SEK2R2M350ST Equivalent & Substitute Parts Reference

Part Overview

The SEK2R2M350ST is a 2.2 µF, 350 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 suitable for general-purpose applications requiring stable capacitance and voltage ratings across extended operating temperature ranges from -40°C to 105°C.

Substitute parts are identified when equivalent electrical and mechanical parameters align with the main part's specifications, enabling direct functional replacement in circuit designs. The primary substitute listed maintains the same capacitance and tolerance values while offering enhanced lifetime characteristics and higher voltage rating.

Substiute Parts

SEK2R2M350ST

Cornell Dubilier Electronics (CDE)In Stock: 670SEK2R2M350ST Datasheet

Current PartRFQ

400LLE2R2MEFC8X9

RubyconIn Stock: 11972400LLE2R2MEFC8X9 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SEK2R2M350ST is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Capacitance value: 2.2 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Voltage rating: Equal to or greater than 350 V
• Polarization: Polar (exact match required)
• Operating temperature range: Must encompass -40°C to 105°C

Mechanical Compatibility Requirements:

• Mounting type: Through Hole (exact match required)
• Package / Case: Radial, Can (exact match required)
• Lead spacing: 0.138" (3.50mm) (exact match required)

Compliance Requirements:

• RoHS3 Compliant
• REACH Unaffected
• Moisture Sensitivity Level: 1 (Unlimited)

The substitute part 400LLE2R2MEFC8X9 satisfies all electrical and mechanical compatibility criteria. Physical dimensions (diameter and height) may vary within acceptable PCB layout tolerances for radial through-hole components.

Parameter Comparison

Engineering Selection Recommendations

For Active Product Designs: The SEK2R2M350ST (CDE) is the primary selection for new circuit designs. This part maintains Active product status, ensuring long-term availability and manufacturer support. The component is fully compliant with RoHS3 and REACH requirements.

For Existing Design Continuity or Inventory Constraints: The 400LLE2R2MEFC8X9 (Rubycon) serves as a functional equivalent when SEK2R2M350ST availability is limited. This substitute provides superior lifetime characteristics (12000 Hrs @ 105°C versus 2000 Hrs @ 105°C) and higher voltage rating (400 V versus 350 V), offering enhanced reliability margins in the application circuit.

Product Status Consideration: The substitute part carries "Not For New Designs" status. This designation reflects manufacturer discontinuation plans and should be evaluated against project lifecycle requirements. For applications with extended service life expectations, the Active status of the main part is preferred.

Compliance Verification: Both parts satisfy RoHS3 Compliant, REACH Unaffected, and MSL 1 (Unlimited) requirements, enabling direct substitution in regulated manufacturing environments without additional compliance documentation.

Physical Layout Verification: The substitute part features reduced physical dimensions (0.315" diameter and 0.433" height versus 0.394" diameter and 0.453" height). PCB layout verification is required to confirm adequate clearance around the component mounting location, though lead spacing remains identical at 0.138" (3.50mm).

Frequently Asked Questions (FAQ)

Q: Can the 400LLE2R2MEFC8X9 directly replace the SEK2R2M350ST in existing circuit boards?

A: Yes, direct replacement is electrically and mechanically compatible. Both parts share identical capacitance (2.2 µF), tolerance (±20%), polarization (Polar), operating temperature range (-40°C to 105°C), lead spacing (0.138" / 3.50mm), mounting type (Through Hole), and package configuration (Radial, Can). The substitute's higher voltage rating (400 V) and extended lifetime (12000 Hrs @ 105°C) provide additional design margin. Physical dimensions are slightly smaller, requiring verification that PCB layout accommodates the reduced can diameter (0.315" versus 0.394").

Q: What is the significance of the "Not For New Designs" status on the substitute part?

A: This designation indicates that Rubycon has discontinued or plans to discontinue the 400LLE2R2MEFC8X9 series. While the part remains functionally equivalent and suitable for replacement in existing designs, it should not be selected for new product development where long-term component availability is required. The SEK2R2M350ST (Active status) is the appropriate choice for new designs.

Q: Are there electrical performance differences between these parts?

A: Both parts maintain identical capacitance (2.2 µF) and tolerance (±20%). Ripple current specifications are equivalent at 120 Hz (35 mA main part, 36 mA substitute). The substitute provides superior lifetime at rated temperature (12000 Hrs versus 2000 Hrs @ 105°C) and higher voltage rating (400 V versus 350 V). ESR data is not provided for the substitute part.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both the SEK2R2M350ST and 400LLE2R2MEFC8X9 are RoHS3 Compliant, REACH Unaffected, and classified as MSL 1 (Unlimited). No additional compliance documentation is required for substitution in regulated manufacturing environments.

Q: What physical considerations apply when substituting these parts?

A: Lead spacing remains constant at 0.138" (3.50mm), ensuring PCB footprint compatibility. The substitute part is physically smaller: 0.315" diameter (versus 0.394") and 0.433" height (versus 0.453"). Verify that the reduced can diameter does not create clearance conflicts with adjacent components or PCB features. Height reduction is negligible for most applications.

Q: Which part should be selected for a design with a 10-year service life requirement?

A: The SEK2R2M350ST is the appropriate selection. Its Active product status ensures manufacturer support and availability throughout the extended service period. The substitute's "Not For New Designs" status and limited lifetime (2000 Hrs @ 105°C for the main part, though the substitute offers 12000 Hrs) require careful evaluation against specific application duty cycles and thermal conditions.