SEK100M350ST Equivalent & Substitute Parts Reference

Part Overview

The SEK100M350ST is a 10 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 designed for general-purpose applications requiring polar capacitive energy storage at moderate voltage levels. The part is ROHS3 compliant and REACH unaffected, meeting current environmental standards.

Substitute parts are identified when equivalent capacitance and voltage ratings are available from alternative manufacturers, or when higher voltage ratings provide direct functional replacement in the same physical form factor. The SEK100M350ST has four qualified substitute options that maintain the core electrical specifications while offering variations in lifetime ratings and ripple current performance.

Key Parameters

Parameter	Value	Unit
Capacitance	10	µF
Voltage - Rated	350	V
Tolerance	±20%	-
Polarization	Polar	-
Operating Temperature Range	-40°C ~ 105°C	-
Lifetime @ 105°C	2000	Hrs
Lead Spacing	5.00	mm
Diameter	10.00	mm
Height - Seated (Max)	21.00	mm
Mounting Type	Through Hole	-
Package / Case	Radial, Can	-

Substitute Part Grouping Explanation

Substitution eligibility for the SEK100M350ST is determined by the following criteria:

Primary Substitution Criteria:

Capacitance: 10 µF (exact match required)
Tolerance: ±20% (exact match required)
Polarization: Polar (exact match required)
Lead Spacing: 5.00 mm (exact match required)
Diameter: 10.00 mm (exact match required)
Mounting Type: Through Hole (exact match required)
Package / Case: Radial, Can (exact match required)

Secondary Substitution Criteria (Allowable Variations):

Voltage - Rated: 350 V or higher (equal or greater voltage rating)
Lifetime @ 105°C: 2000 Hrs or greater (equal or greater lifetime)
Height - Seated (Max): Up to 21.50 mm (minor physical variation acceptable)
Operating Temperature Range: -40°C ~ 105°C (exact match required)

All four substitute parts meet these criteria. Substitutes with higher voltage ratings (400 V or 450 V) provide enhanced voltage margin and are direct functional replacements. Substitutes with extended lifetime ratings (5000 Hrs, 8000 Hrs, or 20000 Hrs) offer improved reliability characteristics.

Parameter Comparison

Parameter	SEK100M350ST (Main)	UCS2V100MPD	ESG106M400AH4AA	UCS2G100MPD	EKXF451ELL100MJ20S
Manufacturer	Cornell Dubilier Electronics	Nichicon	KEMET	Nichicon	Chemi-Con
Capacitance	10 µF	10 µF	10 µF	10 µF	10 µF
Tolerance	±20%	±20%	±20%	±20%	±20%
Voltage - Rated	350 V	350 V	400 V	400 V	450 V
Lifetime @ 105°C	2000 Hrs	8000 Hrs	5000 Hrs	8000 Hrs	20000 Hrs
Operating Temperature	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C
Lead Spacing	5.00 mm	5.00 mm	5.00 mm	5.00 mm	5.00 mm
Diameter	10.00 mm	10.00 mm	10.00 mm	10.00 mm	10.00 mm
Height - Seated (Max)	21.00 mm	21.50 mm	21.00 mm	21.50 mm	21.50 mm
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Can	Radial, Can	Radial, Can	Radial, Can	Radial, Can
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

UCS2V100MPD (Nichicon)

The UCS2V100MPD maintains identical voltage rating (350 V) and physical dimensions to the SEK100M350ST. This part is the closest direct equivalent, offering 4× extended lifetime (8000 Hrs vs. 2000 Hrs at 105°C). All compliance certifications match: ROHS3 compliant, REACH unaffected, Active product status. Height increases by 0.5 mm (21.50 mm vs. 21.00 mm), which remains within acceptable PCB layout tolerances for through-hole radial capacitors.

ESG106M400AH4AA (KEMET)

The ESG106M400AH4AA provides a 50 V voltage margin increase (400 V vs. 350 V) while maintaining identical physical footprint and height (21.00 mm). Lifetime rating is 5000 Hrs at 105°C, providing 2.5× improvement over the main part. ROHS3 compliant, REACH unaffected, Active product status. This part is suitable for applications requiring enhanced voltage headroom.

UCS2G100MPD (Nichicon)

The UCS2G100MPD offers 50 V voltage margin increase (400 V vs. 350 V) and 4× extended lifetime (8000 Hrs vs. 2000 Hrs at 105°C). Height increases to 21.50 mm. ROHS3 compliant, REACH unaffected, Active product status. This part combines voltage upgrade with extended reliability characteristics.

EKXF451ELL100MJ20S (Chemi-Con)

The EKXF451ELL100MJ20S provides the highest voltage rating (450 V) and longest lifetime (20000 Hrs at 105°C), representing 10× improvement in thermal life. Height increases to 21.50 mm. ROHS3 compliant, REACH unaffected, Active product status. This part is optimal for demanding applications requiring maximum reliability margin.

All substitute parts are Active status products with current manufacturing support and full environmental compliance certification.

Frequently Asked Questions (FAQ)

Q: Can UCS2V100MPD replace SEK100M350ST in a 1:1 substitution?

A: Yes. The UCS2V100MPD is a direct equivalent with identical voltage rating (350 V), capacitance (10 µF), tolerance (±20%), and physical footprint (10.00 mm diameter, 5.00 mm lead spacing). The height increases by 0.5 mm (21.50 mm vs. 21.00 mm), which is acceptable for through-hole radial capacitor PCB layouts. Lifetime extends from 2000 Hrs to 8000 Hrs at 105°C.

Q: What is the difference between the 350 V and 400 V substitute options?

A: The 350 V option (UCS2V100MPD) maintains the original voltage specification with extended lifetime. The 400 V options (ESG106M400AH4AA and UCS2G100MPD) provide 50 V additional voltage margin, allowing operation in circuits with higher transient voltage conditions. Both 400 V parts fit the same physical footprint. Selection depends on circuit voltage requirements and desired reliability margin.

Q: Why does EKXF451ELL100MJ20S have a 20000 Hrs lifetime rating?

A: Lifetime rating is determined by the capacitor's internal construction, electrolyte chemistry, and thermal design. The EKXF451ELL100MJ20S from Chemi-Con uses a formulation and construction that extends thermal life to 20000 Hrs at 105°C, compared to 2000 Hrs for the SEK100M350ST. This represents a 10× improvement in rated operational life under maximum temperature conditions.

Q: Are all substitute parts through-hole radial capacitors?

A: Yes. All substitute parts maintain the through-hole radial, can package configuration with identical lead spacing (5.00 mm) and diameter (10.00 mm). Height variations are minor (21.00 mm to 21.50 mm) and do not affect PCB compatibility for standard through-hole layouts.

Q: Do all parts meet current environmental compliance standards?

A: Yes. All parts listed—SEK100M350ST, UCS2V100MPD, ESG106M400AH4AA, UCS2G100MPD, and EKXF451ELL100MJ20S—are ROHS3 compliant and REACH unaffected. All are Active product status with current manufacturing support.

Q: What is the ripple current difference between the main part and substitutes?

A: The SEK100M350ST specifies 95 mA @ 120 Hz and 171 mA @ 10 kHz. Substitute parts vary: UCS2V100MPD and UCS2G100MPD offer higher ripple current capability (175 mA @ 120 Hz, 350 mA @ 100 kHz). ESG106M400AH4AA provides 100 mA @ 120 Hz and 160 mA @ 10 kHz. EKXF451ELL100MJ20S specifies 92 mA @ 120 Hz and 230 mA @ 100 kHz. Selection should match circuit ripple current requirements.

Q: Can a higher voltage-rated capacitor be used in place of the SEK100M350ST?

A: Yes. A 400 V or 450 V rated capacitor can be used in a 350 V circuit. The higher voltage rating provides additional safety margin and does not degrade circuit performance. The capacitance value (10 µF) and tolerance (±20%) remain the same, ensuring equivalent electrical behavior.

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