Equivalent & Substitute Parts for 380LX331M400A032

Part Overview

The Cornell Dubilier Electronics 380LX331M400A032 is a 330 µF, 400 V aluminum electrolytic capacitor in radial, can snap-in package configuration. This component is rated for general-purpose applications with a 3000-hour lifetime at 85°C and an operating temperature range of -25°C to 85°C. The part is Active in product status and fully compliant with RoHS3 and REACH regulations.

Equivalent and substitute parts are identified based on matching or exceeding the core electrical and mechanical specifications: capacitance value (330 µF), voltage rating (400 V or higher), package type (radial snap-in), lead spacing (10.00 mm), and physical dimensions. Substitutes are grouped by their relationship to the main part: direct equivalents with identical specifications, upgrades offering enhanced performance characteristics, and similar alternatives with minor dimensional or electrical variations.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Capacitance	330	µF	Critical - must match exactly
Voltage Rating	400	V	Critical - substitutes must equal or exceed
Tolerance	±20%	%	Critical - must match
Package Type	Radial, Can - Snap-In	-	Critical - must match for mechanical compatibility
Lead Spacing	10.00	mm	Critical - must match for PCB mounting
Diameter	35.00	mm	Important - affects board layout
Height (Seated Max)	37.00	mm	Important - affects clearance requirements
ESR @ 120 Hz	502	mOhm	Performance - lower values indicate better quality
Lifetime @ 85°C	3000	Hrs	Performance - higher values indicate longer service life
Operating Temperature Range	-25 to 85	°C	Application-dependent - must meet system requirements
Ripple Current @ 120 Hz	1.4	A	Performance - affects thermal stability
Mounting Type	Through Hole	-	Critical - must match assembly process
RoHS Status	ROHS3 Compliant	-	Regulatory - required for many applications

Substitute Part Grouping Explanation

Substitution logic for the 380LX331M400A032 is based on the following criteria:

Critical Parameters (Must Match):

Capacitance: 330 µF (exact match required)
Voltage Rating: 400 V minimum (equal or higher acceptable)
Tolerance: ±20% (exact match required)
Package Type: Radial, Can - Snap-In (exact match required)
Lead Spacing: 10.00 mm (exact match required)
Mounting Type: Through Hole (exact match required)

Performance Parameters (Equal or Better Acceptable):

ESR (Equivalent Series Resistance): Lower values indicate superior performance
Lifetime @ Temperature: Higher values indicate extended service life
Operating Temperature Range: Must encompass application requirements
Ripple Current Ratings: Higher values provide greater thermal margin

Physical Dimensions (Compatibility Dependent):

Diameter: 35.00 mm (primary dimension; minor variations acceptable if board layout permits)
Height: 37.00 mm (primary dimension; variations require clearance verification)

Substitutes are classified as:

Direct Equivalents: Identical electrical and mechanical specifications
Upgrades: Enhanced performance (lower ESR, higher lifetime, extended temperature range) while maintaining mechanical compatibility
Similar Alternatives: Minor dimensional or electrical variations requiring application-specific verification

Parameter Comparison

Part Number	Manufacturer	Capacitance (µF)	Voltage (V)	Tolerance (%)	ESR @ 120Hz (mOhm)	Lifetime @ Temp (Hrs)	Temp Range (°C)	Diameter (mm)	Height (mm)	Product Status
380LX331M400A032	Cornell Dubilier Electronics	330	400	±20	502 @ 85°C	3000 @ 85°C	-25 to 85	35.00	37.00	Active
380LQ331M400A012	Cornell Dubilier Electronics	330	400	±20	603 @ 120Hz	2000 @ 85°C	-25 to 85	35.00	27.00	Active
381LX331M400A032	Cornell Dubilier Electronics	330	400	±20	Not specified	3000 @ 105°C	-25 to 105	35.00	37.00	Active
380LQ331M400K022	Cornell Dubilier Electronics	330	400	±20	603 @ 120Hz	2000 @ 85°C	-25 to 85	30.00	32.00	Active
380LX331M450A042	Cornell Dubilier Electronics	330	450	±20	603	3000 @ 85°C	-25 to 85	35.00	42.00	Active
B43504B9337M000	EPCOS - TDK Electronics	330	400	±20	270 @ 100Hz	3000 @ 105°C	-40 to 105	35.00	37.00	Not For New Designs
LLS2G331MELC	Nichicon	330	400	±20	Not specified	3000 @ 85°C	-25 to 85	35.00	30.00	Active
450VXG330MEFCSN35X35	Rubycon	330	450	±20	Not specified	5000 @ 105°C	-25 to 105	35.00	37.00	Active
LQS2W331MELC35	Nichicon	330	450	±20	Not specified	3000 @ 105°C	-25 to 105	35.00	37.00	Active
MAL215966331E3	Vishay Beyschlag/Draloric/BC Components	330	400	±20	320	5000 @ 105°C	-25 to 105	35.00	37.00	Active

Engineering Selection Recommendations

Direct Equivalent Selection (380LQ331M400A012): The 380LQ331M400A012 maintains identical electrical specifications (330 µF, 400 V, ±20% tolerance) and mechanical compatibility (35 mm diameter, 10 mm lead spacing, through-hole snap-in package). However, this part exhibits higher ESR (603 mOhm vs. 502 mOhm) and reduced lifetime (2000 hours vs. 3000 hours at 85°C). Selection is appropriate for cost-sensitive applications where the reduced height (27 mm vs. 37 mm) provides board layout advantages and performance degradation is acceptable.

Upgrade Selection for Extended Temperature Range (381LX331M400A032): The 381LX331M400A032 is a direct mechanical and electrical equivalent with enhanced thermal performance. Operating temperature range extends to 105°C (vs. 85°C), and lifetime is maintained at 3000 hours at the elevated temperature. This upgrade is recommended for applications requiring higher ambient temperature operation or thermal margin. Identical physical dimensions ensure drop-in compatibility.

Upgrade Selection for Superior ESR and Lifetime (MAL215966331E3): The MAL215966331E3 from Vishay offers the lowest ESR (320 mOhm) and longest lifetime (5000 hours at 105°C) among 400 V alternatives. Extended operating temperature range (-25°C to 105°C) and Active product status support long-term supply continuity. Identical physical dimensions (35 mm diameter, 37 mm height) ensure mechanical compatibility. This part is recommended for applications prioritizing reliability and thermal stability.

Upgrade Selection for Higher Voltage Rating (450VXG330MEFCSN35X35): The Rubycon 450VXG330MEFCSN35X35 provides 450 V rating (vs. 400 V) with extended lifetime (5000 hours at 105°C) and operating temperature to 105°C. Identical physical dimensions and lead spacing ensure mechanical compatibility. Selection is appropriate for applications requiring voltage derating margin or operating in elevated temperature environments.

Alternative Selection with Dimensional Variation (380LQ331M400K022): The 380LQ331M400K022 maintains electrical specifications but features reduced physical dimensions (30 mm diameter, 32 mm height vs. 35 mm and 37 mm). This alternative is suitable only if board layout permits the smaller footprint. Higher ESR (603 mOhm) and reduced lifetime (2000 hours) represent performance trade-offs.

Legacy Part Consideration (B43504B9337M000): The EPCOS B43504B9337M000 is marked "Not For New Designs" and should be avoided for new applications despite superior ESR (270 mOhm) and extended temperature range (-40°C to 105°C). Existing inventory may support legacy system maintenance only.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 380LX331M400A032 with a higher voltage-rated capacitor such as the 450 V versions?

A: Yes. Higher voltage ratings provide additional derating margin and are electrically compatible. The 450VXG330MEFCSN35X35 and LQS2W331MELC35 are direct mechanical substitutes with identical 35 mm diameter and 37 mm height. Verify that the application circuit design does not depend on the specific 400 V rating.

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

A: ESR directly affects capacitor heating under ripple current conditions and influences circuit performance in high-frequency applications. Lower ESR values (such as 270 mOhm in the B43504B9337M000 or 320 mOhm in the MAL215966331E3) indicate superior thermal performance and are preferred for demanding applications. The main part's 502 mOhm ESR is acceptable for general-purpose use.

Q: Why do some substitute parts have different heights despite identical diameter?

A: Capacitor height is determined by internal construction and the required lifetime rating. The 380LQ331M400A012 (27 mm height) and LLS2G331MELC (30 mm height) achieve 3000-hour lifetimes with more compact designs than the main part (37 mm). Height variations require verification of available board clearance before substitution.

Q: Is the 380LQ331M400K022 a suitable substitute despite its smaller 30 mm diameter?

A: The 380LQ331M400K022 is electrically compatible but physically smaller (30 mm vs. 35 mm diameter). Substitution is possible only if the PCB layout accommodates the reduced footprint. Verify that the smaller can diameter does not create mechanical interference with adjacent components or mounting hardware.

Q: What is the difference between the main part and the 381LX331M400A032 upgrade?

A: Both parts are mechanically identical (35 mm diameter, 37 mm height, 10 mm lead spacing) and electrically equivalent (330 µF, 400 V, ±20%). The 381LX upgrade extends the operating temperature range to 105°C and maintains 3000-hour lifetime at this elevated temperature. Selection depends on whether the application requires operation above 85°C.

Q: Can I use the MAL215966331E3 in place of the 380LX331M400A032?

A: Yes. The MAL215966331E3 is a direct mechanical substitute with identical dimensions and lead spacing. It offers superior performance with lower ESR (320 mOhm vs. 502 mOhm) and extended lifetime (5000 hours at 105°C vs. 3000 hours at 85°C). Extended operating temperature range (-25°C to 105°C) provides additional thermal margin. This substitution is recommended for applications prioritizing reliability.

Q: Why is the B43504B9337M000 marked "Not For New Designs"?

A: Legacy product status indicates that the manufacturer (EPCOS - TDK Electronics) has discontinued active development and support for this part. While existing inventory may be available, new designs should select Active-status alternatives to ensure long-term supply continuity and manufacturer support. The MAL215966331E3 and 381LX331M400A032 are recommended Active alternatives.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are RoHS3 compliant and REACH unaffected, matching the regulatory status of the main part. This compliance is maintained across all manufacturers (Cornell Dubilier Electronics, EPCOS, Nichicon, Rubycon, and Vishay).

Q: What is the practical difference between 400 V and 450 V rated capacitors in circuit operation?

A: Both ratings are suitable for 400 V circuit applications. The 450 V rating provides additional voltage derating margin (12.5% headroom) and typically correlates with enhanced internal construction. For applications operating at or near 400 V, the 450 V alternatives (450VXG330MEFCSN35X35, LQS2W331MELC35, 380LX331M450A042) offer improved reliability margins without circuit modification.

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