EEU-FC1C681LB Equivalent & Substitute Parts

Part Overview

The EEU-FC1C681LB is a 680 µF, 16 V aluminum electrolytic capacitor manufactured by Panasonic Electronic Components in the FC series. This radial, through-hole component is rated for 2000 hours at 105°C and meets AEC-Q200 automotive specifications. The part is currently active and available in Tape & Box packaging with 676 pieces in stock.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative packaging formats are required, or when design requirements allow for components with different thermal ratings or mechanical dimensions while maintaining electrical compatibility.

Key Parameters

Parameter	Value
Capacitance	680 µF
Voltage Rating	16 V
Tolerance	±20%
Lifetime @ Temperature	2000 Hrs @ 105°C
Operating Temperature Range	-55°C ~ 105°C
Polarization	Polar
Mounting Type	Through Hole
Package Type	Radial, Can
Lead Spacing	0.197" (5.00mm)
Diameter	0.315" (8.00mm)
Height	1.024" (26.00mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the EEU-FC1C681LB is determined by the following core parameters:

Mandatory Matching Parameters:

Capacitance: 680 µF
Voltage Rating: 16 V
Tolerance: ±20%
Polarization: Polar
Mounting Type: Through Hole
Package Type: Radial, Can

Flexible Parameters (Allow Variation):

Lifetime @ Temperature: May exceed 2000 Hrs @ 105°C
Lead Spacing: 0.138" (4.60mm) or 0.197" (5.00mm) acceptable with PCB layout verification
Diameter: 0.315" (8.00mm) or 0.394" (10.00mm) acceptable with space constraints verification
Height: May vary within mechanical envelope constraints
Impedance: Variation acceptable within ripple current performance requirements
Ripple Current: Must meet or exceed application requirements

Substitute parts are grouped by mechanical compatibility and thermal performance characteristics. Parts with identical lead spacing and diameter are direct mechanical substitutes. Parts with different dimensions require PCB layout verification.

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	Tolerance	Lifetime @ 105°C	Lead Spacing	Diameter	Height	Impedance	Product Status	Packaging
EEU-FC1C681LB	Panasonic	680 µF	16 V	±20%	2000 Hrs	0.197" (5.00mm)	0.315" (8.00mm)	1.024" (26.00mm)	65 mOhms	Active	Tape & Box
EEU-FC1C681L	Panasonic	680 µF	16 V	±20%	2000 Hrs	0.138" (4.60mm)	0.315" (8.00mm)	0.787" (20.00mm)	65 mOhms	Active	Bulk
ELXZ160ELL681MJ16S	Chemi-Con	680 µF	16 V	±20%	5000 Hrs	0.197" (5.00mm)	0.394" (10.00mm)	0.689" (17.50mm)	68 mOhms	Active	Bulk
UPJ1C681MPD	Nichicon	680 µF	16 V	±20%	5000 Hrs	0.197" (5.00mm)	0.394" (10.00mm)	0.846" (21.50mm)	100 mOhms	Not For New Designs	Bulk
UPM1C681MPD	Nichicon	680 µF	16 V	±20%	5000 Hrs	0.197" (5.00mm)	0.394" (10.00mm)	0.866" (22.00mm)	65 mOhms	Not For New Designs	Bulk
UPS1C681MPD	Nichicon	680 µF	16 V	±20%	2000 Hrs	0.197" (5.00mm)	0.394" (10.00mm)	0.689" (17.50mm)	140 mOhms	Not For New Designs	Bulk
UPW1C681MPD	Nichicon	680 µF	16 V	±20%	5000 Hrs	0.197" (5.00mm)	0.394" (10.00mm)	0.630" (16.00mm)	68 mOhms	Not For New Designs	Bulk
UPW1C681MPD6	Nichicon	680 µF	16 V	±20%	3000 Hrs	0.138" (4.60mm)	0.315" (8.00mm)	0.787" (20.00mm)	65 mOhms	Not For New Designs	Bulk

Engineering Selection Recommendations

For Active Product Status Designs:

EEU-FC1C681L (Panasonic FC series) is the primary substitute when Tape & Box packaging is not required. This part maintains identical electrical specifications and mechanical diameter while offering reduced height (0.787" vs 1.024") and different lead spacing (0.138" vs 0.197"). Lead spacing difference requires PCB layout verification before substitution.

ELXZ160ELL681MJ16S (Chemi-Con LXZ series) is suitable for applications requiring extended thermal life (5000 Hrs @ 105°C vs 2000 Hrs). This part maintains identical lead spacing and voltage rating but has increased diameter (0.394" vs 0.315") and reduced height (0.689" vs 1.024"). Mechanical envelope verification is required.

For Legacy or Discontinued Design Support:

UPW1C681MPD6 (Nichicon UPW series) provides mechanical compatibility with EEU-FC1C681L in terms of diameter and height while offering extended thermal life (3000 Hrs @ 105°C). Lead spacing is 0.138" (4.60mm), requiring PCB layout verification.

UPM1C681MPD (Nichicon UPM series) is marked "Not For New Designs" but remains available with AEC-Q200 automotive rating, 5000 Hrs @ 105°C thermal life, and identical lead spacing to the main part (0.197"). Impedance matches the main part at 65 mOhms.

UPW1C681MPD (Nichicon UPW series) is marked "Not For New Designs" and offers 5000 Hrs @ 105°C thermal life with identical lead spacing (0.197") but increased diameter (0.394" vs 0.315").

UPS1C681MPD (Nichicon UPS series) is marked "Not For New Designs" and matches the main part's 2000 Hrs @ 105°C thermal life with identical lead spacing (0.197") but has higher impedance (140 mOhms vs 65 mOhms) and increased diameter (0.394" vs 0.315").

UPJ1C681MPD (Nichicon UPJ series) is marked "Not For New Designs" and lacks AEC-Q200 automotive rating. This part is not recommended for automotive applications.

Frequently Asked Questions (FAQ)

Q: Can EEU-FC1C681L be used as a direct replacement for EEU-FC1C681LB?

A: Electrical substitution is valid. Both parts are 680 µF, 16 V, ±20% tolerance with identical impedance (65 mOhms) and thermal life (2000 Hrs @ 105°C). However, lead spacing differs (0.138" vs 0.197"), requiring PCB layout verification. Height is also reduced (0.787" vs 1.024"), which may affect mechanical clearance.

Q: What is the difference between parts marked "Active" and "Not For New Designs"?

A: Parts marked "Active" are in current production and recommended for new designs. Parts marked "Not For New Designs" are legacy components available for existing design support but should not be selected for new development. EEU-FC1C681LB and EEU-FC1C681L are both Active status parts.

Q: Does thermal life rating affect substitution eligibility?

A: Thermal life rating (hours at 105°C) indicates component longevity under specified conditions. Parts with equal or greater thermal life are acceptable substitutes. Parts with lower thermal life require application review. ELXZ160ELL681MJ16S (5000 Hrs) exceeds the main part's 2000 Hrs rating and is acceptable.

Q: Why do some substitutes have different diameters?

A: Diameter variation reflects different internal construction and thermal performance characteristics. Larger diameter parts (0.394" vs 0.315") typically offer improved thermal dissipation. Mechanical envelope constraints must be verified before selecting a substitute with different diameter.

Q: Is AEC-Q200 rating required for all substitutes?

A: AEC-Q200 is an automotive qualification standard. The main part (EEU-FC1C681LB) carries this rating. For automotive applications, substitutes should maintain AEC-Q200 compliance. UPJ1C681MPD lacks this rating and is not suitable for automotive use.

Q: Can impedance differences affect circuit performance?

A: Impedance (ESR) affects ripple current handling and frequency response. The main part specifies 65 mOhms impedance. Substitutes with higher impedance (such as UPS1C681MPD at 140 mOhms) may affect ripple current performance and require circuit analysis. Substitutes with matching or lower impedance are preferred.

Q: What packaging formats are available?

A: The main part is supplied in Tape & Box (TB) format. All listed substitutes are available in Bulk packaging. Tape & Box format is typically used for automated assembly; Bulk format is used for manual assembly or reel requirements. Packaging selection depends on assembly process requirements.

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