ECO-S2GP681EX Equivalent & Substitute Parts

Part Overview

The ECO-S2GP681EX is a 680 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 and substitute parts necessary for ongoing design support and production continuity. The part operates across a temperature range of -25°C to 85°C with a rated lifetime of 3000 hours at 85°C, serving general-purpose applications requiring stable capacitance and low equivalent series resistance.

Key Parameters

Parameter	Value
Capacitance	680 µF
Tolerance	±20%
Voltage Rating	400 V
ESR @ 120 Hz	268 mOhm
Lifetime @ 85°C	3000 Hours
Operating Temperature Range	-25°C to 85°C
Lead Spacing	0.394" (10.00 mm)
Case Diameter	1.378" (35.00 mm)
Mounting Type	Through Hole
Package Type	Radial, Can - Snap-In
Polarization	Polar

Substitute Part Grouping Explanation

Substitution eligibility for the ECO-S2GP681EX is determined by strict adherence to the following parameters:

Critical Parameters (Must Match Exactly):

Capacitance: 680 µF
Voltage Rating: 400 V
Tolerance: ±20%
Lead Spacing: 0.394" (10.00 mm)
Package Type: Radial, Can - Snap-In
Mounting Type: Through Hole
Polarization: Polar

Performance Parameters (Must Meet or Exceed):

Lifetime @ 85°C: Minimum 3000 hours
Operating Temperature Range: Minimum -25°C to 85°C
ESR @ 120 Hz: 268 mOhm or lower preferred

Compatibility Parameters:

Case Diameter: 1.378" (35.00 mm) preferred; minor variations acceptable within mechanical envelope constraints
Height: Seated height must not exceed 2.047" (52.00 mm) for standard PCB clearance

Substitute parts are categorized as Direct Equivalents, Upgrades, or Similar Parts based on how closely they match these parameters and their product status.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Capacitance	Voltage	ESR @ 120 Hz	Lifetime @ 85°C	Case Dia.	Height (Max)	Product Status
ECO-S2GP681EX	Panasonic	680 µF	400 V	268 mOhm	3000 Hrs	1.378"	1.969"	Obsolete
380LQ681M400A452	Cornell Dubilier	680 µF	400 V	293 mOhm	2000 Hrs	1.378"	1.850"	Active
380LX681M400A052	Cornell Dubilier	680 µF	400 V	270 mOhm	3000 Hrs	1.378"	2.047"	Active
400USG680MEFCSN35X40	Rubycon	680 µF	400 V	—	3000 Hrs	1.378"	1.654"	Active
B43501A9687M000	EPCOS - TDK	680 µF	400 V	100 mOhm	10000 Hrs	1.378"	2.244"	Not For New Designs
LGW2G681MELC50	Nichicon	680 µF	400 V	—	3000 Hrs @ 105°C	1.378"	1.969"	Active
380LQ681M400K052	Cornell Dubilier	680 µF	400 V	293 mOhm	2000 Hrs	1.181"	2.047"	Active
ESMQ401VSN681MA40S	Chemi-Con	680 µF	400 V	—	2000 Hrs	1.378"	1.575"	Active
ESMQ401VSN681MR50S	Chemi-Con	680 µF	400 V	—	2000 Hrs	1.181"	1.969"	Active
ESMM401VNN681MA50U	Chemi-Con	680 µF	400 V	—	3000 Hrs	1.378"	1.969"	Active
LLS2G681MELC	Nichicon	680 µF	400 V	—	3000 Hrs	1.378"	1.969"	Active

Engineering Selection Recommendations

Direct Equivalents (Recommended for Drop-In Replacement):

380LX681M400A052 (Cornell Dubilier) and ESMM401VNN681MA50U (Chemi-Con) provide the closest functional equivalence to the ECO-S2GP681EX. Both maintain 680 µF capacitance, 400 V rating, 3000-hour lifetime at 85°C, and identical lead spacing and case diameter. Both are active products with ROHS3 compliance, ensuring long-term availability and regulatory alignment. The 380LX681M400A052 offers ESR of 270 mOhm, marginally higher than the original 268 mOhm but within acceptable tolerance for general-purpose applications.

Performance Upgrade Option:

LGW2G681MELC50 (Nichicon) extends the operating temperature range to 105°C and maintains 3000-hour lifetime at this elevated temperature, providing enhanced thermal performance for applications requiring higher temperature stability. This part is active and ROHS3 compliant.

Alternative with Extended Lifetime:

B43501A9687M000 (EPCOS - TDK) delivers superior ESR performance at 100 mOhm and extended 10000-hour lifetime at 85°C. However, this part is classified as "Not For New Designs," limiting its suitability for new production. Use only for legacy system maintenance where existing inventory exists.

Space-Constrained Applications:

400USG680MEFCSN35X40 (Rubycon) offers the lowest seated height at 1.654", accommodating PCB designs with limited vertical clearance while maintaining 3000-hour lifetime and active product status.

Reduced Lifetime Alternatives:

380LQ681M400A452 (Cornell Dubilier) and ESMQ401VSN681MA40S (Chemi-Con) provide 2000-hour lifetime at 85°C, suitable only for applications where reduced operational life is acceptable. Both are active products with standard compliance.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a different case diameter?

A: Case diameter variations exist among the listed substitutes (1.181" vs. 1.378"). Verify PCB footprint and mechanical envelope constraints before selection. Smaller diameter parts may require PCB layout modification. Lead spacing must remain 0.394" (10.00 mm) for direct compatibility.

Q: What is the impact of ESR differences between the main part and substitutes?

A: ESR affects ripple current handling and heat dissipation. The ECO-S2GP681EX specifies 268 mOhm @ 120 Hz. Substitutes with higher ESR (such as 293 mOhm) generate slightly more heat under ripple current stress. The B43501A9687M000 with 100 mOhm ESR provides superior performance but is not recommended for new designs. For general-purpose applications, ESR variations within ±30% are typically acceptable.

Q: Why do some substitutes have different lifetime ratings?

A: Lifetime at rated temperature reflects capacitor construction and electrolyte chemistry. The ECO-S2GP681EX and preferred substitutes specify 3000 hours at 85°C. Parts with 2000-hour ratings use different electrolyte formulations and are suitable only for applications with lower reliability requirements. The LGW2G681MELC50 specifies 3000 hours at 105°C, indicating superior thermal stability.

Q: Are all substitute parts RoHS compliant?

A: Most active substitutes are ROHS3 compliant. Verify compliance documentation for specific applications requiring regulatory certification. The B43501A9687M000 is ROHS3 compliant but carries "Not For New Designs" status.

Q: What is the difference between "Active" and "Obsolete" product status?

A: Active parts have guaranteed long-term availability and manufacturer support. Obsolete parts (ECO-S2GP681EX) have been discontinued and may have limited remaining inventory. Select active substitutes for new designs and production continuity.

Q: Can I substitute based on capacitance and voltage alone?

A: No. Substitution requires matching all critical parameters: capacitance (680 µF), voltage (400 V), tolerance (±20%), lead spacing (0.394"), case diameter (1.378" preferred), and package type (Radial, Can - Snap-In). Performance parameters such as lifetime and ESR must meet or exceed original specifications for equivalent functionality.

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