SEK331M100ST Equivalent & Substitute Parts

Part Overview

The SEK331M100ST is a 330 µF, 100 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in radial, through-hole configuration. This component is classified as Active product status and is designed for general-purpose applications requiring reliable energy storage and filtering in power supply circuits, audio equipment, and industrial electronics.

Equivalent and substitute parts are identified when alternative manufacturers offer capacitors with matching or compatible electrical and mechanical specifications. This reference page documents verified substitute options that maintain functional equivalence within the defined parameter tolerances.

Substiute Parts

SEK331M100ST

Cornell Dubilier Electronics (CDE)In Stock: 866SEK331M100ST Datasheet

Current PartRFQ

ECA-2AHG331

Panasonic Electronic ComponentsIn Stock: 1511ECA-2AHG331 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SEK331M100ST are identified based on strict equivalence of the following critical parameters:

Electrical Equivalence Criteria:

• Capacitance value: 330 µF (exact match required)
• Rated voltage: 100 V (exact match required)
• Tolerance: ±20% (exact match required)
• Lifetime specification: 2000 Hrs @ 105°C (exact match or superior required)
• Operating temperature range: -55°C to 105°C (must encompass or match)

Mechanical Equivalence Criteria:

• Lead spacing: 0.295" (7.50 mm) (exact match required for PCB compatibility)
• Case diameter: 0.630" (16.00 mm) (exact match required for mounting envelope)
• Mounting type: Through Hole (exact match required)
• Package configuration: Radial, Can (exact match required)

Compliance Criteria:

• RoHS3 Compliant status (required for regulated applications)
• REACH Unaffected status (required for supply chain compliance)

Substitute parts must satisfy all criteria in each category to be considered functionally equivalent for direct replacement applications.

Parameter Comparison

Engineering Selection Recommendations

SEK331M100ST (Cornell Dubilier Electronics):

• Active product status with 770 units in stock
• ROHS3 Compliant and REACH Unaffected
• ESR specification provided: 400 mOhm
• Height: 25.00 mm (compact profile)
• Suitable for applications with space constraints

ECA-2AHG331 (Panasonic Electronic Components):

• Active product status with 1423 units in stock
• ROHS3 Compliant and REACH Unaffected
• Ripple current specifications provided: 540 mA @ 120 Hz, 810 mA @ 100 kHz
• Height: 27.00 mm (2 mm taller than primary part)
• Suitable for applications requiring documented ripple current performance

Both parts meet all electrical and mechanical equivalence criteria. Selection between them depends on application-specific requirements: choose SEK331M100ST for space-constrained designs; choose ECA-2AHG331 when ripple current performance documentation is required or when additional inventory availability is prioritized.

Frequently Asked Questions (FAQ)

Q: Can ECA-2AHG331 be used as a direct replacement for SEK331M100ST?

A: Yes, within the constraint that the ECA-2AHG331 is 2 mm taller (27.00 mm vs. 25.00 mm seated height). Verify that the PCB layout and enclosure clearance accommodate this height difference. All electrical parameters, lead spacing, and case diameter are identical.

Q: What does the ±20% tolerance specification mean?

A: The capacitance value may vary by ±20% from the nominal 330 µF rating. Both the SEK331M100ST and ECA-2AHG331 share this tolerance class, ensuring equivalent performance in applications where this tolerance is acceptable.

Q: Are both parts suitable for high-temperature applications?

A: Yes. Both parts are rated for operation up to 105°C and maintain a 2000-hour lifetime at this temperature. The operating range of -55°C to 105°C is identical for both components.

Q: What is the significance of the lead spacing specification?

A: Lead spacing of 0.295" (7.50 mm) determines PCB hole pattern compatibility. Both parts have identical lead spacing, ensuring they fit the same PCB footprint without modification.

Q: Why is the ESR specification provided for SEK331M100ST but not for ECA-2AHG331?

A: ESR (Equivalent Series Resistance) is a manufacturer-specific parameter. The SEK331M100ST datasheet documents 400 mOhm ESR, while the ECA-2AHG331 documentation emphasizes ripple current ratings instead. Both specifications serve similar purposes in characterizing capacitor performance under AC conditions.

Q: Are both parts RoHS3 compliant?

A: Yes. Both SEK331M100ST and ECA-2AHG331 are ROHS3 Compliant and REACH Unaffected, meeting current environmental and supply chain regulations.

Q: What is the difference between ripple current at 120 Hz and 100 kHz?

A: Ripple current specifications at different frequencies characterize the capacitor's ability to handle AC current superimposed on DC voltage. The ECA-2AHG331 specifies 540 mA @ 120 Hz (low frequency) and 810 mA @ 100 kHz (high frequency), indicating performance across the typical operating spectrum of power supply applications.