell Dubilier	381LQ	330	450	±20	553	2000	1.38	1.93	35.00	37.00	10.00	2069
381LR331M450A042	Cornell Dubilier	381LR	330	450	±20	402	3000	1.85	2.64	35.00	42.00	10.00	1267
381LR331M450K052	Cornell Dubilier	381LR	330	450	±20	402	3000	1.85	2.64	30.00	52.00	10.00	8623
381LX331M450A042	Cornell Dubilier	381LX	330	450	±20	—	3000	1.4	1.9	35.00	42.00	10.00	2189
381LX331M450K052	Cornell Dubilier	381LX	330	450	±20	—	3000	1.4	1.9	30.00	52.00	10.00	1027
SLP331M450H5P3	Cornell Dubilier	SLP0712TE	330	450	±20	1005	3000	—	—	35.00	35.00	10.00	4347
450MXG330MEFCSN30X40	Rubycon	MXG	330	450	±20	—	3000	1.75	2.45	30.00	42.00	10.00	20200
450MXK330MEFCFA30X30	Rubycon	MXK	330	450	±20	—	3000	1.58	2.212	30.00	32.00	10.00	273882
450VXH330MEFCSN30X40	Rubycon	VXH	330	450	±20	—	5000	1.75	2.45	30.00	42.00	10.00	100400
ELXS451VSN331MR40S	Chemi-Con	LXS	330	450	±20	—	5000	1.52	2.1736	30.00	42.00	10.00	1292

Engineering Selection Recommendations

Tier 1 - Direct Equivalents (Identical Electrical Performance):

The 381LQ331M450A032 is a direct equivalent to the 381LQ331M450K452. Both parts share identical electrical specifications (330 µF, 450 V, ±20%, 553 mOhm ESR, 2000 Hrs @ 105°C). The primary difference is physical form factor: the A032 variant has a larger diameter (35.00 mm) and reduced height (37.00 mm) compared to the K452 variant (30.00 mm diameter, 47.00 mm height). This substitution is valid only if the PCB layout accommodates the larger diameter footprint while maintaining the 10.00 mm lead spacing.

Tier 2 - Enhanced Performance Substitutes (Same Electrical Ratings, Improved Characteristics):

The 381LR series (381LR331M450A042 and 381LR331M450K052) provides improved performance over the base 381LQ series. These parts maintain identical capacitance, voltage, and tolerance specifications but offer:

Reduced ESR: 402 mOhm @ 120 Hz (versus 553 mOhm), resulting in lower heat dissipation and improved ripple current handling
Extended lifetime: 3000 hours @ 105°C (versus 2000 hours)
Higher ripple current ratings: 1.85 A @ 120 Hz and 2.64 A @ 20 kHz

The 381LR331M450K052 maintains the original 30.00 mm diameter but increases height to 52.00 mm. The 381LR331M450A042 uses a 35.00 mm diameter with 42.00 mm height. Both variants are suitable substitutes if physical space permits.

Tier 3 - Extended Lifetime Substitutes (3000 Hour Rating):

The 381LX series (381LX331M450A042 and 381LX331M450K052) provides 3000-hour lifetime at 105°C with ripple current ratings of 1.4 A @ 120 Hz and 1.9 A @ 20 kHz. ESR data is not provided for this series. These parts are suitable for applications where extended operational life is required and ripple current demands do not exceed the specified ratings.

Tier 4 - Alternative Manufacturer Substitutes (Rubycon and Chemi-Con):

Rubycon MXK series (450MXK330MEFCFA30X30) offers the highest inventory availability (273,882 pcs) with 3000-hour lifetime and maintains the compact 30.00 mm diameter, 32.00 mm height form factor. Ripple current ratings are 1.58 A @ 120 Hz and 2.212 A @ 20 kHz.

Rubycon MXG series (450MXG330MEFCSN30X40) and VXH series (450VXH330MEFCSN30X40) both provide 3000-hour and 5000-hour lifetimes respectively, with identical physical dimensions (30.00 mm diameter, 42.00 mm height) and ripple current ratings of 1.75 A @ 120 Hz and 2.45 A @ 20 kHz.

Chemi-Con LXS series (ELXS451VSN331MR40S) provides 5000-hour lifetime with ripple current ratings of 1.52 A @ 120 Hz and 2.1736 A @ 50 kHz, maintaining the 30.00 mm diameter, 42.00 mm height form factor.

Compliance and Regulatory Status:

All listed substitute parts maintain ROHS3 compliance and REACH Unaffected or REACH Compliant status, ensuring regulatory compatibility with the original 381LQ331M450K452 specification.

Frequently Asked Questions (FAQ)

Q1: Can I substitute the 381LQ331M450K452 with a part from a different manufacturer?

A: Yes. Rubycon and Chemi-Con parts listed in this reference meet all primary matching criteria: 330 µF capacitance, 450 V voltage rating, ±20% tolerance, 10.00 mm lead spacing, radial can snap-in package, and through-hole mounting. All substitute parts maintain ROHS3 compliance. Physical dimensions vary; verify PCB layout compatibility before selection.

Q2: What is the significance of ESR (Equivalent Series Resistance) in capacitor substitution?

A: ESR directly affects ripple current handling and heat generation. Lower ESR values indicate improved performance. The original 381LQ331M450K452 has 553 mOhm ESR @ 120 Hz. The 381LR series reduces this to 402 mOhm, allowing higher ripple current capacity and reduced thermal stress. For applications with high ripple current demands, lower ESR substitutes are preferred.

Q3: Does lifetime rating affect substitution compatibility?

A: Lifetime rating indicates operational hours at maximum rated temperature (105°C). The original part is rated for 2000 hours. Substitutes with 3000-hour or 5000-hour ratings provide extended operational life and are acceptable replacements. Shorter lifetime ratings are not acceptable substitutes.

Q4: Are physical dimension variations acceptable?

A: Physical dimensions (diameter and height) vary among substitutes. The critical constraint is lead spacing (10.00 mm), which must remain constant for PCB compatibility. Diameter and height variations are acceptable only if the PCB layout and mechanical enclosure accommodate the new form factor. Verify clearance before installation.

Q5: What is the difference between the 381LQ, 381LR, and 381LX series?

A: All three series share identical electrical ratings (330 µF, 450 V, ±20%). The 381LR series offers improved ESR (402 mOhm versus 553 mOhm) and extended lifetime (3000 hours versus 2000 hours). The 381LX series provides 3000-hour lifetime but does not specify ESR. Series designation reflects internal design improvements and performance enhancements.

Q6: Can I use the SLP331M450H5P3 as a substitute?

A: The SLP331M450H5P3 meets primary matching criteria (330 µF, 450 V, ±20%, 10.00 mm lead spacing, radial can snap-in, through-hole mounting). However, this part has significantly higher ESR (1.005 Ohm versus 553 mOhm) and does not specify ripple current ratings. This substitute is acceptable only for low-ripple-current applications where thermal performance is not critical.

Q7: Which substitute offers the best availability?

A: The Rubycon 450MXK330MEFCFA30X30 (MXK series) has the highest inventory availability at 273,882 pieces. This part maintains the compact 30.00 mm diameter, 32.00 mm height form factor and provides 3000-hour lifetime with adequate ripple current ratings (1.58 A @ 120 Hz, 2.212 A @ 20 kHz).

Q8: Are all substitutes RoHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain ROHS3 compliance, ensuring regulatory compatibility with the original 381LQ331M450K452 specification and compliance with electronic equipment directives.

Q9: What is the difference between 10 kHz and 20 kHz ripple current ratings?

A: Ripple current ratings vary by frequency. The original 381LQ331M450K452 specifies 1.38 A @ 120 Hz and 1.93 A @ 20 kHz. Some substitutes specify ripple current at 10 kHz instead of 20 kHz. When comparing ripple current capacity, use the frequency rating that matches your application's operating frequency. Higher frequency operation typically requires lower ripple current capacity.

Q10: Can I mix different substitute parts in the same circuit?

A: All listed substitutes are electrically equivalent and can be used interchangeably in the same circuit design. However, for consistency and simplified inventory management, use a single part number across all positions requiring 330 µF, 450 V aluminum electrolytic capacitors with snap-in mounting.

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