SLPX331M420C9P3 Equivalent & Substitute Parts Reference

Part Overview

The SLPX331M420C9P3 is a 330 µF, 420 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in the SLPX series. This radial, can-style snap-in capacitor is designed for general-purpose applications requiring high voltage energy storage and filtering. The part is Active status and ROHS3 compliant, making it suitable for modern industrial and commercial equipment.

Substitute parts are identified when equivalent capacitance, tolerance, and mechanical form factor are maintained while voltage rating, thermal performance, or manufacturer availability may differ. Identifying qualified substitutes ensures design continuity and supply chain flexibility.

Substiute Parts

SLPX331M420C9P3

Cornell Dubilier Electronics (CDE)In Stock: 926SLPX331M420C9P3 Datasheet

Current PartRFQ

450MXG330MEFCSN25X50

RubyconIn Stock: 273875450MXG330MEFCSN25X50 Datasheet

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ESMM451VSN331MQ50S

Chemi-ConIn Stock: 1319ESMM451VSN331MQ50S Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SLPX331M420C9P3 are qualified based on the following criteria:

Mandatory Matching Parameters:

• Capacitance: 330 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Package / Case: Radial, Can - Snap-In (exact match required)
• Lead Spacing: 0.394" (10.00mm) (exact match required)
• Size / Dimension: 0.984" Dia (25.00mm) (exact match required)
• Height - Seated (Max): 2.047" (52.00mm) (exact match required)
• Mounting Type: Through Hole (exact match required)
• Polarization: Polar (exact match required)

Allowable Variation Parameters:

• Voltage - Rated: Equal to or greater than 420 V
• Operating Temperature: Equal to or greater than the original range
• Lifetime @ Temp.: Equal to or greater than 3000 Hrs
• ESR (Equivalent Series Resistance): Variation permitted within application tolerance
• Ripple Current: Variation permitted within application tolerance

Two substitute parts meet these criteria and are listed below.

Parameter Comparison

Engineering Selection Recommendations

450MXG330MEFCSN25X50 (Rubycon MXG Series)

This substitute provides a voltage rating upgrade from 420 V to 450 V, maintaining identical mechanical dimensions and lead spacing. The extended operating temperature range (-25°C ~ 105°C) and higher temperature lifetime rating (3000 Hrs @ 105°C) offer improved thermal performance. All compliance certifications (ROHS3, REACH Unaffected) are maintained. Product status is Active with substantial inventory availability (273,782 pcs). This part is suitable for applications where higher voltage margin and thermal headroom are beneficial.

ESMM451VSN331MQ50S (Chemi-Con SMM Series)

This substitute also provides a voltage rating upgrade to 450 V with identical lead spacing and height. The operating temperature range matches the original part (-25°C ~ 85°C). ESR specification is provided at 1.005 Ohm @ 120Hz, which is higher than the main part's 603 mOhm. Mechanical dimensions show a minor diameter variation (1.000" vs. 0.984"), which remains within snap-in form factor compatibility. Product status is Active with RoHS compliance. This part is suitable for applications where ESR specification transparency is required.

Both substitutes maintain Active product status, ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can SLPX331M420C9P3 be directly replaced with 450MXG330MEFCSN25X50?

A: Yes. Both parts share identical capacitance (330 µF), tolerance (±20%), package type (Radial, Can - Snap-In), lead spacing (10.00mm), and mounting dimensions. The substitute features a higher voltage rating (450 V vs. 420 V) and extended temperature performance, making it electrically and mechanically compatible.

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

A: Both substitutes maintain the core electrical and mechanical specifications. The primary differences are: (1) Rubycon 450MXG330MEFCSN25X50 offers extended operating temperature range to 105°C with lifetime rating at 105°C; (2) Chemi-Con ESMM451VSN331MQ50S provides explicit ESR specification (1.005 Ohm @ 120Hz) and has a minor diameter variation (1.000" vs. 0.984"). Both are electrically qualified substitutes.

Q: Are there any mechanical compatibility concerns with the Chemi-Con substitute?

A: The Chemi-Con ESMM451VSN331MQ50S has a diameter of 1.000" (25.40mm) compared to the original 0.984" (25.00mm). This 0.40mm difference remains within snap-in form factor tolerance and does not affect lead spacing (10.00mm) or height (52.00mm). Mechanical compatibility is maintained for standard through-hole snap-in mounting.

Q: Do all substitute parts meet RoHS compliance?

A: Yes. The Rubycon 450MXG330MEFCSN25X50 is ROHS3 Compliant. The Chemi-Con ESMM451VSN331MQ50S is RoHS Compliant. Both meet regulatory requirements for modern applications.

Q: What is the voltage derating consideration when using a 450 V substitute in a 420 V application?

A: The 450 V rated substitutes provide a 30 V margin above the original 420 V specification. This additional voltage rating does not affect performance in 420 V applications and provides design margin for transient overvoltage conditions.

Q: Are all parts in Active product status?

A: Yes. The main part SLPX331M420C9P3 and both substitutes (450MXG330MEFCSN25X50 and ESMM451VSN331MQ50S) are all Active status, ensuring continued availability and manufacturer support.