SEK330M350ST Equivalent & Substitute Parts

Part Overview

The SEK330M350ST is a 33 µF, 350 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in a radial, through-hole configuration. This component is classified as Active product status and is designed for general-purpose applications requiring stable capacitance and extended operational life at elevated temperatures. The SEK series capacitor operates across a temperature range of -40°C to 105°C with a rated lifetime of 2000 hours at 105°C.

Equivalent and substitute parts are identified when design requirements permit voltage derating, dimensional tolerance, or when inventory constraints necessitate alternative sourcing from qualified manufacturers while maintaining functional compatibility within the application circuit.

Substiute Parts

SEK330M350ST

Cornell Dubilier Electronics (CDE)In Stock: 1209SEK330M350ST Datasheet

Current PartRFQ

UAS2G330MHD

NichiconIn Stock: 1144UAS2G330MHD Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the SEK330M350ST is based on the following allowed parameters:

Capacitance Match: Substitute parts must provide exactly 33 µF capacitance to maintain circuit functionality and frequency response characteristics.

Voltage Rating: Substitute parts must meet or exceed the 350 V rated voltage specification. Higher voltage ratings are acceptable as they provide additional safety margin and derating capability.

Tolerance: Substitute parts must maintain ±20% tolerance to ensure circuit performance remains within design specifications.

Temperature Performance: Substitute parts must support the full operating range of -40°C to 105°C and maintain a rated lifetime of 2000 hours at 105°C or greater.

Mechanical Compatibility: Substitute parts must be radial, through-hole mounted aluminum electrolytic capacitors with identical lead spacing (0.295" / 7.50mm) to ensure direct PCB footprint compatibility.

Polarization: Substitute parts must be polar capacitors to maintain circuit polarity requirements.

Regulatory Compliance: Substitute parts must maintain ROHS3 compliance and REACH unaffected status to satisfy manufacturing and environmental standards.

The substitute part UAS2G330MHD from Nichicon meets all critical substitution criteria with the exception of physical dimensions, which are larger but do not affect electrical compatibility or lead spacing.

Parameter Comparison

Engineering Selection Recommendations

Primary Part - SEK330M350ST (CDE): The SEK330M350ST is the specified component and remains the first choice for new designs and direct replacement applications. This part carries Active product status, full ROHS3 compliance, and REACH unaffected certification. The component is currently in stock with 1108 units available.

Substitute Part - UAS2G330MHD (Nichicon): The UAS2G330MHD is a qualified substitute when the SEK330M350ST is unavailable or when design requirements permit voltage derating to 400 V operation. This part meets all critical electrical parameters: identical 33 µF capacitance, ±20% tolerance, matching temperature range (-40°C to 105°C), and equivalent 2000-hour lifetime at 105°C. The substitute part carries Active product status and maintains ROHS3 compliance and REACH unaffected status.

Dimensional Considerations: The UAS2G330MHD exhibits larger radial diameter (0.630" versus 0.512") but shorter seated height (0.866" versus 0.984"). Lead spacing remains identical at 0.295" (7.50mm), ensuring direct PCB footprint compatibility. Physical space constraints within the application enclosure must be evaluated before substitution.

Voltage Derating: The UAS2G330MHD operates at 400 V rated voltage, providing 50 V additional margin above the SEK330M350ST specification. This higher voltage rating does not affect circuit functionality and may extend component operational life through improved derating characteristics.

Frequently Asked Questions (FAQ)

Q: Can the UAS2G330MHD directly replace the SEK330M350ST in existing designs?

A: The UAS2G330MHD is electrically compatible with the SEK330M350ST for all critical parameters: capacitance, tolerance, temperature range, and lifetime. Lead spacing is identical, enabling direct PCB footprint compatibility. Physical dimensions differ; the substitute part is wider in diameter but shorter in height. Verify available space within the application enclosure before substitution.

Q: What is the significance of the 400 V rating on the UAS2G330MHD compared to the 350 V rating on the SEK330M350ST?

A: The higher voltage rating on the substitute part provides additional safety margin and derating capability. In a 350 V application, the UAS2G330MHD operates at reduced stress, which may extend operational life and improve reliability. The substitute part is suitable for all applications rated at 350 V or lower.

Q: Are both parts compliant with current manufacturing standards?

A: Both the SEK330M350ST and UAS2G330MHD are ROHS3 compliant and REACH unaffected. Both parts meet current regulatory requirements for electronic component manufacturing and environmental standards.

Q: What is the difference in ripple current handling between these parts?

A: The SEK330M350ST specifies 195 mA ripple current at 120 Hz and 351 mA at 10 kHz. The UAS2G330MHD specifies 225 mA at 120 Hz and 360 mA at 10 kHz. The substitute part exhibits slightly higher ripple current capacity, indicating enhanced thermal performance characteristics.

Q: Can the UAS2G330MHD be used in applications where the SEK330M350ST is specified?

A: The UAS2G330MHD is suitable for applications where the SEK330M350ST is specified, provided that physical space constraints are satisfied and the higher voltage rating does not conflict with circuit design requirements. All electrical parameters remain compatible.

Q: What is the lead spacing for both parts, and does it affect PCB compatibility?

A: Both the SEK330M350ST and UAS2G330MHD feature identical lead spacing of 0.295" (7.50mm). This identical spacing ensures direct PCB footprint compatibility without requiring layout modifications.

Q: Are there inventory considerations when selecting between these parts?

A: The SEK330M350ST has 1108 units in stock, while the UAS2G330MHD has 1121 units in stock. Both parts are currently available. Inventory status may change; verify current availability at the time of procurement.