SEK3R3M050ST Equivalent & Substitute Parts

Part Overview

The SEK3R3M050ST is a 3.3 µF, 50 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in radial, can package configuration. This component is classified as Active product status and is designed for general-purpose applications requiring through-hole mounting. The part operates across a temperature range of -55°C to 105°C with a rated lifetime of 2000 hours at 105°C.

Substitute parts become necessary when the primary manufacturer part is unavailable, when inventory constraints require alternative sourcing, or when design flexibility permits equivalent electrical and mechanical specifications. The identification of suitable substitutes is based strictly on matching critical electrical parameters, physical dimensions, and compliance certifications.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Capacitance	3.3	µF	Critical - Must match exactly
Voltage - Rated	50	V	Critical - Must match or exceed
Tolerance	±20%	%	Critical - Must match
Operating Temperature Range	-55°C to 105°C	°C	Critical - Must encompass or match
Lifetime @ Temperature	2000	Hrs @ 105°C	Important - Reliability indicator
Lead Spacing	0.079"	(2.00 mm)	Critical - PCB footprint compatibility
Size / Dimension	0.197" Dia	(5.00 mm)	Important - Physical fit
Mounting Type	Through Hole	-	Critical - Assembly method
Package / Case	Radial, Can	-	Critical - Form factor
RoHS Status	ROHS3 Compliant	-	Important - Regulatory compliance

Substitute Part Grouping Explanation

Substitution logic for the SEK3R3M050ST is determined by strict equivalence across the following parameters:

Electrical Equivalence Requirements:

Capacitance value must equal 3.3 µF
Rated voltage must equal 50 V
Tolerance must equal ±20%
Operating temperature range must encompass -55°C to 105°C
Lifetime rating must equal or exceed 2000 hours at 105°C

Mechanical Equivalence Requirements:

Lead spacing must equal 0.079" (2.00 mm)
Diameter must equal 0.197" (5.00 mm)
Mounting type must be Through Hole
Package configuration must be Radial, Can

Compliance Requirements:

RoHS3 Compliance status must be maintained
REACH Unaffected status must be maintained

The substitute part UPW1H3R3MDD, manufactured by Nichicon, meets all electrical and mechanical equivalence criteria. However, the UPW1H3R3MDD carries Obsolete product status, which represents a significant consideration for long-term supply chain reliability.

Parameter Comparison

Parameter	SEK3R3M050ST (CDE)	UPW1H3R3MDD (Nichicon)	Match Status
Capacitance	3.3 µF	3.3 µF	Equivalent
Voltage - Rated	50 V	50 V	Equivalent
Tolerance	±20%	±20%	Equivalent
Operating Temperature Range	-55°C to 105°C	-55°C to 105°C	Equivalent
Lifetime @ Temperature	2000 Hrs @ 105°C	2000 Hrs @ 105°C	Equivalent
Lead Spacing	0.079" (2.00 mm)	0.079" (2.00 mm)	Equivalent
Size / Dimension	0.197" Dia (5.00 mm)	0.197" Dia (5.00 mm)	Equivalent
Height - Seated (Max)	0.512" (13.00 mm)	0.433" (11.00 mm)	UPW1H3R3MDD is shorter
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	Radial, Can	Radial, Can	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent
Product Status	Active	Obsolete	Different

Engineering Selection Recommendations

Primary Selection: SEK3R3M050ST

The SEK3R3M050ST maintains Active product status with 869 units in current inventory. This part carries full ROHS3 compliance and REACH Unaffected certification. For new designs and applications requiring long-term supply chain stability, the SEK3R3M050ST is the recommended selection.

Alternative Selection: UPW1H3R3MDD

The UPW1H3R3MDD provides electrical and mechanical equivalence across all critical parameters. However, this part carries Obsolete product status with 6030 units available in inventory. The UPW1H3R3MDD is suitable for replacement applications, legacy system repairs, or situations where immediate availability is prioritized over long-term supply assurance. The physical height difference of 0.079" (2.00 mm) must be verified against PCB clearance constraints before selection.

Both parts maintain identical RoHS3 and REACH compliance certifications, ensuring regulatory equivalence for applications subject to these standards.

Frequently Asked Questions (FAQ)

Q: Can UPW1H3R3MDD be used as a direct replacement for SEK3R3M050ST in new designs?

A: UPW1H3R3MDD meets all electrical and mechanical equivalence criteria. However, the Obsolete product status indicates discontinued manufacturing. For new designs, SEK3R3M050ST is recommended due to Active status and ongoing availability. UPW1H3R3MDD is suitable for replacement applications where existing inventory exists.

Q: What is the significance of the height difference between these parts?

A: SEK3R3M050ST has a maximum seated height of 0.512" (13.00 mm), while UPW1H3R3MDD measures 0.433" (11.00 mm). This 0.079" difference must be evaluated against PCB layout constraints, component clearance requirements, and enclosure dimensions. Both parts share identical lead spacing and diameter, so PCB footprints are compatible.

Q: Are both parts suitable for applications requiring ROHS3 compliance?

A: Yes. Both SEK3R3M050ST and UPW1H3R3MDD carry ROHS3 Compliant certification and REACH Unaffected status, making them suitable for applications subject to these regulatory requirements.

Q: What electrical parameters must match exactly for substitution?

A: Capacitance (3.3 µF), rated voltage (50 V), and tolerance (±20%) must match exactly. Operating temperature range must encompass -55°C to 105°C, and lifetime rating must equal or exceed 2000 hours at 105°C.

Q: Why is product status relevant to part selection?

A: Product status indicates manufacturing continuity and supply chain reliability. Active status (SEK3R3M050ST) ensures ongoing production and availability. Obsolete status (UPW1H3R3MDD) indicates discontinued manufacturing, making it suitable only for replacement applications or when existing inventory is available.

Q: Are the ripple current and impedance specifications of UPW1H3R3MDD relevant to substitution?

A: These parameters are provided for the UPW1H3R3MDD but not specified for the SEK3R3M050ST. Substitution equivalence is based on matching the parameters explicitly provided for both parts. If ripple current or impedance specifications are critical to the application, these must be verified against design requirements independently.

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