SN331M016ST Equivalent & Substitute Parts Reference

Part Overview

The SN331M016ST is a 330 µF, 16 V aluminum electrolytic capacitor in radial, can package manufactured by Cornell Dubilier Electronics (CDE). This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part operates across a temperature range of -40°C to 85°C with a rated lifetime of 1000 hours at 85°C and an equivalent series resistance of 680 mOhm at 120 Hz. Substitution is required to access active product lines with extended operational lifetimes and improved performance characteristics while maintaining electrical and mechanical compatibility.

Substiute Parts

SN331M016ST

Cornell Dubilier Electronics (CDE)In Stock: 1264SN331M016ST Datasheet

Current PartRFQ

ECE-A1EN331U

Panasonic Electronic ComponentsIn Stock: 1017ECE-A1EN331U Datasheet

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ECE-A1VN331U

Panasonic Electronic ComponentsIn Stock: 891ECE-A1VN331U 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 logic for the SN331M016ST is based on the following criteria:

Upgrade Substitutes (ECE-A1EN331U, ECE-A1VN331U): These Panasonic parts maintain identical capacitance (330 µF), tolerance (±20%), lead spacing (5.00 mm), mounting type (Through Hole), and package style (Radial, Can). They feature higher rated voltages (25 V and 35 V respectively) and extended lifetime ratings (2000 Hrs @ 85°C versus 1000 Hrs @ 85°C). These parts are suitable for applications where the original 16 V rating is sufficient but improved reliability and extended operational life are beneficial.

Similar Substitute (ECE-A1CN331U): This Panasonic part matches the SN331M016ST in capacitance (330 µF), tolerance (±20%), voltage rating (16 V), lead spacing (5.00 mm), mounting type (Through Hole), and package style (Radial, Can). The primary distinction is the extended lifetime (2000 Hrs @ 85°C) and active product status. Physical dimensions differ slightly (0.394" diameter and 0.630" height versus 0.512" diameter and 0.787" height), requiring verification of available PCB space.

All substitute parts are ROHS3 compliant and maintain bi-polar polarization consistent with the original part.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Same Voltage Rating):

The ECE-A1CN331U is the direct equivalent to the SN331M016ST. Both parts share identical electrical specifications: 330 µF capacitance, ±20% tolerance, and 16 V voltage rating. The ECE-A1CN331U offers the advantage of active product status and doubled operational lifetime (2000 Hrs @ 85°C). Physical dimensions are smaller (0.394" diameter, 0.630" height), which may provide layout benefits or require PCB modification depending on existing mounting provisions. This part is recommended for applications requiring exact electrical performance with improved reliability.

For Voltage Margin Applications:

The ECE-A1EN331U (25 V) and ECE-A1VN331U (35 V) provide higher voltage ratings while maintaining the same 330 µF capacitance and ±20% tolerance. These parts are suitable for circuits where the original 16 V specification provides insufficient safety margin or where system voltage may fluctuate. Both parts feature extended 2000-hour lifetimes at 85°C. The ECE-A1EN331U maintains the same physical dimensions as the original part (0.512" diameter, 0.787" height), simplifying PCB integration. The ECE-A1VN331U uses identical dimensions and offers the highest voltage rating among available substitutes.

All substitute parts maintain ROHS3 compliance and through-hole mounting compatibility with the original SN331M016ST.

Frequently Asked Questions (FAQ)

Q: Can ECE-A1EN331U or ECE-A1VN331U be used in place of SN331M016ST?

A: Yes. Both parts maintain the required 330 µF capacitance, ±20% tolerance, and -40°C to 85°C operating temperature range. The higher voltage ratings (25 V and 35 V) are compatible with circuits designed for 16 V operation. Lead spacing (5.00 mm) and through-hole mounting are identical. Physical dimensions match the original part, ensuring direct PCB compatibility.

Q: What is the difference between ECE-A1CN331U and the upgrade substitutes?

A: ECE-A1CN331U matches the original SN331M016ST voltage rating (16 V) exactly, making it the closest electrical equivalent. ECE-A1EN331U and ECE-A1VN331U provide higher voltage ratings (25 V and 35 V) for applications requiring additional voltage margin. All three parts share identical lead spacing and mounting type but differ in physical dimensions and ripple current ratings.

Q: Does the smaller size of ECE-A1CN331U affect compatibility?

A: The ECE-A1CN331U has a smaller diameter (0.394" versus 0.512") and height (0.630" versus 0.787"). Lead spacing remains identical at 5.00 mm. Compatibility depends on available PCB space. If the original footprint allows clearance, the smaller size presents no compatibility issue. If space is constrained, verify that the smaller dimensions do not conflict with adjacent components.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The SN331M016ST and all three substitute parts (ECE-A1EN331U, ECE-A1VN331U, ECE-A1CN331U) are ROHS3 compliant, meeting current regulatory requirements for hazardous substance restrictions.

Q: What is the advantage of the 2000-hour lifetime in substitute parts?

A: The original SN331M016ST is rated for 1000 hours at 85°C. All substitute parts extend this to 2000 hours at 85°C, doubling the operational lifetime under thermal stress. This improvement enhances long-term reliability in applications subject to sustained elevated temperatures.

Q: Can these parts be used interchangeably on the same PCB?

A: ECE-A1EN331U and ECE-A1VN331U can be used interchangeably with the original SN331M016ST due to identical lead spacing and physical dimensions. ECE-A1CN331U requires verification of available PCB space due to smaller physical dimensions, though lead spacing remains compatible.