LGU2C681MELZ Equivalent & Substitute Parts

Part Overview

The LGU2C681MELZ is a 680 µF, 160 V aluminum electrolytic capacitor in radial, can snap-in package manufactured by Nichicon. This component is rated for 3000 hours at 105°C and is designed for general-purpose applications requiring stable capacitance and ripple current handling. The part is Active status and ROHS3 compliant. Equivalent and substitute parts are identified based on matching or exceeding electrical specifications while maintaining mechanical compatibility with the through-hole snap-in mounting interface.

Key Parameters

Parameter	Value
Capacitance	680 µF
Voltage Rating	160 V
Tolerance	±20%
Lifetime @ Temperature	3000 Hrs @ 105°C
Operating Temperature Range	-40°C ~ 105°C
Ripple Current @ 120 Hz	1.82 A
Ripple Current @ 50 kHz	2.73 A
Lead Spacing	0.394" (10.00 mm)
Case Diameter	0.866" (22.00 mm)
Height	1.575" (40.00 mm)
Mounting Type	Through Hole
Package Type	Radial, Can - Snap-In
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the LGU2C681MELZ is determined by the following criteria:

Direct Equivalents maintain identical electrical specifications: 680 µF capacitance, 160 V voltage rating, ±20% tolerance, 3000 hours lifetime at 105°C, and through-hole snap-in mounting. These parts differ only in case diameter and height dimensions, which do not affect electrical function but may impact board layout compatibility.

Upgraded Voltage Ratings provide higher voltage tolerance (180 V or 200 V) while maintaining 680 µF capacitance, ±20% tolerance, and 3000-hour lifetime. These parts are electrically compatible in applications where the original 160 V rating is sufficient, as they operate within the same temperature and ripple current envelope.

Similar Lifetime Parts maintain 680 µF capacitance and 160 V rating but specify 2000 hours at 105°C instead of 3000 hours. These are suitable for applications with less stringent lifetime requirements.

Mechanical Compatibility is ensured through matching lead spacing (0.394" / 10.00 mm) and radial snap-in package configuration across all substitute parts.

Parameter Comparison

Part Number	Series	Capacitance	Voltage	Tolerance	Lifetime @ 105°C	Case Dia (mm)	Height (mm)	Ripple @ 120 Hz	Ripple @ 50 kHz	Status
LGU2C681MELZ	LGU	680 µF	160 V	±20%	3000 Hrs	22.00	40.00	1.82 A	2.73 A	Active
LGN2C681MELZ35	LGN	680 µF	160 V	±20%	3000 Hrs	22.00	37.00	1.7 A	2.55 A	Active
LGN2Z681MELZ35	LGN	680 µF	180 V	±20%	3000 Hrs	22.00	37.00	1.7 A	2.55 A	Active
LGW2D681MELZ40	LGW	680 µF	200 V	±20%	3000 Hrs	22.00	40.00	2.3 A	3.45 A	Active
LGG2C681MELZ30	LGG	680 µF	160 V	±20%	2000 Hrs	22.00	32.00	1.5 A	2.25 A	Active
LGN2C681MELA25	LGN	680 µF	160 V	±20%	3000 Hrs	25.00	27.00	1.7 A	2.55 A	Active
LGU2C681MELB	LGU	680 µF	160 V	±20%	3000 Hrs	30.00	25.00	1.82 A	2.73 A	Active
LGU2Z681MELZ	LGU	680 µF	180 V	±20%	3000 Hrs	22.00	45.00	1.78 A	2.67 A	Active

Engineering Selection Recommendations

All listed substitute parts are Active status and ROHS3 compliant, meeting the same regulatory requirements as the LGU2C681MELZ.

For direct replacement with identical electrical performance: Select LGN2C681MELZ35 or LGU2C681MELB. Both maintain 680 µF, 160 V, 3000-hour lifetime specifications. LGN2C681MELZ35 offers a more compact height (37.00 mm vs. 40.00 mm), while LGU2C681MELB provides increased case diameter (30.00 mm) for applications requiring different board layout constraints.

For applications requiring higher voltage margin: LGN2Z681MELZ35 (180 V) or LGW2D681MELZ40 (200 V) provide upgraded voltage ratings while maintaining 680 µF capacitance and 3000-hour lifetime. LGW2D681MELZ40 additionally offers increased ripple current capacity (2.3 A @ 120 Hz, 3.45 A @ 50 kHz).

For space-constrained designs: LGG2C681MELZ30 provides the most compact height (32.00 mm) with matching 680 µF, 160 V specifications, though with reduced lifetime rating (2000 hours vs. 3000 hours). LGN2C681MELA25 offers a different form factor (25.00 mm diameter, 27.00 mm height) suitable for alternative board layouts.

Frequently Asked Questions (FAQ)

Q: Can LGN2C681MELZ35 replace LGU2C681MELZ directly?

A: Yes. Both parts share identical electrical specifications: 680 µF, 160 V, ±20% tolerance, and 3000-hour lifetime at 105°C. The primary difference is case height (37.00 mm vs. 40.00 mm), which does not affect electrical function. Verify board layout clearance before substitution.

Q: What is the difference between LGW2D681MELZ40 and LGU2C681MELZ?

A: LGW2D681MELZ40 provides a higher voltage rating (200 V vs. 160 V) and increased ripple current capacity (2.3 A @ 120 Hz vs. 1.82 A). Both maintain 680 µF capacitance and 3000-hour lifetime. The higher voltage rating provides additional safety margin in applications where the original 160 V specification is adequate.

Q: Is LGG2C681MELZ30 suitable as a substitute?

A: LGG2C681MELZ30 maintains 680 µF, 160 V, and ±20% tolerance specifications with through-hole snap-in mounting. The key difference is reduced lifetime rating (2000 hours vs. 3000 hours at 105°C). This part is suitable for applications with less stringent reliability requirements or shorter service life expectations.

Q: Do all substitute parts use the same lead spacing?

A: Yes. All listed parts maintain 0.394" (10.00 mm) lead spacing, ensuring compatibility with existing PCB footprints designed for the LGU2C681MELZ.

Q: Can LGU2C681MELB be used in place of LGU2C681MELZ?

A: Yes. Both parts are from the LGU series with identical electrical specifications (680 µF, 160 V, 3000-hour lifetime). The difference is case diameter (30.00 mm vs. 22.00 mm) and height (25.00 mm vs. 40.00 mm). Verify that the larger case diameter does not conflict with board layout or component spacing requirements.

Q: What does the series designation (LGU, LGN, LGW, LGG) indicate?

A: The series designation identifies the product line within Nichicon's aluminum electrolytic capacitor portfolio. Each series may have different case dimensions, ripple current ratings, or lifetime specifications while maintaining the same capacitance and voltage values. Consult the parameter comparison table to verify compatibility for your specific application.

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