LPX121M400A3P3 Equivalent & Substitute Parts

Part Overview

The LPX121M400A3P3 is a 120 µF, 400 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in the LPX series. This radial, can-style snap-in capacitor is designed for general-purpose applications requiring through-hole mounting. The part is currently active in production with full RoHS3 compliance and REACH unaffected status. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when inventory constraints require component alternatives that meet equivalent electrical and mechanical specifications.

Substiute Parts

LPX121M400A3P3

Cornell Dubilier Electronics (CDE)In Stock: 1038LPX121M400A3P3 Datasheet

Current PartRFQ

B43642A9127M000

EPCOS - TDK ElectronicsIn Stock: 1708B43642A9127M000 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LPX121M400A3P3 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

• Capacitance value: 120 µF (exact match)
• Voltage rating: 400 V (exact match)
• Tolerance: ±20% (exact match)
• Polarization: Polar (exact match)

Mechanical Equivalence Requirements:

• Package type: Radial, Can - Snap-In (exact match)
• Mounting type: Through Hole (exact match)
• Lead spacing: 0.394" (10.00mm) (exact match)
• Diameter: 0.866" (22.00mm) (exact match)

Compliance Requirements:

• RoHS3 Compliant status (exact match)
• REACH Unaffected status (exact match)

The substitute part B43642A9127M000 meets all critical electrical and mechanical parameters, enabling direct functional replacement in applications where the LPX121M400A3P3 is specified.

Parameter Comparison

Engineering Selection Recommendations

Both the LPX121M400A3P3 and B43642A9127M000 are active production parts with full RoHS3 compliance and REACH unaffected status, qualifying them for use in regulated applications. The parts are electrically and mechanically equivalent across all critical parameters: capacitance, voltage rating, tolerance, polarization, lead spacing, and package configuration.

The B43642A9127M000 substitute demonstrates superior performance characteristics in ESR (0.830 Ohm versus 1.658 Ohm) and extended thermal lifetime rating (3000 Hrs @ 105°C versus 1000 Hrs @ 85°C). The substitute part also features an extended operating temperature range (-40°C ~ 105°C versus -40°C ~ 85°C) and a reduced seated height (1.063" versus 1.181"), which may provide advantages in space-constrained applications.

Selection between these parts is based on availability, inventory status, and application-specific performance requirements. Both parts satisfy the core electrical and mechanical requirements for direct substitution in general-purpose applications.

Frequently Asked Questions (FAQ)

Q: Can the B43642A9127M000 be used as a direct replacement for the LPX121M400A3P3?

A: Yes. Both parts share identical capacitance (120 µF), voltage rating (400 V), tolerance (±20%), polarization (Polar), lead spacing (10.00mm), diameter (22.00mm), package type (Radial, Can - Snap-In), and mounting configuration (Through Hole). Both are RoHS3 compliant and REACH unaffected.

Q: What are the physical differences between these parts?

A: The primary physical difference is seated height. The LPX121M400A3P3 has a maximum seated height of 1.181" (30.00mm), while the B43642A9127M000 has a maximum seated height of 1.063" (27.00mm). Both share the same diameter (0.866" / 22.00mm) and lead spacing (0.394" / 10.00mm), ensuring compatibility with standard PCB layouts designed for either part.

Q: Are there electrical performance differences?

A: The B43642A9127M000 exhibits lower equivalent series resistance (0.830 Ohm @ 100 Hz) compared to the LPX121M400A3P3 (1.658 Ohm @ 120 Hz). The substitute part also carries a higher thermal lifetime rating (3000 Hrs @ 105°C versus 1000 Hrs @ 85°C) and an extended operating temperature range (-40°C ~ 105°C versus -40°C ~ 85°C).

Q: Do both parts meet regulatory requirements?

A: Yes. Both the LPX121M400A3P3 and B43642A9127M000 are RoHS3 compliant and REACH unaffected, meeting current regulatory standards for electronic components in regulated markets.

Q: What is the lead spacing for both parts?

A: Both parts have identical lead spacing of 0.394" (10.00mm), ensuring compatibility with PCB designs that accommodate either component without modification.

Q: Can these parts be used interchangeably in existing designs?

A: Yes, provided the PCB layout accommodates the height difference. The B43642A9127M000 is 0.118" (3.00mm) shorter than the LPX121M400A3P3. In applications where vertical clearance is not constrained, both parts are functionally interchangeable. In space-limited designs, the shorter substitute may offer an advantage.