SEK330M016ST Equivalent & Substitute Parts Reference

Part Overview

The SEK330M016ST is a 33 µF, 16 V aluminum electrolytic capacitor in radial, can package manufactured by Cornell Dubilier Electronics (CDE). 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 105°C and operates across the temperature range of -55°C to 105°C.

Equivalent and substitute parts are necessary when the original SEK330M016ST becomes unavailable due to manufacturer discontinuation, supply constraints, or design optimization requirements. Alternative components must maintain electrical compatibility while meeting the same functional requirements for capacitance, voltage rating, and thermal performance.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Capacitance	33	µF	Must match exactly
Voltage - Rated	16	V	Minimum requirement; higher voltage acceptable
Tolerance	±20%	%	Must match or be tighter
Lifetime @ Temperature	2000	Hrs @ 105°C	Must meet or exceed
Operating Temperature Range	-55°C to 105°C	°C	Must encompass or match
Polarization	Polar	—	Must match
Mounting Type	Through Hole	—	Must match
Package / Case	Radial, Can	—	Must match
Lead Spacing	0.079" (2.00 mm)	in (mm)	Must match for PCB compatibility
Size / Dimension	0.197" Dia (5.00 mm)	in (mm)	Must match for mechanical fit
RoHS Status	ROHS3 Compliant	—	Regulatory requirement

Substitute Part Grouping Explanation

Substitution logic for the SEK330M016ST is based on the following criteria:

Direct Electrical Equivalents maintain identical capacitance (33 µF), tolerance (±20%), voltage rating (16 V), and thermal lifetime (2000 Hrs @ 105°C). These parts are interchangeable without circuit redesign.

Voltage-Upgraded Substitutes increase the rated voltage above 16 V while maintaining all other electrical parameters. Higher voltage ratings provide additional safety margin and are electrically compatible in circuits designed for 16 V operation. Voltage-upgraded parts include 25 V and 35 V variants.

Mechanical Compatibility Requirements mandate that all substitutes maintain:

Lead spacing of 0.079" (2.00 mm)
Diameter of 0.197" (5.00 mm)
Radial, can package configuration
Through-hole mounting type

Regulatory and Compliance Alignment requires all substitutes to maintain ROHS3 compliance and REACH unaffected status, matching the original part's environmental certifications.

Parameter Comparison

Parameter	SEK330M016ST (CDE)	UPW1C330MDD (Nichicon)	UPJ1E330MDD (Nichicon)	UPW1E330MDD (Nichicon)	UPW1V330MDD (Nichicon)
Manufacturer	Cornell Dubilier Electronics	Nichicon	Nichicon	Nichicon	Nichicon
Capacitance	33 µF	33 µF	33 µF	33 µF	33 µF
Tolerance	±20%	±20%	±20%	±20%	±20%
Voltage - Rated	16 V	16 V	25 V	25 V	35 V
Lifetime @ Temperature	2000 Hrs @ 105°C	2000 Hrs @ 105°C	2000 Hrs @ 105°C	2000 Hrs @ 105°C	2000 Hrs @ 105°C
Operating Temperature	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C
Polarization	Polar	Polar	Polar	Polar	Polar
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Can	Radial, Can	Radial, Can	Radial, Can	Radial, Can
Lead Spacing	0.079" (2.00 mm)	0.079" (2.00 mm)	0.079" (2.00 mm)	0.079" (2.00 mm)	0.079" (2.00 mm)
Size / Dimension	0.197" Dia (5.00 mm)	0.197" Dia (5.00 mm)	0.197" Dia (5.00 mm)	0.197" Dia (5.00 mm)	0.197" Dia (5.00 mm)
Height - Seated (Max)	0.512" (13.00 mm)	0.433" (11.00 mm)	0.472" (12.00 mm)	0.433" (11.00 mm)	0.433" (11.00 mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Obsolete	Obsolete	Obsolete	Obsolete

Engineering Selection Recommendations

Direct Equivalent Selection: UPW1C330MDD (Nichicon) is the primary direct equivalent, matching the SEK330M016ST in capacitance, voltage rating, tolerance, and thermal lifetime. Both components maintain identical electrical specifications and mechanical dimensions. Selection of UPW1C330MDD is appropriate when direct replacement is required without circuit modification.

Voltage-Upgraded Selection: UPW1E330MDD (25 V) and UPW1V330MDD (35 V) are voltage-upgraded alternatives that maintain all electrical parameters except rated voltage. These parts are suitable for applications where increased voltage margin is beneficial or where circuit design permits higher voltage ratings. Voltage-upgraded substitutes do not require circuit redesign when the original circuit operates below the substitute's rated voltage.

Compliance Alignment: All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility with the original SEK330M016ST. No compliance barriers exist for substitution.

Product Status Consideration: The SEK330M016ST maintains Active status, while all Nichicon substitutes are classified as Obsolete. Active status indicates continued manufacturer support and availability. When long-term supply assurance is required, the SEK330M016ST should be prioritized. Obsolete status for substitute parts indicates discontinued production; however, inventory availability may vary by distributor.

Mechanical Fit Verification: All substitute parts maintain lead spacing of 0.079" (2.00 mm) and diameter of 0.197" (5.00 mm), ensuring PCB footprint compatibility. Height variations exist: SEK330M016ST measures 0.512" (13.00 mm), while Nichicon substitutes measure between 0.433" (11.00 mm) and 0.472" (12.00 mm). Verify clearance in applications with height constraints.

Frequently Asked Questions (FAQ)

Q: Can UPW1C330MDD directly replace SEK330M016ST without any circuit modifications?

A: Yes. UPW1C330MDD is a direct electrical equivalent with identical capacitance (33 µF), voltage rating (16 V), tolerance (±20%), and thermal lifetime (2000 Hrs @ 105°C). Mechanical compatibility is confirmed through matching lead spacing (0.079" / 2.00 mm) and diameter (0.197" / 5.00 mm). No circuit redesign is required.

Q: What is the difference between direct equivalents and voltage-upgraded substitutes?

A: Direct equivalents maintain the original 16 V rating (UPW1C330MDD). Voltage-upgraded substitutes increase the rated voltage to 25 V (UPW1E330MDD) or 35 V (UPW1V330MDD) while preserving all other electrical parameters. Higher voltage ratings provide additional safety margin and are compatible in circuits designed for lower voltages.

Q: Are there any height clearance issues when substituting with Nichicon parts?

A: The SEK330M016ST has a maximum seated height of 0.512" (13.00 mm). Nichicon substitutes measure 0.433" (11.00 mm) to 0.472" (12.00 mm). All substitutes are shorter than the original part. Verify available clearance in applications with tight vertical space constraints; shorter substitutes will not cause interference in designs accommodating the original height.

Q: Do all substitute parts meet the same regulatory requirements as SEK330M016ST?

A: Yes. All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, matching the regulatory certifications of the original SEK330M016ST. No compliance barriers exist for substitution.

Q: What is the significance of "Obsolete" product status for the Nichicon substitutes?

A: Obsolete status indicates that Nichicon has discontinued production of these parts. However, inventory may remain available through authorized distributors. When long-term supply assurance is critical, prioritize the Active-status SEK330M016ST. For immediate replacement needs, verify current distributor inventory before committing to Nichicon substitutes.

Q: Can I use a 25 V or 35 V substitute in a circuit designed for 16 V operation?

A: Yes. Voltage-upgraded substitutes (UPW1E330MDD at 25 V and UPW1V330MDD at 35 V) are electrically compatible in circuits designed for 16 V operation. The higher voltage rating provides additional safety margin without affecting circuit function. No circuit modifications are required.

Q: Are the ripple current ratings identical across all substitute options?

A: No. Ripple current specifications vary between manufacturers and series. The SEK330M016ST specifies 70 mA @ 120 Hz and 84 mA @ 10 kHz. Nichicon UPW series parts specify 54 mA @ 120 Hz and 180 mA @ 100 kHz. Verify ripple current requirements for your specific application before substitution.

Q: What is the lead spacing requirement, and do all substitutes meet it?

A: Lead spacing must be 0.079" (2.00 mm) for PCB footprint compatibility. All listed substitutes maintain this spacing. Verify your PCB design accommodates this lead spacing before component selection.

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