381EL331M450A052 Equivalent & Substitute Parts

Part Overview

The 381EL331M450A052 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 rated for general-purpose applications with a 7000-hour lifetime at 105°C and an operating temperature range of -25°C to 105°C. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for ongoing system support and new production requirements.

Key Parameters

Parameter	Value	Unit
Capacitance	330	µF
Tolerance	±20%	-
Voltage - Rated	450	V
ESR @ 120Hz	450	mOhm
Lifetime @ 105°C	7000	Hrs
Operating Temperature Range	-25 to 105	°C
Lead Spacing	10.00	mm
Case Diameter	35.00	mm
Height - Seated (Max)	50.00	mm
Mounting Type	Through Hole	-
Package / Case	Radial, Can - Snap-In	-
Polarization	Polar	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the 381EL331M450A052 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Capacitance: 330 µF (exact match required)
Voltage Rating: 450 V (minimum requirement; higher ratings acceptable)
Tolerance: ±20% (standard tolerance for this category)
Polarization: Polar (electrolytic capacitor type)
Lead Spacing: 10.00 mm (0.394 inches for PCB hole compatibility)
Package Type: Radial, Can - Snap-In (mechanical and electrical interface)
Mounting Type: Through Hole (board assembly compatibility)

Performance Parameters (Flexible Within Application Limits):

ESR (Equivalent Series Resistance): Varies by series; lower ESR indicates improved performance
Lifetime @ 105°C: Ranges from 2000 to 7000 hours; selection depends on application duty cycle
Ripple Current Capability: Varies by series; higher values support higher current applications
Case Diameter: 30.00 mm or 35.00 mm (both compatible with standard snap-in footprints)
Height: Varies from 35.00 mm to 52.00 mm (mechanical clearance must be verified)

Compliance Parameters:

RoHS Status: ROHS3 Compliant (all substitutes meet this requirement)
REACH Status: REACH Unaffected (all substitutes meet this requirement)

Substitutes are grouped into three categories based on manufacturer and series lineage: Cornell Dubilier Electronics (CDE) active series (381LQ, 381LR, 381LX, SLP), direct manufacturer alternatives (Chemi-Con LXM series, EPCOS B43504, Vishay MAL215957), and cross-manufacturer equivalents.

Parameter Comparison

Part Number	Manufacturer	Series	Capacitance (µF)	Voltage (V)	Tolerance	ESR @ 120Hz (mOhm)	Lifetime @ 105°C (Hrs)	Case Dia (mm)	Height Max (mm)	Status
381EL331M450A052	CDE	381EL	330	450	±20%	450	7000	35.00	50.00	Obsolete
381LQ331M450A032	CDE	381LQ	330	450	±20%	553	2000	35.00	37.00	Active
381LQ331M450K452	CDE	381LQ	330	450	±20%	553	2000	30.00	47.00	Active
381LR331M450A042	CDE	381LR	330	450	±20%	402	3000	35.00	42.00	Active
381LR331M450K052	CDE	381LR	330	450	±20%	402	3000	30.00	52.00	Active
381LX331M450A042	CDE	381LX	330	450	±20%	Not Specified	3000	35.00	42.00	Active
381LX331M450K052	CDE	381LX	330	450	±20%	Not Specified	3000	30.00	52.00	Active
SLP331M450H5P3	CDE	SLP0712TE	330	450	±20%	1005	3000	35.00	35.00	Active
ELXM451VSN331MA45S	Chemi-Con	LXM	330	450	±20%	Not Specified	7000	35.00	47.00	Active
B43504A5337M000	EPCOS - TDK	B43504	330	450	±20%	410	3000	30.00	52.00	Not For New Designs
MAL215957331E3	Vishay	159 PUL-SI	330	450	±20%	300	5000	35.00	42.00	Active

Engineering Selection Recommendations

Primary Recommendation - CDE 381LR Series:

The 381LR331M450A042 and 381LR331M450K052 represent the optimal active substitutes for the obsolete 381EL331M450A052. Both parts maintain identical electrical specifications (330 µF, 450 V, ±20% tolerance) with improved ESR performance (402 mOhm @ 120Hz versus 450 mOhm). The 381LR series provides 3000-hour lifetime at 105°C, which is acceptable for general-purpose applications. Both variants are ROHS3 compliant and carry active product status from CDE, ensuring long-term availability and supply chain stability.

Secondary Recommendation - Chemi-Con ELXM451VSN331MA45S:

The ELXM451VSN331MA45S from Chemi-Con's LXM series matches the original 7000-hour lifetime specification at 105°C, providing equivalent thermal performance. This part maintains all critical electrical parameters (330 µF, 450 V, ±20% tolerance) and is RoHS compliant. The 35.00 mm case diameter and 47.00 mm height provide direct mechanical compatibility. This option is suitable for applications requiring extended thermal endurance equivalent to the original design.

Alternative Recommendation - Vishay MAL215957331E3:

The MAL215957331E3 offers superior ESR performance (300 mOhm) and a 5000-hour lifetime at 105°C. This part is suitable for applications requiring lower impedance characteristics. The 35.00 mm case diameter and 42.00 mm height provide mechanical compatibility with standard PCB layouts.

Not Recommended for New Designs:

The EPCOS B43504A5337M000 carries a "Not For New Designs" status and should be used only for legacy system maintenance where exact form-factor matching is critical.

Mechanical Clearance Consideration:

When selecting between 35.00 mm and 30.00 mm case diameter variants, verify PCB footprint spacing. The 30.00 mm diameter options (381LQ331M450K452, 381LR331M450K052, 381LX331M450K052, B43504A5337M000) provide compact form factors but require confirmation of available board space.

Frequently Asked Questions (FAQ)

Q1: Can I substitute the 381EL331M450A052 with any 330 µF, 450 V aluminum electrolytic capacitor?

No. Substitution requires strict compliance with the radial, can snap-in package type and 10.00 mm lead spacing. These mechanical parameters ensure compatibility with existing PCB hole patterns and snap-in mounting fixtures. Case diameter (30.00 mm or 35.00 mm) and height must also be verified against available board clearance.

Q2: What is the significance of ESR (Equivalent Series Resistance) differences between substitute parts?

ESR directly affects capacitor performance in ripple current applications and thermal stability. The original 381EL has 450 mOhm ESR @ 120Hz. Substitutes with lower ESR (such as MAL215957331E3 at 300 mOhm) provide improved performance in high-ripple-current circuits. Substitutes with higher ESR (such as 381LQ series at 553 mOhm) are acceptable for lower-ripple applications but generate more heat. ESR selection depends on circuit ripple current requirements.

Q3: Why do some substitutes have shorter lifetimes (2000 hours) compared to the original (7000 hours)?

Lifetime ratings reflect thermal endurance under specified conditions (105°C). The 381LQ series (2000 hours) and 381LR series (3000 hours) are suitable for applications with moderate thermal stress. For applications requiring extended thermal endurance equivalent to the original 7000-hour specification, select the Chemi-Con ELXM451VSN331MA45S or Vishay MAL215957331E3 (5000 hours).

Q4: Are all substitute parts RoHS3 compliant?

Yes. All active substitute parts listed carry ROHS3 Compliant status. The EPCOS B43504A5337M000, marked "Not For New Designs," is also ROHS3 compliant but should be reserved for legacy system maintenance only.

Q5: What is the difference between 35.00 mm and 30.00 mm case diameter options?

Both diameters are compatible with standard snap-in mounting interfaces and maintain the 10.00 mm lead spacing. The 30.00 mm diameter provides a more compact footprint, reducing PCB space requirements. The 35.00 mm diameter matches the original part's form factor. Selection depends on available board clearance and mechanical constraints.

Q6: Can I use the 381LQ series (2000-hour lifetime) in a design originally specified for 7000-hour lifetime?

This depends on application duty cycle and thermal environment. The 381LQ series is suitable for general-purpose applications with moderate thermal stress. For applications with continuous high-temperature operation or extended service life requirements, select substitutes with longer lifetime ratings (Chemi-Con ELXM451VSN331MA45S at 7000 hours or Vishay MAL215957331E3 at 5000 hours).

Q7: What does "Snap-In" package type mean?

Snap-in refers to a mechanical mounting method where the capacitor's leads insert into a PCB-mounted snap fixture, providing both electrical connection and mechanical retention. This differs from standard through-hole soldering. Snap-in packages are common in industrial power supply and motor control applications where vibration resistance and rapid assembly/disassembly are required.

Q8: Are there any REACH or environmental compliance differences between substitutes?

No. All substitute parts listed carry "REACH Unaffected" status, indicating compliance with REACH regulations. All active parts are ROHS3 compliant. Environmental compliance is uniform across all recommended substitutes.

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