SK4R7M350ST Equivalent & Substitute Parts

Part Overview

The SK4R7M350ST is a 4.7 µF, 350 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in a radial, through-hole configuration. This component is classified as Active and is suitable for general-purpose applications requiring polarized capacitive storage at moderate voltage levels. The part features a 2000-hour lifetime rating at 85°C and operates across a temperature range of -25°C to 85°C.

Substitute parts are necessary when the original SK4R7M350ST becomes unavailable, when design requirements demand enhanced performance characteristics such as extended lifetime or higher voltage ratings, or when alternative manufacturers' components offer superior reliability metrics for specific application environments.

Substiute Parts

SK4R7M350ST

Cornell Dubilier Electronics (CDE)In Stock: 1008SK4R7M350ST Datasheet

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400LLE4R7MEFC10X12.5

RubyconIn Stock: 44118400LLE4R7MEFC10X12.5 Datasheet

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400LEX4.7MEFC10X12.5

RubyconIn Stock: 2284400LEX4.7MEFC10X12.5 Datasheet

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450PK4R7MEFC10X12.5

RubyconIn Stock: 1303450PK4R7MEFC10X12.5 Datasheet

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ULD2G4R7MPD

NichiconIn Stock: 2806ULD2G4R7MPD Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SK4R7M350ST is determined by the following critical parameters:

Mandatory Matching Parameters:

• Capacitance: 4.7 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Polarization: Polar (exact match required)
• Lead Spacing: 0.197" (5.00mm) (exact match required)
• Size / Dimension: 0.394" Dia (10.00mm) (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: Radial, Can (exact match required)

Allowable Variation Parameters:

• Voltage - Rated: Equal to or greater than 350 V (uprating permitted)
• Operating Temperature: Equal to or greater than the original range (expansion permitted)
• Lifetime @ Temp.: May vary based on temperature rating and manufacturer design
• ESR (Equivalent Series Resistance): May vary within acceptable limits for general-purpose applications
• Ripple Current: May vary based on voltage and thermal ratings

All substitute parts listed maintain identical physical dimensions, lead spacing, and mounting characteristics, ensuring direct mechanical and electrical compatibility within the specified parameter tolerances.

Parameter Comparison

Engineering Selection Recommendations

400LLE4R7MEFC10X12.5 (Rubycon LLE Series)

This substitute provides a 50 V voltage uprating (400 V vs. 350 V) with extended lifetime characteristics of 15000 hours at 105°C. The expanded operating temperature range (-40°C to 105°C) accommodates broader environmental conditions. This part is classified as Active and maintains full ROHS3 compliance. Selection is appropriate for applications requiring enhanced thermal stability and extended service life within the same physical footprint.

400LEX4.7MEFC10X12.5 (Rubycon LEX Series)

This substitute offers a 50 V voltage uprating with the highest operating temperature ceiling of 125°C. The LEX series provides 5000-hour lifetime at 125°C, supporting high-temperature application environments. This part is classified as Active with full ROHS3 compliance. Selection is appropriate for applications subject to elevated ambient temperatures or thermal cycling conditions.

450PK4R7MEFC10X12.5 (Rubycon PK Series)

This substitute provides a 100 V voltage uprating (450 V vs. 350 V) with identical thermal characteristics to the original part (2000 hours at 85°C). The operating temperature range matches the original specification (-25°C to 85°C). This part is classified as Active with full ROHS3 compliance. Selection is appropriate for applications requiring enhanced voltage margin without thermal performance modification.

ULD2G4R7MPD (Nichicon ULD Series)

This substitute provides a 50 V voltage uprating with extended lifetime of 15000 hours at 105°C and expanded operating temperature range (-40°C to 105°C). However, this part carries a "Not For New Designs" product status designation and REACH Affected compliance status. Selection is restricted to legacy system maintenance and field replacement scenarios where original component sourcing is exhausted.

Frequently Asked Questions (FAQ)

Q: Can the SK4R7M350ST be replaced with a lower voltage-rated substitute?

A: No. Substitute parts must maintain equal or greater voltage ratings. Voltage downrating is not permitted and creates electrical stress conditions that compromise component reliability.

Q: Are all substitute parts physically identical to the SK4R7M350ST?

A: All substitute parts share identical lead spacing (0.197" / 5.00mm), diameter (0.394" / 10.00mm), and mounting type (through-hole radial). Height dimensions vary slightly: the original part measures 0.591" (15.00mm) maximum, while all substitutes measure 0.571" (14.50mm) maximum. This 0.020" (0.50mm) reduction is within typical PCB layout tolerances and does not affect mechanical compatibility.

Q: Which substitute offers the best long-term reliability?

A: Both the 400LLE4R7MEFC10X12.5 and ULD2G4R7MPD provide 15000-hour lifetime ratings at 105°C, representing the highest reliability metrics in this substitution group. The 400LLE4R7MEFC10X12.5 is preferred for new designs due to its Active product status, while the ULD2G4R7MPD is restricted to legacy applications.

Q: What is the significance of the "Not For New Designs" status on the ULD2G4R7MPD?

A: This designation indicates that the manufacturer (Nichicon) has discontinued active development and production planning for this component series. While existing inventory remains available and functional, this part should be selected only for field replacement of existing assemblies or legacy system maintenance. New product designs should utilize the 400LLE4R7MEFC10X12.5 or 400LEX4.7MEFC10X12.5 alternatives.

Q: Do all substitute parts maintain ROHS3 compliance?

A: Yes. All substitute parts listed carry ROHS3 Compliant certification. The ULD2G4R7MPD carries REACH Affected status, which requires compliance verification within specific regulatory jurisdictions but does not affect component functionality or electrical performance.

Q: Can substitute parts be intermixed within a single assembly?

A: Yes. All substitute parts maintain identical electrical parameters (capacitance, tolerance, polarization) and physical dimensions (lead spacing, diameter, mounting type). Intermixing is electrically and mechanically compatible. However, thermal management design should account for variations in lifetime ratings if multiple substitute types are deployed in thermally sensitive circuit locations.

Q: What ripple current specifications apply to substitute parts?

A: The 400LLE4R7MEFC10X12.5 and ULD2G4R7MPD support 61 mA at 120 Hz and 122 mA at 100 kHz. The 400LEX4.7MEFC10X12.5 supports identical ripple current specifications. The 450PK4R7MEFC10X12.5 supports 46 mA at 120 Hz. Selection should verify that circuit ripple current demands do not exceed the substitute part's rated capacity.