SN331M6R3ST Equivalent & Substitute Parts

Part Overview

The SN331M6R3ST is a 330 µF, 6.3 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in a radial, through-hole package. This component is currently obsolete, necessitating the identification of compatible substitute parts that maintain equivalent electrical and mechanical characteristics while offering continued supply availability.

Substiute Parts

SN331M6R3ST

Cornell Dubilier Electronics (CDE)In Stock: 743SN331M6R3ST Datasheet

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ECE-A1AN331U

Panasonic Electronic ComponentsIn Stock: 1858ECE-A1AN331U Datasheet

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ECE-A1CN331U

Panasonic Electronic ComponentsIn Stock: 1096ECE-A1CN331U Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN331M6R3ST is based on the following mandatory parameters:

• Capacitance: 330 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Package Type: Radial, Can (exact match required)
• Mounting Type: Through Hole (exact match required)
• Lead Spacing: 0.197" (5.00mm) (exact match required)
• Physical Dimensions: 0.394" Dia × 0.630" Height (exact match required)
• Operating Temperature Range: -40°C ~ 85°C (exact match required)
• Voltage Rating: Must be rated equal to or greater than 6.3 V

The substitute parts identified—ECE-A1AN331U (10 V rated) and ECE-A1CN331U (16 V rated)—satisfy all mandatory parameters. Both are manufactured by Panasonic Electronic Components and feature identical physical dimensions, lead spacing, and capacitance values. Higher voltage ratings are permissible and do not degrade performance when operating at the design voltage of 6.3 V.

Parameter Comparison

Engineering Selection Recommendations

Both Panasonic ECE-A1 series substitutes are active products with ROHS3 compliance and proven supply availability. The ECE-A1AN331U (10 V) provides a direct voltage upgrade while maintaining all mechanical and electrical compatibility. The ECE-A1CN331U (16 V) offers additional voltage margin for applications requiring higher transient spike tolerance.

Selection between ECE-A1AN331U and ECE-A1CN331U depends on circuit voltage headroom requirements. Both parts demonstrate superior reliability over the original SN331M6R3ST, with rated lifetime extended to 2000 hours at 85°C versus the original 1000 hours. Physical PCB footprint compatibility is identical.

Frequently Asked Questions (FAQ)

Q: Can ECE-A1AN331U and ECE-A1CN331U be used interchangeably? A: Both substitutes are mechanically and electrically identical except for voltage rating. They share the same footprint, lead spacing, and dimensions. Selection is determined solely by circuit voltage requirements and design margins.

Q: Is the higher voltage rating of ECE-A1CN331U problematic? A: No. A higher voltage-rated capacitor operating below its rating does not degrade performance or reliability. The 16 V part is suitable for applications designed for 6.3 V operation.

Q: How does the lifetime specification comparison affect part selection? A: The Panasonic substitutes offer 2000 hours rated lifetime at 85°C, compared to 1000 hours for the obsolete CDE original. This extended lifetime is a functional improvement and does not introduce compatibility issues.

Q: Are through-hole modifications required when replacing the original part? A: No. Both substitute parts maintain identical through-hole lead spacing of 0.197" (5.00mm) and physical dimensions. Direct PCB substitution is supported without rework.

Q: What compliance certifications apply to these substitutes? A: Both ECE-A1AN331U and ECE-A1CN331U are ROHS3 compliant and unaffected by REACH regulations, meeting current environmental and regulatory standards.