Equivalent & Substitute Parts for EEU-FC1C681B

Part Overview

The EEU-FC1C681B is a 680 µF, 16 V aluminum electrolytic capacitor in radial configuration manufactured by Panasonic Electronic Components. This part is rated for 3000 hours at 105°C and meets AEC-Q200 automotive standards. The component is actively produced and widely used in automotive applications requiring reliable energy storage and filtering.

Substitute parts become necessary when the primary part reaches end-of-life status, experiences supply constraints, or when design requirements call for enhanced performance characteristics such as extended operational lifetime or improved ripple current handling.

Key Parameters

Parameter	Value
Capacitance	680 µF
Voltage Rating	16 V
Tolerance	±20%
Lifetime @ 105°C	3000 Hrs
Operating Temperature Range	-55°C to 105°C
Polarization	Polar
Mounting Type	Through Hole
Package Type	Radial, Can
Lead Spacing	0.197" (5.00 mm)
Case Diameter	0.394" (10.00 mm)
Height	0.669" (17.00 mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the EEU-FC1C681B is determined by strict equivalence across the following parameters:

Capacitance value: 680 µF (exact match required)
Voltage rating: 16 V (exact match required)
Tolerance: ±20% (exact match required)
Polarization: Polar (exact match required)
Mounting type: Through Hole (exact match required)
Package type: Radial, Can (exact match required)
Operating temperature range: -55°C to 105°C (exact match required)

Substitute parts are grouped into two categories:

Direct Substitutes (Mechanical and Electrical Equivalence): Parts with identical lead spacing (0.197" / 5.00 mm), case diameter (0.394" / 10.00 mm), and compatible height specifications that allow direct PCB mounting without layout modifications.

Compatible Substitutes (Functional Equivalence with Layout Considerations): Parts with different lead spacing (0.138" / 4.60 mm) or case diameter (0.315" / 8.00 mm) that maintain electrical equivalence but require PCB layout verification before implementation.

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	Tolerance	Lifetime @ 105°C	Lead Spacing	Case Diameter	Height (Max)	Impedance	Product Status
EEU-FC1C681B	Panasonic	680 µF	16 V	±20%	3000 Hrs	0.197" (5.00 mm)	0.394" (10.00 mm)	0.669" (17.00 mm)	68 mOhms	Active
EEU-FC1C681L	Panasonic	680 µF	16 V	±20%	2000 Hrs	0.138" (4.60 mm)	0.315" (8.00 mm)	0.787" (20.00 mm)	65 mOhms	Active
ELXZ160ELL681MJ16S	Chemi-Con	680 µF	16 V	±20%	5000 Hrs	0.197" (5.00 mm)	0.394" (10.00 mm)	0.689" (17.50 mm)	68 mOhms	Active
UPW1C681MPD	Nichicon	680 µF	16 V	±20%	5000 Hrs	0.197" (5.00 mm)	0.394" (10.00 mm)	0.630" (16.00 mm)	68 mOhms	Not For New Designs
UPJ1C681MPD	Nichicon	680 µF	16 V	±20%	5000 Hrs	0.197" (5.00 mm)	0.394" (10.00 mm)	0.846" (21.50 mm)	100 mOhms	Not For New Designs
UPM1C681MPD	Nichicon	680 µF	16 V	±20%	5000 Hrs	0.197" (5.00 mm)	0.394" (10.00 mm)	0.866" (22.00 mm)	65 mOhms	Not For New Designs
UPS1C681MPD	Nichicon	680 µF	16 V	±20%	2000 Hrs	0.197" (5.00 mm)	0.394" (10.00 mm)	0.689" (17.50 mm)	140 mOhms	Not For New Designs
UPW1C681MPD6	Nichicon	680 µF	16 V	±20%	3000 Hrs	0.138" (4.60 mm)	0.315" (8.00 mm)	0.787" (20.00 mm)	65 mOhms	Not For New Designs

Engineering Selection Recommendations

For Active Production Designs:

ELXZ160ELL681MJ16S (Chemi-Con LXZ series) is the preferred upgrade substitute. This part maintains identical lead spacing and case diameter to the EEU-FC1C681B, ensuring direct PCB compatibility without layout modifications. The extended 5000-hour lifetime at 105°C provides enhanced reliability margin compared to the 3000-hour rating of the primary part. Both parts carry ROHS3 compliance and are actively manufactured.

EEU-FC1C681L (Panasonic FC series) is an alternative within the same manufacturer family. This part is actively produced and maintains full electrical equivalence. However, the reduced lead spacing (0.138" vs. 0.197") and smaller case diameter require PCB layout verification. The 2000-hour lifetime rating is lower than the primary part.

For Legacy or Constrained Supply Situations:

UPW1C681MPD (Nichicon UPW series) provides 5000-hour lifetime performance with identical mechanical footprint to the EEU-FC1C681B. This part is marked "Not For New Designs" but remains available in inventory. Use is acceptable for existing production lines or retrofit applications where supply of the primary part is unavailable.

UPM1C681MPD (Nichicon UPM series) offers automotive-grade AEC-Q200 certification with 5000-hour lifetime. The increased height (0.866" vs. 0.669") requires clearance verification on the PCB. REACH status is "Affected," which may require compliance documentation for certain applications.

Not Recommended for New Designs:

UPJ1C681MPD, UPS1C681MPD, and UPW1C681MPD6 are marked "Not For New Designs" and carry either reduced lifetime ratings or non-automotive certifications. These parts are suitable only for legacy system maintenance or when no other alternatives are available.

Frequently Asked Questions (FAQ)

Q: Can EEU-FC1C681L be used as a direct replacement for EEU-FC1C681B?

A: EEU-FC1C681L is electrically equivalent but not mechanically identical. The lead spacing differs (0.138" vs. 0.197"), and the case diameter is smaller (0.315" vs. 0.394"). PCB layout verification is required before substitution. The 2000-hour lifetime is also lower than the primary part's 3000-hour rating.

Q: What is the difference between "Active" and "Not For New Designs" product status?

A: "Active" status indicates the manufacturer continues production and recommends the part for new circuit designs. "Not For New Designs" indicates the part is in mature phase or discontinued for new applications but remains available for existing production support. Parts with this status should not be selected for new product development unless no active alternatives exist.

Q: Is ELXZ160ELL681MJ16S a direct replacement for EEU-FC1C681B?

A: Yes. ELXZ160ELL681MJ16S maintains identical lead spacing (0.197"), case diameter (0.394"), and compatible height (0.689" vs. 0.669"). The part is actively manufactured, ROHS3 compliant, and offers extended 5000-hour lifetime. No PCB layout modifications are required.

Q: Why do some substitute parts have higher impedance values?

A: Impedance variation reflects differences in internal construction and manufacturing process between manufacturers. UPJ1C681MPD (100 mOhms) and UPS1C681MPD (140 mOhms) have higher impedance than the primary part (68 mOhms). Higher impedance may affect ripple current performance and should be evaluated against circuit requirements before substitution.

Q: Can parts marked "Not For New Designs" be used in automotive applications?

A: Parts without AEC-Q200 certification (such as UPW1C681MPD, UPJ1C681MPD, and UPS1C681MPD) are not recommended for new automotive designs. UPM1C681MPD carries AEC-Q200 certification and is suitable for automotive use despite "Not For New Designs" status, but supply continuity should be confirmed with the manufacturer.

Q: What does REACH Affected status mean for UPM1C681MPD?

A: REACH Affected indicates the part contains substances regulated under the REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) directive. Compliance documentation may be required for certain end-use applications or geographic markets. Verify regulatory requirements with your compliance team before selecting this part.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message