Equivalent & Substitute Parts for 381LX331M350A032

Part Overview

The 381LX331M350A032 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 general-purpose applications with a 3000-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 equivalent and substitute components for ongoing system support and new designs. Active alternatives with identical or enhanced electrical characteristics are available within the CDE product portfolio and from compatible manufacturers.

Key Parameters

Parameter	Value	Unit
Capacitance	330	µF
Voltage - Rated	350	V
Tolerance	±20%	-
ESR @ 120 Hz	603	mOhm
Lifetime @ 105°C	3000	Hrs
Operating Temperature Range	-25 to 105	°C
Ripple Current @ 120 Hz	1.2	A
Ripple Current @ 20 kHz	1.7	A
Lead Spacing	10.00	mm
Diameter	35.00	mm
Height - Seated (Max)	37.00	mm
Package Type	Radial, Can - Snap-In	-
Mounting Type	Through Hole	-
RoHS Status	ROHS3 Compliant	-
Product Status	Obsolete	-

Substitute Part Grouping Explanation

Substitution of the 381LX331M350A032 is determined by the following critical parameters:

Primary Substitution Criteria:

Capacitance: 330 µF (exact match required)
Voltage Rating: 350 V minimum (equal or higher acceptable)
Tolerance: ±20% (standard for aluminum electrolytic capacitors)
Package Type: Radial, Can - Snap-In (mechanical compatibility)
Lead Spacing: 10.00 mm (PCB footprint compatibility)
Mounting Type: Through Hole (assembly process compatibility)
Operating Temperature: -25°C to 105°C minimum (functional range)
Lifetime: 3000 Hrs @ 105°C minimum (reliability requirement)

Substitution Categories:

Direct Substitutes maintain identical electrical specifications and physical dimensions, differing only in product status (active vs. obsolete) or minor design revisions.

Upgrade Substitutes provide higher voltage ratings (385 V, 420 V) or improved ESR characteristics while maintaining the same capacitance, tolerance, and package footprint. These are suitable for applications where higher voltage margin or lower impedance is beneficial.

Similar Substitutes share the same capacitance and voltage rating but differ in physical dimensions (diameter and/or height), ESR characteristics, or lifetime ratings. These require PCB layout verification before implementation.

Parameter Comparison

Part Number	Manufacturer	Capacitance (µF)	Voltage (V)	ESR @ 120 Hz (mOhm)	Lifetime @ 105°C (Hrs)	Diameter (mm)	Height (mm)	Product Status	Inventory (Pcs)
381LX331M350A032	CDE	330	350	603	3000	35.00	37.00	Obsolete	792
381LX331M350A022	CDE	330	350	-	3000	35.00	32.00	Active	888
SLP331M350H3P3	CDE	330	350	1005	3000	35.00	32.00	Active	809
381LR331M420A032	CDE	330	420	402	3000	35.00	37.00	Active	1087
SLP331M385H5P3	CDE	330	385	1005	3000	35.00	37.00	Active	1009
SLP331M420H5P3	CDE	330	420	1005	3000	35.00	37.00	Active	813
381LQ331M350K022	CDE	330	350	502	2000	30.00	32.00	Active	724
381LX331M350J052	CDE	330	350	-	3000	25.00	52.00	Active	762
381LX331M350K042	CDE	330	350	-	3000	30.00	42.00	Active	980
381LX331M400A032	CDE	330	400	-	3000	35.00	37.00	Active	1283
SLPX331M350E3P3	CDE	330	350	603	3000	30.00	32.00	Active	962

Engineering Selection Recommendations

Direct Replacement (Identical Footprint and Electrical Performance):

The 381LX331M350A022 is the primary direct substitute. It maintains the same 330 µF capacitance, 350 V rating, 3000-hour lifetime at 105°C, and identical lead spacing (10.00 mm). The physical height is reduced from 37.00 mm to 32.00 mm, which is compatible with existing PCB layouts designed for the 381LX331M350A032. This part is active and available in inventory (888 pcs).

Footprint-Compatible Upgrade (Same Diameter and Height):

The 381LR331M420A032 and SLP331M385H5P3 provide higher voltage ratings (420 V and 385 V respectively) while maintaining the identical 35.00 mm diameter and 37.00 mm height of the original part. Both are active products with 3000-hour lifetimes at 105°C. The 381LR331M420A032 offers superior ESR performance (402 mOhm @ 120 Hz) compared to the original specification. These upgrades are suitable for applications requiring increased voltage margin or improved ripple current handling.

Voltage-Rated Alternative (Same Footprint):

The 381LX331M400A032 provides a 400 V rating with identical physical dimensions (35.00 mm diameter, 37.00 mm height) and 3000-hour lifetime. This part is active with high inventory availability (1283 pcs) and serves as an intermediate voltage option between the original 350 V and higher-rated alternatives.

Compliance and Certification:

All recommended substitutes are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 and HTSUS 8532.22.0040, matching the regulatory status of the original part. All are rated for -25°C to 105°C operating temperature range with moisture sensitivity level 1 (unlimited).

Inventory Availability:

Active substitutes are available in quantities ranging from 809 to 1283 pieces, ensuring supply continuity for production requirements.

Frequently Asked Questions (FAQ)

Q1: Can the 381LX331M350A022 be used as a direct replacement for the 381LX331M350A032?

A: Yes. Both parts share identical electrical specifications: 330 µF capacitance, 350 V rating, ±20% tolerance, 3000-hour lifetime at 105°C, and 10.00 mm lead spacing. The 381LX331M350A022 has a reduced height (32.00 mm vs. 37.00 mm), which is compatible with existing PCB layouts. The 381LX331M350A022 is active and recommended for new designs.

Q2: What is the difference between direct substitutes and upgrade substitutes?

A: Direct substitutes maintain the same voltage rating (350 V) and physical dimensions as the original part. Upgrade substitutes provide higher voltage ratings (385 V or 420 V) while maintaining the same capacitance and footprint. Upgrades are suitable when increased voltage margin or improved performance is required.

Q3: Are there physical dimension constraints when selecting a substitute?

A: Yes. The lead spacing (10.00 mm) must match for PCB compatibility. The diameter and height determine whether a part fits within the available board space. The 381LX331M350A022, 381LR331M420A032, SLP331M385H5P3, and SLP331M420H5P3 all maintain the 35.00 mm diameter and are compatible with the original footprint. Parts with different diameters (25.00 mm, 30.00 mm) require PCB layout verification.

Q4: What is the significance of ESR (Equivalent Series Resistance) in capacitor selection?

A: ESR affects ripple current handling and heat generation. The original 381LX331M350A032 specifies 603 mOhm @ 120 Hz. The 381LR331M420A032 offers lower ESR (402 mOhm @ 120 Hz), providing improved performance in high-ripple-current applications. The SLP series parts specify 1005 mOhm, which is higher and suitable for lower-frequency applications.

Q5: Can a 420 V rated capacitor replace a 350 V rated capacitor?

A: Yes, when the application circuit voltage does not exceed 350 V. Higher voltage ratings provide increased safety margin and are suitable for applications with voltage transients or design margin requirements. The 381LR331M420A032 and SLP331M420H5P3 are approved upgrades for this purpose.

Q6: What is the impact of lifetime rating differences?

A: The original part specifies 3000 hours at 105°C. All recommended direct and upgrade substitutes maintain this 3000-hour rating. The 381LQ331M350K022 offers a reduced 2000-hour lifetime and is classified as a similar alternative only; it is not recommended for applications requiring the full 3000-hour specification.

Q7: Are all substitutes RoHS3 compliant?

A: Yes. All recommended substitutes are ROHS3 compliant and REACH unaffected, matching the regulatory compliance of the original 381LX331M350A032.

Q8: Which substitute offers the best inventory availability?

A: The 381LX331M400A032 has the highest inventory (1283 pcs), followed by the 381LR331M420A032 (1087 pcs) and SLP331M385H5P3 (1009 pcs). All are active products suitable for immediate procurement.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message