SK331M050ST Equivalent & Substitute Parts Reference

Part Overview

The SK331M050ST is a 330 µF, 50 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in radial, can package configuration. This component is classified as Active product status and is designed for general-purpose applications requiring reliable energy storage and filtering in power supply circuits, audio equipment, and industrial electronics.

Substitute parts become necessary when the primary SK331M050ST experiences supply constraints, extended lead times, or when design flexibility permits component sourcing from alternative manufacturers. The substitute parts listed maintain electrical equivalence across critical parameters including capacitance, voltage rating, tolerance, and operating temperature range, ensuring functional interchangeability within specified application boundaries.

Substiute Parts

SK331M050ST

Cornell Dubilier Electronics (CDE)In Stock: 956SK331M050ST Datasheet

Current PartRFQ

UVR1H331MPD

NichiconIn Stock: 14371UVR1H331MPD Datasheet

DirectRFQ

ECA-1HM331

Panasonic Electronic ComponentsIn Stock: 19379ECA-1HM331 Datasheet

SimilarRFQ

ECA-1HM331B

Panasonic Electronic ComponentsIn Stock: 82936ECA-1HM331B Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the SK331M050ST is based on strict electrical and mechanical parameter matching. All substitute parts must satisfy the following mandatory criteria:

Electrical Equivalence Requirements:

• Capacitance: 330 µF (exact match)
• Voltage Rating: 50 V (minimum, equal or higher acceptable)
• Tolerance: ±20% (matching or tighter tolerance acceptable)
• Operating Temperature: -40°C to 85°C (minimum range requirement)
• Lifetime: 2000 Hrs @ 85°C (minimum requirement)

Mechanical Compatibility Requirements:

• Lead Spacing: 0.197" (5.00mm) (exact match for PCB footprint compatibility)
• Package Type: Radial, Can (exact match)
• Mounting Type: Through Hole (exact match)
• Physical Dimensions: 0.394" Dia (10.00mm) (exact match for can diameter)

Regulatory Compliance:

• RoHS3 Compliance (mandatory for new designs and ongoing production)
• REACH Unaffected status (required for unrestricted use)

The substitute parts identified below meet all mandatory criteria and are therefore electrically and mechanically interchangeable with the SK331M050ST in applications where these parameters define the design specification.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: SK331M050ST (CDE)

The SK331M050ST maintains Active product status and is the preferred component for new designs. This part is currently in production and available in inventory (847 Pcs). Selection of the primary part is recommended when supply is available and design schedules permit standard lead times.

Secondary Selection: ECA-1HM331B (Panasonic)

The ECA-1HM331B is the recommended substitute for the SK331M050ST. This part carries Active product status, ensuring continued availability for production and future design iterations. The ECA-1HM331B is supplied in Tape & Box packaging with the highest inventory availability (82,918 Pcs), providing supply chain stability. Physical height is reduced to 0.669" (17.00mm) compared to the SK331M050ST at 0.906" (23.00mm), which may provide PCB layout advantages in space-constrained applications. All electrical parameters match the primary part exactly.

Tertiary Selection: ECA-1HM331 (Panasonic)

The ECA-1HM331 is an alternative Panasonic substitute with Active product status. This part is supplied in Bulk packaging with substantial inventory (19,269 Pcs). Physical height is 0.669" (17.00mm). Electrical parameters are identical to the ECA-1HM331B. Selection between ECA-1HM331 and ECA-1HM331B depends on packaging requirements and procurement preferences.

Not Recommended for New Designs: UVR1H331MPD (Nichicon)

The UVR1H331MPD carries Not For New Designs product status and is not suitable for new design implementations. This part may be used only for legacy system maintenance or repair of existing equipment where the original specification explicitly requires Nichicon components. The UVR1H331MPD exhibits reduced physical height (0.689" at 17.50mm) and higher ripple current ratings (590 mA @ 120 Hz, 885 mA @ 10 kHz) compared to the primary part, indicating different thermal and electrical performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can ECA-1HM331B be used as a direct replacement for SK331M050ST on existing PCBs?

A: Yes. The ECA-1HM331B is electrically and mechanically equivalent to the SK331M050ST. Both parts share identical lead spacing (0.197" / 5.00mm), can diameter (0.394" / 10.00mm), and mounting type (Through Hole Radial). The reduced height of the ECA-1HM331B (0.669" vs. 0.906") does not affect PCB compatibility, as the component will occupy less vertical space. No PCB redesign is required.

Q: What is the difference between ECA-1HM331 and ECA-1HM331B?

A: The primary difference is packaging format. ECA-1HM331 is supplied in Bulk packaging, while ECA-1HM331B is supplied in Tape & Box (TB) packaging. Electrical specifications and physical dimensions are identical. Selection depends on procurement and assembly process requirements. Tape & Box packaging is typically preferred for automated assembly operations.

Q: Why is UVR1H331MPD marked as Not For New Designs?

A: The UVR1H331MPD carries Not For New Designs status, indicating that Nichicon has discontinued active development and production optimization for this part number. While the part remains electrically equivalent and suitable for legacy system support, new design implementations should utilize parts with Active status (SK331M050ST, ECA-1HM331, or ECA-1HM331B) to ensure long-term supply availability and manufacturing consistency.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All parts listed (SK331M050ST, UVR1H331MPD, ECA-1HM331, and ECA-1HM331B) are ROHS3 Compliant and REACH Unaffected. These certifications confirm compliance with current environmental and hazardous substance regulations for unrestricted use in commercial and industrial applications.

Q: What is the significance of the 2000 Hrs @ 85°C lifetime specification?

A: The 2000 Hrs @ 85°C lifetime rating specifies the expected operational duration of the capacitor under maximum rated temperature conditions. All substitute parts meet or exceed this specification, ensuring equivalent reliability and service life in thermal stress environments. This parameter is critical for applications requiring predictable component degradation rates and maintenance planning.

Q: Can height differences between substitute parts affect circuit performance?

A: No. Height differences do not affect electrical performance. The SK331M050ST (0.906" height) and substitute parts (0.669"-0.689" height) deliver identical capacitance, voltage rating, and frequency response. Height variations only impact PCB layout and mechanical clearance considerations. Shorter substitute parts may provide advantages in space-constrained designs without performance compromise.