380LX331M350K042 Equivalent & Substitute Parts

Part Overview

The 380LX331M350K042 is a 330 µF, 350 V aluminum electrolytic capacitor in a radial, can snap-in package manufactured by Cornell Dubilier Electronics (CDE). This component is classified as obsolete, though 725 pieces remain in stock. The part operates across a temperature range of -25°C to 85°C with a rated lifetime of 3000 hours at 85°C and an equivalent series resistance (ESR) of 603 mOhm. As an obsolete product, equivalent and substitute parts are necessary for ongoing system support, design updates, and long-term component availability assurance.

Key Parameters

Parameter	Value
Capacitance	330 µF
Voltage Rating	350 V
Tolerance	±20%
ESR (Equivalent Series Resistance)	603 mOhm
Lifetime @ Temperature	3000 Hrs @ 85°C
Operating Temperature Range	-25°C ~ 85°C
Lead Spacing	0.394" (10.00 mm)
Case Diameter	1.181" (30.00 mm)
Height (Seated Max)	1.654" (42.00 mm)
Mounting Type	Through Hole
Package Type	Radial, Can - Snap-In
Polarization	Polar
RoHS Status	ROHS3 Compliant
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution of the 380LX331M350K042 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Criteria:

Capacitance: 330 µF (exact match required)
Tolerance: ±20% (exact match required)
Voltage Rating: 350 V minimum (equal or higher voltage acceptable)
Mounting Type: Through Hole (exact match required)
Package Type: Radial, Can - Snap-In (exact match required)
Lead Spacing: 0.394" (10.00 mm) (exact match required)
Case Diameter: 1.181" (30.00 mm) (exact match required)
Height: 1.654" (42.00 mm) (exact match required)
Polarization: Polar (exact match required)
RoHS Compliance: ROHS3 Compliant (maintained)

Acceptable Variations:

Voltage Rating: May be increased above 350 V for direct substitution
Operating Temperature Range: May be extended (e.g., -25°C ~ 105°C acceptable)
Lifetime @ Temperature: May be equal or greater
ESR: May be lower (improved performance)
Product Status: Active parts preferred over obsolete

Substitute parts are grouped into two categories: Upgrade parts (improved specifications while maintaining core compatibility) and Similar parts (alternative configurations with identical electrical ratings but different physical dimensions or performance characteristics).

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	Tolerance	ESR	Lifetime @ Temp	Temp Range	Case Dia	Height	Status
380LX331M350K042	CDE	330 µF	350 V	±20%	603 mOhm	3000 Hrs @ 85°C	-25°C ~ 85°C	1.181" (30 mm)	1.654" (42 mm)	Obsolete
380LX331M400K042	CDE	330 µF	400 V	±20%	550 mOhm @ 120Hz	3000 Hrs @ 85°C	-25°C ~ 85°C	1.181" (30 mm)	1.654" (42 mm)	Active
381LR331M400K042	CDE	330 µF	400 V	±20%	402 mOhm @ 120Hz	3000 Hrs @ 105°C	-25°C ~ 105°C	1.181" (30 mm)	1.654" (42 mm)	Active
381LX331M350K042	CDE	330 µF	350 V	±20%	Not Specified	3000 Hrs @ 105°C	-25°C ~ 105°C	1.181" (30 mm)	1.654" (42 mm)	Active
381LX331M400K042	CDE	330 µF	400 V	±20%	Not Specified	3000 Hrs @ 105°C	-25°C ~ 105°C	1.181" (30 mm)	1.654" (42 mm)	Active
380LQ331M350J032	CDE	330 µF	350 V	±20%	603 mOhm @ 120Hz	2000 Hrs @ 85°C	-25°C ~ 85°C	0.984" (25 mm)	1.457" (37 mm)	Active
380LX331M350A022	CDE	330 µF	350 V	±20%	500 mOhm @ 120Hz	3000 Hrs @ 85°C	-25°C ~ 85°C	1.378" (35 mm)	1.260" (32 mm)	Active
380LX331M350J052	CDE	330 µF	350 V	±20%	500 mOhm	3000 Hrs @ 85°C	-25°C ~ 85°C	0.984" (25 mm)	2.047" (52 mm)	Active
SLPX331M385E7P3	CDE	330 µF	385 V	±20%	603 mOhm @ 120Hz	3000 Hrs @ 85°C	-25°C ~ 85°C	1.181" (30 mm)	1.654" (42 mm)	Active
337LBB400M2DF	CDE / Illinois Capacitor	330 µF	400 V	±20%	753.57 mOhm @ 120Hz	3000 Hrs @ 85°C	-40°C ~ 85°C	1.181" (30 mm)	1.654" (42 mm)	Active
337LBB450M2DG	CDE / Illinois Capacitor	330 µF	450 V	±20%	753.57 mOhm @ 120Hz	3000 Hrs @ 85°C	-40°C ~ 85°C	1.181" (30 mm)	1.654" (42 mm)	Active

Engineering Selection Recommendations

Direct Replacement (Identical Form Factor):

The following parts maintain identical physical dimensions (1.181" diameter, 1.654" height, 10.00 mm lead spacing) and are suitable for direct substitution in applications where the original 380LX331M350K042 is mounted:

381LX331M350K042: Active product with identical voltage rating (350 V) and same physical footprint. Extended operating temperature range (-25°C ~ 105°C) and improved thermal performance (3000 Hrs @ 105°C) provide enhanced reliability. Recommended for new designs and long-term support.
380LX331M400K042: Active product with increased voltage rating (400 V) and reduced ESR (550 mOhm @ 120Hz vs. 603 mOhm). Maintains identical physical dimensions and thermal lifetime. Suitable for applications requiring higher voltage margin.
381LX331M400K042: Active product combining increased voltage rating (400 V) with extended temperature range (-25°C ~ 105°C). Provides maximum design margin and thermal performance.
381LR331M400K042: Active product with highest performance specifications: 400 V rating, lowest ESR (402 mOhm @ 120Hz), extended temperature range (-25°C ~ 105°C), and superior thermal lifetime (3000 Hrs @ 105°C). Recommended for demanding applications.
SLPX331M385E7P3: Active product with intermediate voltage rating (385 V), identical physical dimensions, and matching thermal specifications. Suitable for applications requiring voltage between 350 V and 400 V.
337LBB400M2DF and 337LBB450M2DG: Active products from Cornell Dubilier / Illinois Capacitor with identical physical dimensions. Extended lower temperature limit (-40°C ~ 85°C) suitable for cold-environment applications. Higher ESR (753.57 mOhm @ 120Hz) requires thermal analysis in ripple-current-sensitive circuits.

Alternative Form Factors (Different Physical Dimensions):

The following parts maintain identical electrical specifications (330 µF, 350 V, ±20%, 3000 Hrs @ 85°C) but with different physical dimensions:

380LQ331M350J032: Smaller diameter (0.984" vs. 1.181") and reduced height (1.457" vs. 1.654"). Suitable for space-constrained applications. Reduced thermal lifetime (2000 Hrs @ 85°C) requires verification in thermal-sensitive applications.
380LX331M350A022: Larger diameter (1.378" vs. 1.181") with reduced height (1.260" vs. 1.654"). Improved ESR (500 mOhm @ 120Hz). Requires PCB layout verification due to different footprint.
380LX331M350J052: Smaller diameter (0.984" vs. 1.181") with increased height (2.047" vs. 1.654"). Improved ESR (500 mOhm). Requires clearance verification for vertical space.

Product Status Consideration:

All recommended substitute parts carry Active product status, ensuring ongoing manufacturing support, availability, and technical documentation. The original 380LX331M350K042 (Obsolete status) should be replaced in new designs with one of the Active alternatives listed above.

Compliance Verification:

All substitute parts maintain ROHS3 compliance and REACH Unaffected status, matching the regulatory requirements of the original component.

Frequently Asked Questions (FAQ)

Q: Can I use a 400 V rated capacitor in place of the 350 V 380LX331M350K042?

A: Yes. Higher voltage ratings are acceptable substitutes. Parts 380LX331M400K042, 381LR331M400K042, 381LX331M400K042, 337LBB400M2DF, and 337LBB450M2DG all provide equal or greater voltage margin. The circuit will operate safely with the higher voltage rating.

Q: What is the difference between 380LX and 381LX series parts?

A: The 381LX series extends the operating temperature range to -25°C ~ 105°C and improves thermal lifetime to 3000 Hrs @ 105°C, compared to the 380LX series which operates at -25°C ~ 85°C with 3000 Hrs @ 85°C. The 381LX series is recommended for applications requiring enhanced thermal performance or operation in elevated-temperature environments.

Q: Can I use 380LQ331M350J032 as a direct replacement?

A: No. While the electrical specifications (330 µF, 350 V, ±20%) are identical, the physical dimensions differ significantly. The 380LQ331M350J032 has a smaller diameter (0.984" vs. 1.181") and reduced height (1.457" vs. 1.654"). This part requires PCB layout modification and cannot be used in existing through-hole footprints designed for the original component. Additionally, the thermal lifetime is reduced to 2000 Hrs @ 85°C.

Q: What does ESR (Equivalent Series Resistance) mean, and why does it vary between parts?

A: ESR represents the internal resistance of the capacitor at a specified frequency (typically 120 Hz). Lower ESR values indicate better performance in ripple-current applications and reduced heat generation. Parts with lower ESR (such as 381LR331M400K042 at 402 mOhm) are preferred for high-ripple-current circuits. Parts with higher ESR (such as 337LBB400M2DF at 753.57 mOhm) require thermal analysis in ripple-sensitive applications.

Q: Is the 381LR331M400K042 always the best choice?

A: The 381LR331M400K042 offers the best overall specifications (lowest ESR, highest temperature rating, highest voltage rating). However, the optimal choice depends on application requirements. For applications operating at or below 85°C with 350 V maximum voltage, the 381LX331M350K042 provides adequate performance at potentially lower cost. For cost-sensitive applications not requiring extended temperature range, the 380LX331M400K042 is suitable.

Q: Can I use parts with different physical dimensions if they fit mechanically?

A: Physical fit alone is insufficient. The 380LX331M350A022 (larger diameter, shorter height) and 380LX331M350J052 (smaller diameter, taller height) have different footprints and require PCB layout verification. Additionally, different physical dimensions may affect thermal dissipation characteristics. Mechanical fit must be confirmed with PCB design and thermal analysis before substitution.

Q: What is the significance of the "Snap-In" package designation?

A: The snap-in package indicates a specific mechanical mounting style using a snap-lock mechanism for through-hole PCB assembly. All substitute parts listed maintain this snap-in package type, ensuring compatibility with existing PCB mounting hardware and assembly processes.

Q: Why is the original 380LX331M350K042 marked as Obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. While 725 pieces remain in stock, long-term availability cannot be assured. Active substitute parts (such as 381LX331M350K042 or 381LR331M400K042) should be specified in new designs to ensure ongoing component availability and manufacturing support.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and REACH Unaffected status, matching the regulatory requirements of the original 380LX331M350K042.

Q: What is the difference between the 337LBB series and the 380LX/381LX series?

A: The 337LBB series (Illinois Capacitor brand, manufactured by Cornell Dubilier) maintains identical physical dimensions and electrical ratings but features an extended lower temperature limit (-40°C vs. -25°C). The 337LBB series has higher ESR (753.57 mOhm @ 120Hz), which may impact performance in high-ripple-current applications. The 337LBB series is suitable for cold-environment applications where the extended lower temperature range is required.

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