EEU-FC1E121B Equivalent & Substitute Parts

Part Overview

The EEU-FC1E121B is a 120 µF, 25 V aluminum electrolytic capacitor in radial, can package manufactured by Panasonic Electronic Components. This part is classified as obsolete, with a rated lifetime of 1000 hours at 105°C and AEC-Q200 automotive qualification. Due to its obsolete status, equivalent substitute parts with improved specifications or active product availability are necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Capacitance	120 µF
Voltage Rating	25 V
Tolerance	±20%
Package Type	Radial, Can
Mounting Type	Through Hole
Polarization	Polar
Operating Temperature Range	-55°C ~ 105°C
Lifetime @ 105°C	1000 Hrs (main part)

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following mandatory parameters:

Capacitance: 120 µF (exact match required)
Voltage Rating: 25 V (exact match required)
Tolerance: ±20% (exact match required)
Package Type: Radial, Can (exact match required)
Mounting Type: Through Hole (exact match required)
Polarization: Polar (exact match required)
Operating Temperature Range: -55°C ~ 105°C (exact match required)

All substitute parts listed meet these core electrical and mechanical parameters. Variations in secondary parameters such as lifetime rating, impedance, ripple current specifications, lead spacing, and physical dimensions are permitted within the constraints of the radial can package form factor and through-hole mounting requirement.

Parameter Comparison

Parameter	EEU-FC1E121B (Panasonic)	ELXY250ELL121MF15D (Chemi-Con)	UPJ1E121MED (Nichicon)	UPM1E121MED (Nichicon)	UPV1E121MGD (Nichicon)	UPW1E121MED (Nichicon)
Capacitance	120 µF	120 µF	120 µF	120 µF	120 µF	120 µF
Voltage Rating	25 V	25 V	25 V	25 V	25 V	25 V
Tolerance	±20%	±20%	±20%	±20%	±20%	±20%
Operating Temperature	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C
Lifetime @ 105°C	1000 Hrs	2000 Hrs	2000 Hrs	2000 Hrs	5000 Hrs	2000 Hrs
Package / Case	Radial, Can	Radial, Can	Radial, Can	Radial, Can	Radial, Can	Radial, Can
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Polarization	Polar	Polar	Polar	Polar	Not specified	Polar
Size / Dimension	0.248" Dia (6.30mm)	0.248" Dia (6.30mm)	0.248" Dia (6.30mm)	0.248" Dia (6.30mm)	0.315" Dia (8.00mm)	0.248" Dia (6.30mm)
Height - Seated (Max)	0.728" (18.50mm)	0.650" (16.50mm)	0.630" (16.00mm)	0.650" (16.50mm)	0.512" (13.00mm)	0.591" (15.00mm)
Lead Spacing	0.197" (5.00mm)	0.098" (2.50mm)	0.098" (2.50mm)	0.098" (2.50mm)	0.138" (4.60mm)	0.098" (2.50mm)
Impedance	250 mOhms	250 mOhms	320 mOhms	200 mOhms	340 mOhms	230 mOhms
Ripple Current @ 120 Hz	260 mA	156 mA	275 mA	275 mA	Not specified	279.5 mA
Ripple Current @ High Frequency	400 mA @ 100 kHz	390 mA @ 100 kHz	405 mA @ 10 kHz	405 mA @ 10 kHz	Not specified	430 mA @ 100 kHz
Product Status	Obsolete	Active	Obsolete	Obsolete	Not For New Designs	Obsolete
AEC-Q200 Automotive Rating	Yes	Yes	Not specified	Yes	Not specified	Not specified
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Automotive Applications with AEC-Q200 Requirement: ELXY250ELL121MF15D (Chemi-Con LXY series) or UPM1E121MED (Nichicon UPM series) are suitable substitutes. Both maintain AEC-Q200 automotive qualification and offer improved lifetime ratings (2000 hours at 105°C) compared to the original EEU-FC1E121B. ELXY250ELL121MF15D is currently active in production, providing superior long-term availability.

For General Purpose Applications: UPW1E121MED (Nichicon UPW series) provides a direct functional equivalent with 2000-hour lifetime rating and active inventory availability. UPJ1E121MED (Nichicon UPJ series) offers comparable specifications but with obsolete product status.

For Extended Lifetime Requirements: UPV1E121MGD (Nichicon UPV series) provides the highest lifetime rating at 5000 hours at 105°C. This part is classified as "Not For New Designs" and has larger physical dimensions (0.315" diameter, 13.00mm height) compared to the original part, requiring PCB layout verification.

Physical Footprint Considerations: All substitute parts except UPV1E121MGD maintain the 0.248" (6.30mm) diameter specification. Lead spacing varies from 0.098" (2.50mm) to 0.138" (4.60mm), differing from the original 0.197" (5.00mm). PCB hole pattern verification is required before implementation.

Frequently Asked Questions (FAQ)

Q: Can I use UPV1E121MGD as a direct replacement for EEU-FC1E121B? A: UPV1E121MGD meets all core electrical parameters (120 µF, 25 V, ±20%, polar, through-hole radial can). However, it has a larger diameter (0.315" vs. 0.248") and different lead spacing (0.138" vs. 0.197"), requiring PCB layout verification before implementation.

Q: Which substitute offers the best availability? A: ELXY250ELL121MF15D (Chemi-Con) is the only substitute with active product status and the highest inventory level (17,533 pcs). All Nichicon alternatives are either obsolete or not recommended for new designs.

Q: Are all substitutes RoHS3 compliant? A: All listed substitutes are RoHS3 compliant. The original EEU-FC1E121B RoHS status is not specified in the provided data.

Q: What is the impact of different lead spacing on PCB design? A: The original part has 0.197" (5.00mm) lead spacing. Most substitutes use 0.098" (2.50mm) spacing, requiring PCB hole pattern modification. UPV1E121MGD uses 0.138" (4.60mm) spacing. Verify PCB design compatibility before part selection.

Q: Do all substitutes maintain automotive qualification? A: ELXY250ELL121MF15D and UPM1E121MED retain AEC-Q200 automotive qualification. UPJ1E121MED, UPV1E121MGD, and UPW1E121MED do not specify AEC-Q200 rating in the provided data.

Q: What is the difference in impedance between the original and substitutes? A: Original impedance is 250 mOhms. Substitutes range from 200 mOhms (UPM1E121MED) to 340 mOhms (UPV1E121MGD). Lower impedance generally indicates better high-frequency performance characteristics.

Q: Can I use a substitute with lower ripple current rating? A: ELXY250ELL121MF15D has lower ripple current at 120 Hz (156 mA vs. 260 mA). Verify that your circuit's ripple current requirements do not exceed the substitute's rated specifications before implementation.

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