SEK331M6R3ST Equivalent & Substitute Parts Reference

Part Overview

The SEK331M6R3ST is a 330 µF, 6.3 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in radial, through-hole configuration. This component is classified as Active product status and is designed for general-purpose applications requiring stable capacitance and extended operational life at elevated temperatures.

Substitute parts become necessary when the primary manufacturer part reaches end-of-life status, inventory constraints occur, or design flexibility is required across multiple qualified suppliers. The UPW0J331MED from Nichicon represents a functionally equivalent alternative, though it carries Obsolete product status and requires careful evaluation before implementation in new designs.

Key Parameters

Parameter	Value	Unit	Criticality for Substitution
Capacitance	330	µF	Critical Match Required
Voltage Rating	6.3	V	Critical Match Required
Tolerance	±20%	%	Critical Match Required
Operating Temperature Range	-55 to 105	°C	Critical Match Required
Lifetime at Temperature	2000	Hrs @ 105°C	Critical Match Required
Polarization	Polar	—	Critical Match Required
Mounting Type	Through Hole	—	Critical Match Required
Package Type	Radial, Can	—	Critical Match Required
Lead Spacing	0.098" (2.50 mm)	—	Critical Match Required
Case Diameter	0.248" (6.30 mm)	—	Critical Match Required
RoHS Compliance	ROHS3 Compliant	—	Regulatory Requirement

Substitute Part Grouping Explanation

Substitution eligibility for the SEK331M6R3ST is determined by strict equivalence across the following parameters:

Electrical Parameters (Must Match Exactly):

Capacitance: 330 µF
Voltage Rating: 6.3 V
Tolerance: ±20%
Operating Temperature Range: -55°C to 105°C
Lifetime: 2000 Hrs @ 105°C
Polarization: Polar

Mechanical Parameters (Must Match Exactly):

Mounting Type: Through Hole
Package Type: Radial, Can
Lead Spacing: 0.098" (2.50 mm)
Case Diameter: 0.248" (6.30 mm)

Regulatory Parameters (Must Match or Exceed):

RoHS3 Compliance

The UPW0J331MED from Nichicon satisfies all critical electrical and mechanical parameters. However, its Obsolete product status requires consideration in long-term supply chain planning.

Parameter Comparison

Parameter	SEK331M6R3ST (CDE)	UPW0J331MED (Nichicon)	Match Status
Capacitance	330 µF	330 µF	Exact Match
Voltage Rating	6.3 V	6.3 V	Exact Match
Tolerance	±20%	±20%	Exact Match
Operating Temperature	-55°C to 105°C	-55°C to 105°C	Exact Match
Lifetime @ 105°C	2000 Hrs	2000 Hrs	Exact Match
Polarization	Polar	Polar	Exact Match
Mounting Type	Through Hole	Through Hole	Exact Match
Package Type	Radial, Can	Radial, Can	Exact Match
Lead Spacing	0.098" (2.50 mm)	0.098" (2.50 mm)	Exact Match
Case Diameter	0.248" (6.30 mm)	0.248" (6.30 mm)	Exact Match
Height (Seated Max)	0.453" (11.50 mm)	0.433" (11.00 mm)	Compatible (UPW0J331MED is 0.02" shorter)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Exact Match
REACH Status	REACH Unaffected	REACH Unaffected	Exact Match
Product Status	Active	Obsolete	Different

Engineering Selection Recommendations

For Active Design Implementation: The SEK331M6R3ST is the primary selection for new designs. It carries Active product status, ensuring long-term availability and manufacturer support. Current inventory of 859 pieces supports immediate procurement.

For Existing Design Substitution: The UPW0J331MED is electrically and mechanically equivalent and qualifies as a direct substitute. All critical parameters match exactly. The component is ROHS3 compliant and REACH unaffected, meeting regulatory requirements.

Product Status Consideration: The UPW0J331MED carries Obsolete status. While it is functionally suitable for substitution, its obsolete classification indicates limited future availability. Use this part only when SEK331M6R3ST supply is constrained or when existing inventory of UPW0J331MED is being consumed (4863 pieces currently in stock).

Height Dimension Note: The UPW0J331MED seated height is 0.433" (11.00 mm) compared to the SEK331M6R3ST at 0.453" (11.50 mm). This 0.02" difference is within typical PCB layout tolerances for through-hole radial capacitors and does not affect electrical performance or mechanical fit in standard applications.

Frequently Asked Questions (FAQ)

Q: Can the UPW0J331MED be used as a direct replacement for the SEK331M6R3ST on existing PCBs?

A: Yes. The UPW0J331MED is electrically and mechanically equivalent. Lead spacing (0.098"), case diameter (0.248"), and all electrical parameters match exactly. The 0.02" height difference does not affect PCB fit or performance.

Q: Why does the UPW0J331MED show Obsolete status while the SEK331M6R3ST is Active?

A: Product status reflects manufacturer lifecycle classification. The SEK331M6R3ST remains in active production by Cornell Dubilier Electronics. The UPW0J331MED has been discontinued by Nichicon but remains functionally equivalent for substitution purposes. Existing inventory (4863 pieces) is available for use.

Q: Are there electrical performance differences between these parts?

A: Both parts meet the same electrical specifications: 330 µF capacitance, 6.3 V rating, ±20% tolerance, 2000 Hrs @ 105°C lifetime, and -55°C to 105°C operating range. ESR and ripple current specifications differ slightly but both parts are rated for general-purpose applications.

Q: What compliance certifications apply to both parts?

A: Both the SEK331M6R3ST and UPW0J331MED are ROHS3 compliant and REACH unaffected. Both carry ECCN EAR99 classification and HTSUS code 8532.22.0020.

Q: Can these parts be used interchangeably in high-reliability applications?

A: Electrical and mechanical parameters are equivalent. However, the SEK331M6R3ST (Active status) is the preferred choice for new high-reliability designs. The UPW0J331MED (Obsolete status) is suitable for sustaining production or design updates where existing inventory is being utilized.

Q: What is the moisture sensitivity level for these capacitors?

A: The SEK331M6R3ST has MSL 1 (Unlimited). The UPW0J331MED is listed as Not Applicable for MSL, indicating standard handling procedures apply to both parts.

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