SK331M160ST Equivalent & Substitute Parts

Part Overview

The SK331M160ST is a 330 µF, 160 V aluminum electrolytic capacitor in a radial, can package manufactured by Cornell Dubilier Electronics (CDE). This component is classified as Active and serves general-purpose applications requiring stable capacitance and voltage handling across industrial temperature ranges. The SK series capacitor features a rated lifetime of 2000 hours at 85°C with an operating temperature range of -25°C to 85°C. Substitute components become necessary when SK331M160ST availability is limited, when inventory constraints require sourcing alternatives, or when design flexibility permits component selection from qualified equivalents that meet the same electrical and mechanical specifications.

Key Parameters

Parameter	Specification
Capacitance	330 µF
Voltage Rating	160 V
Tolerance	±20%
Package Type	Radial, Can
Lead Spacing	0.295" (7.50 mm)
Diameter	0.709" (18.00 mm)
Mounting Type	Through Hole
Polarization	Polar
RoHS Status	ROHS3 Compliant
Operating Temperature Range	-25°C to 85°C

Substitute Part Grouping Explanation

Substitute parts for the SK331M160ST are qualified based on the following mandatory electrical and mechanical parameters:

Electrical Parameters:

Capacitance: 330 µF (exact match required)
Voltage Rating: 160 V (exact match required)
Tolerance: ±20% (exact match required)
Polarization: Polar (exact match required)

Mechanical Parameters:

Package Type: Radial, Can (exact match required)
Lead Spacing: 0.295" (7.50 mm) (exact match required)
Diameter: 0.709" (18.00 mm) (exact match required)
Mounting Type: Through Hole (exact match required)

Compliance Parameters:

RoHS Status: ROHS3 Compliant (exact match required)
ECCN: EAR99 (exact match required)

All substitute parts listed below meet these mandatory criteria and are electrically and mechanically interchangeable with the SK331M160ST in through-hole PCB applications.

Parameter Comparison

Parameter	SK331M160ST (CDE)	ECA-2CM331 (Panasonic)	UCS2C331MHD (Nichicon)
Capacitance	330 µF	330 µF	330 µF
Voltage Rating	160 V	160 V	160 V
Tolerance	±20%	±20%	±20%
Lead Spacing	0.295" (7.50 mm)	0.295" (7.50 mm)	0.295" (7.50 mm)
Diameter	0.709" (18.00 mm)	0.709" (18.00 mm)	0.709" (18.00 mm)
Height - Seated (Max)	1.732" (44.00 mm)	1.319" (33.50 mm)	1.299" (33.00 mm)
Package Type	Radial, Can	Radial, Can	Radial, Can
Mounting Type	Through Hole	Through Hole	Through Hole
Polarization	Polar	Polar	Polar
Operating Temperature Range	-25°C to 85°C	-25°C to 85°C	-40°C to 105°C
Lifetime @ Rated Temp	2000 Hrs @ 85°C	2000 Hrs @ 85°C	10000 Hrs @ 105°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Obsolete	Active

Engineering Selection Recommendations

SK331M160ST (Primary Component): This part is Active and ROHS3 compliant with EAR99 classification. It is the primary selection for new designs and applications where CDE components are specified or preferred.

ECA-2CM331 (Panasonic): This substitute is ROHS3 compliant and carries EAR99 classification. However, its Product Status is Obsolete, indicating reduced long-term availability. This part is suitable for legacy system repairs or applications where inventory is available, but not recommended as a primary selection for new designs due to obsolescence.

UCS2C331MHD (Nichicon): This substitute is Active and ROHS3 compliant with EAR99 classification. The UCS2C331MHD provides extended operating temperature range (-40°C to 105°C) and superior lifetime rating (10000 Hrs @ 105°C) compared to the primary component. This part is suitable for applications requiring enhanced thermal performance and extended component life while maintaining full electrical and mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can ECA-2CM331 be used as a direct replacement for SK331M160ST? A: The ECA-2CM331 meets all mandatory electrical and mechanical substitution criteria, including capacitance, voltage rating, tolerance, package dimensions, and lead spacing. However, its Obsolete status limits future availability. Use only when ECA-2CM331 inventory is confirmed available.

Q: What is the key difference between the substitute parts and the original SK331M160ST? A: The primary differences are product status and height specifications. The SK331M160ST has a maximum seated height of 1.732" (44.00 mm), while both substitutes are shorter at 1.319" to 1.299". This height reduction may offer board layout advantages. The UCS2C331MHD additionally provides superior thermal performance and lifetime rating.

Q: Is UCS2C331MHD suitable for designs originally specified for SK331M160ST? A: Yes, the UCS2C331MHD is electrically and mechanically compatible with identical capacitance, voltage rating, tolerance, lead spacing, diameter, and polarization. The extended temperature range and increased lifetime represent improvements over the original specification. Height reduction from 1.732" to 1.299" must be confirmed compatible with your PCB layout.

Q: Are all listed substitutes RoHS and REACH compliant? A: All listed parts (SK331M160ST, ECA-2CM331, and UCS2C331MHD) are ROHS3 Compliant and REACH Unaffected, meeting regulatory requirements for electronic component use.

Q: What mounting considerations apply to these parts? A: All three parts are Through Hole mounted components with identical lead spacing (0.295" / 7.50 mm) and diameter (0.709" / 18.00 mm). PCB footprints specified for the SK331M160ST are directly compatible with both substitute parts. Verify PCB height clearance accommodates the mounted component height after soldering.

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