ECE-S2EG681Z 680µF 250V Aluminum Electrolytic Capacitor Equivalent & Substitute Parts

Part Overview

The ECE-S2EG681Z is a 680 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 and substitute parts necessary for ongoing design support and production continuity. The part operates across a temperature range of -40°C to 105°C with a rated lifetime of 2000 hours at 105°C, suitable for general-purpose applications requiring stable capacitance and ripple current handling.

Key Parameters

Parameter	Value
Capacitance	680 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)
Operating Temperature Range	-40°C to 105°C
Lifetime @ 105°C	2000 Hours
Ripple Current @ 120 Hz	1.8 A
Ripple Current @ 50 kHz	2.25 A

Substitute Part Grouping Explanation

Substitution eligibility for the ECE-S2EG681Z is determined by strict compliance with the following electrical and mechanical parameters:

Critical Matching Parameters:

Capacitance: 680 µF (exact match required)
Voltage Rating: 250 V (exact match required)
Tolerance: ±20% (exact match required)
Polarization: Polar (exact match required)
Package Type: Radial, Can - Snap-In (exact match required)
Lead Spacing: 0.394" (10.00 mm) (exact match required)
Case Diameter: 1.378" (35.00 mm) (exact match required)
Operating Temperature Range: -40°C to 105°C (exact match required)
Mounting Type: Through Hole (exact match required)

Allowable Variation Parameters:

Height - Seated (Max): Variation permitted within physical envelope constraints
Lifetime @ 105°C: Variation permitted; substitute parts may exceed original specification
Ripple Current: Variation permitted; substitute parts may exceed original specification
ESR (Equivalent Series Resistance): Variation permitted; substitute parts may differ from original
RoHS Status: Variation permitted; active substitutes may be RoHS3 compliant

All substitute parts listed meet the critical matching parameters. Variations in height, lifetime, ripple current capability, and compliance certifications do not affect functional interchangeability in the original application.

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	Tolerance	Height (Max)	Lifetime @ 105°C	Ripple Current @ 120 Hz	Product Status	RoHS Status
ECE-S2EG681Z	Panasonic	680 µF	250 V	±20%	1.969" (50.00 mm)	2000 Hrs	1.8 A	Obsolete	Non-compliant
381LR681M250A022	Cornell Dubilier Electronics	680 µF	250 V	±20%	1.260" (32.00 mm)	3000 Hrs	2.42 A	Active	ROHS3 Compliant
B43252F2687M	EPCOS - TDK Electronics	680 µF	250 V	±20%	1.457" (37.00 mm)	2000 Hrs	2.09 A	Active	ROHS3 Compliant
B43254G2687M	EPCOS - TDK Electronics	680 µF	250 V	±20%	1.260" (32.00 mm)	3000 Hrs	1.98 A	Active	ROHS3 Compliant
B43255E2687M	EPCOS - TDK Electronics	680 µF	250 V	±20%	1.654" (42.00 mm)	5000 Hrs	2.18 A	Active	ROHS3 Compliant
LGU2E681MELC	Nichicon	680 µF	250 V	±20%	1.181" (30.00 mm)	3000 Hrs	2.0 A	Active	ROHS3 Compliant
LGW2E681MELC25	Nichicon	680 µF	250 V	±20%	0.984" (25.00 mm)	3000 Hrs	2.55 A	Active	ROHS3 Compliant
LP681M250H5P3	Cornell Dubilier Electronics	680 µF	250 V	±20%	1.378" (35.00 mm)	1000 Hrs	2.07 A	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Substitutes (Active Status, Recommended for New Designs):

The following parts are classified as direct substitutes with active product status and full RoHS3 compliance:

381LR681M250A022 (Cornell Dubilier Electronics): Offers extended lifetime (3000 hours) with reduced height (32.00 mm), suitable for space-constrained applications. ESR specification of 219 mOhm @ 120 Hz provides defined performance characteristics.
B43252F2687M (EPCOS - TDK Electronics): Maintains original 2000-hour lifetime specification with moderate height (37.00 mm). Suitable for direct replacement in existing designs with identical lifetime requirements.
B43254G2687M (EPCOS - TDK Electronics): Provides extended lifetime (3000 hours) with compact height (32.00 mm). Ripple current capability (1.98 A @ 120 Hz) closely matches original specification.
B43255E2687M (EPCOS - TDK Electronics): Offers maximum lifetime extension (5000 hours) for applications requiring enhanced reliability. Height of 42.00 mm requires verification against available mounting space.
LGU2E681MELC (Nichicon): Compact design (30.00 mm height) with 3000-hour lifetime. Suitable for space-constrained applications with enhanced reliability requirements.
LGW2E681MELC25 (Nichicon): Most compact option (25.00 mm height) with highest ripple current capability (2.55 A @ 120 Hz). Recommended for applications with severe space limitations and high ripple current demands.

Similar Substitute (Active Status, Conditional Use):

LP681M250H5P3 (Cornell Dubilier Electronics): Maintains original case diameter and height matching. However, reduced lifetime specification (1000 hours) limits suitability to applications not requiring extended operational life. Use only when space constraints and cost considerations override lifetime requirements.

All substitute parts maintain identical electrical specifications (680 µF, 250 V, ±20% tolerance) and mechanical compatibility (10.00 mm lead spacing, 35.00 mm case diameter, through-hole mounting). Selection should prioritize active product status and RoHS3 compliance for new designs.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with different height than the original ECE-S2EG681Z?

A: Yes. Height variation is permitted provided the substitute part fits within the available mounting space on the PCB. All listed substitutes maintain the critical 10.00 mm lead spacing and 35.00 mm case diameter, ensuring mechanical compatibility. Verify clearance in your specific application before selection.

Q: What does "lifetime" mean, and why do some substitutes have longer lifetimes?

A: Lifetime specification indicates the number of hours a capacitor maintains its electrical characteristics at maximum rated temperature (105°C) before capacitance degradation exceeds tolerance limits. Substitute parts with extended lifetimes (3000 or 5000 hours versus the original 2000 hours) provide enhanced reliability and longer operational life in the same application. This is an allowable improvement and does not affect interchangeability.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance certification. The original ECE-S2EG681Z is RoHS non-compliant. If your application requires RoHS compliance, any of the listed substitutes meets this requirement.

Q: Does ripple current variation affect part selection?

A: Ripple current specification indicates the maximum AC current the capacitor can handle at specified frequency without exceeding temperature limits. Substitute parts with equal or higher ripple current ratings are fully compatible. Higher ripple current capability provides design margin and is not a limiting factor for substitution.

Q: Why is the ECE-S2EG681Z obsolete, and which substitute should I choose?

A: The ECE-S2EG681Z is obsolete and no longer manufactured by Panasonic. For new designs, select from active substitutes based on your specific requirements: choose LGW2E681MELC25 for maximum space savings, B43255E2687M for maximum lifetime, or 381LR681M250A022 for balanced performance and compact size. All maintain full electrical and mechanical compatibility.

Q: Can I mix different substitute parts in the same application?

A: Yes. All listed substitute parts meet identical electrical specifications and mechanical compatibility requirements. Mixing different manufacturers or part numbers in the same circuit is permissible from an engineering standpoint, though procurement and inventory management may favor standardization on a single substitute part.

Q: What is ESR, and why do some parts specify it while others do not?

A: ESR (Equivalent Series Resistance) represents internal resistance affecting capacitor performance at specific frequencies. Parts with specified ESR values (such as 381LR681M250A022 at 219 mOhm @ 120 Hz) provide defined performance characteristics. Parts without specified ESR values are still fully compatible; ESR specification is supplementary information and not a substitution criterion.

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