SK331M016ST Equivalent & Substitute Parts

Part Overview

The SK331M016ST is a 330 µF, 16 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in a radial, through-hole configuration. This component is classified as Active and serves general-purpose applications requiring stable capacitance performance across industrial temperature ranges. The SK series capacitor is rated for 2000 hours of operation at 85°C with an equivalent series resistance (ESR) of 640 mOhm, making it suitable for power supply filtering, energy storage, and signal coupling applications.

Equivalent and substitute parts are necessary when the primary SK331M016ST becomes unavailable due to inventory constraints, supply chain disruptions, or end-of-life status of specific manufacturers. Substitute components must maintain electrical equivalence across critical parameters including capacitance value, voltage rating, tolerance, operating temperature range, and physical form factor to ensure direct replacement without circuit redesign.

Substiute Parts

SK331M016ST

Cornell Dubilier Electronics (CDE)In Stock: 798SK331M016ST Datasheet

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ECA-1CM331

Panasonic Electronic ComponentsIn Stock: 11624ECA-1CM331 Datasheet

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ECA-1CM331B

Panasonic Electronic ComponentsIn Stock: 2817ECA-1CM331B Datasheet

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ESMG160ELL331MHB5D

Chemi-ConIn Stock: 5096ESMG160ELL331MHB5D Datasheet

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UVR1C331MPD

NichiconIn Stock: 3861UVR1C331MPD Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SK331M016ST is determined by strict equivalence across electrical and mechanical parameters. All substitute parts must satisfy the following criteria:

Electrical Equivalence Requirements:

• Capacitance: 330 µF (exact match)
• Voltage Rating: 16 V (exact match)
• Tolerance: ±20% (exact match)
• Operating Temperature Range: -40°C ~ 85°C (exact match)
• Lifetime: 2000 Hrs @ 85°C (exact match)

Mechanical Equivalence Requirements:

• Package Type: Radial, Can (exact match)
• Mounting Type: Through Hole (exact match)
• Diameter: 0.315" (8.00mm) (exact match)
• Polarization: Polar (required for electrolytic type)

Compliance Requirements:

• RoHS3 Compliant (mandatory)
• REACH Unaffected (mandatory)
• ECCN: EAR99 (mandatory)

The substitute parts identified below meet all critical electrical parameters and physical form factors. Minor variations in lead spacing and maximum seated height are permissible when they do not exceed PCB layout constraints. All substitutes maintain active product status or documented legacy support, ensuring availability and reliability.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Active Product Status):

The ECA-1CM331 (Panasonic M-A series) and ESMG160ELL331MHB5D (Chemi-Con SMG series) are recommended as primary substitutes. Both components maintain Active product status, ensuring continued availability and manufacturer support. These parts satisfy all critical electrical parameters and comply with RoHS3 and REACH requirements. The ECA-1CM331 features a lead spacing of 0.138" (3.50mm) matching the SK331M016ST, while the ESMG160ELL331MHB5D provides equivalent electrical performance with a maximum seated height of 0.512" (13.00mm), which is within acceptable tolerance for most through-hole PCB layouts.

Secondary Substitute (Tape & Box Packaging):

The ECA-1CM331B (Panasonic M-A series) is electrically equivalent to the ECA-1CM331 but features a lead spacing of 0.197" (5.00mm). This variant is suitable for applications where PCB layout accommodates the wider lead pitch. The Tape & Box packaging format supports automated assembly processes and high-volume production environments.

Legacy Substitute (Not For New Designs):

The UVR1C331MPD (Nichicon UVR series) is classified as Not For New Designs. While this component meets all electrical and mechanical equivalence criteria, its legacy status indicates that Nichicon does not recommend its use in new circuit designs. This part is suitable only for maintenance, repair, and obsolescence management of existing equipment.

Compliance Verification:

All substitute parts maintain ROHS3 compliance and REACH Unaffected status, satisfying regulatory requirements for commercial and industrial applications. ECCN classification as EAR99 applies uniformly across all parts, indicating standard commercial electronic components with no export restrictions.

Frequently Asked Questions (FAQ)

Q: Can the ECA-1CM331B substitute for the SK331M016ST in existing PCB designs?

A: The ECA-1CM331B is electrically equivalent but features a lead spacing of 0.197" (5.00mm) compared to the SK331M016ST's 0.138" (3.50mm). Direct substitution requires PCB layout verification to confirm that the wider lead pitch does not conflict with existing pad spacing. If PCB pads are designed for 0.138" spacing, the ECA-1CM331 (with matching 0.138" lead spacing) is the appropriate substitute.

Q: What is the significance of the "Not For New Designs" status of the UVR1C331MPD?

A: The "Not For New Designs" designation indicates that Nichicon has discontinued active development and marketing of the UVR series for new applications. This part remains available for existing equipment maintenance and repair but should not be selected for new circuit designs. For new designs, select from the Active status substitutes: ECA-1CM331, ECA-1CM331B, or ESMG160ELL331MHB5D.

Q: Are there differences in ripple current handling between substitute parts?

A: Ripple current specifications are provided for some substitutes but not for the SK331M016ST. The ECA-1CM331 and ECA-1CM331B specify 595 mA @ 10 kHz. The ESMG160ELL331MHB5D specifies 555 mA @ 100 kHz and 370 mA @ 120 Hz. The UVR1C331MPD specifies 555 mA @ 10 kHz and 370 mA @ 120 Hz. These variations do not affect substitution eligibility, as all parts meet the 2000-hour lifetime requirement at 85°C.

Q: Do all substitute parts comply with RoHS3 and REACH regulations?

A: Yes. All identified substitute parts are ROHS3 Compliant and REACH Unaffected. All parts are classified as EAR99 for export control purposes, indicating standard commercial electronic components.

Q: What is the maximum seated height tolerance for PCB layout compatibility?

A: The SK331M016ST has a maximum seated height of 0.531" (13.50mm). The ECA-1CM331 and ECA-1CM331B have maximum seated heights of 0.492" (12.50mm), which is 0.039" shorter. The ESMG160ELL331MHB5D and UVR1C331MPD have maximum seated heights of 0.512" (13.00mm), which is 0.019" shorter. These variations are within typical PCB clearance tolerances for through-hole components and do not prevent substitution in standard applications.

Q: Can the SK331M016ST be substituted with parts from different manufacturers in the same circuit?

A: Yes. All identified substitutes meet identical electrical specifications (330 µF, 16 V, ±20%, 2000 Hrs @ 85°C) and physical form factors (Radial, Can, Through Hole). Multiple substitutes from different manufacturers can be used in the same circuit without functional impact, provided that lead spacing and seated height are verified against PCB layout constraints.

Q: What packaging formats are available for the substitute parts?

A: The ECA-1CM331 is supplied in Bulk packaging. The ECA-1CM331B is supplied in Tape & Box (TB) format, suitable for automated assembly. The ESMG160ELL331MHB5D and UVR1C331MPD are supplied in Bulk packaging. Packaging selection depends on production volume and assembly process requirements.