ECO-S2WB121CA Equivalent & Substitute Parts

Part Overview

The ECO-S2WB121CA is a 120 µF, 450 V aluminum electrolytic capacitor manufactured by Panasonic Electronic Components in the TS-HB series. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring this capacitance and voltage rating.

The part is designed for general-purpose applications with a radial, can snap-in package configuration suitable for through-hole mounting. With a rated lifetime of 3000 hours at 105°C and an operating temperature range of -25°C to 105°C, this capacitor serves applications requiring stable performance across extended temperature ranges.

Key Parameters

Parameter	Value
Capacitance	120 µF
Voltage Rating	450 V
Tolerance	±20%
Package Type	Radial, Can - Snap-In
Lead Spacing	0.394" (10.00 mm)
Mounting Type	Through Hole
Operating Temperature Range	-25°C to 105°C
Lifetime @ Temperature	3000 Hrs @ 105°C
Polarization	Polar
Application	General Purpose

Substitute Part Grouping Explanation

Substitution for the ECO-S2WB121CA is determined by strict adherence to the following electrical and mechanical parameters:

Core Substitution Criteria:

Capacitance: 120 µF (exact match required)
Voltage Rating: 450 V (exact match required)
Tolerance: ±20% (exact match required)
Package Type: Radial, Can - Snap-In (exact match required)
Lead Spacing: 0.394" (10.00 mm) (exact match required)
Mounting Type: Through Hole (exact match required)
Operating Temperature Range: -25°C to 105°C (exact match required)
Polarization: Polar (exact match required)

Secondary Compatibility Parameters:

Lifetime @ 105°C: 3000 hours minimum
Size/Dimension: 0.984" diameter (25.00 mm) (exact match required)
Ripple Current capability at operating frequencies

All substitute parts listed meet these criteria. Variations in height, ESR, and ripple current ratings are acceptable provided they do not degrade system performance.

Parameter Comparison

Parameter	ECO-S2WB121CA (Panasonic)	381LX121M450J032 (CDE)	LGU2W121MELA (Nichicon)	LGW2W121MELA30 (Nichicon)	381LQ121M450H032 (CDE)
Manufacturer	Panasonic	Cornell Dubilier Electronics	Nichicon	Nichicon	Cornell Dubilier Electronics
Series	TS-HB	381LX	LGU	LGW	381LQ
Product Status	Obsolete	Active	Active	Active	Active
Capacitance	120 µF	120 µF	120 µF	120 µF	120 µF
Voltage Rating	450 V	450 V	450 V	450 V	450 V
Tolerance	±20%	±20%	±20%	±20%	±20%
ESR @ 120 Hz	1.382 Ω	Not specified	Not specified	Not specified	1.52 Ω
Lifetime @ 105°C	3000 Hrs	3000 Hrs	3000 Hrs	3000 Hrs	2000 Hrs
Operating Temperature	-25°C to 105°C	-25°C to 105°C	-25°C to 105°C	-25°C to 105°C	-25°C to 105°C
Lead Spacing	0.394" (10.00 mm)	0.394" (10.00 mm)	0.394" (10.00 mm)	0.394" (10.00 mm)	0.394" (10.00 mm)
Size / Diameter	0.984" (25.00 mm)	0.984" (25.00 mm)	0.984" (25.00 mm)	0.984" (25.00 mm)	0.866" (22.00 mm)
Height (Max)	1.378" (35.00 mm)	1.457" (37.00 mm)	1.181" (30.00 mm)	1.181" (30.00 mm)	1.457" (37.00 mm)
Package Type	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Affected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Ripple Current @ 120 Hz	720 mA	700 mA	800 mA	1.22 A	700 mA
Ripple Current @ High Frequency	820.8 mA @ 100 kHz	1 A @ 20 kHz	1.144 A @ 50 kHz	1.7446 A @ 50 kHz	1 A @ 20 kHz

Engineering Selection Recommendations

Direct Substitutes (Active Status, Full Compliance):

The 381LX121M450J032 (Cornell Dubilier Electronics), LGU2W121MELA (Nichicon), and LGW2W121MELA30 (Nichicon) are active production parts with ROHS3 compliance and REACH unaffected status. These parts meet all electrical and mechanical substitution criteria and are recommended for new designs and ongoing system support where regulatory compliance is required.

Alternative Substitute (Active Status, Reduced Lifetime):

The 381LQ121M450H032 (Cornell Dubilier Electronics) is an active production part with ROHS3 compliance and REACH unaffected status. This part meets all electrical and mechanical substitution criteria with the exception of a reduced lifetime rating of 2000 hours at 105°C compared to the 3000-hour specification of the original part. This part is suitable for applications where the reduced lifetime does not impact system reliability requirements.

Dimensional Considerations:

The 381LQ121M450H032 has a reduced diameter of 0.866" (22.00 mm) compared to the standard 0.984" (25.00 mm) diameter of other substitutes. PCB layout verification is required to confirm fit within existing mounting footprints.

Compliance Status:

All active substitute parts are ROHS3 compliant and REACH unaffected, providing regulatory advantages over the obsolete ECO-S2WB121CA, which is REACH affected.

Frequently Asked Questions (FAQ)

Q: Can I use 381LQ121M450H032 as a direct replacement for ECO-S2WB121CA?

A: The 381LQ121M450H032 meets all electrical and mechanical substitution criteria. However, it has a reduced lifetime rating of 2000 hours at 105°C versus 3000 hours for the original part. Verify that your application's thermal stress profile and expected service life are compatible with this reduced rating.

Q: What is the difference between the Nichicon LGU2W121MELA and LGW2W121MELA30 substitutes?

A: Both parts are electrically equivalent with identical capacitance, voltage, tolerance, and operating temperature specifications. The primary differences are in ripple current capability and physical height. The LGW2W121MELA30 provides higher ripple current ratings (1.22 A @ 120 Hz and 1.7446 A @ 50 kHz) compared to the LGU2W121MELA (800 mA @ 120 Hz and 1.144 A @ 50 kHz). Both have the same maximum height of 1.181" (30.00 mm), which is shorter than the original part.

Q: Are there any PCB layout changes required when substituting these parts?

A: All substitute parts maintain the same lead spacing of 0.394" (10.00 mm) and mounting type (through-hole). However, physical height and diameter variations exist. The LGU2W121MELA and LGW2W121MELA30 are shorter (1.181" vs. 1.378" original height), and the 381LQ121M450H032 has a reduced diameter (0.866" vs. 0.984"). Verify that component clearances and mounting footprints accommodate these dimensional variations.

Q: Which substitute part should I select for new designs?

A: For new designs requiring maximum performance and compliance, select either the LGU2W121MELA or LGW2W121MELA30 (Nichicon) or the 381LX121M450J032 (Cornell Dubilier Electronics). All three are active production parts with ROHS3 compliance and REACH unaffected status. Choose based on ripple current requirements and available PCB space.

Q: What is the impact of the REACH affected status on the ECO-S2WB121CA?

A: The ECO-S2WB121CA is classified as REACH affected, indicating it may contain substances of concern under REACH regulations. All active substitute parts listed are REACH unaffected, providing regulatory compliance advantages for systems subject to REACH requirements.

Q: Can I mix different substitute parts in the same system?

A: Yes, all substitute parts meet the same electrical and mechanical specifications and can be used interchangeably within the same system. However, verify that physical height and diameter variations do not create assembly or clearance conflicts in your specific PCB layout.

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