SEK330M025ST Equivalent & Substitute Parts Reference

Part Overview

The SEK330M025ST is a 33 µF, 25 V aluminum electrolytic capacitor in radial, can package manufactured by Cornell Dubilier Electronics (CDE). 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.

The SEK330M025ST has been superseded by equivalent alternatives from Nichicon. This reference provides engineering data for direct substitution and upgraded voltage-rated options that maintain functional compatibility while offering improved electrical characteristics or higher voltage ratings for enhanced circuit margin.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Capacitance	33	µF	Critical - must match exactly
Voltage - Rated	25	V	Critical - minimum requirement; higher ratings acceptable
Tolerance	±20%	%	Critical - must match or be tighter
Lifetime @ Temperature	2000	Hrs @ 105°C	Critical - determines reliability at operating temperature
Operating Temperature Range	-55°C ~ 105°C	°C	Critical - must encompass application requirements
Lead Spacing	0.079"	(2.00 mm)	Critical - PCB layout compatibility
Size / Dimension	0.197" Dia	(5.00 mm)	Critical - physical fit on PCB
Height - Seated (Max)	0.512"	(13.00 mm)	Critical - clearance and assembly compatibility
Mounting Type	Through Hole	-	Critical - assembly process compatibility
Package / Case	Radial, Can	-	Critical - form factor and footprint
Polarization	Polar	-	Critical - circuit polarity requirements
RoHS Status	ROHS3 Compliant	-	Regulatory - environmental compliance

Substitute Part Grouping Explanation

Substitution eligibility for the SEK330M025ST is determined by strict adherence to the following critical parameters:

Mandatory Matching Parameters:

Capacitance: 33 µF (exact match required)
Tolerance: ±20% (exact match required)
Voltage Rating: 25 V minimum (higher ratings are acceptable as upgrades)
Lifetime: 2000 Hrs @ 105°C (exact match required)
Operating Temperature: -55°C ~ 105°C (exact match required)
Lead Spacing: 0.079" (2.00 mm) (exact match required)
Size / Dimension: 0.197" Dia (5.00 mm) (exact match required)
Mounting Type: Through Hole (exact match required)
Package / Case: Radial, Can (exact match required)
Polarization: Polar (exact match required)

Substitution Categories:

Direct Equivalents maintain all electrical and mechanical parameters identical to the SEK330M025ST:

UPJ1E330MDD (Nichicon UPJ series)
UPW1E330MDD (Nichicon UPW series)

Upgraded Substitute provides higher voltage rating (35 V vs. 25 V) while maintaining all other critical parameters:

UPW1V330MDD (Nichicon UPW series, 35 V rated)

All substitute parts are ROHS3 compliant and rated for identical operating temperature ranges and lifetimes.

Parameter Comparison

Parameter	SEK330M025ST (CDE)	UPJ1E330MDD (Nichicon)	UPW1E330MDD (Nichicon)	UPW1V330MDD (Nichicon)
Capacitance	33 µF	33 µF	33 µF	33 µF
Voltage - Rated	25 V	25 V	25 V	35 V
Tolerance	±20%	±20%	±20%	±20%
Lifetime @ Temp.	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
Ripple Current @ 120 Hz	75 mA	88 mA	54 mA	54 mA
Ripple Current @ High Frequency	90 mA @ 10 kHz	155 mA @ 10 kHz	180 mA @ 100 kHz	180 mA @ 100 kHz
Lead Spacing	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)
Height - Seated (Max)	0.512" (13.00 mm)	0.472" (12.00 mm)	0.433" (11.00 mm)	0.433" (11.00 mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Can	Radial, Can	Radial, Can	Radial, Can
Polarization	Polar	Polar	Polar	Polar
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Obsolete	Obsolete	Obsolete

Engineering Selection Recommendations

For Direct Replacement (Same Voltage Rating):

UPJ1E330MDD and UPW1E330MDD are functionally equivalent to SEK330M025ST. Both maintain identical capacitance, voltage rating, tolerance, lifetime, and operating temperature specifications. Selection between these two direct equivalents depends on ripple current requirements and physical height constraints:

UPJ1E330MDD provides higher ripple current capability at low frequency (88 mA @ 120 Hz vs. 75 mA) and high frequency (155 mA @ 10 kHz vs. 90 mA), with seated height of 0.472" (12.00 mm).
UPW1E330MDD provides superior high-frequency ripple current performance (180 mA @ 100 kHz) with the lowest seated height of 0.433" (11.00 mm), suitable for space-constrained applications.

Both direct equivalents are ROHS3 compliant and rated for identical operating conditions.

For Upgraded Voltage Rating:

UPW1V330MDD provides a 35 V rated voltage while maintaining all other critical parameters. This upgrade is suitable for applications requiring additional voltage margin or operating in circuits with higher transient voltage conditions. The 35 V rating provides 40% additional voltage headroom compared to the original 25 V specification. Physical dimensions and ripple current characteristics remain identical to UPW1E330MDD.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility with the original SEK330M025ST specification.

Frequently Asked Questions (FAQ)

Q: Can UPW1V330MDD (35 V) be used in place of SEK330M025ST (25 V)?

A: Yes. UPW1V330MDD is a direct mechanical and electrical substitute with upgraded voltage rating. The higher 35 V rating is compatible with 25 V circuit applications and provides additional voltage margin. All other parameters—capacitance, tolerance, lifetime, operating temperature, lead spacing, size, and mounting type—are identical.

Q: What is the difference between UPJ1E330MDD and UPW1E330MDD?

A: Both are direct equivalents to SEK330M025ST with identical capacitance, voltage, tolerance, and lifetime specifications. The primary differences are ripple current ratings and physical height. UPJ1E330MDD has higher low-frequency ripple current (88 mA @ 120 Hz) and seated height of 0.472" (12.00 mm). UPW1E330MDD has superior high-frequency ripple current (180 mA @ 100 kHz) and lower seated height of 0.433" (11.00 mm). Selection depends on circuit ripple current requirements and available PCB clearance.

Q: Are all substitute parts through-hole mounted with identical lead spacing?

A: Yes. All substitute parts maintain 0.079" (2.00 mm) lead spacing and through-hole mounting type, ensuring direct PCB footprint compatibility with SEK330M025ST.

Q: Do substitute parts meet the same environmental and regulatory standards?

A: Yes. All substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory status of SEK330M025ST.

Q: What is the significance of the 2000 Hrs @ 105°C lifetime rating?

A: This specification indicates the capacitor maintains its rated capacitance within tolerance after 2000 hours of continuous operation at 105°C. All substitute parts maintain this identical lifetime rating, ensuring equivalent reliability and service life in high-temperature applications.

Q: Can substitute parts be used interchangeably on existing PCBs designed for SEK330M025ST?

A: Yes, for UPJ1E330MDD and UPW1E330MDD. Both maintain identical lead spacing (0.079" / 2.00 mm) and can-style radial package. Physical height differences (0.472" and 0.433" respectively vs. 0.512" original) are smaller, providing additional clearance. UPW1V330MDD also maintains identical mechanical compatibility with the added benefit of higher voltage rating.

Q: What ripple current specification should be used for circuit design?

A: Use the ripple current rating corresponding to your circuit's operating frequency. For low-frequency applications (120 Hz), refer to the 120 Hz ripple current specification. For high-frequency applications, use the appropriate high-frequency rating (10 kHz or 100 kHz). UPW1E330MDD and UPW1V330MDD provide the highest high-frequency ripple current capability (180 mA @ 100 kHz).

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