ECO-S2EP122EX Equivalent & Substitute Parts

Part Overview

The ECO-S2EP122EX is a 1200 µF, 250 V aluminum electrolytic capacitor in radial, can snap-in package manufactured by Panasonic Electronic Components. This part operates across -40°C to 85°C with a rated lifetime of 3000 hours at 85°C and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for ongoing system support and new designs requiring comparable electrical and mechanical characteristics.

Key Parameters

Parameter	Value
Capacitance	1200 µF
Voltage Rating	250 V
Tolerance	±20%
ESR @ 120Hz	166 mOhm
Lifetime @ 85°C	3000 Hrs
Operating Temperature Range	-40°C ~ 85°C
Lead Spacing	0.394" (10.00 mm)
Case Diameter	1.378" (35.00 mm)
Package Type	Radial, Can - Snap-In
Mounting Type	Through Hole
Polarization	Polar

Substitute Part Grouping Explanation

Substitution of the ECO-S2EP122EX is determined by strict equivalence across the following critical parameters:

Capacitance: 1200 µF (exact match required)
Voltage Rating: 250 V (exact match required)
Tolerance: ±20% (exact match required)
Lead Spacing: 0.394" (10.00 mm) (exact match required)
Case Diameter: 1.378" (35.00 mm) (exact match required)
Package Type: Radial, Can - Snap-In (exact match required)
Mounting Type: Through Hole (exact match required)
Operating Temperature Range: -40°C ~ 85°C (minimum requirement)
Lifetime @ 85°C: 3000 Hrs (minimum requirement)

Parts are grouped into the following categories based on substitution relationship:

Direct Substitutes: Parts meeting all critical electrical and mechanical parameters with active product status.

Upgrade Options: Parts exceeding minimum lifetime or temperature specifications while maintaining all critical parameters.

Similar Parts: Parts with minor dimensional variations (height) or reduced lifetime specifications that may require application review.

Parametric Equivalents: Parts with identical electrical characteristics and core dimensions but alternative height configurations.

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	Tolerance	ESR @ 120Hz	Lifetime @ 85°C	Height (Max)	Case Dia	Status
ECO-S2EP122EX	Panasonic	1200 µF	250 V	±20%	166 mOhm	3000 Hrs	1.575" (40.00 mm)	1.378" (35.00 mm)	Obsolete
250USG1200MEFC35X35	Rubycon	1200 µF	250 V	±20%	—	3000 Hrs	1.457" (37.00 mm)	1.378" (35.00 mm)	Active
380LX122M250A042	Cornell Dubilier Electronics	1200 µF	250 V	±20%	166 mOhm	3000 Hrs	1.654" (42.00 mm)	1.378" (35.00 mm)	Active
380LQ122M250A032	Cornell Dubilier Electronics	1200 µF	250 V	±20%	166 mOhm	2000 Hrs	1.457" (37.00 mm)	1.378" (35.00 mm)	Active
B43501B2128M000	EPCOS - TDK Electronics	1200 µF	250 V	±20%	85 mOhm @ 100Hz	10000 Hrs	1.654" (42.00 mm)	1.378" (35.00 mm)	Active
LLS2E122MELC	Nichicon	1200 µF	250 V	±20%	—	3000 Hrs	1.378" (35.00 mm)	1.378" (35.00 mm)	Active
LGW2E122MELC40	Nichicon	1200 µF	250 V	±20%	—	3000 Hrs @ 105°C	1.575" (40.00 mm)	1.378" (35.00 mm)	Active
380LQ122M250K042	Cornell Dubilier Electronics	1200 µF	250 V	±20%	166 mOhm @ 120Hz	2000 Hrs	1.654" (42.00 mm)	1.181" (30.00 mm)	Active
LPX122M250H4P3	Cornell Dubilier Electronics	1200 µF	250 V	±20%	166 mOhm @ 120Hz	1000 Hrs	1.772" (45.00 mm)	1.378" (35.00 mm)	Active
SLPX122M250E9P3	Cornell Dubilier Electronics	1200 µF	250 V	±20%	166 mOhm @ 120Hz	3000 Hrs	1.969" (50.00 mm)	1.181" (30.00 mm)	Active
SLPX122M250H7P3	Cornell Dubilier Electronics	1200 µF	250 V	±20%	166 mOhm @ 120Hz	3000 Hrs	1.575" (40.00 mm)	1.378" (35.00 mm)	Active

Engineering Selection Recommendations

Direct Substitutes (Preferred for Pin-Compatible Replacement):

250USG1200MEFC35X35 (Rubycon) and LLS2E122MELC (Nichicon) are direct substitutes with active product status. Both maintain the 1200 µF, 250 V specification with ±20% tolerance and 3000-hour lifetime at 85°C. The 250USG1200MEFC35X35 has a reduced height of 1.457" compared to the original 1.575", while LLS2E122MELC matches the original case diameter exactly at 1.378" with a height of 1.378". Both are ROHS3 compliant.

Enhanced Lifetime Option:

B43501B2128M000 (EPCOS - TDK Electronics) provides superior performance with 10000-hour lifetime at 85°C and lower ESR of 85 mOhm at 100Hz. This part is ROHS3 compliant and suitable for applications requiring extended operational life. Height is 1.654", requiring PCB layout verification.

Temperature-Enhanced Upgrade:

LGW2E122MELC40 (Nichicon) extends the operating temperature range to -40°C ~ 105°C with 3000-hour lifetime at 105°C. This upgrade maintains all critical electrical parameters and is ROHS3 compliant, suitable for high-temperature environments.

Dimensional Constraints:

Parts with case diameter of 1.181" (380LQ122M250K042, SLPX122M250E9P3) deviate from the original 1.378" specification and require PCB footprint modification. These are not recommended for direct replacement without layout redesign.

LPX122M250H4P3 has reduced lifetime of 1000 hours at 85°C, below the original 3000-hour specification, and is not recommended for equivalent replacement.

380LQ122M250A032 has reduced lifetime of 2000 hours at 85°C, below the original specification.

Frequently Asked Questions (FAQ)

Q: Can I use 250USG1200MEFC35X35 as a direct replacement for ECO-S2EP122EX?

A: Yes. Both parts share identical electrical specifications (1200 µF, 250 V, ±20% tolerance) and lead spacing (0.394"). The 250USG1200MEFC35X35 has a slightly reduced height of 1.457" versus 1.575", which may fit in tighter PCB layouts. Verify clearance in your specific application.

Q: What is the difference between LLS2E122MELC and 250USG1200MEFC35X35?

A: Both are direct electrical equivalents with 1200 µF, 250 V, ±20% tolerance, and 3000-hour lifetime at 85°C. LLS2E122MELC has a height of 1.378" (matching the case diameter), while 250USG1200MEFC35X35 is 1.457" tall. The choice depends on available PCB height clearance.

Q: Why is B43501B2128M000 listed as an option if it has a different ESR?

A: B43501B2128M000 meets all critical substitution parameters (capacitance, voltage, tolerance, lead spacing, case diameter, package type) and provides superior performance with 10000-hour lifetime at 85°C and lower ESR of 85 mOhm. The lower ESR may benefit ripple current handling in power supply applications. It is suitable where enhanced reliability is required.

Q: Can I use parts with different case diameters like 380LQ122M250K042?

A: No. The 380LQ122M250K042 has a case diameter of 1.181" versus the required 1.378", which does not meet the mechanical substitution criteria. This part requires PCB footprint redesign and is not a direct replacement.

Q: What does "Lifetime @ 85°C" mean for capacitor selection?

A: This specifies the expected operational life of the capacitor under rated voltage and ripple current at 85°C ambient temperature. The ECO-S2EP122EX has 3000 hours at 85°C. Substitutes meeting or exceeding this specification maintain equivalent reliability. Parts with reduced lifetime (such as LPX122M250H4P3 at 1000 hours) do not meet the original performance requirement.

Q: Is LGW2E122MELC40 compatible with my existing design?

A: LGW2E122MELC40 is electrically and mechanically compatible with the ECO-S2EP122EX. It offers an upgrade with extended operating temperature to 105°C and maintains 3000-hour lifetime at the higher temperature. Height is 1.575", matching the original. Verify your application does not require the lower temperature limit of -40°C to 85°C exclusively.

Q: What does ROHS3 compliance mean?

A: ROHS3 compliance indicates the part meets the Restriction of Hazardous Substances Directive, restricting specific hazardous materials in electrical and electronic equipment. All recommended active substitutes are ROHS3 compliant, ensuring regulatory alignment with modern manufacturing standards.

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