ECO-S2EB122EA Equivalent & Substitute Parts

Part Overview

The ECO-S2EB122EA is a 1200 µF, 250 V aluminum electrolytic capacitor in radial, can snap-in package manufactured by Panasonic Electronic Components. This component is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. The part operates across a temperature range of -40°C to 105°C with a 3000-hour lifetime rating at 105°C, suitable for general-purpose filtering and energy storage in power supply circuits.

Key Parameters

Parameter	Value
Capacitance	1200 µF
Tolerance	±20%
Voltage Rating	250 V
ESR @ 120Hz	166 mOhm
Lifetime @ 105°C	3000 Hrs
Operating Temperature	-40°C ~ 105°C
Ripple Current @ 120Hz	2.3 A
Lead Spacing	0.394" (10.00 mm)
Case Diameter	1.378" (35.00 mm)
Height	1.772" (45.00 mm)
Package Type	Radial, Can - Snap-In
Mounting Type	Through Hole
Polarization	Polar

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following electrical and mechanical parameters:

Critical Parameters (Must Match):

Capacitance: 1200 µF
Voltage Rating: 250 V
Tolerance: ±20%
Polarization: Polar
Package Type: Radial, Can - Snap-In
Mounting Type: Through Hole
Lead Spacing: 0.394" (10.00 mm)
Case Diameter: 1.378" (35.00 mm)

Compatible Parameters (Within Acceptable Range):

Operating Temperature: -40°C to 105°C minimum
Lifetime @ 105°C: 3000 Hrs or greater
Ripple Current @ 120Hz: 2.3 A or greater
Height: Seated height up to 1.850" (47.00 mm) acceptable for standard through-hole mounting

Substitution Categories:

Direct Equivalents – Identical electrical and mechanical specifications:

381LX122M250A452 (Cornell Dubilier Electronics)
B43508F2128M000 (EPCOS - TDK Electronics)
LGN2E122MELC40 (Nichicon)

Compatible Alternatives – Meet all critical parameters with minor variations in secondary characteristics:

LGW2E122MELC40 (Nichicon) – Enhanced ripple current capability
381LR122M250A452 (Cornell Dubilier Electronics) – Lower ESR, enhanced ripple current
LGU2E122MELC (Nichicon) – Parametric equivalent with standard performance

Similar Parts – Meet core electrical specifications with dimensional or lifetime variations:

381LQ122M250K452 (Cornell Dubilier Electronics) – Reduced case diameter, 2000-hour lifetime
383LX122M250A052 (Cornell Dubilier Electronics) – 4-lead configuration, increased height
LP122M250H9P3 (Cornell Dubilier Electronics) – 1000-hour lifetime rating
SLP122M250H4P3 (Cornell Dubilier Electronics) – Narrower operating temperature range

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	Tolerance	ESR @ 120Hz	Lifetime @ 105°C	Case Dia	Height	Product Status	RoHS Status
ECO-S2EB122EA	Panasonic	1200 µF	250 V	±20%	166 mOhm	3000 Hrs	1.378"	1.772"	Obsolete	Not Specified
381LX122M250A452	Cornell Dubilier	1200 µF	250 V	±20%	Not Specified	3000 Hrs	1.378"	1.850"	Active	ROHS3
B43508F2128M000	EPCOS - TDK	1200 µF	250 V	±20%	100 mOhm	3000 Hrs	1.378"	1.457"	Active	ROHS3
LGN2E122MELC40	Nichicon	1200 µF	250 V	±20%	Not Specified	3000 Hrs	1.378"	1.654"	Active	ROHS3
LGW2E122MELC40	Nichicon	1200 µF	250 V	±20%	Not Specified	3000 Hrs	1.378"	1.575"	Active	ROHS3
381LR122M250A452	Cornell Dubilier	1200 µF	250 V	±20%	124 mOhm	3000 Hrs	1.378"	1.850"	Active	ROHS3
LGU2E122MELC	Nichicon	1200 µF	250 V	±20%	Not Specified	3000 Hrs	1.378"	1.772"	Active	ROHS3
381LQ122M250K452	Cornell Dubilier	1200 µF	250 V	±20%	138 mOhm	2000 Hrs	1.181"	1.850"	Active	ROHS3
383LX122M250A052	Cornell Dubilier	1200 µF	250 V	±20%	Not Specified	3000 Hrs	1.378"	2.047"	Active	ROHS3
LP122M250H9P3	Cornell Dubilier	1200 µF	250 V	±20%	165 mOhm	1000 Hrs	1.378"	1.969"	Active	ROHS3
SLP122M250H4P3	Cornell Dubilier	1200 µF	250 V	±20%	166 mOhm	3000 Hrs	1.378"	1.772"	Active	ROHS3

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

381LX122M250A452, B43508F2128M000, and LGN2E122MELC40 are active production parts meeting all critical electrical and mechanical parameters. All three carry ROHS3 compliance certification. B43508F2128M000 offers the lowest ESR at 100 mOhm and the most compact height at 1.457", providing superior performance in applications sensitive to impedance. 381LX122M250A452 and LGN2E122MELC40 maintain identical dimensional and electrical specifications to the original part.

Secondary Substitutes (Compatible with Application Review):

LGW2E122MELC40 and LGU2E122MELC provide active alternatives with ROHS3 compliance. LGW2E122MELC40 delivers enhanced ripple current capability (3.45 A @ 120Hz and 5.175 A @ 50kHz) suitable for high-ripple applications. LGU2E122MELC matches the original height specification at 1.772" and maintains 3000-hour lifetime rating.

381LR122M250A452 offers lower ESR (124 mOhm) and higher ripple current (3.13 A @ 120Hz) for applications requiring improved thermal performance and current handling.

Conditional Substitutes (Application-Dependent):

381LQ122M250K452 features a reduced case diameter (1.181") but carries a 2000-hour lifetime rating, making it suitable only for applications with relaxed lifetime requirements or where space constraints justify the reduced operational duration.

LP122M250H9P3 carries a 1000-hour lifetime rating and is appropriate only for short-duty or non-critical applications.

383LX122M250A052 features a 4-lead configuration and increased height (2.047"), requiring PCB layout verification before implementation.

SLP122M250H4P3 operates within a narrower temperature range (-25°C to 105°C) compared to the original specification (-40°C to 105°C), limiting use in applications requiring extended low-temperature operation.

Frequently Asked Questions (FAQ)

Q: Can I use B43508F2128M000 as a direct replacement for ECO-S2EB122EA?

A: Yes. B43508F2128M000 meets all critical electrical parameters (1200 µF, 250 V, ±20% tolerance) and mechanical specifications (10 mm lead spacing, 35 mm case diameter, through-hole snap-in package). The lower ESR (100 mOhm vs. 166 mOhm) and more compact height (1.457" vs. 1.772") represent performance improvements. ROHS3 compliance ensures regulatory alignment.

Q: What is the difference between "Direct Equivalents" and "Similar Parts"?

A: Direct equivalents maintain identical electrical and mechanical specifications to the original part. Similar parts meet core electrical requirements (capacitance, voltage, tolerance) but may vary in secondary characteristics such as case diameter, height, ESR, or lifetime rating. Similar parts require application-specific evaluation before implementation.

Q: Why does 381LQ122M250K452 have a smaller case diameter?

A: 381LQ122M250K452 uses a 1.181" (30 mm) case diameter compared to the standard 1.378" (35 mm). This dimensional difference reflects a different internal construction. The reduced case diameter is accompanied by a 2000-hour lifetime rating versus the 3000-hour rating of standard alternatives, making it suitable only for applications with lower lifetime requirements.

Q: Can I use SLP122M250H4P3 in equipment operating below -25°C?

A: No. SLP122M250H4P3 specifies an operating temperature range of -25°C to 105°C, which does not meet the original specification of -40°C to 105°C. Use this part only in applications where the minimum operating temperature remains above -25°C.

Q: What does ROHS3 compliance mean for component selection?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All active substitute parts listed carry ROHS3 certification, ensuring regulatory compliance for modern manufacturing and end-of-life disposal requirements.

Q: How do I determine if a substitute part fits my PCB layout?

A: Verify three dimensions: lead spacing (all substitutes maintain 0.394" / 10 mm), case diameter (all maintain 1.378" / 35 mm except 381LQ122M250K452 at 1.181"), and seated height. Height variations range from 1.457" to 2.047". Measure your PCB clearance and compare against the substitute part's maximum height specification before implementation.

Q: Why is the original ECO-S2EB122EA obsolete?

A: Panasonic has discontinued the TS-HB series. Active alternatives from Cornell Dubilier Electronics, EPCOS - TDK Electronics, and Nichicon provide equivalent or superior performance with ongoing manufacturing support and ROHS3 compliance.

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