SEK101M350ST Equivalent & Substitute Parts Reference

Part Overview

The SEK101M350ST is a 100 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 serves general-purpose applications requiring stable capacitance performance across industrial temperature ranges. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained, enabling procurement flexibility and supply chain continuity.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Capacitance	100	µF	Critical - Must match exactly
Voltage - Rated	350	V	Critical - Must match exactly
Tolerance	±20%	%	Critical - Must match or be tighter
Operating Temperature Range	-40°C ~ 105°C	°C	Critical - Must encompass or match
Polarization	Polar	-	Critical - Must match
Mounting Type	Through Hole	-	Critical - Must match
Package / Case	Radial, Can	-	Critical - Must match
Lead Spacing	0.295" (7.50mm)	in (mm)	Critical - Must match for PCB compatibility
Size / Dimension (Diameter)	0.709" (18.00mm)	in (mm)	Important - Physical fit consideration
Height - Seated (Max)	1.654" (42.00mm)	in (mm)	Important - Clearance and form factor
RoHS Status	ROHS3 Compliant	-	Important - Regulatory compliance

Substitute Part Grouping Explanation

Substitute parts for the SEK101M350ST are identified based on strict equivalence of the following critical parameters:

Electrical Equivalence Requirements:

Capacitance value: 100 µF (exact match)
Rated voltage: 350 V (exact match)
Tolerance: ±20% or tighter
Operating temperature range: -40°C to 105°C minimum
Polarization: Polar (electrolytic)

Mechanical Compatibility Requirements:

Mounting type: Through Hole
Package configuration: Radial, Can
Lead spacing: 0.295" (7.50mm) pitch
Can diameter: 0.709" (18.00mm)
Height: Must fit within application space constraints

Regulatory Compliance:

RoHS3 Compliant status
REACH Unaffected classification

The EKXG351ELL101MM25S from Chemi-Con satisfies all critical electrical and mechanical parameters. Physical height differs (0.984" vs. 1.654"), which represents a design improvement allowing installation in space-constrained applications while maintaining all electrical specifications.

Parameter Comparison

Parameter	SEK101M350ST (CDE)	EKXG351ELL101MM25S (Chemi-Con)	Match Status
Capacitance	100 µF	100 µF	Exact Match
Voltage - Rated	350 V	350 V	Exact Match
Tolerance	±20%	±20%	Exact Match
Operating Temperature	-40°C ~ 105°C	-40°C ~ 105°C	Exact Match
Polarization	Polar	Polar	Exact Match
Mounting Type	Through Hole	Through Hole	Exact Match
Package / Case	Radial, Can	Radial, Can	Exact Match
Lead Spacing	0.295" (7.50mm)	0.295" (7.50mm)	Exact Match
Can Diameter	0.709" (18.00mm)	0.709" (18.00mm)	Exact Match
Height - Seated (Max)	1.654" (42.00mm)	0.984" (25.00mm)	Substitute is Shorter
Lifetime @ Temp.	2000 Hrs @ 105°C	10000 Hrs @ 105°C	Substitute Exceeds
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Exact Match
REACH Status	REACH Unaffected	REACH Unaffected	Exact Match

Engineering Selection Recommendations

SEK101M350ST (Cornell Dubilier Electronics):

Select when original equipment manufacturer specification explicitly requires CDE components
Active product status with established supply chain
ROHS3 Compliant and REACH Unaffected
Standard height profile (1.654") suitable for conventional PCB layouts

EKXG351ELL101MM25S (Chemi-Con):

Select when space-constrained applications require reduced height (0.984" vs. 1.654")
Active product status with higher inventory availability (2722 Pcs vs. 829 Pcs)
ROHS3 Compliant and REACH Unaffected
Extended lifetime rating (10000 Hrs @ 105°C vs. 2000 Hrs @ 105°C) provides enhanced reliability margin
Identical electrical performance and mechanical compatibility on PCB footprint

Both parts maintain full regulatory compliance and are suitable for direct substitution in general-purpose applications where the specified electrical and mechanical parameters are required.

Frequently Asked Questions (FAQ)

Q: Can EKXG351ELL101MM25S replace SEK101M350ST in existing designs?

A: Yes. Both parts share identical capacitance (100 µF), voltage rating (350 V), tolerance (±20%), operating temperature range (-40°C to 105°C), polarization (Polar), mounting type (Through Hole), package configuration (Radial, Can), and lead spacing (0.295" / 7.50mm). The substitute part is physically shorter (0.984" vs. 1.654"), which is compatible with PCB layouts designed for the original part and beneficial in space-constrained applications.

Q: What is the primary difference between these two parts?

A: The primary differences are physical height and lifetime rating. The EKXG351ELL101MM25S is 0.670" shorter and provides 10000 hours lifetime at 105°C compared to 2000 hours for the SEK101M350ST. All electrical specifications and mechanical compatibility parameters are identical.

Q: Are both parts RoHS3 compliant?

A: Yes. Both SEK101M350ST and EKXG351ELL101MM25S are ROHS3 Compliant and REACH Unaffected, meeting current regulatory requirements for electronic components.

Q: Does the height difference affect electrical performance?

A: No. Height is a physical form factor parameter only. Electrical performance, including capacitance, voltage rating, tolerance, ESR characteristics, and temperature stability, is independent of can height.

Q: Which part should be selected for new designs?

A: Selection depends on application requirements. For space-constrained designs, EKXG351ELL101MM25S offers superior height efficiency. For designs with existing height clearance, either part is suitable. The extended lifetime of EKXG351ELL101MM25S (10000 Hrs @ 105°C) provides additional reliability margin in high-temperature environments.

Q: Are the lead spacings identical?

A: Yes. Both parts have 0.295" (7.50mm) lead spacing, ensuring identical PCB footprint compatibility and direct substitution capability.

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