Equivalent & Substitute Parts Reference: SS3R3M063ST

Part Overview

The SS3R3M063ST is a 3.3 µF, 63 V aluminum electrolytic capacitor in radial, can package manufactured by Cornell Dubilier Electronics (CDE). This component is classified as obsolete, indicating discontinued production. The part operates across a temperature range of -40°C to 85°C with a rated lifetime of 1000 hours at 85°C. Due to its obsolete status, equivalent and substitute parts are necessary for ongoing design support, maintenance, and production continuity in applications requiring general-purpose energy storage and filtering.

Key Parameters

Parameter	Value	Unit
Capacitance	3.3	µF
Voltage - Rated	63	V
Tolerance	±20%	-
ESR @ 120 Hz	32.17	Ohm
Lifetime @ 85°C	1000	Hrs
Operating Temperature Range	-40 to 85	°C
Ripple Current @ 120 Hz	26	mA
Ripple Current @ 1 kHz	29.9	mA
Lead Spacing	0.059 (1.50)	" (mm)
Diameter	0.157 (4.00)	" (mm)
Height - Seated (Max)	0.276 (7.00)	" (mm)
Mounting Type	Through Hole	-
Package / Case	Radial, Can	-
RoHS Status	ROHS3 Compliant	-
Product Status	Obsolete	-

Substitute Part Grouping Explanation

Substitution eligibility for the SS3R3M063ST is determined by the following critical parameters:

Primary Matching Criteria:

Capacitance: 3.3 µF (exact match required)
Voltage Rating: 63 V minimum (equal or higher acceptable)
Tolerance: ±20% (standard for aluminum electrolytic capacitors)
Polarization: Polar (radial configuration)
Mounting Type: Through Hole

Secondary Compatibility Factors:

Operating Temperature Range: Must encompass -40°C to 85°C minimum
ESR and Ripple Current: Must not exceed application requirements
Lead Spacing and Physical Dimensions: Must fit PCB layout constraints
RoHS Compliance: ROHS3 Compliant status required

The substitute parts identified below meet the primary matching criteria and maintain functional equivalence within the specified electrical and mechanical parameters.

Parameter Comparison

Parameter	SS3R3M063ST (Main)	SK3R3M063ST	UPW2A3R3MDD
Manufacturer	Cornell Dubilier Electronics	Cornell Dubilier Electronics	Nichicon
Capacitance	3.3 µF	3.3 µF	3.3 µF
Voltage - Rated	63 V	63 V	100 V
Tolerance	±20%	±20%	±20%
ESR @ 120 Hz	32.17 Ohm	36.19 Ohm	Not Specified
Lifetime @ Temp.	1000 Hrs @ 85°C	2000 Hrs @ 85°C	2000 Hrs @ 105°C
Operating Temperature	-40 to 85°C	-40 to 85°C	-55 to 105°C
Ripple Current @ 120 Hz	26 mA	40 mA	17.4 mA
Ripple Current @ 1 kHz	29.9 mA	52 mA	58 mA @ 100 kHz
Lead Spacing	0.059" (1.50 mm)	0.079" (2.00 mm)	0.079" (2.00 mm)
Diameter	0.157" (4.00 mm)	0.197" (5.00 mm)	0.197" (5.00 mm)
Height - Seated (Max)	0.276" (7.00 mm)	0.512" (13.00 mm)	0.433" (11.00 mm)
Mounting Type	Through Hole	Radial, Can	Through Hole
Package / Case	Radial, Can	Radial, Can	Radial, Can
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Obsolete

Engineering Selection Recommendations

SK3R3M063ST (Cornell Dubilier Electronics)

The SK3R3M063ST is an active-status equivalent from the same manufacturer. It maintains identical capacitance (3.3 µF) and voltage rating (63 V) specifications. The SK series offers extended lifetime (2000 hours at 85°C versus 1000 hours), providing improved reliability for long-term applications. Physical dimensions are larger (0.197" diameter, 0.512" height versus 0.157" diameter, 0.276" height), requiring PCB layout verification. Lead spacing increases from 1.50 mm to 2.00 mm. ROHS3 compliance is maintained. This substitute is suitable for applications where PCB space permits the larger footprint and where extended operational lifetime is beneficial.

UPW2A3R3MDD (Nichicon)

The UPW2A3R3MDD is an obsolete Nichicon part with identical capacitance (3.3 µF) but elevated voltage rating (100 V). This higher voltage rating provides design margin in applications subject to voltage transients or overvoltage conditions. Operating temperature range extends to -55°C to 105°C, exceeding the original specification. Physical dimensions match the SK3R3M063ST (0.197" diameter, 0.433" height). Lead spacing is 2.00 mm. ROHS3 compliance is confirmed. This substitute is applicable where higher voltage tolerance and extended temperature operation are required, contingent on PCB layout accommodation of larger dimensions.

Both substitutes maintain ROHS3 compliance and through-hole radial can package configuration. Selection between SK3R3M063ST and UPW2A3R3MDD depends on voltage margin requirements, temperature operating envelope, and available PCB space.

Frequently Asked Questions (FAQ)

Q: Can the SK3R3M063ST directly replace the SS3R3M063ST without PCB modification?

A: The SK3R3M063ST has different physical dimensions and lead spacing. The SS3R3M063ST measures 0.157" diameter with 1.50 mm lead spacing, while the SK3R3M063ST measures 0.197" diameter with 2.00 mm lead spacing. PCB layout verification is required to confirm hole pattern compatibility.

Q: What is the significance of the voltage rating difference between SS3R3M063ST (63 V) and UPW2A3R3MDD (100 V)?

A: The UPW2A3R3MDD's higher voltage rating (100 V) provides additional safety margin above the 63 V specification. This is beneficial in circuits experiencing voltage spikes or transient overvoltage conditions. However, the higher voltage rating does not alter the capacitance value or fundamental electrical behavior at rated 63 V operation.

Q: Why is the SS3R3M063ST marked as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The SK3R3M063ST from the same manufacturer (Cornell Dubilier Electronics) is an active-status alternative, making it the preferred choice for new designs and ongoing production requirements.

Q: Are there thermal performance differences between the substitutes?

A: The SK3R3M063ST offers 2000 hours lifetime at 85°C compared to the SS3R3M063ST's 1000 hours. The UPW2A3R3MDD extends to 2000 hours at 105°C, indicating superior thermal stability. Both substitutes provide improved thermal performance relative to the original part.

Q: What is the impact of ESR (Equivalent Series Resistance) differences?

A: The SS3R3M063ST has 32.17 Ohm ESR at 120 Hz, while the SK3R3M063ST has 36.19 Ohm ESR. The UPW2A3R3MDD ESR is not specified. Higher ESR increases heat dissipation and may affect high-frequency filtering performance. Application-specific ripple current and frequency requirements determine acceptable ESR limits.

Q: Can the UPW2A3R3MDD be used in all applications where the SS3R3M063ST is specified?

A: The UPW2A3R3MDD is functionally compatible for capacitance and voltage requirements. However, it is also marked obsolete. Physical dimensions differ significantly (0.433" height versus 0.276" height), requiring PCB layout confirmation. The extended temperature range (-55°C to 105°C) is a superset of the original specification, making it suitable for wider environmental conditions.

Q: What compliance certifications are maintained across all parts?

A: All three parts (SS3R3M063ST, SK3R3M063ST, and UPW2A3R3MDD) are ROHS3 compliant. The SK3R3M063ST and UPW2A3R3MDD carry REACH Unaffected status where specified. Compliance documentation should be verified with the respective manufacturer for specific applications.

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