ECO-S2GA391EA Equivalent & Substitute Parts

Part Overview

The ECO-S2GA391EA is a 390 µF, 400 V aluminum electrolytic capacitor in radial, can snap-in package manufactured by Panasonic Electronic Components. 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 with a rated lifetime of 3000 hours at 105°C, suitable for general-purpose applications requiring stable capacitance and low equivalent series resistance.

Key Parameters

Parameter	Value
Capacitance	390 µF
Tolerance	±20%
Voltage Rating	400 V
ESR @ 120 Hz	340 mOhm
Lifetime @ 105°C	3000 Hrs
Operating Temperature	-25°C ~ 105°C
Lead Spacing	0.394" (10.00 mm)
Diameter	1.378" (35.00 mm)
Package Type	Radial, Can - Snap-In
Mounting Type	Through Hole
Polarization	Polar

Substitute Part Grouping Explanation

Substitute parts for the ECO-S2GA391EA are qualified based on the following mandatory electrical and mechanical parameters:

Core Substitution Criteria:

Capacitance: 390 µF (exact match required)
Tolerance: ±20% (exact match required)
Voltage Rating: 400 V (exact match required)
Package Type: Radial, Can - Snap-In (exact match required)
Lead Spacing: 0.394" (10.00 mm) (exact match required)
Diameter: 1.378" (35.00 mm) (exact match required)
Mounting Type: Through Hole (exact match required)
Polarization: Polar (exact match required)
Operating Temperature Range: -25°C ~ 105°C (exact match required)

Variable Parameters Allowing Substitution:

Height - Seated (Max): Acceptable range 1.260" to 1.850" (32.00 mm to 47.00 mm)
ESR @ 120 Hz: Acceptable range 340 mOhm to 1.06273 Ohm
Lifetime @ 105°C: Acceptable range 3000 Hrs to 10000 Hrs
Ripple Current @ Low Frequency: Acceptable range 1.55 A to 2.52 A @ 120 Hz
Ripple Current @ High Frequency: Acceptable range 2.17 A to 4.628 A (frequency dependent)

All substitute parts listed maintain identical core electrical specifications while offering variations in physical height, ESR characteristics, and operational lifetime to accommodate different application requirements.

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	ESR @ 120 Hz	Lifetime @ 105°C	Height (Max)	Status	RoHS
ECO-S2GA391EA	Panasonic	390 µF	400 V	340 mOhm	3000 Hrs	1.850" (47.00 mm)	Obsolete	REACH Affected
381LR391M400A032	Cornell Dubilier Electronics	390 µF	400 V	340 mOhm	3000 Hrs	1.457" (37.00 mm)	Active	ROHS3 Compliant
381LX391M400A042	Cornell Dubilier Electronics	390 µF	400 V	—	3000 Hrs	1.654" (42.00 mm)	Active	ROHS3 Compliant
397LMB400M2EE	Cornell Dubilier / Illinois Capacitor	390 µF	400 V	1.06273 Ohm	3000 Hrs	1.457" (37.00 mm)	Active	ROHS3 Compliant
397LMX400M2EE	Cornell Dubilier / Illinois Capacitor	390 µF	400 V	1.0048 Ohm	5000 Hrs	1.457" (37.00 mm)	Active	ROHS3 Compliant
397LMX400M2EG	Cornell Dubilier / Illinois Capacitor	390 µF	400 V	1.0048 Ohm	5000 Hrs	1.850" (47.00 mm)	Active	ROHS3 Compliant
400HXG390MEFC35X35	Rubycon	390 µF	400 V	—	3000 Hrs	1.457" (37.00 mm)	Active	ROHS3 Compliant
400MXG390MEFCSN35X30	Rubycon	390 µF	400 V	—	3000 Hrs	1.260" (32.00 mm)	Active	ROHS3 Compliant
400NXG390MEFC35X35	Rubycon	390 µF	400 V	—	10000 Hrs	1.457" (37.00 mm)	Active	ROHS3 Compliant
400VXG390MEFC35X35	Rubycon	390 µF	400 V	—	5000 Hrs	1.457" (37.00 mm)	Active	RoHS non-compliant
400VXG390MEFCSN35X35	Rubycon	390 µF	400 V	—	5000 Hrs	1.457" (37.00 mm)	Active	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts maintain identical core electrical specifications (390 µF, ±20%, 400 V) and mechanical compatibility (radial snap-in package, 10.00 mm lead spacing, 35.00 mm diameter, through-hole mounting). Selection among active alternatives depends on application-specific requirements:

For RoHS3 Compliance Requirements: Select from Cornell Dubilier Electronics (381LR391M400A032, 381LX391M400A042, 397LMB400M2EE, 397LMX400M2EE, 397LMX400M2EG) or Rubycon (400HXG390MEFC35X35, 400MXG390MEFCSN35X30, 400NXG390MEFC35X35, 400VXG390MEFCSN35X35). Avoid 400VXG390MEFC35X35 if RoHS compliance is mandatory.

For Extended Operational Lifetime: The 400NXG390MEFC35X35 (Rubycon) offers 10000 hours at 105°C, compared to 3000 hours for the original part. The 397LMX series (Cornell Dubilier / Illinois Capacitor) provides 5000 hours at 105°C.

For Compact PCB Layouts: The 400MXG390MEFCSN35X30 (Rubycon) features the minimum seated height of 1.260" (32.00 mm), enabling space-constrained designs.

For Height-Matched Replacement: The 397LMX400M2EG (Cornell Dubilier / Illinois Capacitor) matches the original 1.850" (47.00 mm) seated height while offering extended 5000-hour lifetime and improved ESR characteristics.

Frequently Asked Questions (FAQ)

Q: Can I substitute the ECO-S2GA391EA with any of the listed parts?

A: Yes, all listed parts are electrically and mechanically equivalent. They share identical capacitance (390 µF), tolerance (±20%), voltage rating (400 V), package type (radial snap-in), lead spacing (10.00 mm), diameter (35.00 mm), and operating temperature range (-25°C to 105°C). Differences in height, ESR, and lifetime do not affect basic substitutability but may impact specific application performance.

Q: What is the significance of the height variation among substitute parts?

A: Seated height ranges from 1.260" (32.00 mm) to 1.850" (47.00 mm). The original ECO-S2GA391EA measures 1.850" (47.00 mm). Shorter alternatives (1.260" to 1.654") reduce PCB footprint height, beneficial for compact designs. Taller or matching-height options ensure direct mechanical compatibility with existing board layouts and clearance requirements.

Q: Why do some substitute parts show no ESR value?

A: ESR data was not provided in the input specifications for certain parts. Parts with specified ESR values (Cornell Dubilier 381LR391M400A032 at 340 mOhm and 397LMB400M2EE at 1.06273 Ohm) offer documented low-frequency impedance characteristics. Absence of ESR specification does not indicate inferior performance; it reflects available technical documentation.

Q: Which substitute offers the best long-term reliability?

A: The 400NXG390MEFC35X35 (Rubycon, NXG series) provides 10000 hours at 105°C, the highest rated lifetime among all alternatives. The 397LMX series (Cornell Dubilier / Illinois Capacitor) offers 5000 hours at 105°C. The original part and most alternatives are rated for 3000 hours at 105°C.

Q: Are all substitute parts RoHS compliant?

A: Most substitute parts are ROHS3 compliant. The exception is 400VXG390MEFC35X35 (Rubycon, VXG series), which is RoHS non-compliant. For applications requiring RoHS compliance, select from the remaining nine alternatives.

Q: Can I use these parts interchangeably on the same PCB?

A: Yes, provided your PCB layout accommodates the height variation. The original part and 397LMX400M2EG both measure 1.850" (47.00 mm) seated height, ensuring direct replacement. Shorter alternatives require verification of clearance above the capacitor location. All parts maintain identical lead spacing (10.00 mm) and diameter (35.00 mm), ensuring footprint compatibility.

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