LPX331M400H3P3 Equivalent & Substitute Parts

Part Overview

The LPX331M400H3P3 is a 330 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. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity when the primary part becomes unavailable or when alternative specifications better suit application requirements.

Substiute Parts

LPX331M400H3P3

Cornell Dubilier Electronics (CDE)In Stock: 1116LPX331M400H3P3 Datasheet

Current PartRFQ

LPX331M400E7P3

Cornell Dubilier Electronics (CDE)In Stock: 2157LPX331M400E7P3 Datasheet

SimilarRFQ

ALC10A331DC400

KEMETIn Stock: 1237ALC10A331DC400 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LPX331M400H3P3 is determined by the following critical parameters:

Mandatory Matching Parameters:

• Capacitance: 330 µF (exact match required)
• Voltage Rating: 400 V (exact match required)
• Tolerance: ±20% (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)
• Operating Temperature Range: -40°C to 85°C (minimum requirement)
• Polarization: Polar (exact match required)

Allowable Variation Parameters:

• ESR (Equivalent Series Resistance): May vary within acceptable limits for the application
• Lifetime @ Temperature: May exceed the original specification
• Ripple Current Ratings: May exceed the original specification
• Physical Dimensions (diameter and height): May vary within PCB layout constraints
• Manufacturer: Different manufacturers acceptable if all mandatory parameters match

All substitute parts listed meet these criteria and are confirmed as direct functional equivalents for the LPX331M400H3P3.

Parameter Comparison

Engineering Selection Recommendations

All three parts listed—LPX331M400H3P3, LPX331M400E7P3, and ALC10A331DC400—meet the mandatory electrical and mechanical substitution criteria. Selection between these parts is based on the following factors:

LPX331M400H3P3 (Primary Part): This is the original specified part. It maintains all baseline electrical characteristics and is suitable for applications where the original design parameters are required. Active production status and full compliance certifications support continued use.

LPX331M400E7P3 (CDE Alternative): This part is electrically identical to the primary part with matching ESR and lifetime specifications. The primary difference is physical dimension variation: smaller diameter (30.00 mm vs. 35.00 mm) but greater height (40.00 mm vs. 30.00 mm). This substitute is appropriate when PCB layout accommodates the increased height and reduced diameter. Higher inventory availability (2134 pcs) may support procurement timelines. Bulk packaging is standard.

ALC10A331DC400 (KEMET Alternative): This part offers superior performance characteristics: lower ESR (461 mOhm vs. 603 mOhm), extended lifetime (15000 Hrs vs. 1000 Hrs @ 85°C), and higher ripple current ratings across frequency ranges. Physical dimensions are comparable to the primary part (35.00 mm diameter, 37.00 mm height). This substitute is appropriate for applications requiring enhanced reliability or extended operational life. All compliance certifications are met.

All three parts are RoHS3 compliant, REACH unaffected, and carry active product status. Selection should be based on PCB layout constraints and application reliability requirements.

Frequently Asked Questions (FAQ)

Q: Can LPX331M400E7P3 be used as a direct replacement for LPX331M400H3P3?

A: LPX331M400E7P3 is electrically equivalent with identical capacitance, voltage, tolerance, and ESR specifications. However, physical dimensions differ: the substitute has a smaller diameter (30.00 mm vs. 35.00 mm) but greater height (40.00 mm vs. 30.00 mm). PCB layout must accommodate these dimensional changes. Lead spacing remains identical at 10.00 mm.

Q: What are the key differences between the CDE LPX series parts and the KEMET ALC10A331DC400?

A: Both manufacturers provide 330 µF, 400 V snap-in capacitors with identical electrical ratings. The KEMET part offers lower ESR (461 mOhm vs. 603 mOhm) and significantly extended lifetime (15000 Hrs vs. 1000 Hrs @ 85°C). Physical dimensions are similar, with the KEMET part at 35.00 mm diameter and 37.00 mm height compared to the primary part's 35.00 mm diameter and 30.00 mm height.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. LPX331M400H3P3, LPX331M400E7P3, and ALC10A331DC400 are all RoHS3 compliant and REACH unaffected. All parts meet current environmental and regulatory requirements.

Q: What is the significance of the 1000 Hrs @ 85°C lifetime specification?

A: This specification indicates the capacitor's expected operational life under rated conditions at 85°C ambient temperature. The ALC10A331DC400 provides 15000 Hrs @ 85°C, representing a 15-fold extension in rated lifetime. Applications requiring extended operational life or higher reliability margins should consider this specification.

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

A: Electrical interchangeability is confirmed for all three parts. However, physical dimensions must be verified against PCB layout constraints. The LPX331M400E7P3 has different height and diameter than the primary part. The ALC10A331DC400 has comparable dimensions to the primary part. Lead spacing is identical (10.00 mm) for all parts.

Q: What is the difference between ESR measured at 120 Hz versus 100 Hz?

A: ESR varies with frequency. The primary part specifies 603 mOhm @ 120 Hz, while the KEMET part specifies 461 mOhm @ 100 Hz. These measurements are taken at different frequencies, making direct comparison approximate. The KEMET part demonstrates lower impedance characteristics across its measurement frequency.

Q: Are all parts available in the same packaging format?

A: All three parts use Radial, Can - Snap-In package type with through-hole mounting. Lead spacing is 10.00 mm for all parts. Packaging designation differs (the primary part lists "-" while substitutes list "Bulk"), but the physical package format is identical.