381LR121M400H032 Equivalent & Substitute Parts Reference

Part Overview

The 381LR121M400H032 is a 120 µF, 400 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 stable capacitance and extended operational life at elevated temperatures. The part operates across a temperature range of -25°C to 105°C with a rated lifetime of 3000 hours at 105°C.

Equivalent and substitute parts are identified to address inventory availability, supply chain continuity, and application-specific performance requirements while maintaining compatibility with the original design specifications.

Substiute Parts

381LR121M400H032

Cornell Dubilier Electronics (CDE)In Stock: 892381LR121M400H032 Datasheet

Current PartRFQ

381LX121M450H032

Cornell Dubilier Electronics (CDE)In Stock: 1072381LX121M450H032 Datasheet

UpgradeRFQ

400HXG120MEFCSN22X30

RubyconIn Stock: 1270400HXG120MEFCSN22X30 Datasheet

DirectRFQ

LGU2G121MELZ

NichiconIn Stock: 1105LGU2G121MELZ Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 381LR121M400H032 are classified based on the following substitution criteria:

Primary Substitution Parameters:

• Capacitance: 120 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Voltage Rating: 400 V or higher (equal or greater voltage acceptable)
• Operating Temperature: -25°C to 105°C (exact match required)
• Lifetime: 3000 Hrs @ 105°C (exact match required)
• Package Type: Radial, Can - Snap-In (exact match required)
• Mounting Type: Through Hole (exact match required)
• Lead Spacing: 0.394" / 10.00 mm (exact match required)
• Case Diameter: 0.866" / 22.00 mm (exact match required)
• Polarization: Polar (exact match required)
• Compliance: ROHS3 Compliant, REACH Unaffected (exact match required)

Substitution Categories:

Upgrade Substitute: 381LX121M450H032 (Cornell Dubilier Electronics) - Rated voltage increased to 450 V while maintaining all other specifications. Suitable for applications requiring higher voltage margin.

Direct Substitute: 400HXG120MEFCSN22X30 (Rubycon) - Identical electrical and mechanical specifications with equivalent voltage rating of 400 V. Maintains same package footprint and performance characteristics.

Similar Substitute: LGU2G121MELZ (Nichicon) - Meets all primary substitution parameters with minor height variation (1.378" vs. 1.457"). Acceptable for applications with flexible vertical clearance.

Parameter Comparison

Engineering Selection Recommendations

381LR121M400H032 (Cornell Dubilier Electronics - Primary Part)

Selection is appropriate for applications requiring the exact specifications of a 120 µF, 400 V aluminum electrolytic capacitor with snap-in mounting. Active product status ensures continued availability and manufacturing support. ROHS3 compliance and REACH unaffected status satisfy regulatory requirements for industrial and commercial applications.

381LX121M450H032 (Cornell Dubilier Electronics - Upgrade Substitute)

This substitute is suitable when higher voltage margin is required. The 450 V rating provides increased safety factor in applications subject to voltage transients or overvoltage conditions. Identical mechanical footprint and thermal characteristics ensure direct board-level compatibility. Maintains same manufacturer lineage, supporting supply chain consistency.

400HXG120MEFCSN22X30 (Rubycon - Direct Substitute)

This part provides equivalent electrical performance with identical voltage rating of 400 V. Mechanical compatibility is confirmed through matching lead spacing, case diameter, and package type. Reduced height (1.260" vs. 1.457") offers advantage in space-constrained applications. Active product status and full compliance certifications support long-term availability.

LGU2G121MELZ (Nichicon - Similar Substitute)

This substitute meets all critical electrical parameters with minor height variation of 1.378" (35.00 mm). Acceptable for applications with flexible vertical clearance requirements. Moisture Sensitivity Level classification differs (Not Applicable vs. Level 1), indicating alternative material composition. Active product status and compliance certifications support deployment in regulated environments.

Frequently Asked Questions (FAQ)

Q: Can the 381LX121M450H032 be used as a direct replacement for the 381LR121M400H032?

A: Yes. The 381LX121M450H032 is a direct substitute with identical capacitance, tolerance, operating temperature range, and mechanical dimensions. The increased voltage rating of 450 V (versus 400 V) is compatible with 400 V circuit designs and provides additional voltage margin. All other electrical and mechanical parameters remain equivalent.

Q: What is the primary difference between the Rubycon 400HXG120MEFCSN22X30 and the original CDE 381LR121M400H032?

A: Both parts share identical electrical specifications (120 µF, 400 V, ±20% tolerance) and mechanical compatibility (lead spacing, case diameter, package type). The primary difference is manufacturer and a reduced seated height of 1.260" compared to 1.457". This height reduction may be advantageous in applications with vertical space constraints.

Q: Is the Nichicon LGU2G121MELZ compatible with the 381LR121M400H032 in all applications?

A: The LGU2G121MELZ meets all critical electrical parameters and maintains mechanical compatibility through matching lead spacing, case diameter, and package type. The seated height is 1.378", which is intermediate between the original part and the Rubycon substitute. Moisture Sensitivity Level classification differs, indicating different material composition. Compatibility depends on application-specific requirements for moisture sensitivity and vertical clearance.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (381LX121M450H032, 400HXG120MEFCSN22X30, and LGU2G121MELZ) are ROHS3 compliant and REACH unaffected, meeting regulatory requirements for industrial and commercial deployment.

Q: What is the significance of the ±20% tolerance specification?

A: The ±20% tolerance indicates that actual capacitance values may range from 96 µF to 144 µF. All substitute parts maintain this identical tolerance specification, ensuring equivalent performance characteristics in circuit applications where this tolerance band is acceptable.

Q: Can these substitutes be used interchangeably on the same printed circuit board?

A: Yes, with consideration for physical clearance. All substitutes maintain identical lead spacing (0.394" / 10.00 mm) and case diameter (0.866" / 22.00 mm), ensuring PCB footprint compatibility. Height variations (ranging from 1.260" to 1.457") must be evaluated against available vertical clearance in the assembly.

Q: What is the operational lifetime specification, and how does it apply to substitute selection?

A: All parts, including substitutes, are rated for 3000 hours of operation at 105°C. This specification defines the expected service life under maximum temperature conditions. Equivalent lifetime ratings across all substitutes ensure consistent reliability and maintenance planning.