SN330M025ST

Part Overview

The SN330M025ST is a 33 µF, 25 V aluminum electrolytic capacitor in radial, can package manufactured by Cornell Dubilier Electronics (CDE). This part is classified as obsolete. As an obsolete product, identifying equivalent and substitute parts ensures circuit continuity and supply chain reliability for designs utilizing this component.

Substiute Parts

SN330M025ST

Cornell Dubilier Electronics (CDE)In Stock: 777SN330M025ST Datasheet

Current PartRFQ

ECE-A1HN330U

Panasonic Electronic ComponentsIn Stock: 2474ECE-A1HN330U Datasheet

UpgradeRFQ

ECE-A1VN330U

Panasonic Electronic ComponentsIn Stock: 1748ECE-A1VN330U Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN330M025ST is based on the following critical parameters: capacitance (33 µF), tolerance (±20%), operating temperature range (-40°C ~ 85°C), mechanical dimensions (0.315" diameter, 0.453" maximum height), lead spacing (0.138"), and mounting type (through hole radial). Substitute parts must match these core electrical and mechanical specifications to ensure pin-for-pin compatibility and mechanical fit within the PCB footprint.

The identified substitutes—ECE-A1HN330U and ECE-A1VN330U—maintain identical capacitance, tolerance, temperature range, package dimensions, and lead spacing. The primary distinction is voltage rating, where substitutes provide equal or greater voltage capability. This is a valid substitution criterion in capacitor design, as a component rated for higher voltage remains functionally compatible in applications requiring lower voltage operation.

Parameter Comparison

Engineering Selection Recommendations

Both ECE-A1HN330U and ECE-A1VN330U are active products from Panasonic Electronic Components and maintain full ROHS3 compliance. ECE-A1HN330U offers the highest voltage margin at 50 V, providing additional design safety headroom. ECE-A1VN330U at 35 V provides a more moderate voltage elevation. Both substitutes offer superior lifetime ratings (2000 Hrs @ 85°C) compared to the original SN330M025ST (1000 Hrs @ 85°C), enhancing overall circuit reliability. Selection between the two Panasonic alternatives depends on circuit voltage margin requirements and PCB layout constraints.

Frequently Asked Questions (FAQ)

Q: Can ECE-A1HN330U or ECE-A1VN330U be used in place of SN330M025ST without PCB modifications?

A: Yes. Both substitutes maintain identical mechanical dimensions (lead spacing, can diameter, seated height) and through-hole mounting type, enabling direct plug-and-play replacement without PCB footprint changes.

Q: Why do the substitute parts have higher voltage ratings (50 V and 35 V) than the original (25 V)?

A: Higher voltage ratings do not introduce compatibility issues in lower-voltage applications. A 50 V or 35 V capacitor operates correctly in a 25 V circuit and provides increased voltage margin, which may improve circuit stability and longevity.

Q: Are there differences in electrical performance between the three parts?

A: All three parts share identical capacitance (33 µF) and tolerance (±20%). The substitute parts provide extended lifetime (2000 Hrs @ 85°C versus 1000 Hrs @ 85°C) and slightly elevated ripple current ratings. ESR data for the Panasonic substitutes is not provided in available documentation.

Q: What is the significance of the "Bi-Polar" polarization designation?

A: Bi-polar designation indicates these are standard aluminum electrolytic capacitors with proper polarity requirements for circuit installation. Polarity marking on the can must be observed during assembly.

Q: Which substitute is preferred for new designs?

A: Both Panasonic ECE-A1 series parts are active products with ROHS3 compliance and superior reliability metrics. Selection should be based on circuit voltage requirements and supply availability rather than inherent technical superiority.