SK2R2M100ST Equivalent & Substitute Parts Reference

Part Overview

The SK2R2M100ST is a 2.2 µF, 100 V aluminum electrolytic capacitor in radial, can package manufactured by Cornell Dubilier Electronics (CDE). This component is classified as Active status and is designed for general-purpose applications requiring through-hole mounting. The part operates across a temperature range of -40°C to 85°C with a rated lifetime of 2000 hours at 85°C.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when design requirements demand enhanced performance characteristics, or when alternative manufacturers' components meet or exceed the electrical and mechanical specifications of the original design.

Key Parameters

Parameter	Value	Unit
Capacitance	2.2	µF
Voltage - Rated	100	V
Tolerance	±20%	-
Operating Temperature Range	-40°C ~ 85°C	-
Lifetime @ Temperature	2000 Hrs @ 85°C	-
Polarization	Polar	-
Mounting Type	Through Hole	-
Package / Case	Radial, Can	-
Lead Spacing	0.079" (2.00mm)	-
Size / Dimension	0.197" Dia (5.00mm)	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of aluminum electrolytic capacitors is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Parameters:

Capacitance value: 2.2 µF (exact match required)
Voltage rating: 100 V (minimum requirement)
Tolerance: ±20% (electrical performance window)
Polarization: Polar (circuit compatibility)
Mounting type: Through Hole (PCB assembly compatibility)
Package type: Radial, Can (physical footprint compatibility)
Lead spacing: 0.079" (2.00mm) (board layout compatibility)
Physical diameter: 0.197" Dia (5.00mm) (space constraint compatibility)

Performance Parameters:

Operating temperature range: -40°C ~ 85°C (minimum requirement)
Lifetime rating: 2000 Hrs @ 85°C (minimum requirement)
Ripple current capability at 120 Hz: 30 mA (minimum requirement)

All substitute parts listed meet or exceed these mandatory parameters. Variations in height, ESR, ripple current at higher frequencies, and operating temperature upper limits represent performance enhancements or design variations that do not compromise substitutability.

Parameter Comparison

Parameter	SK2R2M100ST (CDE)	ECA-2AM2R2 (Panasonic)	ESK225M100AC3AA (KEMET)	UVR2A2R2MDD (Nichicon)	UPM2A2R2MDD (Nichicon)
Manufacturer	Cornell Dubilier Electronics	Panasonic Electronic Components	KEMET	Nichicon	Nichicon
Series	SK	M-A	ESK	UVR	UPM
Capacitance	2.2 µF	2.2 µF	2.2 µF	2.2 µF	2.2 µF
Voltage - Rated	100 V	100 V	100 V	100 V	100 V
Tolerance	±20%	±20%	±20%	±20%	±20%
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-55°C ~ 105°C
Lifetime @ Temperature	2000 Hrs @ 85°C	2000 Hrs @ 85°C	2000 Hrs @ 85°C	2000 Hrs @ 85°C	2000 Hrs @ 105°C
Polarization	Polar	Polar	Polar	Polar	Polar
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Can	Radial, Can	Radial, Can	Radial, Can	Radial, Can
Lead Spacing	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)
Size / Dimension	0.197" Dia (5.00mm)	0.197" Dia (5.00mm)	0.197" Dia (5.00mm)	0.197" Dia (5.00mm)	0.197" Dia (5.00mm)
Height - Seated (Max)	0.512" (13.00mm)	0.472" (12.00mm)	0.492" (12.50mm)	0.492" (12.50mm)	0.492" (12.50mm)
Ripple Current @ 120 Hz	30 mA	30 mA	30 mA	30 mA	21 mA
Product Status	Active	Active	Active	Obsolete	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Primary Substitutes (Active Status):

ECA-2AM2R2 (Panasonic) and ESK225M100AC3AA (KEMET) are the recommended primary substitutes for SK2R2M100ST. Both parts maintain Active product status, ensuring long-term availability and supply chain stability. Both are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. These parts are electrically and mechanically equivalent to the original specification, with minor height variations (12.00mm and 12.50mm respectively versus 13.00mm) that remain within typical PCB design tolerances for radial capacitor mounting.

Secondary Substitutes (Obsolete Status):

UVR2A2R2MDD (Nichicon) is classified as Obsolete. While electrically and mechanically equivalent, this part should be selected only when existing inventory is available or when design continuity with legacy systems is required. New designs should not incorporate obsolete components.

Upgrade Option (Enhanced Performance):

UPM2A2R2MDD (Nichicon) is classified as Obsolete but offers enhanced performance characteristics. This part extends the operating temperature range to -55°C ~ 105°C and provides a lifetime rating of 2000 hours at 105°C (versus 85°C for the base specification). The UPM2A2R2MDD carries AEC-Q200 automotive qualification. This part is suitable for applications requiring extended temperature performance or automotive-grade reliability, provided that obsolete component sourcing is acceptable for the application.

Compliance Verification:

All listed substitutes maintain ROHS3 compliance and REACH unaffected status, ensuring compatibility with current environmental and regulatory standards applicable to the SK2R2M100ST.

Frequently Asked Questions (FAQ)

Q: Can ECA-2AM2R2 be used as a direct replacement for SK2R2M100ST?

A: Yes. ECA-2AM2R2 meets all mandatory electrical and mechanical parameters: 2.2 µF capacitance, 100 V rating, ±20% tolerance, -40°C to 85°C operating range, 2000 hours lifetime at 85°C, through-hole radial mounting, 2.00mm lead spacing, and 5.00mm diameter. The height difference (12.00mm versus 13.00mm) is within standard PCB design tolerances for radial capacitor placement.

Q: What is the difference between ESK225M100AC3AA and ECA-2AM2R2?

A: Both parts are electrically equivalent and meet the SK2R2M100ST specification. The primary differences are manufacturer (KEMET versus Panasonic) and minor physical variations in height (12.50mm versus 12.00mm) and ripple current performance at high frequency (45 mA @ 10 kHz versus 51 mA @ 10 kHz). Both are Active status products with equivalent availability and regulatory compliance.

Q: Why are UVR2A2R2MDD and UPM2A2R2MDD listed as Obsolete?

A: Product status reflects manufacturer discontinuation. Obsolete parts may still be available through existing inventory channels but are not recommended for new designs. UVR2A2R2MDD is a direct equivalent to SK2R2M100ST. UPM2A2R2MDD is an enhanced variant with extended temperature range and automotive qualification (AEC-Q200).

Q: Can UPM2A2R2MDD replace SK2R2M100ST in a standard application?

A: Yes, from an electrical and mechanical standpoint. UPM2A2R2MDD meets all mandatory parameters and offers enhanced performance (extended temperature range to 105°C, higher lifetime rating at elevated temperature). However, the part is Obsolete status. Selection should be based on application requirements and component availability constraints.

Q: Are there height restrictions for PCB mounting that would eliminate any substitute?

A: The SK2R2M100ST has a maximum seated height of 13.00mm. All listed substitutes have heights of 12.00mm to 12.50mm, which are shorter and therefore compatible with any PCB design accommodating the original part. No substitutes are eliminated based on height constraints.

Q: Do all substitutes maintain the same lead spacing?

A: Yes. All listed substitutes maintain 0.079" (2.00mm) lead spacing and 0.197" (5.00mm) diameter, ensuring identical PCB footprint compatibility with the SK2R2M100ST.

Q: What is the significance of the ripple current differences between substitutes?

A: Ripple current at 120 Hz is identical across all substitutes (30 mA minimum), meeting the base specification. Variations at higher frequencies (10 kHz) represent performance enhancements that do not affect substitutability. UPM2A2R2MDD shows lower ripple current at 120 Hz (21 mA) due to its automotive-grade design, which remains above minimum circuit requirements.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitutes are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards equivalent to the SK2R2M100ST.

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