EEF-UD0J121R Equivalent & Substitute Parts

Part Overview

The EEF-UD0J121R is a 120 µF, 6.3 V aluminum polymer capacitor in 2917 (7343 Metric) surface mount package manufactured by Panasonic Electronic Components. This part is classified as obsolete, making substitute components necessary for new designs and ongoing production requirements. The UD series has been superseded by active product lines offering improved performance characteristics and extended component availability.

Key Parameters

Parameter	Value
Capacitance	120 µF
Voltage Rating	6.3 V
Tolerance	±20%
Type	Aluminum Polymer
Package	2917 (7343 Metric)
Mounting Type	Surface Mount
ESR	15 mOhm
Lifetime @ 105°C	1000 Hrs
Operating Temperature Range	-40°C to 105°C

Substitute Part Grouping Explanation

Substitution for the EEF-UD0J121R is determined by strict equivalence in the following parameters:

Capacitance: 120 µF (exact match required)
Voltage Rating: 6.3 V (exact match required)
Tolerance: ±20% (exact match required)
Package: 2917 (7343 Metric) (exact match required)
Mounting Type: Surface Mount (exact match required)
Type: Aluminum Polymer (exact match required)

Substitute parts may differ in ESR, lifetime rating, operating temperature range, and height when these variations do not compromise circuit performance. All identified substitutes maintain identical electrical specifications for capacitance, voltage, and tolerance, ensuring direct functional replacement in the specified application.

Parameter Comparison

Parameter	EEF-UD0J121R (Main)	EEF-CX0J121R (Direct)	EEF-SX0J121E7 (Similar)
Capacitance	120 µF	120 µF	120 µF
Voltage Rating	6.3 V	6.3 V	6.3 V
Tolerance	±20%	±20%	±20%
Type	Aluminum Polymer	Aluminum Polymer	Aluminum Polymer
Package	2917 (7343 Metric)	2917 (7343 Metric)	2917 (7343 Metric)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
ESR	15 mOhm	15 mOhm	7 mOhm
Lifetime @ 105°C	1000 Hrs	2000 Hrs	2000 Hrs
Operating Temperature Range	-40°C to 105°C	-55°C to 105°C	-55°C to 105°C
Height - Seated (Max)	0.118" (3.00 mm)	0.075" (1.90 mm)	0.079" (2.00 mm)
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

EEF-CX0J121R is the direct substitute for EEF-UD0J121R. Both parts maintain identical ESR at 15 mOhm and equivalent electrical performance. The EEF-CX0J121R offers extended lifetime (2000 Hrs @ 105°C versus 1000 Hrs), expanded operating temperature range (-55°C to 105°C), reduced height (1.90 mm versus 3.00 mm), and active product status with RoHS3 and REACH compliance. This part is suitable for direct replacement in existing designs.

EEF-SX0J121E7 is an alternative substitute with superior ESR performance (7 mOhm versus 15 mOhm) and higher ripple current capability (7 A @ 100 kHz). The EEF-SX0J121E7 also provides 2000 Hrs lifetime and expanded temperature range. Selection of this part is appropriate for applications requiring lower impedance or higher ripple current handling. Height difference (2.00 mm) is minimal and unlikely to impact PCB layout in most applications.

Both substitute parts are active products with full compliance documentation, ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can EEF-CX0J121R directly replace EEF-UD0J121R without circuit modification?

A: Yes. Both parts share identical capacitance (120 µF), voltage rating (6.3 V), tolerance (±20%), ESR (15 mOhm), and package (2917). The EEF-CX0J121R is a direct functional equivalent. The reduced height (1.90 mm versus 3.00 mm) may require PCB layout adjustment but does not affect electrical performance.

Q: What is the advantage of EEF-SX0J121E7 over EEF-CX0J121R?

A: The EEF-SX0J121E7 offers lower ESR (7 mOhm versus 15 mOhm) and higher ripple current capability (7 A @ 100 kHz versus 5.1 A @ 100 kHz). These characteristics reduce heat generation and improve performance in high-frequency applications. Both parts maintain identical capacitance, voltage, and tolerance specifications.

Q: Are there packaging differences between the substitutes?

A: All three parts use the 2917 (7343 Metric) surface mount package with identical land size (7.30 mm × 4.30 mm). Height varies: EEF-UD0J121R (3.00 mm), EEF-CX0J121R (1.90 mm), and EEF-SX0J121E7 (2.00 mm). PCB clearance and component placement must be verified for the selected substitute.

Q: Which substitute should be selected for new designs?

A: EEF-CX0J121R is recommended for direct replacement with minimal design changes. EEF-SX0J121E7 is recommended for applications requiring superior ESR performance or higher ripple current handling. Both parts are active products with established supply availability.

Q: Do the substitutes have compliance certifications?

A: Both EEF-CX0J121R and EEF-SX0J121E7 are RoHS3 compliant and REACH unaffected. The original EEF-UD0J121R carries no compliance documentation due to obsolete status.

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