SN331M025ST

Part Overview

The SN331M025ST is a 330 µF, 25 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in a radial, can package configuration. This component is classified as obsolete, necessitating identification of equivalent substitute parts for continued circuit design and maintenance applications. The need for alternative models arises from the discontinuation of this product line, requiring engineers to identify compatible replacements that maintain electrical and mechanical compatibility with existing designs.

Substiute Parts

SN331M025ST

Cornell Dubilier Electronics (CDE)In Stock: 897SN331M025ST Datasheet

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ECE-A1HN331U

Panasonic Electronic ComponentsIn Stock: 867ECE-A1HN331U Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the SN331M025ST is based on the following critical parameters that must remain consistent or improve upon the original specification:

Mandatory Compatibility Criteria:

• Capacitance: 330 µF (exact match required)
• Tolerance: ±20% (equivalent or better)
• Lead Spacing: 0.295" (7.50mm) (for PCB compatibility)
• Case Diameter: 0.630" (16.00mm) (for mechanical fit)
• Height - Seated (Max): 0.984" (25.00mm) (for mounting clearance)
• Mounting Type: Through Hole (connection methodology)
• Package / Case: Radial, Can (form factor)
• Operating Temperature Range: -40°C ~ 85°C or wider (functional envelope)
• Polarization: Bi-Polar (electrical characteristic)

Voltage Consideration: The rated voltage of a substitute part must equal or exceed 25 V. A higher voltage rating (such as 50 V) provides improved safety margin and does not compromise circuit function when the original design voltage requirement is 25 V.

Parameter Comparison

Engineering Selection Recommendations

The ECE-A1HN331U from Panasonic Electronic Components qualifies as a direct substitute for the obsolete SN331M025ST. Both components are ROHS3 compliant and share identical mechanical dimensions and lead spacing, ensuring direct PCB compatibility without layout modifications.

The Panasonic ECE-A1HN331U presents the following advantages: it maintains an active product status with established supply chain availability, provides a higher voltage rating (50 V versus 25 V), and offers extended lifetime specification (2000 Hrs @ 85°C versus 1000 Hrs @ 85°C). These characteristics meet or exceed the original design requirements while reducing obsolescence risk in future production runs.

Frequently Asked Questions (FAQ)

Q: Can the ECE-A1HN331U directly replace the SN331M025ST without PCB modifications?

A: Yes. Both components share identical lead spacing (0.295" / 7.50mm), case diameter (0.630" / 16.00mm), and seated height (0.984" / 25.00mm). No PCB layout changes are required for mechanical or electrical installation.

Q: What is the significance of the higher voltage rating (50 V vs. 25 V) on the substitute part?

A: The higher voltage rating of the ECE-A1HN331U does not negatively impact performance in a circuit designed for 25 V operation. The capacitor functions correctly at the lower voltage, and the increased rating margin enhances reliability and extends component service life under the specified operating conditions.

Q: Are there compliance or certification differences between these parts?

A: Both the SN331M025ST and ECE-A1HN331U carry ROHS3 compliance certification, meeting equivalent environmental and safety standards for electronic component manufacturing and use.

Q: Why is the ECE-A1HN331U recommended despite the ESR specification not being provided?

A: The ECE-A1HN331U meets all mandatory substitution criteria: identical capacitance (330 µF), equivalent tolerance (±20%), matching mechanical form factor, and compatible operating temperature range. The absence of stated ESR data does not disqualify the component; it reflects standard technical documentation practices from Panasonic for this product category and application class.

Q: Does the extended lifetime (2000 Hrs vs. 1000 Hrs @ 85°C) affect circuit design considerations?

A: The extended lifetime specification of the ECE-A1HN331U represents an operational improvement. This does not require design changes; it simply indicates longer expected service life under identical thermal conditions, reducing the probability of capacitor degradation in field applications.