381EL331M250J032 Equivalent & Substitute Parts Reference

Part Overview

The 381EL331M250J032 is a 330 µF, 250 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in a radial, can snap-in package. This component is classified as Obsolete and is no longer in active production. The part features a 7000-hour lifetime rating at 105°C and is designed for general-purpose applications requiring through-hole mounting.

Due to its obsolete status, equivalent substitute parts from active product lines are necessary for new designs, repairs, and ongoing system support. The substitute parts listed maintain the core electrical specifications (330 µF capacitance, 250 V rated voltage, ±20% tolerance) while offering varying performance characteristics in lifetime, ESR, and ripple current ratings.

Substiute Parts

381EL331M250J032

Cornell Dubilier Electronics (CDE)In Stock: 685381EL331M250J032 Datasheet

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381LQ331M250H022

Cornell Dubilier Electronics (CDE)In Stock: 85806381LQ331M250H022 Datasheet

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381LR331M250J022

Cornell Dubilier Electronics (CDE)In Stock: 1158381LR331M250J022 Datasheet

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381LX331M250J022

Cornell Dubilier Electronics (CDE)In Stock: 902381LX331M250J022 Datasheet

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LP331M250E3P3

Cornell Dubilier Electronics (CDE)In Stock: 931LP331M250E3P3 Datasheet

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B43504C2337M000

EPCOS - TDK ElectronicsIn Stock: 1337B43504C2337M000 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 381EL331M250J032 is determined by strict adherence to the following core parameters:

Mandatory Matching Parameters:

• Capacitance: 330 µF (exact)
• Voltage Rating: 250 V (exact)
• Tolerance: ±20% (exact)
• Package Type: Radial, Can - Snap-In (exact)
• Mounting Type: Through Hole (exact)
• Lead Spacing: 10.00 mm (exact)
• Operating Temperature Range: -40°C to 105°C (minimum requirement)
• Polarization: Polar (exact)

Variable Parameters (Allowed to Differ):

• ESR (Equivalent Series Resistance): May vary within acceptable limits for the application
• Lifetime @ 105°C: May be lower or higher than original specification
• Ripple Current ratings: May vary based on ESR and lifetime differences
• Physical dimensions (diameter, height): Minor variations permitted within mechanical compatibility constraints
• Product Status: Active products preferred over obsolete or not-for-new-designs status

All substitute parts listed below satisfy the mandatory matching parameters and are compatible with the original 381EL331M250J032 footprint and electrical interface.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: 381LR331M250J022

The 381LR331M250J022 is the preferred substitute for the obsolete 381EL331M250J032. This part maintains identical physical dimensions (25.00 mm diameter, 32.00 mm height), matching lead spacing (10.00 mm), and core electrical specifications. The 381LR series offers an active product status with a 3000-hour lifetime at 105°C. ESR performance (452 mOhm @ 120Hz) is comparable to the original specification (450 mOhm @ 120Hz), and ripple current ratings are equivalent or superior. ROHS3 compliance and unlimited moisture sensitivity rating ensure regulatory and environmental compatibility.

Secondary Recommendation: 381LX331M250J022

The 381LX331M250J022 provides an alternative from the active 381LX product line. Physical dimensions match the original part (25.00 mm diameter, 32.00 mm height). This part offers a 3000-hour lifetime at 105°C and maintains the same lead spacing and mounting configuration. ESR data is not provided for this part number; verification of ESR specifications is necessary if ESR performance is critical to the application.

Alternative for Space-Constrained Applications: 381LQ331M250H022

The 381LQ331M250H022 is suitable for applications where reduced physical footprint is acceptable. This part features a smaller diameter (22.00 mm versus 25.00 mm) and shorter height (32.00 mm), maintaining the same lead spacing. The 2000-hour lifetime at 105°C is lower than the original specification; this part is appropriate only for applications with reduced thermal stress or shorter operational life requirements. ESR is slightly elevated (502 mOhm @ 120Hz).

Not Recommended for New Designs: B43504C2337M000

The B43504C2337M000 (EPCOS - TDK Electronics) carries a "Not For New Designs" product status. While this part meets all mandatory electrical and mechanical parameters with superior ESR performance (390 mOhm @ 100Hz) and a 3000-hour lifetime, its discontinued design status makes it unsuitable for new product development. This part may be considered only for legacy system repairs where exact performance matching is required and new-design restrictions do not apply.

Not Recommended: LP331M250E3P3

The LP331M250E3P3 exhibits significantly reduced performance characteristics. The 1000-hour lifetime at 105°C is substantially lower than the original specification, and ESR is elevated (750 mOhm @ 120Hz). Physical dimensions are also larger (30.00 mm diameter, 30.00 mm height). This part is suitable only for low-stress, short-duration applications and is not recommended as a general substitute.

Frequently Asked Questions (FAQ)

Q1: Can the 381LQ331M250H022 be used as a direct replacement for the 381EL331M250J032 in existing PCB designs?

A: The 381LQ331M250H022 is electrically compatible but has different physical dimensions. The diameter is reduced from 25.00 mm to 22.00 mm, and the height is reduced from 35.00 mm to 32.00 mm. If the PCB layout has tight mechanical constraints or if the snap-in mounting relies on specific can diameter for retention, physical verification is required before substitution. The lead spacing (10.00 mm) remains identical, ensuring electrical connectivity compatibility.

Q2: What is the significance of ESR (Equivalent Series Resistance) when selecting a substitute?

A: ESR directly affects capacitor performance in ripple current applications and thermal stability. Lower ESR values result in reduced heat generation and improved high-frequency performance. The original 381EL331M250J032 specifies 450 mOhm @ 120Hz. Substitute parts with comparable ESR values (381LR at 452 mOhm, B43504 at 390 mOhm) maintain similar thermal and frequency response characteristics. Parts with significantly higher ESR (LP series at 750 mOhm) generate more heat and are suitable only for low-ripple-current applications.

Q3: Why does the 381LX331M250J022 not list an ESR specification?

A: The provided data for the 381LX331M250J022 does not include an ESR value. This represents incomplete technical documentation in the source data. Before selecting this part for applications where ESR performance is critical, the manufacturer's complete datasheet must be consulted to obtain the missing ESR specification at the relevant frequency (120Hz or 100Hz).

Q4: Is the B43504C2337M000 suitable for new product designs?

A: No. The B43504C2337M000 carries a "Not For New Designs" product status designation. This status indicates that EPCOS - TDK Electronics has discontinued active support and development for this part. While the part may be available in inventory, it is not recommended for incorporation into new designs. This part is appropriate only for legacy system repairs, field replacements in existing products, or applications where design restrictions do not apply.

Q5: What is the impact of reduced lifetime rating on substitute part selection?

A: Lifetime rating (measured in hours at 105°C) indicates the expected operational duration before capacitor degradation becomes significant. The original 381EL331M250J032 specifies 7000 hours at 105°C. Substitute parts with lower lifetime ratings (381LQ at 2000 hours, LP at 1000 hours) are suitable only for applications with lower thermal stress, shorter operational life requirements, or non-critical functions. For long-life applications or high-reliability systems, parts with lifetime ratings of 3000 hours or higher (381LR, 381LX, B43504) are preferred.

Q6: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (381LQ331M250H022, 381LR331M250J022, 381LX331M250J022, LP331M250E3P3, and B43504C2337M000) are ROHS3 compliant. This ensures compatibility with environmental regulations and procurement requirements for RoHS-restricted applications. The original 381EL331M250J032 is also ROHS3 compliant.

Q7: What is the difference between lead spacing and physical diameter in terms of PCB compatibility?

A: Lead spacing (10.00 mm for all parts listed) determines the distance between the two radial leads and directly affects PCB hole pattern compatibility. All substitute parts maintain identical 10.00 mm lead spacing, ensuring that PCB footprints designed for the original part will accept any substitute without modification. Physical diameter (ranging from 22.00 mm to 30.00 mm across the substitute list) affects the can size and mechanical clearance requirements. Reduced diameter parts (381LQ at 22.00 mm) fit in tighter spaces but may not provide adequate mechanical retention if the original design relied on a specific can diameter for snap-in mounting.

Q8: Which substitute part offers the best overall performance match to the original 381EL331M250J032?

A: The 381LR331M250J022 provides the closest overall performance match. It maintains identical physical dimensions (25.00 mm diameter), comparable ESR (452 mOhm versus 450 mOhm), and a 3000-hour lifetime at 105°C. While the original part specifies 7000 hours, the 381LR represents the best balance of performance, availability, active product status, and mechanical compatibility. For applications requiring extended lifetime performance, the 381LX331M250J022 also offers 3000-hour rating with identical physical dimensions.