Equivalent & Substitute Parts for 381LX331M250J032

Part Overview

The Cornell Dubilier Electronics 381LX331M250J032 is a 330 µF, 250 V aluminum electrolytic capacitor in radial, can snap-in configuration. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design support and procurement. The part operates across a temperature range of -40°C to 105°C with a rated lifetime of 3000 hours at 105°C, serving general-purpose applications requiring stable capacitance and low equivalent series resistance.

Key Parameters

Parameter	Value	Unit
Capacitance	330	µF
Tolerance	±20%	—
Voltage - Rated	250	V
ESR @ 120 Hz	603	mOhm
Lifetime @ 105°C	3000	Hrs
Operating Temperature Range	-40 to 105	°C
Lead Spacing	10.00	mm
Diameter	25.00	mm
Height (Seated Max)	37.00	mm
Mounting Type	Through Hole	—
Package / Case	Radial, Can - Snap-In	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 381LX331M250J032 is determined by the following critical parameters:

Primary Substitution Criteria:

Capacitance: 330 µF (exact match required)
Tolerance: ±20% (exact match required)
Voltage Rating: 250 V (minimum; higher ratings acceptable)
Mounting Type: Through Hole, Radial, Can - Snap-In (exact match required)
Lead Spacing: 10.00 mm (exact match required)
Operating Temperature Range: -40°C to 105°C (minimum requirement)
Lifetime: 3000 Hrs @ 105°C (minimum requirement)

Secondary Compatibility Parameters:

Polarization: Polar (fixed for this category)
RoHS Compliance: ROHS3 Compliant (regulatory requirement)
ESR and ripple current ratings: Acceptable within application-specific limits

Substitute parts are classified into two categories:

Direct Substitutes maintain all primary criteria with identical or superior performance characteristics:

381LX331M250J022 (Cornell Dubilier Electronics, 381LX series)
LGN2E331MELA25 (Nichicon, LGN series)
LGU2E331MELA (Nichicon, LGU series)

Similar Substitutes maintain core electrical specifications but differ in secondary parameters such as physical dimensions, ESR, or lifetime ratings:

381LR331M250J022 (Cornell Dubilier Electronics, 381LR series)
381LQ331M250H022 (Cornell Dubilier Electronics, 381LQ series)
381LX331M315J052 and 381LX331M315J452 (higher voltage ratings)
LP331M250E3P3 (Cornell Dubilier Electronics, LP series)
SLPX331M250A3P3 (Cornell Dubilier Electronics, SLPX series)
LGR2E331MELA35 (Nichicon, LGR series)

Parameter Comparison

Part Number	Manufacturer	Series	Capacitance (µF)	Voltage (V)	Tolerance	ESR @ 120Hz (mOhm)	Lifetime @ 105°C (Hrs)	Diameter (mm)	Height (mm)	Status
381LX331M250J032	Cornell Dubilier	381LX	330	250	±20%	603	3000	25.00	37.00	Obsolete
381LX331M250J022	Cornell Dubilier	381LX	330	250	±20%	—	3000	25.00	32.00	Active
381LR331M250J022	Cornell Dubilier	381LR	330	250	±20%	452	3000	25.00	32.00	Active
381LQ331M250H022	Cornell Dubilier	381LQ	330	250	±20%	502	2000	22.00	32.00	Active
381LX331M315J052	Cornell Dubilier	381LX	330	315	±20%	—	3000	25.00	52.00	Active
381LX331M315J452	Cornell Dubilier	381LX	330	315	±20%	—	3000	25.00	47.00	Active
LP331M250E3P3	Cornell Dubilier	LP	330	250	±20%	750	1000	30.00	30.00	Active
SLPX331M250A3P3	Cornell Dubilier	SLPX	330	250	±20%	603	3000 @ 85°C	22.00	30.00	Active
LGN2E331MELA25	Nichicon	LGN	330	250	±20%	—	3000	25.00	27.00	Active
LGR2E331MELA35	Nichicon	LGR	330	250	±20%	—	10000	25.00	37.00	Active
LGU2E331MELA	Nichicon	LGU	330	250	±20%	—	3000	25.00	30.00	Active

Engineering Selection Recommendations

For Direct Replacement (Minimum Modification):

The 381LX331M250J022 from Cornell Dubilier Electronics is the primary direct substitute. It maintains identical electrical specifications (330 µF, 250 V, ±20%, 3000 Hrs @ 105°C) and mechanical compatibility (10.00 mm lead spacing, 25.00 mm diameter, through-hole radial snap-in package). The reduced height (32.00 mm versus 37.00 mm) provides improved board layout flexibility. Product status is Active with ROHS3 compliance.

The 381LR331M250J022 offers superior performance with lower ESR (452 mOhm versus 603 mOhm) and higher ripple current ratings, enabling applications with increased thermal or electrical stress. Height remains 32.00 mm. Product status is Active.

For Extended Lifetime Applications:

The LGR2E331MELA35 from Nichicon provides extended operational lifetime (10000 Hrs @ 105°C versus 3000 Hrs), maintaining identical capacitance, voltage, and tolerance specifications. Physical dimensions match the original part (25.00 mm diameter, 37.00 mm height). Product status is Active with ROHS3 compliance.

For Compact Form Factor:

The LGN2E331MELA25 and LGU2E331MELA from Nichicon reduce height to 27.00 mm and 30.00 mm respectively, while maintaining all electrical specifications. Both are Active products with ROHS3 compliance.

For Higher Voltage Applications:

The 381LX331M315J052 and 381LX331M315J452 provide 315 V rating with identical capacitance and 3000 Hrs @ 105°C lifetime. These accommodate applications requiring voltage margin above 250 V. Both are Active products.

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility with the original part.

Frequently Asked Questions (FAQ)

Q: Can 381LR331M250J022 replace 381LX331M250J032 directly?

A: Yes. Both parts share identical capacitance (330 µF), voltage rating (250 V), tolerance (±20%), and lifetime (3000 Hrs @ 105°C). The 381LR series exhibits lower ESR (452 mOhm versus 603 mOhm), which is a performance improvement. Height is reduced from 37.00 mm to 32.00 mm, requiring verification of available board space.

Q: What is the difference between 381LX331M250J022 and 381LX331M250J032?

A: Both are 381LX series parts with identical electrical specifications. The primary difference is height: 32.00 mm (J022) versus 37.00 mm (J032). The J022 variant is currently Active, while the J032 is Obsolete.

Q: Can I use 381LQ331M250H022 as a substitute?

A: 381LQ331M250H022 maintains capacitance, voltage, and tolerance specifications. However, lifetime is reduced to 2000 Hrs @ 105°C (versus 3000 Hrs), and diameter is reduced to 22.00 mm. Use only if application lifetime requirements are 2000 hours or less and board layout accommodates the smaller diameter.

Q: Are Nichicon LGN, LGR, and LGU series parts compatible with Cornell Dubilier 381LX?

A: Yes, for electrical specifications. All maintain 330 µF, 250 V, ±20%, and 3000 Hrs @ 105°C (LGN and LGU) or 10000 Hrs @ 105°C (LGR). Physical dimensions vary: LGN height is 27.00 mm, LGU height is 30.00 mm, and LGR height is 37.00 mm. All use 10.00 mm lead spacing and 25.00 mm diameter. Verify board layout compatibility before selection.

Q: What does ESR affect in capacitor selection?

A: Equivalent Series Resistance (ESR) determines ripple current handling capability and heat dissipation. Lower ESR (381LR at 452 mOhm) supports higher ripple currents and reduced thermal stress. Higher ESR (LP331M250E3P3 at 750 mOhm) is acceptable for lower-stress applications. ESR values not specified in datasheets indicate manufacturer discretion within acceptable ranges.

Q: Can I use higher voltage-rated parts like 381LX331M315J052?

A: Yes. Higher voltage ratings (315 V versus 250 V) are electrically compatible and provide voltage margin. Physical dimensions increase: height becomes 52.00 mm (J052) or 47.00 mm (J452). Verify board layout and mounting clearance before substitution.

Q: What is the difference between SLPX331M250A3P3 and 381LX331M250J032?

A: SLPX331M250A3P3 maintains capacitance, voltage, and ESR (603 mOhm). Lifetime is rated at 3000 Hrs @ 85°C (not 105°C), and maximum operating temperature is 85°C (not 105°C). Use only in applications with maximum ambient temperature of 85°C. Physical dimensions are more compact: 22.00 mm diameter, 30.00 mm height.

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 original 381LX331M250J032.

Q: Which substitute offers the longest operational lifetime?

A: LGR2E331MELA35 from Nichicon provides 10000 Hrs @ 105°C, compared to 3000 Hrs for most alternatives. This part maintains identical electrical specifications and physical dimensions (25.00 mm diameter, 37.00 mm height) to the original.

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