SK2R2M350ST Equivalent & Substitute Parts Reference

Part Overview

The SK2R2M350ST is a 2.2 µF, 350 V aluminum electrolytic capacitor in radial, can package manufactured by Cornell Dubilier Electronics (CDE). This component is classified as Active product status and is designed for general-purpose applications requiring through-hole mounting. The part operates across a temperature range of -25°C to 85°C with a rated lifetime of 2000 hours at 85°C.

Equivalent and substitute parts are necessary when the original SK2R2M350ST becomes unavailable, when design requirements demand enhanced performance characteristics such as extended lifetime or higher temperature operation, or when supply chain optimization requires sourcing from alternative manufacturers while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Capacitance	2.2	µF	Must match exactly
Voltage - Rated	350	V	Equal or higher acceptable
Tolerance	±20%	%	Must match or be tighter
Lead Spacing	0.138" (3.50mm)	inches (mm)	Must match for PCB compatibility
Size / Dimension	0.315" Dia (8.00mm)	inches (mm)	Must match for mechanical fit
Height - Seated (Max)	0.512" (13.00mm)	inches (mm)	Equal or lower acceptable
Mounting Type	Through Hole	-	Must match
Package / Case	Radial, Can	-	Must match
Polarization	Polar	-	Must match
Operating Temperature	-25°C ~ 85°C	°C	Equal or wider range acceptable
RoHS Status	ROHS3 Compliant	-	Must maintain compliance

Substitute Part Grouping Explanation

Substitution logic for the SK2R2M350ST is determined by strict adherence to the following mandatory parameters:

Electrical Parameters:

Capacitance must equal 2.2 µF
Tolerance must be ±20% or tighter
Voltage rating must be 350 V or higher (higher voltage ratings provide design margin)

Mechanical Parameters:

Lead spacing must be 0.138" (3.50mm)
Diameter must be 0.315" (8.00mm)
Height must not exceed 0.512" (13.00mm) for direct replacement; heights up to 0.531" (13.50mm) are acceptable in applications with adequate PCB clearance
Package type must be Radial, Can
Mounting type must be Through Hole

Environmental & Compliance Parameters:

Polarization must be Polar
Operating temperature range must encompass or exceed -25°C to 85°C
RoHS3 compliance must be maintained

Substitute parts are grouped into two categories: Direct Equivalents (matching all parameters including voltage rating) and Upgrade Options (higher voltage ratings, extended lifetime, or enhanced temperature performance while maintaining mechanical compatibility).

Parameter Comparison

Part Number	Manufacturer	Capacitance (µF)	Voltage (V)	Tolerance	Lead Spacing	Diameter	Height (Max)	Lifetime @ Temp	Operating Temp Range	Product Status
SK2R2M350ST	CDE	2.2	350	±20%	0.138" (3.50mm)	0.315" (8.00mm)	0.512" (13.00mm)	2000 Hrs @ 85°C	-25°C ~ 85°C	Active
UVR2V2R2MPD	Nichicon	2.2	350	±20%	0.138" (3.50mm)	0.315" (8.00mm)	0.512" (13.00mm)	2000 Hrs @ 85°C	-40°C ~ 85°C	Not For New Designs
400LLE2R2MEFC8X9	Rubycon	2.2	400	±20%	0.138" (3.50mm)	0.315" (8.00mm)	0.433" (11.00mm)	12000 Hrs @ 105°C	-40°C ~ 105°C	Not For New Designs
400BXC2.2MEFC8X11.5	Rubycon	2.2	400	±20%	0.138" (3.50mm)	0.315" (8.00mm)	0.531" (13.50mm)	8000 Hrs @ 105°C	-25°C ~ 105°C	Active
400LEX2.2MEFC8X11.5	Rubycon	2.2	400	±20%	0.138" (3.50mm)	0.315" (8.00mm)	0.531" (13.50mm)	5000 Hrs @ 125°C	-40°C ~ 125°C	Active
400LLE2.2MEFC8X11.5	Rubycon	2.2	400	±20%	0.138" (3.50mm)	0.315" (8.00mm)	0.512" (13.00mm)	15000 Hrs @ 105°C	-40°C ~ 105°C	Active
400LLE2R2MEFC8X11.5	Rubycon	2.2	400	±20%	0.138" (3.50mm)	0.315" (8.00mm)	0.512" (13.00mm)	15000 Hrs @ 105°C	-40°C ~ 105°C	Active
400RX302R2M8X11.5	Rubycon	2.2	400	±20%	0.138" (3.50mm)	0.315" (8.00mm)	0.531" (13.50mm)	2000 Hrs @ 130°C	-25°C ~ 130°C	Active
450PK2R2MEFC8X11.5	Rubycon	2.2	450	±20%	0.138" (3.50mm)	0.315" (8.00mm)	0.531" (13.50mm)	2000 Hrs @ 85°C	-25°C ~ 85°C	Active
B43821F9225M000	EPCOS - TDK Electronics	2.2	400	±20%	0.138" (3.50mm)	0.315" (8.00mm)	0.512" (13.00mm)	3000 Hrs @ 85°C	-25°C ~ 85°C	Obsolete
ECA-2GHG2R2	Panasonic Electronic Components	2.2	400	±20%	0.138" (3.50mm)	0.315" (8.00mm)	0.492" (12.50mm)	2000 Hrs @ 105°C	-25°C ~ 105°C	Active

Engineering Selection Recommendations

For Direct Replacement (Mechanical and Electrical Equivalence):

The UVR2V2R2MPD from Nichicon provides direct electrical equivalence at 350 V, 2.2 µF with identical mechanical dimensions. However, this part carries "Not For New Designs" status, limiting its suitability for new applications. The extended operating temperature range (-40°C to 85°C) offers improved low-temperature performance compared to the SK2R2M350ST.

For Active Product Status with Enhanced Performance:

The 400LLE2.2MEFC8X11.5 and 400LLE2R2MEFC8X11.5 from Rubycon are both Active products offering 400 V rating with 15000 hours lifetime at 105°C. These parts provide superior reliability margin through higher voltage rating and extended operational lifetime. The 400LLE2.2MEFC8X11.5 maintains the original height of 0.512" (13.00mm), ensuring direct PCB fit without modification.

For High-Temperature Applications:

The 400LEX2.2MEFC8X11.5 from Rubycon extends the operating temperature range to -40°C to 125°C with 5000 hours lifetime at 125°C, suitable for applications requiring elevated temperature performance. The 400RX302R2M8X11.5 from Rubycon, rated for automotive applications (AEC-Q200), operates to 130°C with 2000 hours lifetime at that temperature.

For Voltage Margin Enhancement:

The 450PK2R2MEFC8X11.5 from Rubycon provides the highest voltage rating at 450 V while maintaining the 2.2 µF capacitance and general-purpose application profile. This part is suitable when additional voltage safety margin is required.

For Panasonic Supply Chain:

The ECA-2GHG2R2 from Panasonic Electronic Components offers 400 V, 2.2 µF with 2000 hours lifetime at 105°C and Active product status. Height is 0.492" (12.50mm), providing additional PCB clearance compared to the original part.

All recommended substitute parts maintain ROHS3 compliance and identical lead spacing and diameter specifications. Selection should be based on product status requirements, lifetime specifications, and operating temperature demands of the target application.

Frequently Asked Questions (FAQ)

Q: Can I use a 400 V rated capacitor in place of the 350 V SK2R2M350ST?

A: Yes. Higher voltage ratings provide design margin and are electrically compatible. All 400 V substitute options listed maintain identical capacitance (2.2 µF), tolerance (±20%), and mechanical dimensions (lead spacing, diameter). The higher voltage rating does not degrade performance in 350 V applications.

Q: What is the difference between the 400LLE2.2MEFC8X11.5 and 400LLE2R2MEFC8X11.5?

A: Both parts are from Rubycon's LLE series with identical electrical specifications (2.2 µF, 400 V, ±20% tolerance) and mechanical dimensions (0.138" lead spacing, 0.315" diameter, 0.512" height). Both offer 15000 hours lifetime at 105°C and Active product status. The designation difference reflects internal manufacturing variations but does not affect substitution compatibility.

Q: Why is the UVR2V2R2MPD marked "Not For New Designs"?

A: Parts marked "Not For New Designs" indicate that the manufacturer has discontinued active development and recommends alternative products for new applications. While the UVR2V2R2MPD remains electrically and mechanically compatible with the SK2R2M350ST, its use should be limited to legacy system support or repair applications where existing inventory is available.

Q: Can I use the 400BXC2.2MEFC8X11.5 if my PCB has limited height clearance?

A: The 400BXC2.2MEFC8X11.5 has a maximum seated height of 0.531" (13.50mm), compared to the SK2R2M350ST at 0.512" (13.00mm). This represents a 0.019" (0.50mm) increase. If your PCB clearance is exactly 0.512" or less, this part will not fit. If clearance exceeds 0.531", installation is acceptable.

Q: What is the advantage of the 400LEX2.2MEFC8X11.5 over other 400 V options?

A: The 400LEX2.2MEFC8X11.5 extends the maximum operating temperature to 125°C with 5000 hours rated lifetime at that temperature. This makes it suitable for applications requiring sustained high-temperature operation. The operating temperature range of -40°C to 125°C is the widest among all listed substitutes.

Q: Is the 400RX302R2M8X11.5 suitable for consumer electronics applications?

A: The 400RX302R2M8X11.5 carries AEC-Q200 automotive qualification and is rated for automotive applications. While it meets all electrical and mechanical requirements for general-purpose use, its automotive-grade specification makes it suitable for both automotive and industrial applications requiring enhanced reliability standards.

Q: Do all substitute parts maintain the same ripple current rating as the SK2R2M350ST?

A: No. Ripple current specifications vary among substitute parts. The SK2R2M350ST specifies 28 mA at 120 Hz. Substitute parts range from 15 mA to 40 mA at 120 Hz depending on manufacturer and series. Ripple current capability should be verified against application requirements during component selection.

Q: Can I substitute the ECA-2GHG2R2 if my design requires exact height matching?

A: The ECA-2GHG2R2 has a maximum seated height of 0.492" (12.50mm), which is 0.020" (0.50mm) shorter than the SK2R2M350ST at 0.512" (13.00mm). If your PCB layout requires exact height matching, this part is not suitable. However, the reduced height provides additional clearance in space-constrained applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain ROHS3 compliance, matching the environmental compliance status of the SK2R2M350ST.

Q: What is the inventory status of substitute parts?

A: Inventory levels vary significantly. The 400LLE2R2MEFC8X11.5 has the highest availability at 99,967 pieces. The ECA-2GHG2R2 from Panasonic has 92,889 pieces available. Availability should be confirmed with component suppliers before design finalization.

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