SK331M6R3ST Equivalent & Substitute Parts Reference

Part Overview

The SK331M6R3ST is a 330 µF, 6.3 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in radial, can package configuration. This component is classified as Active status and is designed for general-purpose applications requiring through-hole mounting. The part features a 2000-hour lifetime rating at 85°C with an 880 mOhm equivalent series resistance at 120 Hz.

Equivalent and substitute parts are necessary when the original SK331M6R3ST becomes unavailable due to inventory constraints, supply chain disruptions, or end-of-life status of alternative manufacturers' offerings. Substitute parts must maintain identical or superior electrical and mechanical parameters to ensure functional compatibility within the circuit design.

Key Parameters

Parameter	Value	Unit	Substitution Criticality
Capacitance	330	µF	Critical - Must Match
Voltage Rating	6.3	V	Critical - Must Match or Exceed
Tolerance	±20%	%	Critical - Must Match
Polarization	Polar	-	Critical - Must Match
Mounting Type	Through Hole	-	Critical - Must Match
Package Type	Radial, Can	-	Critical - Must Match
Lead Spacing	0.098" (2.50 mm)	-	Critical - Must Match
Diameter	0.248" (6.30 mm)	-	Critical - Must Match
Height (Seated Max)	0.512" (13.00 mm)	-	Important - Physical Fit
Operating Temperature Range	-40°C to 85°C	-	Important - Application Dependent
Lifetime @ Temperature	2000 Hrs @ 85°C	-	Important - Reliability
RoHS Status	ROHS3 Compliant	-	Important - Regulatory

Substitute Part Grouping Explanation

Substitute parts for the SK331M6R3ST are categorized into two groups based on electrical and mechanical compatibility:

Direct Equivalents (Same Voltage Rating - 6.3 V): Direct equivalent parts maintain the 6.3 V voltage rating, 330 µF capacitance, ±20% tolerance, and identical mechanical dimensions (0.248" diameter, 2.50 mm lead spacing). These parts are interchangeable in applications where the original 6.3 V rating is specified. Direct equivalents include ECA-0JM331 (Panasonic), EEU-FM0J331 (Panasonic), UVR0J331MED (Nichicon), and 6.3YXJ330M6.3X11 (Rubycon).

Upgrade Parts (Higher Voltage Ratings - 10 V or 16 V): Upgrade parts maintain the 330 µF capacitance, ±20% tolerance, and identical mechanical dimensions but feature higher voltage ratings (10 V or 16 V). These parts are electrically compatible in circuits designed for 6.3 V operation, as higher voltage-rated capacitors can safely operate at lower voltages. Upgrade parts include 10ZLH330MEFC6.3X11, 10ZLJ330M6.3X11, 16PK330MEFC6.3X11, 16YXJ330M6.3X11, 16ZLQ330MEFC6.3X11, and 6.3ZL330MEFC6.3X11.

Substitution Criteria: The following parameters determine substitution eligibility:

Capacitance: 330 µF (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: 0.098" / 2.50 mm (exact match required)
Diameter: 0.248" / 6.30 mm (exact match required)
Voltage Rating: 6.3 V minimum (equal or higher acceptable)
Height: Physical fit within circuit board constraints

Parameter Comparison

Manufacturer Part Number	Manufacturer	Capacitance (µF)	Voltage (V)	Tolerance (%)	Height Max (mm)	Lifetime @ Temp	Operating Temp (°C)	Product Status	Inventory (Pcs)
SK331M6R3ST	Cornell Dubilier	330	6.3	±20	13.00	2000 Hrs @ 85°C	-40 to 85	Active	714
ECA-0JM331	Panasonic	330	6.3	±20	12.20	2000 Hrs @ 85°C	-40 to 85	Active	4515
EEU-FM0J331	Panasonic	330	6.3	±20	12.70	2000 Hrs @ 105°C	-40 to 105	Active	1394
UVR0J331MED	Nichicon	330	6.3	±20	12.50	2000 Hrs @ 85°C	-40 to 85	Obsolete	2122
10ZLH330MEFC6.3X11	Rubycon	330	10	±20	12.50	6000 Hrs @ 105°C	-40 to 105	Active	9030
10ZLJ330M6.3X11	Rubycon	330	10	±20	12.50	7000 Hrs @ 105°C	-40 to 105	Active	8962
16PK330MEFC6.3X11	Rubycon	330	16	±20	12.50	2000 Hrs @ 85°C	-40 to 85	Active	8461
16YXJ330M6.3X11	Rubycon	330	16	±20	12.50	7000 Hrs @ 105°C	-40 to 105	Active	13905
16ZLQ330MEFC6.3X11	Rubycon	330	16	±20	12.50	3000 Hrs @ 105°C	-40 to 105	Active	4233
6.3YXJ330M6.3X11	Rubycon	330	6.3	±20	12.50	6000 Hrs @ 105°C	-40 to 105	Active	2723
6.3ZL330MEFC6.3X11	Rubycon	330	6.3	±20	12.50	2000 Hrs @ 105°C	-40 to 105	Last Time Buy	2555

Engineering Selection Recommendations

For Direct Voltage Equivalent Selection (6.3 V):

ECA-0JM331 (Panasonic M-A Series) is the primary direct equivalent. This part maintains identical electrical specifications (330 µF, 6.3 V, ±20% tolerance) with Active product status and the highest inventory availability (4515 units). The seated height of 12.20 mm is 0.80 mm lower than the original SK331M6R3ST, providing improved physical fit in space-constrained applications. ROHS3 compliance and REACH Unaffected status match the original part requirements.

EEU-FM0J331 (Panasonic FM-A Series) offers enhanced thermal performance with 2000-hour lifetime at 105°C versus 85°C for the original part. This part extends the operating temperature range to 105°C and is suitable for applications requiring improved thermal stability. Active product status and ROHS3 compliance are confirmed.

6.3YXJ330M6.3X11 (Rubycon YXJ Series) provides the longest thermal lifetime among 6.3 V equivalents at 6000 hours at 105°C. This part is recommended for applications requiring extended operational life in elevated temperature environments. Active product status and ROHS3 compliance are confirmed.

6.3ZL330MEFC6.3X11 (Rubycon ZL Series) maintains the original 2000-hour lifetime specification but extends the temperature rating to 105°C. This part is designated Last Time Buy status, indicating limited future availability. Selection of this part should be evaluated against long-term supply requirements.

UVR0J331MED (Nichicon UVR Series) is not recommended for new designs due to Obsolete product status, despite adequate inventory availability (2122 units). This designation indicates the manufacturer has discontinued production and support.

For Upgrade Voltage Selection (10 V or 16 V):

10ZLJ330M6.3X11 (Rubycon ZLJ Series) is the recommended 10 V upgrade option, offering the longest thermal lifetime at 7000 hours at 105°C with the highest ripple current capability at 100 kHz (700 mA). Active product status and high inventory (8962 units) ensure supply continuity.

16YXJ330M6.3X11 (Rubycon YXJ Series) is the recommended 16 V upgrade option, providing 7000-hour lifetime at 105°C with the highest inventory availability among 16 V options (13905 units). Active product status and ROHS3 compliance are confirmed.

All recommended parts maintain identical mechanical dimensions (0.248" diameter, 2.50 mm lead spacing) and are through-hole radial can packages suitable for direct PCB mounting without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can I use a 10 V or 16 V rated capacitor in place of the 6.3 V SK331M6R3ST?

A: Yes. Higher voltage-rated capacitors operate safely at lower voltages. A 10 V or 16 V capacitor will function correctly in a 6.3 V circuit. The voltage rating indicates the maximum voltage the capacitor can withstand; operating at lower voltages does not degrade performance or reliability.

Q: What is the difference between direct equivalents and upgrade parts?

A: Direct equivalents maintain the original 6.3 V voltage rating and are electrically and mechanically identical to the SK331M6R3ST. Upgrade parts feature higher voltage ratings (10 V or 16 V) but maintain the same 330 µF capacitance and physical dimensions. Both categories are functionally compatible in the original circuit.

Q: Does the height difference between parts affect PCB compatibility?

A: The SK331M6R3ST has a maximum seated height of 13.00 mm. Most substitute parts have heights between 12.20 mm and 12.70 mm, which are shorter. Shorter heights improve physical fit and reduce the risk of component interference. Verify that the circuit board layout accommodates the specific height of the selected substitute part. Taller substitute parts (if any) may require layout verification to ensure clearance.

Q: Why is UVR0J331MED listed as Obsolete?

A: Obsolete status indicates that Nichicon has discontinued production of this part. While inventory may still be available (2122 units), the manufacturer no longer supports or manufactures this component. For new designs and long-term supply assurance, selection of Active status parts is recommended.

Q: What does Last Time Buy status mean for 6.3ZL330MEFC6.3X11?

A: Last Time Buy status indicates that Rubycon has announced the end of production for this part. Existing inventory (2555 units) represents the final available supply. After this inventory is depleted, the part will no longer be available. This part should be selected only if immediate requirements are met and long-term supply is not critical.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain ROHS3 compliance status, matching the original SK331M6R3ST. All parts are also REACH Unaffected, confirming regulatory compliance for industrial and commercial applications.

Q: Which substitute part offers the best thermal performance?

A: 10ZLJ330M6.3X11 (10 V, Rubycon ZLJ Series) and 16YXJ330M6.3X11 (16 V, Rubycon YXJ Series) both offer 7000-hour lifetime ratings at 105°C, representing the longest thermal endurance among available substitutes. Selection between these two depends on whether the 10 V or 16 V voltage rating is appropriate for the application.

Q: Can I mix different substitute parts in the same circuit board?

A: Yes. All substitute parts maintain identical capacitance (330 µF), tolerance (±20%), polarization (polar), and mechanical dimensions (0.248" diameter, 2.50 mm lead spacing). Multiple substitute parts can be used interchangeably within the same design without functional impact, provided each part meets the specific voltage and thermal requirements of its circuit location.

Q: What is the lead spacing specification, and why is it important?

A: Lead spacing is 0.098" (2.50 mm) for all parts in this reference. This specification defines the distance between the two leads on the radial can package and determines PCB hole pattern compatibility. All substitute parts maintain this identical spacing, ensuring direct PCB mounting without modification.

Q: How do I select between Panasonic and Rubycon substitute parts?

A: Both manufacturers provide equivalent electrical performance. Selection criteria include: (1) inventory availability and lead time requirements, (2) thermal performance needs (Panasonic EEU-FM0J331 and Rubycon YXJ/ZLJ series offer extended temperature ratings), (3) voltage rating requirements (direct 6.3 V equivalents or upgraded 10 V/16 V ratings), and (4) product status (Active status preferred over Obsolete or Last Time Buy).

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message