Equivalent & Substitute Parts for 381LQ331M250J012

Part Overview

The Cornell Dubilier Electronics 381LQ331M250J012 is a 330 µF, 250 V aluminum electrolytic capacitor in radial, can snap-in package configuration. This component is classified as obsolete product status. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications requiring 330 µF capacitance at 250 V rated voltage with general-purpose electrolytic capacitor performance characteristics.

Key Parameters

Parameter	Value
Capacitance	330 µF
Tolerance	±20%
Voltage - Rated	250 V
ESR (Equivalent Series Resistance)	502 mOhm @ 120 Hz
Lifetime @ Temperature	2000 Hrs @ 105°C
Operating Temperature Range	-40°C ~ 105°C
Polarization	Polar
Lead Spacing	0.394" (10.00 mm)
Package / Case	Radial, Can - Snap-In
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 381LQ331M250J012 is determined by the following critical parameters:

Primary Matching Criteria:

Capacitance: 330 µF (exact match required)
Voltage Rating: 250 V (exact match required)
Tolerance: ±20% (exact match required)
Polarization: Polar (exact match required)
Lead Spacing: 0.394" / 10.00 mm (exact match required)
Package Type: Radial, Can - Snap-In (exact match required)
Mounting Type: Through Hole (exact match required)

Secondary Compatibility Parameters:

Operating Temperature Range: -40°C ~ 105°C (minimum requirement)
ESR @ 120 Hz: Acceptable range 350 mOhm to 750 mOhm
Lifetime @ 105°C: Acceptable range 1000 Hrs to 3000 Hrs
RoHS Compliance: ROHS3 Compliant (required)

Substitute parts are grouped based on mechanical fit, electrical performance envelope, and regulatory compliance. Parts meeting all primary criteria and secondary compatibility parameters are classified as direct substitutes. Variations in ESR, lifetime rating, and physical dimensions (diameter/height) within acceptable ranges do not preclude substitution when primary parameters align.

Parameter Comparison

Part Number	Manufacturer	Series	Capacitance	Voltage	Tolerance	ESR @ 120/100 Hz	Lifetime @ 105°C	Diameter (mm)	Height (mm)	Product Status
381LQ331M250J012	CDE	381LQ	330 µF	250 V	±20%	502 mOhm @ 120 Hz	2000 Hrs	25.00	27.00	Obsolete
381LQ331M250H022	CDE	381LQ	330 µF	250 V	±20%	502 mOhm @ 120 Hz	2000 Hrs	22.00	32.00	Active
381LQ331M315J032	CDE	381LQ	330 µF	315 V	±20%	502 mOhm @ 120 Hz	2000 Hrs	25.00	37.00	Active
381LR331M250J022	CDE	381LR	330 µF	250 V	±20%	452 mOhm @ 120 Hz	3000 Hrs	25.00	32.00	Active
381LX331M250J022	CDE	381LX	330 µF	250 V	±20%	Not Specified	3000 Hrs	25.00	32.00	Active
LP331M250E3P3	CDE	LP	330 µF	250 V	±20%	750 mOhm @ 120 Hz	1000 Hrs	30.00	30.00	Active
B43508F2337M	EPCOS - TDK	B43508	330 µF	250 V	±20%	350 mOhm @ 100 Hz	3000 Hrs	25.00	27.00	Active
B43508F2337M2	EPCOS - TDK	B43508	330 µF	250 V	±20%	350 mOhm @ 100 Hz	3000 Hrs	25.00	27.00	Active
B43508F2337M60	EPCOS - TDK	B43508	330 µF	250 V	±20%	350 mOhm @ 100 Hz	3000 Hrs	25.00	27.00	Active
B43508F2337M62	EPCOS - TDK	B43508	330 µF	250 V	±20%	350 mOhm @ 100 Hz	3000 Hrs	25.00	27.00	Active
B43508F2337M67	EPCOS - TDK	B43508	330 µF	250 V	±20%	350 mOhm @ 100 Hz	3000 Hrs	25.00	27.00	Active

Engineering Selection Recommendations

Direct Substitutes (Highest Compatibility):

The EPCOS - TDK Electronics B43508 series parts (B43508F2337M, B43508F2337M2, B43508F2337M60, B43508F2337M62, B43508F2337M67) provide direct substitution for the 381LQ331M250J012. These parts match all primary electrical and mechanical parameters: 330 µF capacitance, 250 V voltage rating, ±20% tolerance, 10.00 mm lead spacing, radial snap-in package, and through-hole mounting. The B43508 series demonstrates improved ESR performance (350 mOhm @ 100 Hz versus 502 mOhm @ 120 Hz) and extended lifetime rating (3000 Hrs @ 105°C versus 2000 Hrs @ 105°C). All variants maintain ROHS3 compliance and active product status.

Primary Alternatives (Cornell Dubilier Electronics):

The 381LQ331M250H022 is an active Cornell Dubilier Electronics part maintaining identical electrical specifications (330 µF, 250 V, ±20%, 502 mOhm @ 120 Hz, 2000 Hrs @ 105°C). Physical dimensions differ slightly (22.00 mm diameter, 32.00 mm height versus 25.00 mm diameter, 27.00 mm height), requiring PCB layout verification for mechanical fit.

The 381LR331M250J022 offers improved performance characteristics within the same manufacturer family: reduced ESR (452 mOhm @ 120 Hz) and extended lifetime (3000 Hrs @ 105°C). Physical dimensions match the original part (25.00 mm diameter, 32.00 mm height). Active product status ensures supply availability.

The 381LX331M250J022 provides extended lifetime rating (3000 Hrs @ 105°C) with matching mechanical dimensions (25.00 mm diameter, 32.00 mm height). Active product status supports long-term availability.

Secondary Alternatives:

The 381LQ331M315J032 operates at elevated voltage rating (315 V versus 250 V) with identical capacitance and tolerance specifications. This part is suitable for applications where higher voltage margin is acceptable or required. Physical dimensions differ (25.00 mm diameter, 37.00 mm height).

The LP331M250E3P3 maintains 330 µF capacitance and 250 V rating with higher ESR (750 mOhm @ 120 Hz) and reduced lifetime (1000 Hrs @ 105°C). Physical dimensions differ significantly (30.00 mm diameter, 30.00 mm height). This part is suitable only when space constraints or specific application requirements permit the performance trade-offs.

Selection Criteria:

Choose B43508 series parts when supply of original 381LQ331M250J012 is unavailable and improved performance characteristics are acceptable. Select 381LR331M250J022 or 381LX331M250J022 for continued Cornell Dubilier Electronics sourcing with enhanced reliability. All recommended substitutes maintain ROHS3 compliance and active manufacturing status.

Frequently Asked Questions (FAQ)

Q: Can the 381LQ331M250H022 replace the 381LQ331M250J012 in existing PCB designs?

A: The 381LQ331M250H022 matches all electrical specifications and lead spacing (10.00 mm). However, physical dimensions differ: 22.00 mm diameter and 32.00 mm height versus 25.00 mm diameter and 27.00 mm height. PCB layout verification is required to confirm mechanical clearance and mounting compatibility before implementation.

Q: What is the difference between the B43508F2337M variants?

A: The B43508F2337M, B43508F2337M2, B43508F2337M60, B43508F2337M62, and B43508F2337M67 are functionally equivalent. All variants specify identical electrical parameters: 330 µF, 250 V, ±20% tolerance, 350 mOhm @ 100 Hz ESR, and 3000 Hrs @ 105°C lifetime. Suffix designations reflect manufacturing date codes or internal tracking. Selection among variants does not affect electrical or mechanical performance.

Q: Is the 381LQ331M315J032 suitable as a substitute for 250 V applications?

A: The 381LQ331M315J032 operates at 315 V rated voltage, which exceeds the 250 V requirement of the original part. This higher voltage rating provides additional safety margin and is electrically compatible with 250 V circuit designs. However, physical dimensions differ (25.00 mm diameter, 37.00 mm height versus 25.00 mm diameter, 27.00 mm height). PCB layout verification is required to confirm vertical clearance before implementation.

Q: Why does the LP331M250E3P3 have higher ESR than other substitutes?

A: The LP331M250E3P3 is specified with 750 mOhm @ 120 Hz ESR and 1000 Hrs @ 105°C lifetime, representing a different performance class within the Cornell Dubilier Electronics product portfolio. This part is suitable only for applications where higher ESR and reduced lifetime are acceptable. Physical dimensions also differ significantly (30.00 mm diameter, 30.00 mm height). Substitution requires confirmation that application ripple current and thermal requirements are compatible with these performance characteristics.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed in this reference maintain ROHS3 compliance status, matching the regulatory requirement of the original 381LQ331M250J012. Compliance certification is consistent across Cornell Dubilier Electronics and EPCOS - TDK Electronics product families.

Q: What is the significance of ESR differences between substitutes?

A: ESR (Equivalent Series Resistance) affects ripple current handling capability and thermal performance. The original 381LQ331M250J012 specifies 502 mOhm @ 120 Hz. The B43508 series provides lower ESR (350 mOhm @ 100 Hz), enabling higher ripple current capacity. The LP331M250E3P3 specifies higher ESR (750 mOhm @ 120 Hz), reducing ripple current capacity. Selection must confirm that substitute ESR characteristics are compatible with circuit ripple current requirements.

Q: Can substitutes be used interchangeably in production?

A: Substitutes meeting all primary parameters (capacitance, voltage, tolerance, lead spacing, package type, mounting type) are mechanically and electrically interchangeable. However, physical dimension variations require PCB layout verification. ESR and lifetime rating differences must be evaluated against application ripple current and thermal requirements. Active product status of substitute parts ensures supply continuity for ongoing production.

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