SK330M025ST Equivalent & Substitute Parts Reference

Part Overview

The SK330M025ST is a 33 µF, 25 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in radial, through-hole configuration. This component is classified as Active product status and is designed for general-purpose applications requiring stable capacitance performance across industrial temperature ranges.

Substitute parts become necessary when SK330M025ST inventory is unavailable, when supply chain constraints occur, or when design flexibility permits equivalent electrical and mechanical specifications. The substitute parts listed maintain identical core electrical parameters: 33 µF capacitance, ±20% tolerance, 25 V rated voltage, radial through-hole mounting, and 2000-hour lifetime rating at 85°C.

Substiute Parts

SK330M025ST

Cornell Dubilier Electronics (CDE)In Stock: 1234SK330M025ST Datasheet

Current PartRFQ

ECA-1EM330

Panasonic Electronic ComponentsIn Stock: 11597ECA-1EM330 Datasheet

DirectRFQ

UVR1E330MDD

NichiconIn Stock: 4317UVR1E330MDD Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the SK330M025ST is based strictly on the following allowed parameters:

Electrical Parameters (Non-Negotiable):

• Capacitance: 33 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Voltage Rating: 25 V (exact match required)
• Lifetime: 2000 Hrs @ 85°C (exact match required)
• Operating Temperature: -40°C ~ 85°C (exact match required)

Mechanical Parameters (Non-Negotiable):

• Mounting Type: Through Hole (exact match required)
• Package Type: Radial, Can (exact match required)
• Lead Spacing: 0.079" (2.00mm) (exact match required)
• Can Diameter: 0.197" (5.00mm) (exact match required)

Regulatory Parameters (Non-Negotiable):

• RoHS3 Compliance (exact match required)
• REACH Status: REACH Unaffected (exact match required)

All substitute parts listed meet these criteria. Variations in ESR (Equivalent Series Resistance), ripple current ratings, and height dimensions within the specified range do not disqualify substitution eligibility, as these parameters fall within acceptable tolerance bands for general-purpose applications.

Parameter Comparison

Engineering Selection Recommendations

ECA-1EM330 (Panasonic Electronic Components):

This substitute maintains Active product status, ensuring long-term availability and manufacturer support. All critical electrical and mechanical parameters match the SK330M025ST specification. The height dimension of 0.472" (12.00mm) is 0.040" (1.00mm) shorter than the main part, which provides additional clearance margin in PCB layouts. RoHS3 and REACH compliance certifications are identical. This part is recommended as the primary substitute when SK330M025ST inventory is unavailable.

UVR1E330MDD (Nichicon):

This substitute meets all critical electrical and mechanical parameters and maintains RoHS3 and REACH compliance. However, product status is classified as Obsolete, indicating that manufacturer production has ceased and future availability cannot be guaranteed. The height dimension of 0.492" (12.50mm) is 0.020" (0.50mm) shorter than the main part. This part is suitable for substitution only when ECA-1EM330 is unavailable and when long-term supply chain continuity is not a design requirement.

Selection Basis:

Substitution eligibility is determined exclusively by: (1) matching capacitance, tolerance, and voltage ratings; (2) identical lifetime and operating temperature specifications; (3) compatible through-hole radial mounting with matching lead spacing and can diameter; (4) equivalent regulatory compliance (RoHS3, REACH). Product status and inventory availability are secondary considerations that inform supply chain strategy but do not disqualify technical substitution.

Frequently Asked Questions (FAQ)

Q: Can ECA-1EM330 be used as a direct replacement for SK330M025ST on existing PCBs?

A: Yes. The ECA-1EM330 maintains identical lead spacing (0.079" / 2.00mm), can diameter (0.197" / 5.00mm), and mounting type (through-hole radial). The height difference of 0.040" (1.00mm) does not affect PCB compatibility and provides additional clearance. No PCB redesign is required.

Q: Why is UVR1E330MDD listed as a substitute if it is Obsolete?

A: UVR1E330MDD meets all critical electrical and mechanical substitution criteria. Obsolete status indicates that Nichicon has discontinued production, but existing inventory may remain available through authorized distributors. This part is listed for reference when current-production alternatives are temporarily unavailable. For new designs or long-term production, Active-status alternatives are preferred.

Q: Are there differences in ESR (Equivalent Series Resistance) between these parts?

A: The SK330M025ST specifies 5.63 Ohm ESR. The ECA-1EM330 and UVR1E330MDD do not publish ESR values in the provided specifications. ESR variation within aluminum electrolytic capacitor families is typical and does not disqualify substitution for general-purpose applications. Applications requiring specific ESR performance should verify manufacturer datasheets.

Q: Do all three parts have identical ripple current ratings?

A: Ripple current specifications are not uniformly published across all three parts. The SK330M025ST does not specify ripple current. The ECA-1EM330 specifies 187 mA @ 10 kHz, and the UVR1E330MDD specifies 190 mA @ 10 kHz. These values are comparable and do not affect substitution eligibility for general-purpose applications.

Q: What is the significance of the height dimension differences?

A: The SK330M025ST has a maximum seated height of 0.512" (13.00mm). The ECA-1EM330 is 0.040" (1.00mm) shorter, and the UVR1E330MDD is 0.020" (0.50mm) shorter. These differences provide additional clearance in PCB layouts and do not create compatibility issues. Taller components do not substitute for shorter specifications; shorter components are acceptable substitutes.

Q: Are all three parts RoHS3 and REACH compliant?

A: Yes. All three parts are ROHS3 Compliant and REACH Unaffected. Regulatory compliance is identical across all substitute options.

Q: Can these parts be used interchangeably in high-ripple-current applications?

A: Ripple current performance varies between manufacturers. For applications requiring specific ripple current performance, manufacturer datasheets must be consulted. The provided specifications show comparable ripple current ratings (187–190 mA @ 10 kHz) for the Panasonic and Nichicon parts, but the SK330M025ST ripple current is not specified. Applications with critical ripple current requirements should verify performance with the selected manufacturer.