SK331M100ST Equivalent & Substitute Parts Reference

Part Overview

The SK331M100ST is a 330 µF, 100 V aluminum electrolytic capacitor in radial, can package manufactured by Cornell Dubilier Electronics (CDE). This component is classified as Active product status and serves general-purpose applications requiring through-hole mounting. The SK series capacitor features a rated lifetime of 2000 hours at 85°C with an equivalent series resistance (ESR) of 320 mOhm at 120 Hz. Equivalent and substitute parts are necessary when SK331M100ST inventory is unavailable, when design requirements demand extended operational lifetime, improved thermal performance, or when automotive-grade reliability certifications are required.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Capacitance	330	µF	Must match exactly
Voltage Rating	100	V	Must match or exceed
Tolerance	±20%	%	Must match or be tighter
Polarization	Polar	—	Must match
Mounting Type	Through Hole	—	Must match
Package Type	Radial, Can	—	Must match
Lead Spacing	0.295" (7.50 mm)	in (mm)	Must match for PCB compatibility
Diameter	0.630" (16.00 mm)	in (mm)	Must match for mechanical fit
Height (Seated Max)	1.063" (27.00 mm)	in (mm)	Must match or be shorter
Operating Temperature Range	-40°C to 85°C	°C	Substitute range must encompass or exceed
Lifetime @ Temperature	2000 Hrs @ 85°C	Hrs @ °C	Substitute must meet or exceed
RoHS Status	ROHS3 Compliant	—	Must maintain compliance

Substitute Part Grouping Explanation

Substitution eligibility for the SK331M100ST is determined by strict adherence to the following core parameters:

Mandatory Matching Parameters:

Capacitance: 330 µF (exact match required)
Voltage Rating: 100 V (exact match required)
Tolerance: ±20% (exact match required)
Polarization: Polar (exact match required)
Mounting Type: Through Hole (exact match required)
Package Type: Radial, Can (exact match required)
Lead Spacing: 0.295" (7.50 mm) (exact match required)
Diameter: 0.630" (16.00 mm) (exact match required)
Height (Seated Max): 1.063" (27.00 mm) or shorter (physical fit requirement)

Allowable Variation Parameters:

Operating Temperature Range: Substitute range must encompass the original -40°C to 85°C specification
Lifetime @ Temperature: Substitute must meet or exceed 2000 Hrs @ 85°C
ESR and Impedance: Lower values indicate improved performance; higher values are acceptable if other parameters are met
Ripple Current: Higher values indicate improved performance; lower values are acceptable if other parameters are met
RoHS Status: Must maintain ROHS3 Compliant status

All substitute parts listed below satisfy these mandatory matching criteria and represent direct functional equivalents for the SK331M100ST in general-purpose applications.

Parameter Comparison

Parameter	SK331M100ST (CDE)	EKY-101ELL331ML25S (Chemi-Con)	100YXJ330M16X25 (Rubycon)	ECA-2AHG331 (Panasonic)	EGXF101ELL331ML25S (Chemi-Con)	EKYB101ELL331ML25S (Chemi-Con)	EKZE101ELL331ML25S (Chemi-Con)	UPS2A331MHD (Nichicon)
Capacitance	330 µF	330 µF	330 µF	330 µF	330 µF	330 µF	330 µF	330 µF
Voltage Rating	100 V	100 V	100 V	100 V	100 V	100 V	100 V	100 V
Tolerance	±20%	±20%	±20%	±20%	±20%	±20%	±20%	±20%
Lead Spacing	0.295" (7.50 mm)	0.295" (7.50 mm)	0.295" (7.50 mm)	0.295" (7.50 mm)	0.295" (7.50 mm)	0.295" (7.50 mm)	0.295" (7.50 mm)	0.295" (7.50 mm)
Diameter	0.630" (16.00 mm)	0.630" (16.00 mm)	0.630" (16.00 mm)	0.630" (16.00 mm)	0.630" (16.00 mm)	0.630" (16.00 mm)	0.630" (16.00 mm)	0.630" (16.00 mm)
Height (Seated Max)	1.063" (27.00 mm)	1.043" (26.50 mm)	1.063" (27.00 mm)	1.063" (27.00 mm)	1.043" (26.50 mm)	1.043" (26.50 mm)	1.043" (26.50 mm)	1.063" (27.00 mm)
Operating Temperature Range	-40°C to 85°C	-40°C to 105°C	-40°C to 105°C	-55°C to 105°C	-40°C to 125°C	-40°C to 105°C	-40°C to 105°C	-55°C to 105°C
Lifetime @ Temperature	2000 Hrs @ 85°C	10000 Hrs @ 105°C	10000 Hrs @ 105°C	2000 Hrs @ 105°C	3000 Hrs @ 125°C	10000 Hrs @ 105°C	5000 Hrs @ 105°C	3000 Hrs @ 105°C
ESR @ Specified Frequency	320 mOhm @ 120 Hz	Not specified	Not specified	Not specified	57 mOhm @ 100 kHz	Not specified	Not specified	Not specified
Impedance	Not specified	38 mOhms	44 mOhms	Not specified	Not specified	28 mOhms	38 mOhms	90 mOhms
Ripple Current @ 120 Hz	860 mA	850 mA	1.547 A	540 mA	1.095 A	1.125 A	850 mA	766.8 mA
Ripple Current @ High Frequency	1.118 A @ 1 kHz	1.7 A @ 100 kHz	2.21 A @ 100 kHz	810 mA @ 100 kHz	Not specified	2.25 A @ 100 kHz	1.7 A @ 100 kHz	1.08 A @ 100 kHz
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package Type	Radial, Can	Radial, Can	Radial, Can	Radial, Can	Radial, Can	Radial, Can	Radial, Can	Radial, Can
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active	Active	Not For New Designs

Engineering Selection Recommendations

Primary Substitutes (Active Product Status, Extended Lifetime):

The following parts are recommended as primary substitutes for new designs and ongoing production:

EKY-101ELL331ML25S (Chemi-Con KY Series) — This substitute provides 10000 hours lifetime at 105°C, representing a 5× improvement over the SK331M100ST baseline. Operating temperature range extends to 105°C. ROHS3 compliant. Impedance of 38 mOhms supports high-frequency ripple current applications. Active product status ensures long-term availability.

100YXJ330M16X25 (Rubycon YXJ Series) — This substitute delivers 10000 hours lifetime at 105°C with the highest ripple current performance (2.21 A @ 100 kHz). Operating temperature extends to 105°C. ROHS3 compliant. Impedance of 44 mOhms. Active product status. Height matches original specification at 1.063".

EKYB101ELL331ML25S (Chemi-Con KYB Series) — This substitute provides 10000 hours lifetime at 105°C with the lowest impedance (28 mOhms) among all listed alternatives, enabling superior high-frequency performance (2.25 A @ 100 kHz). Operating temperature range extends to 105°C. ROHS3 compliant. Active product status.

Secondary Substitutes (Extended Temperature Range or Automotive Certification):

EGXF101ELL331ML25S (Chemi-Con GXF Series) — This substitute is rated for automotive applications with AEC-Q200 certification. Operating temperature extends to 125°C with 3000 hours lifetime at 125°C. ESR of 57 mOhm @ 100 kHz. RoHS compliant. Suitable for automotive and high-temperature environments. Active product status.

ECA-2AHG331 (Panasonic NHG-A Series) — This substitute extends operating temperature to -55°C to 105°C, providing the widest low-temperature specification. Lifetime of 2000 hours at 105°C matches the original at 85°C. ROHS3 compliant. Active product status. Suitable for wide-temperature-range applications.

EKZE101ELL331ML25S (Chemi-Con KZE Series) — This substitute provides 5000 hours lifetime at 105°C, intermediate performance between baseline and extended-life options. Operating temperature extends to 105°C. Impedance of 38 mOhms. ROHS3 compliant. Active product status.

Legacy/Obsolescence Consideration:

UPS2A331MHD (Nichicon UPS Series) — Product status is "Not For New Designs." This part is listed for reference only in legacy system maintenance. Lifetime of 3000 hours at 105°C. ROHS3 compliant. Impedance of 90 mOhms indicates higher ESR. Use only for replacement in existing equipment where original part is unavailable.

Frequently Asked Questions (FAQ)

Q1: Can I substitute the SK331M100ST with any of these parts in my existing design?

A: Yes, all listed substitute parts match the mandatory electrical and mechanical parameters: 330 µF capacitance, 100 V voltage rating, ±20% tolerance, through-hole radial can package, 0.295" lead spacing, 0.630" diameter, and 1.063" maximum height (or shorter). Physical PCB fit and electrical performance are preserved. However, verify that your circuit design does not depend on the specific ESR or ripple current characteristics of the original part.

Q2: What is the key difference between the SK331M100ST and the substitute parts?

A: The primary difference is operational lifetime and temperature rating. The SK331M100ST is rated for 2000 hours at 85°C. Most substitutes extend this to 10000 hours at 105°C (EKY-101ELL331ML25S, 100YXJ330M16X25, EKYB101ELL331ML25S), providing significantly longer service life in elevated-temperature environments. EGXF101ELL331ML25S extends to 125°C for automotive applications. Secondary differences include impedance and ripple current capacity, which improve in most substitutes.

Q3: Which substitute should I choose for a new design?

A: For general-purpose applications with standard thermal requirements, select EKYB101ELL331ML25S (lowest impedance at 28 mOhms) or 100YXJ330M16X25 (highest ripple current at 2.21 A @ 100 kHz). Both offer 10000-hour lifetime at 105°C and active product status. For automotive applications, select EGXF101ELL331ML25S with AEC-Q200 certification. For wide-temperature-range requirements, select ECA-2AHG331 (-55°C to 105°C).

Q4: Are all substitute parts RoHS compliant?

A: Yes, all substitute parts are RoHS compliant. Seven of eight parts carry ROHS3 Compliant status. EGXF101ELL331ML25S carries RoHS Compliant status. Both designations satisfy RoHS Directive requirements.

Q5: Can I use UPS2A331MHD as a substitute?

A: UPS2A331MHD is electrically and mechanically compatible but carries "Not For New Designs" product status. Use this part only for replacement in legacy equipment or when other substitutes are unavailable. For new designs, select from the active product status alternatives.

Q6: What does impedance mean, and why does it matter?

A: Impedance is the effective resistance of the capacitor at a specified frequency, typically 100 kHz. Lower impedance indicates better high-frequency performance and lower voltage ripple. EKYB101ELL331ML25S (28 mOhms) provides superior high-frequency performance compared to the SK331M100ST (320 mOhm @ 120 Hz). Higher impedance parts like UPS2A331MHD (90 mOhms) are acceptable for low-frequency applications but less suitable for switching power supplies.

Q7: Do all substitute parts fit in the same PCB footprint?

A: Yes, all substitute parts share identical lead spacing (0.295" / 7.50 mm) and diameter (0.630" / 16.00 mm). Most have identical or shorter seated height (1.043" or 1.063"). Verify clearance in your specific PCB layout, particularly if components are densely packed. Shorter-height parts (1.043") provide additional clearance margin.

Q8: What is the difference between Chemi-Con KY, KYB, KZE, and GXF series?

A: These represent different product lines within Chemi-Con's aluminum electrolytic capacitor portfolio. KY series: 10000 Hrs @ 105°C, general purpose. KYB series: 10000 Hrs @ 105°C, lowest impedance (28 mOhms). KZE series: 5000 Hrs @ 105°C, intermediate performance. GXF series: 3000 Hrs @ 125°C, automotive-grade with AEC-Q200 certification. Selection depends on lifetime, temperature, and performance requirements.

Q9: Can I use a substitute with higher voltage rating, such as 160 V instead of 100 V?

A: No. The substitute parts listed are all rated for exactly 100 V. Using a higher-voltage-rated capacitor changes the physical dimensions, lead spacing, and electrical characteristics, violating the substitution criteria. Select only from parts with 100 V rating.

Q10: What is ROHS3 Compliant status?

A: ROHS3 Compliant indicates compliance with the Restriction of Hazardous Substances Directive (RoHS 3 / 2011/65/EU as amended by 2015/863/EU). This certification confirms the part contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE) above specified thresholds. All listed substitutes meet this requirement.

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