EET-HC2C681HA Equivalent & Substitute Parts

Part Overview

The Panasonic EET-HC2C681HA is a 680 µF, 160 V aluminum electrolytic capacitor in radial, can snap-in package with through-hole mounting. 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 low equivalent series resistance.

Key Parameters

Parameter	Value
Capacitance	680 µF
Voltage Rating	160 V
Tolerance	±20%
ESR @ 120 Hz	293 mOhm
Lifetime @ 105°C	2000 Hrs
Operating Temperature Range	-40°C to 105°C
Lead Spacing	0.394" (10.00 mm)
Diameter	0.866" (22.00 mm)
Height (Seated Max)	1.260" (32.00 mm)
Mounting Type	Through Hole
Package Type	Radial, Can - Snap-In
Polarization	Polar

Substitute Part Grouping Explanation

Substitution of the EET-HC2C681HA is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters (Must Match):

Capacitance: 680 µF
Voltage Rating: 160 V
Tolerance: ±20%
Polarization: Polar
Mounting Type: Through Hole
Package Type: Radial, Can - Snap-In
Lead Spacing: 0.394" (10.00 mm)

Compatible Variation Parameters:

Operating Temperature Range: -40°C to 105°C (or narrower range acceptable)
Lifetime @ 105°C: 2000 Hrs or greater
ESR @ 120 Hz: 293 mOhm (or lower acceptable)
Physical Dimensions: Height and diameter within mechanical envelope constraints

Substitute parts are grouped into three categories based on their relationship to the original specification:

Upgrade Substitutes: Parts with improved performance characteristics (extended lifetime, lower ESR, or enhanced ripple current handling) while maintaining full mechanical and electrical compatibility.

Similar Substitutes: Parts meeting all critical electrical parameters with minor dimensional variations that remain compatible within typical PCB layout tolerances.

Parametric Equivalents: Parts matching all critical parameters with identical or superior performance specifications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Capacitance	Voltage	Tolerance	ESR @ 120 Hz	Lifetime @ 105°C	Operating Temp Range	Lead Spacing	Diameter	Height (Max)	Product Status	RoHS Status
EET-HC2C681HA	Panasonic	680 µF	160 V	±20%	293 mOhm	2000 Hrs	-40°C to 105°C	0.394" (10.00 mm)	0.866" (22.00 mm)	1.260" (32.00 mm)	Obsolete	REACH Affected
160MXG680MEFCSN22X30	Rubycon	680 µF	160 V	±20%	—	3000 Hrs	-25°C to 105°C	0.394" (10.00 mm)	0.866" (22.00 mm)	1.256" (31.90 mm)	Active	ROHS3 Compliant
381LQ681M160J012	Cornell Dubilier Electronics (CDE)	680 µF	160 V	±20%	293 mOhm	2000 Hrs	-40°C to 105°C	0.394" (10.00 mm)	0.984" (25.00 mm)	1.063" (27.00 mm)	Active	ROHS3 Compliant
381LX681M160H042	Cornell Dubilier Electronics (CDE)	680 µF	160 V	±20%	—	3000 Hrs	-40°C to 105°C	0.394" (10.00 mm)	0.866" (22.00 mm)	1.654" (42.00 mm)	Active	ROHS3 Compliant
381LX681M160J022	Cornell Dubilier Electronics (CDE)	680 µF	160 V	±20%	—	3000 Hrs	-40°C to 105°C	0.394" (10.00 mm)	0.984" (25.00 mm)	1.260" (32.00 mm)	Active	ROHS3 Compliant
EKMQ161VSN681MP30S	Chemi-Con	680 µF	160 V	±20%	—	2000 Hrs	-25°C to 105°C	0.394" (10.00 mm)	0.866" (22.00 mm)	1.260" (32.00 mm)	Active	ROHS3 Compliant
381LQ681M160H022	Cornell Dubilier Electronics (CDE)	680 µF	160 V	±20%	293 mOhm	2000 Hrs	-40°C to 105°C	0.394" (10.00 mm)	0.866" (22.00 mm)	1.260" (32.00 mm)	Active	ROHS3 Compliant
LGG2C681MELZ30	Nichicon	680 µF	160 V	±20%	—	2000 Hrs	-40°C to 105°C	0.394" (10.00 mm)	0.866" (22.00 mm)	1.260" (32.00 mm)	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement with Extended Reliability: The 160MXG680MEFCSN22X30 (Rubycon MXG series) provides an upgrade path with 3000-hour lifetime at 105°C versus the original 2000 hours, while maintaining identical lead spacing and diameter. Physical height is negligibly reduced (31.90 mm vs. 32.00 mm), making it suitable for existing PCB layouts. This part is ROHS3 compliant and carries active product status.

For Parametric Equivalence with Identical Specifications: The 381LQ681M160H022 (Cornell Dubilier 381LQ series) matches the original part's ESR specification (293 mOhm @ 120 Hz), lifetime (2000 Hrs @ 105°C), and operating temperature range (-40°C to 105°C). Physical dimensions are identical to the original. This part is ROHS3 compliant and active.

For Extended Lifetime Applications: The 381LX681M160H042 and 381LX681M160J022 (Cornell Dubilier 381LX series) both offer 3000-hour lifetime at 105°C. The 381LX681M160H042 maintains the original diameter (22.00 mm) but has increased height (42.00 mm), requiring PCB layout verification. The 381LX681M160J022 has larger diameter (25.00 mm) but standard height (32.00 mm).

For General-Purpose Substitution: The LGG2C681MELZ30 (Nichicon LGG series) and EKMQ161VSN681MP30S (Chemi-Con KMQ series) both provide active product status with full electrical compatibility. The Nichicon part maintains identical dimensions and operating temperature range. The Chemi-Con part has a narrower operating temperature range (-25°C to 105°C) and should be selected only when the lower temperature limit is acceptable for the application.

All substitute parts maintain the critical parameters: 680 µF capacitance, 160 V voltage rating, ±20% tolerance, polar configuration, through-hole mounting, and snap-in package type.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with different physical dimensions? A: Physical dimensions must be verified against PCB layout constraints. Lead spacing (10.00 mm) is fixed across all substitutes. Diameter and height variations require confirmation that the component fits within the allocated mechanical envelope. The 381LX681M160H042 with 42.00 mm height and 381LQ681M160J012 with 25.00 mm diameter represent maximum variations and require explicit layout review.

Q: What is the difference between ESR specifications listed and those marked as "—"? A: ESR values are provided only when explicitly specified by the manufacturer. Parts with "—" indicate ESR data was not provided in the component specification. The original EET-HC2C681HA specifies 293 mOhm @ 120 Hz; equivalent parts with identical ESR are 381LQ681M160J012, 381LQ681M160H022, and EKMQ161VSN681MP30S. Parts without specified ESR may have different impedance characteristics and should be evaluated for ripple current performance in the target application.

Q: Are all substitute parts RoHS compliant? A: All active substitute parts listed are ROHS3 compliant. The original EET-HC2C681HA is marked as REACH Affected; all substitutes are REACH Unaffected or ROHS3 Compliant, providing improved regulatory compliance for new designs.

Q: What is the significance of lifetime ratings (2000 Hrs vs. 3000 Hrs @ 105°C)? A: Lifetime rating indicates the expected operational duration at maximum rated temperature (105°C) before capacitance degradation exceeds tolerance limits. The original part specifies 2000 hours; upgrade substitutes with 3000-hour ratings provide extended service life under thermal stress. Selection depends on application duty cycle and expected operating temperature profile.

Q: Can I substitute the EET-HC2C681HA with a part having a narrower operating temperature range? A: The original part operates from -40°C to 105°C. Substitutes with narrower ranges (e.g., EKMQ161VSN681MP30S at -25°C to 105°C) are acceptable only if the application does not require operation below -25°C. Verify the minimum operating temperature requirement before selecting a part with reduced low-temperature capability.

Q: Which substitute offers the best direct replacement? A: The 381LQ681M160H022 (Cornell Dubilier) provides the most direct replacement, matching all critical electrical parameters (680 µF, 160 V, ±20%, 293 mOhm ESR, 2000 Hrs @ 105°C) and physical dimensions (0.866" diameter, 1.260" height) of the original EET-HC2C681HA. It is ROHS3 compliant and carries active product status.

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