SN331M035ST Equivalent & Substitute Parts

Part Overview

The SN331M035ST is a 330 µF, 35 V aluminum electrolytic capacitor in radial, can package manufactured by Cornell Dubilier Electronics (CDE). This component is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. The part operates across a temperature range of -40°C to 85°C and is rated for 1000 hours at 85°C with a 560 mOhm equivalent series resistance at 120 Hz. Identification of compatible alternatives ensures design continuity and supply chain reliability for general-purpose applications.

Substiute Parts

SN331M035ST

Cornell Dubilier Electronics (CDE)In Stock: 1249SN331M035ST Datasheet

Current PartRFQ

ECE-A1HN331U

Panasonic Electronic ComponentsIn Stock: 867ECE-A1HN331U Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN331M035ST is based on the following electrical and mechanical compatibility criteria:

Electrical Parameters:

• Capacitance value must equal 330 µF
• Tolerance must be ±20%
• Rated voltage must be equal to or greater than 35 V
• Operating temperature range must encompass -40°C to 85°C
• Polarization must be Bi-Polar

Mechanical Parameters:

• Mounting type must be Through Hole
• Package type must be Radial, Can
• Lead spacing must be 0.295" (7.50 mm)
• Physical dimensions (diameter and height) must match or be compatible with the original footprint

Compliance Parameters:

• RoHS3 compliance required

The ECE-A1HN331U from Panasonic Electronic Components meets all substitution criteria. This part maintains identical capacitance, tolerance, and mechanical specifications while providing an upgraded rated voltage of 50 V and extended lifetime rating of 2000 hours at 85°C compared to the original 1000 hours.

Parameter Comparison

Engineering Selection Recommendations

The ECE-A1HN331U is the qualified substitute for the obsolete SN331M035ST. Selection is based on the following engineering factors:

Product Status: The SN331M035ST is obsolete, necessitating transition to an active product. The ECE-A1HN331U maintains active product status with established supply chain availability.

Electrical Compatibility: Both parts share identical capacitance (330 µF) and tolerance (±20%). The ECE-A1HN331U provides a higher rated voltage (50 V versus 35 V), which is acceptable for direct substitution in applications designed for 35 V operation. The extended lifetime rating of 2000 hours at 85°C for the ECE-A1HN331U exceeds the original 1000-hour specification.

Mechanical Compatibility: Lead spacing, package type, and physical dimensions are identical between both parts, ensuring direct board-level compatibility without layout modifications.

Compliance: Both parts are ROHS3 compliant, meeting current regulatory requirements. The ECE-A1HN331U carries REACH Unaffected status, providing additional compliance assurance.

Frequently Asked Questions (FAQ)

Q: Can the ECE-A1HN331U directly replace the SN331M035ST without circuit modifications?

A: Yes. The ECE-A1HN331U is mechanically and electrically compatible for direct substitution. Identical lead spacing (0.295"), package type (Radial, Can), and physical dimensions (0.630" diameter, 0.984" height) ensure board-level compatibility. The higher rated voltage (50 V) is suitable for circuits designed for 35 V operation.

Q: What is the significance of the voltage rating difference between the two parts?

A: The SN331M035ST is rated for 35 V, while the ECE-A1HN331U is rated for 50 V. In substitution, a higher voltage rating is acceptable and does not degrade circuit performance. The substitute part will operate safely in applications requiring 35 V or lower.

Q: How do the lifetime ratings compare?

A: The SN331M035ST is rated for 1000 hours at 85°C. The ECE-A1HN331U provides 2000 hours at 85°C, representing a 100% improvement in thermal life expectancy. This extended rating enhances reliability in temperature-sensitive applications.

Q: Are there any differences in ripple current handling?

A: The SN331M035ST specifies 630 mA ripple current at 120 Hz. The ECE-A1HN331U specifies 450 mA at 120 Hz and 765 mA at 10 kHz. Application-specific ripple current requirements must be evaluated against these specifications.

Q: Do both parts meet current regulatory compliance standards?

A: Yes. Both the SN331M035ST and ECE-A1HN331U are ROHS3 compliant. The ECE-A1HN331U additionally carries REACH Unaffected status, confirming compliance with current environmental and safety regulations.

Q: What is the lead spacing and can it be used in existing PCB layouts?

A: Both parts have identical lead spacing of 0.295" (7.50 mm). The ECE-A1HN331U can be installed directly into existing PCB footprints designed for the SN331M035ST without layout modifications.