381LX331M315K042 Aluminum Electrolytic Capacitor - Equivalent & Substitute Parts

Part Overview

The 381LX331M315K042 is a 330 µF, 315 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in a radial, can-style snap-in package. This through-hole component is designed for general purpose applications with a rated lifetime of 3000 hours at 105°C and an operating temperature range of -40°C to 105°C. The component remains in active product status and is ROHS3 compliant. Substitute parts are necessary to address application requirements such as higher voltage ratings, improved ESR characteristics, or extended operational lifetime specifications.

Substiute Parts

381LX331M315K042

Cornell Dubilier Electronics (CDE)In Stock: 887381LX331M315K042 Datasheet

Current PartRFQ

B43508B5337M000

EPCOS - TDK ElectronicsIn Stock: 139341B43508B5337M000 Datasheet

UpgradeRFQ

B43644A5337M000

EPCOS - TDK ElectronicsIn Stock: 2807B43644A5337M000 Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Equivalent and substitute parts for the 381LX331M315K042 are selected based on maintained electrical and mechanical compatibility. All substitute candidates maintain the following critical parameters:

• Capacitance: 330 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Lead Spacing: 0.394" (10.00mm) (exact match required)
• Physical Dimensions: 1.181" Dia (30.00mm), 1.654" Height (exact match required)
• Package Type: Radial, Can - Snap-In through-hole mounting
• Operating Temperature Range: -40°C ~ 105°C (exact match required)
• Polarization: Polar

Substitute parts are acceptable when rated voltage exceeds or equals the original specification (315 V minimum) and when mechanical footprint remains identical for printed circuit board compatibility. The candidates presented (B43508B5337M000 and B43644A5337M000) both provide 450 V rated voltage, offering increased design margin while maintaining all dimensional and electrical performance parameters.

Parameter Comparison

Engineering Selection Recommendations

Both EPCOS - TDK Electronics substitute parts meet or exceed the electrical and mechanical requirements of the original 381LX331M315K042 component.

B43508B5337M000 maintains identical lifetime specifications (3000 hours at 105°C) while increasing rated voltage to 450 V. This part provides direct functional equivalence with enhanced voltage margin for applications with transient overvoltage conditions.

B43644A5337M000 extends operational lifetime to 5000 hours at 105°C and further reduces ESR to 90 mOhm at 100 Hz compared to the B43508B5337M000 specification of 370 mOhm. This part is recommended for applications requiring extended operational life or where lower equivalent series resistance is beneficial for ripple current handling and thermal management.

Both substitute parts maintain full ROHS3 compliance and identical mechanical footprint for direct board-level interchange without redesign.

Frequently Asked Questions (FAQ)

Q: Can B43508B5337M000 or B43644A5337M000 be used as direct replacements for 381LX331M315K042?

A: Yes. Both substitute parts maintain identical capacitance (330 µF), tolerance (±20%), operating temperature range (-40°C to 105°C), lead spacing (10.00mm), physical dimensions (30.00mm diameter, 42.00mm height), and package type (radial, can snap-in through-hole). The 450 V rated voltage of each substitute exceeds the original 315 V specification, ensuring compatibility with the original application circuit.

Q: What is the difference between the two substitute options?

A: B43508B5337M000 maintains the same 3000-hour lifetime at 105°C as the original component. B43644A5337M000 extends lifetime to 5000 hours at 105°C and reduces ESR to 90 mOhm compared to 370 mOhm, resulting in lower impedance and improved ripple current capability.

Q: Are there any mechanical compatibility concerns?

A: No. All three parts share identical mechanical specifications: 10.00mm lead spacing, 30.00mm diameter, and 42.00mm maximum seated height. Direct board-level substitution is possible without PCB redesign.

Q: Are both substitute parts ROHS3 compliant?

A: Yes. Both B43508B5337M000 and B43644A5337M000 are ROHS3 compliant and suitable for electronics assembly in RoHS-regulated markets.

Q: Why would I select one substitute over the other?

A: Selection depends on application requirements. If extended operational lifetime beyond 3000 hours is necessary, B43644A5337M000 is the appropriate choice. If lower ESR and reduced impedance characteristics are beneficial for high ripple current applications, B43644A5337M000 offers superior performance. For applications requiring only equivalent electrical performance at matching lifetime, B43508B5337M000 is adequate.