SK3R3M250ST Equivalent & Substitute Parts

Part Overview

The SK3R3M250ST is a 3.3 µF, 250 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 reliable energy storage and filtering in circuits operating at 250 V nominal voltage. The SK series capacitor features a 2000-hour lifetime rating at 85°C and operates across the temperature range of -25°C to 85°C. Equivalent and substitute parts are identified for applications requiring alternative voltage ratings, extended lifetime specifications, or different manufacturer sourcing while maintaining the same capacitance value and tolerance.

Key Parameters

Parameter	Value	Unit
Capacitance	3.3	µF
Voltage - Rated	250	V
Tolerance	±20%	-
ESR @ 120 Hz	60.32	Ohm
Lifetime @ Temperature	2000 Hrs @ 85°C	-
Operating Temperature Range	-25°C ~ 85°C	-
Ripple Current @ 120 Hz	35	mA
Ripple Current @ 1 kHz	49	mA
Lead Spacing	0.138" (3.50 mm)	-
Diameter	0.315" (8.00 mm)	-
Height - Seated (Max)	0.512" (13.00 mm)	-
Mounting Type	Through Hole	-
Package / Case	Radial, Can	-
RoHS Status	ROHS3 Compliant	-
REACH Status	REACH Unaffected	-

Substitute Part Grouping Explanation

Substitute parts for the SK3R3M250ST are classified into two categories based on electrical and mechanical compatibility:

Direct Equivalent (Same Voltage Rating - 250 V): Parts maintaining the 250 V rated voltage specification with identical capacitance (3.3 µF) and tolerance (±20%). These substitutes provide direct functional replacement with potential variations in lifetime rating and operating temperature range. Direct equivalents include ECA-2EM3R3 and ECA-2EHG3R3.

Upgraded Voltage Rating (400 V and 450 V): Parts rated at higher voltages (400 V or 450 V) with the same 3.3 µF capacitance and ±20% tolerance. These upgrades are suitable for applications where the circuit voltage remains at or below 250 V but enhanced voltage margin is required for reliability or design margin. Upgraded parts include 400LEX3.3MEFC8X11.5, 400LLE3R3MEFC8X11.5, 450PK3.3MEFC8X11.5, 450PK3R3MEFC8X11.5, EKXE401ELL3R3MHB5D, ULD2G3R3MPD, and UVK2G3R3MPD.

Substitution Criteria: All substitute parts maintain the following parameters identical to the main part:

Capacitance: 3.3 µF
Tolerance: ±20%
Lead Spacing: 0.138" (3.50 mm)
Diameter: 0.315" (8.00 mm)
Mounting Type: Through Hole
Package / Case: Radial, Can
Polarization: Polar

Variations permitted in substitutes:

Voltage rating (equal to or greater than 250 V)
Lifetime rating at specified temperature
Operating temperature range
ESR characteristics
Ripple current specifications
Manufacturer and series designation

Parameter Comparison

Part Number	Manufacturer	Capacitance (µF)	Voltage (V)	Tolerance	Lifetime @ Temp	Operating Temp Range (°C)	Height Max (mm)	Product Status
SK3R3M250ST	Cornell Dubilier Electronics	3.3	250	±20%	2000 Hrs @ 85°C	-25 ~ 85	13.00	Active
ECA-2EM3R3	Panasonic Electronic Components	3.3	250	±20%	2000 Hrs @ 85°C	-25 ~ 85	12.50	Active
ECA-2EHG3R3	Panasonic Electronic Components	3.3	250	±20%	2000 Hrs @ 105°C	-25 ~ 105	12.50	Active
400LEX3.3MEFC8X11.5	Rubycon	3.3	400	±20%	5000 Hrs @ 125°C	-40 ~ 125	13.50	Active
400LLE3R3MEFC8X11.5	Rubycon	3.3	400	±20%	15000 Hrs @ 105°C	-40 ~ 105	13.00	Active
450PK3.3MEFC8X11.5	Rubycon	3.3	450	±20%	2000 Hrs @ 85°C	-25 ~ 85	13.50	Active
450PK3R3MEFC8X11.5	Rubycon	3.3	450	±20%	2000 Hrs @ 85°C	-25 ~ 85	13.50	Active
EKXE401ELL3R3MHB5D	Chemi-Con	3.3	400	±20%	10000 Hrs @ 105°C	-40 ~ 105	13.50	Active
ULD2G3R3MPD	Nichicon	3.3	400	±20%	15000 Hrs @ 105°C	-40 ~ 105	13.50	Not For New Designs
UVK2G3R3MPD	Nichicon	3.3	400	±20%	2000 Hrs @ 85°C	-40 ~ 85	12.50	Not For New Designs

Engineering Selection Recommendations

For Direct Replacement (250 V Applications): ECA-2EM3R3 (Panasonic) and ECA-2EHG3R3 (Panasonic) are Active status parts suitable for direct substitution. Both maintain 250 V voltage rating and ±20% tolerance. ECA-2EHG3R3 offers extended operating temperature range (-25°C to 105°C) and higher temperature lifetime rating (2000 Hrs @ 105°C) compared to the main part. Both are ROHS3 compliant and REACH unaffected.

For Enhanced Reliability (400 V Upgrade): 400LLE3R3MEFC8X11.5 (Rubycon) and EKXE401ELL3R3MHB5D (Chemi-Con) are Active status parts offering 400 V rating with extended lifetime specifications. 400LLE3R3MEFC8X11.5 provides 15000 Hrs @ 105°C lifetime. EKXE401ELL3R3MHB5D provides 10000 Hrs @ 105°C lifetime with extended operating temperature range (-40°C to 105°C). Both are ROHS3 compliant and REACH unaffected.

For Maximum Voltage Margin (450 V Upgrade): 450PK3R3MEFC8X11.5 (Rubycon) is an Active status part offering 450 V rating with 2000 Hrs @ 85°C lifetime, matching the main part's thermal specification. This part is ROHS3 compliant and REACH unaffected.

Parts Not Recommended for New Designs: ULD2G3R3MPD and UVK2G3R3MPD (Nichicon) carry "Not For New Designs" product status. ULD2G3R3MPD is REACH Affected. These parts are available for legacy system support only.

Compliance Verification: All recommended Active status substitutes maintain ROHS3 compliance and REACH unaffected status, consistent with the main part SK3R3M250ST.

Frequently Asked Questions (FAQ)

Q: Can ECA-2EM3R3 be used as a direct replacement for SK3R3M250ST? A: Yes. ECA-2EM3R3 maintains identical capacitance (3.3 µF), voltage rating (250 V), tolerance (±20%), and lifetime specification (2000 Hrs @ 85°C). Both are Active status products with ROHS3 compliance. Physical dimensions are compatible with identical lead spacing (3.50 mm) and similar height (12.50 mm vs. 13.00 mm).

Q: What is the advantage of using 400LLE3R3MEFC8X11.5 instead of SK3R3M250ST? A: 400LLE3R3MEFC8X11.5 provides higher voltage rating (400 V vs. 250 V) and significantly extended lifetime (15000 Hrs @ 105°C vs. 2000 Hrs @ 85°C). This upgrade is suitable for applications requiring enhanced reliability margin or operation in higher temperature environments. The part maintains identical capacitance and tolerance.

Q: Are there height restrictions when substituting with upgraded voltage parts? A: Physical dimensions vary among substitutes. The main part SK3R3M250ST has maximum seated height of 13.00 mm. Upgraded parts 400LEX3.3MEFC8X11.5, 450PK3.3MEFC8X11.5, 450PK3R3MEFC8X11.5, EKXE401ELL3R3MHB5D, and ULD2G3R3MPD have maximum height of 13.50 mm. Direct equivalent ECA-2EM3R3 and ECA-2EHG3R3 have maximum height of 12.50 mm. Verify PCB layout clearance before substitution.

Q: Can UVK2G3R3MPD be used in new designs? A: UVK2G3R3MPD carries "Not For New Designs" product status. This part is available for legacy system support and replacement applications only. For new designs, select from Active status alternatives such as ECA-2EM3R3, ECA-2EHG3R3, 400LLE3R3MEFC8X11.5, or EKXE401ELL3R3MHB5D.

Q: What is the difference between 450PK3.3MEFC8X11.5 and 450PK3R3MEFC8X11.5? A: Both parts are Rubycon 450 V rated capacitors with identical electrical specifications (3.3 µF, ±20% tolerance, 2000 Hrs @ 85°C lifetime, -25°C to 85°C operating range). Both maintain identical physical dimensions and lead spacing. Both are Active status products with ROHS3 compliance. Selection between these variants is based on manufacturer part number availability and inventory.

Q: Are all substitute parts ROHS3 compliant? A: All Active status substitute parts (ECA-2EM3R3, ECA-2EHG3R3, 400LEX3.3MEFC8X11.5, 400LLE3R3MEFC8X11.5, 450PK3.3MEFC8X11.5, 450PK3R3MEFC8X11.5, EKXE401ELL3R3MHB5D) are ROHS3 compliant. Parts with "Not For New Designs" status (ULD2G3R3MPD, UVK2G3R3MPD) are also ROHS3 compliant but ULD2G3R3MPD is REACH Affected.

Q: What ripple current specifications should be considered when selecting a substitute? A: Ripple current capacity varies among substitutes. The main part SK3R3M250ST supports 35 mA @ 120 Hz and 49 mA @ 1 kHz. Direct equivalent ECA-2EM3R3 supports higher ripple current (72 mA @ 120 Hz, 122.4 mA @ 10 kHz). Upgraded parts generally support comparable or higher ripple current specifications. Verify ripple current requirements of the application circuit before substitution.

Q: Can a 400 V rated capacitor be used in a 250 V circuit? A: Yes. A capacitor rated at higher voltage (400 V) can be used in circuits operating at lower voltage (250 V). The higher voltage rating provides additional safety margin and reliability. However, verify that physical dimensions and lead spacing are compatible with the PCB layout. All 400 V substitutes maintain identical lead spacing (3.50 mm) and compatible diameter (8.00 mm) to the main part.

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