ECO-S2GA121BA Equivalent & Substitute Parts

Part Overview

The Panasonic ECO-S2GA121BA is a 120 µF, 400 V aluminum electrolytic capacitor in radial, can snap-in package with a rated lifetime of 3000 hours at 105°C. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. The part operates across a temperature range of -25°C to 105°C and is suitable for general-purpose applications requiring 400 V rated voltage with ±20% capacitance tolerance.

Key Parameters

Parameter	Value
Capacitance	120 µF
Voltage Rating	400 V
Tolerance	±20%
Package Type	Radial, Can - Snap-In
Lead Spacing	0.394" (10.00 mm)
Diameter	0.866" (22.00 mm)
Mounting Type	Through Hole
Operating Temperature Range	-25°C to 105°C
Polarization	Polar
Application	General Purpose

Substitute Part Grouping Explanation

Substitution for the ECO-S2GA121BA is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters (Must Match):

Capacitance: 120 µF
Voltage Rating: 400 V
Tolerance: ±20%
Package Type: Radial, Can - Snap-In
Lead Spacing: 0.394" (10.00 mm)
Diameter: 0.866" (22.00 mm)
Mounting Type: Through Hole
Operating Temperature Range: -25°C to 105°C
Polarization: Polar

Allowable Variations:

Height (Seated Max): Substitute parts may have different heights provided they fit within the mechanical envelope of the application
Lifetime @ 105°C: Substitute parts with equal or greater lifetime ratings are acceptable
Ripple Current: Substitute parts with equal or greater ripple current ratings are acceptable
ESR: Not specified for substitute parts; original ESR of 1.105 Ohm @ 120 Hz is reference only
Product Status: Active substitute parts are preferred over obsolete originals

All nine substitute parts listed meet these criteria and are direct functional equivalents for the ECO-S2GA121BA.

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	Tolerance	Height (Max)	Lifetime @ 105°C	Ripple Current @ 120 Hz	Product Status
ECO-S2GA121BA	Panasonic	120 µF	400 V	±20%	1.654" (42.00 mm)	3000 Hrs	750 mA	Obsolete
400MXG120MEFCSN22X30	Rubycon	120 µF	400 V	±20%	1.260" (32.00 mm)	3000 Hrs	970 mA	Active
400VXG120MEFC22X30	Rubycon	120 µF	400 V	±20%	1.260" (32.00 mm)	5000 Hrs	960 mA	Active
400VXH120MEFC22X25	Rubycon	120 µF	400 V	±20%	1.063" (27.00 mm)	5000 Hrs	910 mA	Active
400VXH120MEFCSN22X25	Rubycon	120 µF	400 V	±20%	1.063" (27.00 mm)	5000 Hrs	910 mA	Active
EKMS401VSN121MP25S	Chemi-Con	120 µF	400 V	±20%	1.063" (27.00 mm)	3000 Hrs	770 mA	Active
ELXM401VSN121MP35S	Chemi-Con	120 µF	400 V	±20%	1.457" (37.00 mm)	7000 Hrs	790 mA	Active
ELXS401VSN121MP25S	Chemi-Con	120 µF	400 V	±20%	1.083" (27.50 mm)	5000 Hrs	770 mA	Active
LGR2G121MELZ40	Nichicon	120 µF	400 V	±20%	1.654" (42.00 mm)	10000 Hrs	750 mA	Active
LGU2G121MELZ	Nichicon	120 µF	400 V	±20%	1.378" (35.00 mm)	3000 Hrs	750 mA	Active
LGW2G121MELZ30	Nichicon	120 µF	400 V	±20%	1.181" (30.00 mm)	3000 Hrs	1.22 A	Active

Engineering Selection Recommendations

All listed substitute parts are active products from established manufacturers (Rubycon, Chemi-Con, Nichicon) and meet the electrical and mechanical requirements for direct substitution of the obsolete ECO-S2GA121BA.

Selection by Mechanical Fit:

Exact Height Match (1.654" / 42.00 mm): LGR2G121MELZ40 (Nichicon) provides identical height to the original part and offers extended lifetime of 10000 hours at 105°C.
Compact Height Options: Rubycon VXH series (400VXH120MEFC22X25, 400VXH120MEFCSN22X25) and Chemi-Con EKMS series (EKMS401VSN121MP25S) offer reduced heights of 1.063" to 1.083", suitable for space-constrained applications.
Mid-Range Height: Rubycon MXG and VXG series, Chemi-Con LXS series, and Nichicon LGU series provide heights between 1.260" and 1.378".

Selection by Lifetime Rating:

3000 Hours @ 105°C: 400MXG120MEFCSN22X30, EKMS401VSN121MP25S, LGU2G121MELZ, LGW2G121MELZ30 match the original lifetime specification.
5000 Hours @ 105°C: 400VXG120MEFC22X30, 400VXH120MEFC22X25, 400VXH120MEFCSN22X25, ELXS401VSN121MP25S provide extended reliability.
7000+ Hours @ 105°C: ELXM401VSN121MP35S (7000 hours) and LGR2G121MELZ40 (10000 hours) offer maximum operational longevity.

Compliance Status:

Rubycon parts: ROHS3 Compliant, REACH Unaffected
Chemi-Con parts: RoHS Compliant, REACH Unaffected
Nichicon parts: ROHS3 Compliant, REACH Unaffected

All substitute parts carry ECCN EAR99 and HTSUS 8532.22.0040 classifications matching the original part.

Frequently Asked Questions (FAQ)

Q: Can any of these substitute parts be used as a direct replacement for the ECO-S2GA121BA?

A: Yes. All nine substitute parts meet the critical electrical parameters: 120 µF capacitance, 400 V voltage rating, ±20% tolerance, and identical package type (radial, can snap-in) with 0.394" lead spacing and 0.866" diameter. Mechanical fit depends on available height clearance in your application.

Q: What is the primary difference between substitute parts?

A: The main differences are height (ranging from 1.063" to 1.654") and lifetime rating at 105°C (ranging from 3000 to 10000 hours). Ripple current ratings also vary slightly between manufacturers and series.

Q: Which substitute part has the same physical dimensions as the original ECO-S2GA121BA?

A: The Nichicon LGR2G121MELZ40 matches the original height of 1.654" (42.00 mm) and provides superior lifetime of 10000 hours at 105°C.

Q: Are there RoHS and REACH compliant options?

A: Yes. All substitute parts are RoHS compliant (either RoHS or ROHS3 standard) and REACH unaffected, meeting current environmental regulations.

Q: If my PCB has limited vertical space, which parts fit in compact designs?

A: The Rubycon VXH series (400VXH120MEFC22X25, 400VXH120MEFCSN22X25) and Chemi-Con EKMS401VSN121MP25S offer the smallest heights at 1.063" to 1.083", reducing overall assembly height while maintaining full electrical compatibility.

Q: Do all substitute parts have the same ripple current rating?

A: No. Ripple current varies by manufacturer and series. The Nichicon LGW2G121MELZ30 offers the highest ripple current at 1.22 A @ 120 Hz, while others range from 750 mA to 1.358 A depending on frequency and series.

Q: What is the difference between Rubycon MXG and VXG series?

A: The MXG series (400MXG120MEFCSN22X30) has a 3000-hour lifetime at 105°C, while the VXG series (400VXG120MEFC22X30) extends this to 5000 hours. Both maintain identical electrical specifications and similar physical dimensions.

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