ECO-S2EB391DA Equivalent & Substitute Parts

Part Overview

The ECO-S2EB391DA is a 390 µF, 250 V aluminum electrolytic capacitor manufactured by Panasonic Electronic Components in the TS-HB series. This radial, can-style snap-in capacitor is designed for general-purpose applications requiring 3000 hours of operational life at 105°C. The part is currently obsolete, making equivalent substitutes necessary for ongoing system support and component sourcing.

Key Parameters

Parameter	Value
Capacitance	390 µF
Voltage Rating	250 V
Tolerance	±20%
ESR @ 120 Hz	425 mOhm
Lifetime @ 105°C	3000 Hours
Operating Temperature Range	-40°C to 105°C
Ripple Current @ 120 Hz	1.3 A
Ripple Current @ 100 kHz	1.482 A
Lead Spacing	0.394" (10.00 mm)
Case Diameter	1.181" (30.00 mm)
Height	0.984" (25.00 mm)
Mounting Type	Through Hole
Package Style	Radial, Can - Snap-In
Polarization	Polar

Substitute Part Grouping Explanation

Substitution eligibility for the ECO-S2EB391DA is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters (Must Match):

Capacitance: 390 µF
Voltage Rating: 250 V
Tolerance: ±20%
Lead Spacing: 0.394" (10.00 mm)
Mounting Type: Through Hole
Package Style: Radial, Can - Snap-In
Polarization: Polar
Operating Temperature Range: -40°C to 105°C

Performance Parameters (Determine Substitution Class):

ESR @ 120 Hz
Lifetime @ 105°C
Ripple Current ratings
Physical dimensions (diameter and height)

Substitutes are grouped into two categories:

Direct Equivalents: Parts matching all critical parameters with identical or superior performance specifications (ESR, lifetime, ripple current).

Functional Equivalents: Parts matching all critical parameters but with variations in secondary performance metrics (ESR, lifetime, or ripple current ratings) that remain within acceptable operational ranges for general-purpose applications.

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	Tolerance	ESR @ 120 Hz	Lifetime @ 105°C	Ripple Current @ 120 Hz	Case Diameter	Height	Lead Spacing	Product Status
ECO-S2EB391DA	Panasonic	390 µF	250 V	±20%	425 mOhm	3000 Hrs	1.3 A	1.181" (30 mm)	0.984" (25 mm)	0.394" (10 mm)	Obsolete
381LQ391M250J012	Cornell Dubilier	390 µF	250 V	±20%	425 mOhm	2000 Hrs	1.3 A	0.984" (25 mm)	1.063" (27 mm)	0.394" (10 mm)	Active
381LX391M250H452	Cornell Dubilier	390 µF	250 V	±20%	—	3000 Hrs	1.3 A	0.866" (22 mm)	1.850" (47 mm)	0.394" (10 mm)	Active
381LX391M250J032	Cornell Dubilier	390 µF	250 V	±20%	—	3000 Hrs	1.3 A	0.984" (25 mm)	1.457" (37 mm)	0.394" (10 mm)	Active
LP391M250H3P3	Cornell Dubilier	390 µF	250 V	±20%	640 mOhm	1000 Hrs	1.09 A	1.378" (35 mm)	1.181" (30 mm)	0.394" (10 mm)	Active
LGU2E391MELB	Nichicon	390 µF	250 V	±20%	—	3000 Hrs	1.49 A	1.181" (30 mm)	0.984" (25 mm)	0.394" (10 mm)	Active

Engineering Selection Recommendations

Preferred Substitutes (Active Status, Matching Dimensions):

The LGU2E391MELB (Nichicon, LGU series) is the primary recommended substitute. It matches the original part's physical dimensions (1.181" diameter × 0.984" height), maintains 3000-hour lifetime at 105°C, and is currently in active production with ROHS3 compliance. This part provides direct mechanical and electrical compatibility with minimal design modification risk.

The 381LX391M250J032 (Cornell Dubilier, 381LX series) is an alternative active substitute with matching capacitance, voltage, and tolerance specifications. It maintains 3000-hour lifetime and is available in bulk packaging. Physical dimensions differ (0.984" diameter × 1.457" height), requiring verification of available mounting space.

Secondary Substitutes (Active Status, Performance Variations):

The 381LQ391M250J012 (Cornell Dubilier, 381LQ series) is an active substitute with identical ESR and ripple current specifications but reduced lifetime (2000 hours versus 3000 hours at 105°C). Physical dimensions differ slightly (0.984" diameter × 1.063" height). This part is suitable for applications where extended thermal life is not critical.

The LP391M250H3P3 (Cornell Dubilier, LP series) is an active substitute with reduced performance specifications: higher ESR (640 mOhm versus 425 mOhm), lower lifetime (1000 hours versus 3000 hours), and lower ripple current rating (1.09 A versus 1.3 A at 120 Hz). Physical dimensions differ significantly (1.378" diameter × 1.181" height). This part is suitable only for applications with relaxed thermal and ripple current requirements.

Compliance Considerations:

All recommended substitutes carry ROHS3 compliance and EAR99 ECCN classification, matching the original part's regulatory status. The LGU2E391MELB carries REACH Unaffected status, while Cornell Dubilier parts carry REACH Unaffected status, providing regulatory alignment for international applications.

Frequently Asked Questions (FAQ)

Q: Can the 381LX391M250J032 be used as a direct replacement for the ECO-S2EB391DA?

A: The 381LX391M250J032 meets all critical electrical parameters (390 µF, 250 V, ±20% tolerance, 3000-hour lifetime at 105°C) and mechanical parameters (lead spacing, through-hole mounting, snap-in package). However, its physical dimensions differ: 0.984" diameter × 1.457" height versus the original 1.181" diameter × 0.984" height. Verify available mounting space in your application before selection.

Q: What is the difference between the LGU2E391MELB and 381LX391M250J032?

A: Both parts maintain 3000-hour lifetime at 105°C and match all critical electrical specifications. The LGU2E391MELB (Nichicon) matches the original part's physical dimensions exactly (1.181" diameter × 0.984" height), while the 381LX391M250J032 (Cornell Dubilier) has a taller profile (1.457" height). The LGU2E391MELB is preferred for direct mechanical compatibility.

Q: Is the LP391M250H3P3 suitable for my application?

A: The LP391M250H3P3 meets basic electrical specifications but has reduced performance: 1000-hour lifetime (versus 3000 hours), higher ESR (640 mOhm versus 425 mOhm), and lower ripple current rating (1.09 A versus 1.3 A at 120 Hz). Use this part only if your application does not require extended thermal life or high ripple current handling.

Q: Why does the 381LQ391M250J012 have a shorter lifetime than other substitutes?

A: The 381LQ391M250J012 is rated for 2000 hours at 105°C, compared to 3000 hours for the original part and other substitutes. This reduced lifetime reflects different internal construction and materials in the Cornell Dubilier 381LQ series. Select this part only if your application's thermal cycling requirements do not exceed 2000 hours at 105°C.

Q: Are all substitutes available in the same packaging format?

A: All substitutes use radial, can-style snap-in packages with through-hole mounting and 0.394" (10 mm) lead spacing. However, packaging availability varies: the LGU2E391MELB and 381LX391M250J032 are available in bulk packaging, while others may have different packaging options. Verify packaging availability with your supplier.

Q: What compliance certifications do these substitutes carry?

A: All recommended substitutes carry ROHS3 compliance and EAR99 ECCN classification. The LGU2E391MELB and Cornell Dubilier parts carry REACH Unaffected status, providing regulatory alignment with the original part's REACH Affected status for international applications.

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