SLPX391M350H3P3 Equivalent & Substitute Parts

Part Overview

The SLPX391M350H3P3 is a 390 µF, 350 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in a radial, can snap-in package. This component is classified as Active product status and is designed for general-purpose applications requiring reliable energy storage and filtering in power supply circuits. The part is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.

Substitute parts are identified when equivalent or upgraded alternatives become necessary due to inventory constraints, design optimization, or application-specific performance requirements while maintaining mechanical and electrical compatibility within the specified parameter ranges.

Substiute Parts

SLPX391M350H3P3

Cornell Dubilier Electronics (CDE)In Stock: 879SLPX391M350H3P3 Datasheet

Current PartRFQ

400MXG390MEFCSN35X30

RubyconIn Stock: 273967400MXG390MEFCSN35X30 Datasheet

UpgradeRFQ

B43634C9397M000

EPCOS - TDK ElectronicsIn Stock: 884B43634C9397M000 Datasheet

UpgradeRFQ

LGN2G391MELC30

NichiconIn Stock: 274093LGN2G391MELC30 Datasheet

UpgradeRFQ

LLS2V391MELC

NichiconIn Stock: 913LLS2V391MELC Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SLPX391M350H3P3 are categorized based on electrical and mechanical compatibility within the following criteria:

Upgrade Substitutes (400 V rated voltage): Parts with identical capacitance (390 µF), tolerance (±20%), and mechanical form factor but with increased voltage rating (400 V) are classified as upgrades. These parts provide enhanced voltage margin and are directly interchangeable in applications where the original 350 V rating is sufficient. Upgrade substitutes include:

• 400MXG390MEFCSN35X30 (Rubycon MXG series)
• B43634C9397M000 (EPCOS - TDK Electronics B43634 series)
• LGN2G391MELC30 (Nichicon LGN series)

Parametric Equivalent (350 V rated voltage): Parts with identical electrical specifications and mechanical dimensions are classified as parametric equivalents. These parts maintain the original voltage rating and are direct replacements:

• LLS2V391MELC (Nichicon LLS series)

All substitute parts maintain the following compatibility requirements:

• Capacitance: 390 µF (exact match)
• Tolerance: ±20% (exact match)
• Package: Radial, Can - Snap-In (exact match)
• Lead Spacing: 0.394" (10.00 mm) (exact match)
• Size / Dimension: 1.378" Dia (35.00 mm) (exact match)
• Height - Seated (Max): 1.260" (32.00 mm) (exact match)
• Mounting Type: Through Hole (exact match)
• Polarization: Polar (exact match)
• RoHS Status: ROHS3 Compliant (exact match)

Parameter Comparison

Engineering Selection Recommendations

All identified substitute parts maintain Active product status and full ROHS3 compliance with REACH unaffected designation, ensuring regulatory alignment with the original SLPX391M350H3P3 component.

For direct replacement with identical electrical specifications: The LLS2V391MELC (Nichicon LLS series) is a parametric equivalent maintaining the original 350 V voltage rating, 3000 hour lifetime at 85°C, and identical mechanical form factor. This part is suitable for applications where the original voltage specification is a design requirement.

For applications permitting voltage upgrade: The 400MXG390MEFCSN35X30 (Rubycon MXG series), B43634C9397M000 (EPCOS - TDK Electronics B43634 series), and LGN2G391MELC30 (Nichicon LGN series) provide 400 V rated voltage with identical capacitance and mechanical compatibility. These upgrades are suitable for circuits designed to operate at or below 350 V, as the higher voltage rating provides additional safety margin without affecting circuit operation.

The B43634C9397M000 offers extended lifetime performance with 8000 hours at 85°C compared to the original 3000 hours, providing enhanced reliability in applications with continuous operation at elevated temperatures.

The 400MXG390MEFCSN35X30 and LGN2G391MELC30 both support extended operating temperature range to 105°C with 3000 hour lifetime at that temperature, enabling deployment in higher ambient temperature environments.

All substitute parts are available in production quantities with confirmed inventory status.

Frequently Asked Questions (FAQ)

Q: Can the 400 V rated substitute parts be used in place of the original 350 V part?

A: Yes. The 400MXG390MEFCSN35X30, B43634C9397M000, and LGN2G391MELC30 are rated for 400 V and are electrically compatible with circuits designed for 350 V operation. The higher voltage rating provides additional voltage margin and does not affect circuit function. All three parts maintain identical capacitance (390 µF), tolerance (±20%), and mechanical form factor.

Q: Are all substitute parts mechanically interchangeable?

A: Yes. All substitute parts share identical mechanical specifications: 1.378" diameter (35.00 mm), 1.260" maximum seated height (32.00 mm), 0.394" lead spacing (10.00 mm), radial can snap-in package, and through-hole mounting type. Direct PCB substitution is possible without layout modification.

Q: What is the difference between the upgrade substitutes and the parametric equivalent?

A: The LLS2V391MELC is a parametric equivalent with identical 350 V voltage rating to the original SLPX391M350H3P3. The three upgrade substitutes (400MXG390MEFCSN35X30, B43634C9397M000, and LGN2G391MELC30) feature 400 V voltage rating, providing higher voltage margin while maintaining all other electrical and mechanical specifications.

Q: Do all substitute parts meet the same regulatory compliance standards?

A: Yes. All substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory status of the original SLPX391M350H3P3. All parts maintain Active product status.

Q: Which substitute part offers the longest operational lifetime?

A: The B43634C9397M000 (EPCOS - TDK Electronics) provides 8000 hours lifetime at 85°C, compared to 3000 hours for the original part and the LLS2V391MELC parametric equivalent. The 400MXG390MEFCSN35X30 and LGN2G391MELC30 provide 3000 hours at the elevated temperature of 105°C, enabling operation in higher ambient temperature environments.

Q: Are there differences in ripple current handling between the substitute parts?

A: Yes. The original SLPX391M350H3P3 specifies 2.3 A at 120 Hz low frequency and 3.38 A at 20 kHz high frequency. The LLS2V391MELC maintains similar ripple current specifications (2.3 A @ 120 Hz, 3.289 A @ 50 kHz). The upgrade substitutes specify lower ripple current values: 400MXG390MEFCSN35X30 (1.6 A @ 120 Hz, 2.24 A @ 10 kHz), B43634C9397M000 (2.22 A @ 100 Hz), and LGN2G391MELC30 (1.55 A @ 120 Hz, 2.2165 A @ 50 kHz). Application ripple current requirements must be evaluated against these specifications.

Q: Can the substitute parts be used in high-temperature applications?

A: The 400MXG390MEFCSN35X30 and LGN2G391MELC30 support extended operating temperature to 105°C with 3000 hour lifetime at that temperature. The original SLPX391M350H3P3 and LLS2V391MELC are rated to 85°C maximum. The B43634C9397M000 is also rated to 85°C maximum but offers extended lifetime (8000 hours) at that temperature.

Q: What is the ESR (Equivalent Series Resistance) specification for the substitute parts?

A: The original SLPX391M350H3P3 specifies 510 mOhm at 120 Hz. The B43634C9397M000 specifies 300 mOhm at 100 Hz, providing lower ESR performance. The 400MXG390MEFCSN35X30, LGN2G391MELC30, and LLS2V391MELC do not provide ESR specifications in the available data.