381LX331M315K032 Equivalent & Substitute Parts

Part Overview

The 381LX331M315K032 is a 330 µF, 315 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in a radial, can snap-in package. This component is rated for general-purpose applications with a 3000-hour lifetime at 105°C and operates across a temperature range of -40°C to 105°C. The part maintains Active product status and is ROHS3 compliant.

Substitute parts are identified when equivalent capacitance and tolerance values are maintained while operating parameters such as voltage rating, lifetime, or ripple current specifications differ within acceptable engineering margins. Identifying suitable alternatives ensures design flexibility, supply chain continuity, and access to components with enhanced performance characteristics.

Substiute Parts

381LX331M315K032

Cornell Dubilier Electronics (CDE)In Stock: 958381LX331M315K032 Datasheet

Current PartRFQ

B43644B9337M000

EPCOS - TDK ElectronicsIn Stock: 1308B43644B9337M000 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 381LX331M315K032 is determined by the following criteria:

Primary Matching Parameters:

• Capacitance value: 330 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Polarization: Polar (exact match required)
• Package / Case: Radial, Can - Snap-In (exact match required)
• Mounting Type: Through Hole (exact match required)
• Lead Spacing: 10.00 mm (exact match required)
• Physical Dimensions: 30.00 mm diameter, 37.00 mm height (exact match required)

Secondary Allowable Variations:

• Voltage Rating: Substitute parts with equal or higher voltage ratings are acceptable, as they provide equivalent or superior electrical stress margin
• Lifetime @ Temperature: Substitute parts with equal or longer lifetime ratings are acceptable
• Operating Temperature Range: Must encompass or match the original specification
• Ripple Current: Substitute parts with equal or higher ripple current ratings are acceptable
• ESR and Impedance: Lower values indicate improved performance characteristics

The B43644B9337M000 substitute meets all primary matching parameters and provides enhanced secondary specifications.

Parameter Comparison

Engineering Selection Recommendations

381LX331M315K032 (Main Part): The 381LX331M315K032 is suitable for applications requiring a 330 µF capacitor at 315 V with standard general-purpose performance. This part is Active, ROHS3 compliant, and REACH unaffected, meeting current regulatory requirements. Selection is appropriate when the 3000-hour lifetime at 105°C and specified ripple current ratings satisfy application demands.

B43644B9337M000 (Substitute Part): The B43644B9337M000 is suitable as a direct substitute when enhanced performance characteristics are beneficial or required. This part maintains identical physical dimensions, lead spacing, and mounting configuration, ensuring PCB compatibility without redesign. The substitute provides a 400 V voltage rating (27% higher than the main part), 5000-hour lifetime at 105°C (67% longer than the main part), and higher ripple current capability. Both parts are Active, ROHS3 compliant, and REACH unaffected.

Selection between these parts depends on application voltage stress margins, expected operational lifetime requirements, and thermal ripple current demands. The substitute part is electrically and mechanically interchangeable with the main part in through-hole snap-in mounting configurations.

Frequently Asked Questions (FAQ)

Q: Can the B43644B9337M000 be used as a direct replacement for the 381LX331M315K032?

A: Yes. Both parts share identical capacitance (330 µF), tolerance (±20%), physical dimensions (30.00 mm diameter, 37.00 mm height), lead spacing (10.00 mm), and mounting type (through-hole radial snap-in). The substitute is electrically and mechanically interchangeable without PCB modification.

Q: What is the primary difference between these two parts?

A: The B43644B9337M000 has a higher voltage rating (400 V versus 315 V) and longer lifetime rating (5000 hours versus 3000 hours at 105°C). Both differences represent performance enhancements that do not affect compatibility.

Q: Are there any compliance or regulatory differences between these parts?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry the same ECCN and HTSUS classifications.

Q: Does the higher voltage rating of the substitute part affect circuit operation?

A: No. A higher voltage rating indicates greater electrical stress margin and does not alter the capacitor's functional behavior in the circuit. The capacitance value, tolerance, and operating temperature range remain identical.

Q: Can the main part be used in applications designed for the substitute part?

A: The main part can be used if the application voltage does not exceed 315 V and the 3000-hour lifetime at 105°C is sufficient. If the application requires 400 V operation or longer operational life, the substitute part is required.

Q: Are the physical footprints identical for PCB mounting?

A: Yes. Both parts have identical lead spacing (10.00 mm), diameter (30.00 mm), and height (37.00 mm), ensuring identical PCB footprints and mounting hole patterns.

Q: What is the ripple current difference between these parts?

A: The main part is rated for 1.2 A at 120 Hz. The substitute part is rated for 1.49 A at 100 Hz. The substitute provides higher ripple current capability, indicating improved thermal performance under AC stress conditions.