Equivalent & Substitute Parts for 381LX331M350K042

Part Overview

The 381LX331M350K042 is a 330 µF, 350 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in a radial, can snap-in package. This component is rated for 3000 hours at 105°C and is designed for general-purpose applications requiring through-hole mounting. The part is Active in product status and fully compliant with RoHS3 and REACH regulations.

Substitute parts are necessary when the original component becomes unavailable, when higher voltage ratings or extended lifetime specifications are required for system reliability, or when alternative manufacturers' components offer improved electrical performance characteristics such as lower ESR or higher ripple current capacity.

Key Parameters

Parameter	Value	Unit
Capacitance	330	µF
Voltage - Rated	350	V
Tolerance	±20%	—
Lifetime @ Temperature	3000 Hrs @ 105°C	—
Operating Temperature Range	-25°C to 105°C	—
Lead Spacing	0.394" (10.00 mm)	—
Size / Dimension	1.181" Dia (30.00 mm)	—
Height - Seated (Max)	1.654" (42.00 mm)	—
Mounting Type	Through Hole	—
Package / Case	Radial, Can - Snap-In	—
Ripple Current @ 120 Hz	1.2	A
Polarization	Polar	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 381LX331M350K042 is determined by the following critical parameters:

Mandatory Compatibility Parameters:

Capacitance: 330 µF (exact match required)
Tolerance: ±20% (exact match required)
Polarization: Polar (exact match required)
Lead Spacing: 0.394" (10.00 mm) (exact match required)
Size / Dimension: 1.181" Dia (30.00 mm) (exact match required)
Mounting Type: Through Hole (exact match required)
Package / Case: Radial, Can - Snap-In (exact match required)

Allowable Upgrade Parameters:

Voltage - Rated: 350 V or higher (upgrades to 400 V or 450 V are acceptable)
Lifetime @ Temperature: 3000 Hrs @ 105°C or longer (upgrades to 5000 Hrs are acceptable)
Operating Temperature Range: -25°C to 105°C or wider (upgrades to -40°C are acceptable)
Ripple Current: 1.2 A @ 120 Hz or higher (upgrades provide improved performance margin)
ESR: Lower values provide improved performance (upgrades acceptable)

Substitute parts are grouped into upgrade categories based on voltage rating and lifetime enhancements. All substitute parts maintain identical mechanical dimensions, lead spacing, and mounting configuration to ensure direct PCB compatibility.

Parameter Comparison

Part Number	Manufacturer	Capacitance (µF)	Voltage (V)	Tolerance	Lifetime @ 105°C	Ripple Current @ 120 Hz (A)	ESR @ 100-120 Hz	Height (mm)	Inventory Status
381LX331M350K042	CDE	330	350	±20%	3000 Hrs	1.2	—	42.00	980 Pcs
381LR331M400K042	CDE	330	400	±20%	3000 Hrs	1.71	402 mOhm	42.00	2177 Pcs
381LX331M400K452	CDE	330	400	±20%	3000 Hrs	1.4	—	47.00	893 Pcs
450MXG330MEFCSN30X40	Rubycon	330	450	±20%	3000 Hrs	1.75	—	42.00	20200 Pcs
450VXH330MEFCSN30X40	Rubycon	330	450	±20%	5000 Hrs	1.75	—	42.00	100400 Pcs
B43508B5337M000	EPCOS - TDK Electronics	330	450	±20%	3000 Hrs	1.56	370 mOhm	42.00	139300 Pcs
B43644A5337M000	EPCOS - TDK Electronics	330	450	±20%	5000 Hrs	1.7	90 mOhm	42.00	2767 Pcs
ELXS451VSN331MR40S	Chemi-Con	330	450	±20%	5000 Hrs	1.52	—	42.00	1292 Pcs
LGN2W331MELB40	Nichicon	330	450	±20%	3000 Hrs	1.38	—	42.00	1000100 Pcs
LQS2W331MELB40	Nichicon	330	450	±20%	3000 Hrs	1.38	—	42.00	1000100 Pcs

Engineering Selection Recommendations

Direct Mechanical Compatibility: All substitute parts listed maintain the required mechanical specifications: 330 µF capacitance, ±20% tolerance, 0.394" (10.00 mm) lead spacing, 1.181" (30.00 mm) diameter, and radial snap-in package configuration. Parts with 42.00 mm height are direct drop-in replacements. The 381LX331M400K452 has a maximum height of 47.00 mm and requires verification of available PCB clearance before selection.

Voltage Rating Upgrades: The 381LR331M400K042 (400 V) and all 450 V rated substitutes provide enhanced voltage margin over the original 350 V specification. These upgrades are electrically compatible and do not require circuit modifications. Selection of higher voltage ratings is appropriate for applications requiring increased reliability margin or when operating conditions approach the original voltage specification.

Lifetime and Temperature Performance: Parts rated for 5000 hours at 105°C (450VXH330MEFCSN30X40, B43644A5337M000, ELXS451VSN331MR40S) provide extended operational life compared to the original 3000-hour specification. All substitute parts maintain the -25°C to 105°C operating temperature range, with EPCOS parts extending the lower limit to -40°C.

Compliance and Regulatory Status: All substitute parts are RoHS3 compliant and REACH unaffected. Moisture Sensitivity Level is 1 (Unlimited) for CDE and Nichicon parts, and Not Applicable for EPCOS and Chemi-Con parts, indicating no moisture sensitivity constraints during handling and storage.

Inventory and Availability: The 450VXH330MEFCSN30X40 (Rubycon) and LGN2W331MELB40 / LQS2W331MELB40 (Nichicon) offer the highest inventory levels, providing supply chain reliability. The B43508B5337M000 (EPCOS) also maintains substantial stock.

Frequently Asked Questions (FAQ)

Q: Can I use a 400 V or 450 V rated capacitor in place of the 350 V original part?

A: Yes. Higher voltage ratings are acceptable substitutes. A 400 V or 450 V capacitor will function correctly in a circuit designed for 350 V operation. The higher voltage rating provides additional safety margin and does not affect circuit performance negatively.

Q: What is the difference between the 381LR331M400K042 and 381LX331M400K452?

A: Both are 330 µF, 400 V CDE capacitors with identical electrical specifications. The primary difference is physical height: 381LR is 42.00 mm (direct replacement height), while 381LX331M400K452 is 47.00 mm (5 mm taller). Verify PCB clearance before selecting the taller variant.

Q: Why do some substitute parts have specified ESR values while others show a dash?

A: ESR (Equivalent Series Resistance) is provided when measured and specified by the manufacturer. Parts without ESR values listed do not have this parameter specified in the provided data. Lower ESR values indicate better high-frequency performance and reduced heat generation.

Q: Are all substitute parts direct PCB drop-in replacements?

A: All substitute parts with 42.00 mm height are direct drop-in replacements with identical lead spacing (10.00 mm) and diameter (30.00 mm). The 381LX331M400K452 at 47.00 mm height requires clearance verification. All parts use identical radial snap-in package configuration.

Q: What is the significance of the 3000-hour versus 5000-hour lifetime rating?

A: Lifetime rating indicates the expected operational duration at maximum rated temperature (105°C) before capacitance degradation reaches specified limits. The 5000-hour rating provides extended service life, appropriate for applications requiring higher reliability or longer operational periods between maintenance cycles.

Q: Can I substitute a Nichicon part for a CDE part?

A: Yes. The LGN2W331MELB40 and LQS2W331MELB40 (Nichicon) are electrically and mechanically compatible substitutes. All substitute parts listed meet the same mechanical and electrical compatibility requirements regardless of manufacturer.

Q: What does "Snap-In" package mean?

A: Snap-In refers to the mechanical mounting method where the capacitor's leads are inserted into PCB holes and secured by a snap-fit mechanism, as opposed to solder-only attachment. This package type is standard for radial aluminum electrolytic capacitors in through-hole applications.

Q: Are there any temperature range differences between substitute parts?

A: Most substitute parts operate from -25°C to 105°C, matching the original specification. EPCOS parts (B43508B5337M000 and B43644A5337M000) extend the lower operating limit to -40°C, providing enhanced cold-temperature performance if required by the application.

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