EEF-UD0G151R Equivalent & Substitute Parts

Part Overview

The Panasonic EEF-UD0G151R is a 150 µF, 4 V aluminum polymer surface mount capacitor in the 2917 (7343 Metric) package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The EEF-UD series has been superseded by more advanced polymer capacitor lines with improved performance characteristics, including extended lifetime ratings and lower equivalent series resistance in select alternatives.

Key Parameters

Parameter	Value
Capacitance	150 µF
Voltage Rating	4 V
Tolerance	±20%
ESR (Equivalent Series Resistance)	15 mOhm
Lifetime @ Temperature	1000 Hrs @ 105°C
Operating Temperature Range	-40°C ~ 105°C
Package / Case	2917 (7343 Metric)
Mounting Type	Surface Mount
Type	Aluminum Polymer

Substitute Part Grouping Explanation

Substitution for the EEF-UD0G151R is determined by strict equivalence in the following parameters:

Capacitance: 150 µF (exact match required)
Voltage Rating: 4 V (minimum; higher voltage ratings are acceptable upgrades)
Tolerance: ±20% (standard tolerance maintained)
Package / Case: 2917 (7343 Metric) (physical and electrical compatibility)
Mounting Type: Surface Mount (PCB assembly compatibility)
Type: Aluminum Polymer (material class)

Substitute parts are grouped into two categories:

Direct Equivalents maintain all primary electrical parameters while offering improved reliability through extended lifetime ratings and compliance certifications.

Upgrade Options maintain core electrical parameters but offer higher voltage ratings, lower ESR, or improved thermal performance, suitable for designs requiring enhanced performance margins.

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	ESR (mOhm)	Lifetime @ 105°C	Operating Temp Range	Product Status	Height (Max)
EEF-UD0G151R	Panasonic	150 µF	4 V	15	1000 Hrs	-40°C ~ 105°C	Obsolete	0.118" (3.00 mm)
EEF-CX0G151R	Panasonic	150 µF	4 V	15	2000 Hrs	-55°C ~ 105°C	Active	0.075" (1.90 mm)
EEF-CX0J151R	Panasonic	150 µF	6.3 V	15	2000 Hrs	-55°C ~ 105°C	Active	0.075" (1.90 mm)
EEF-SX0G151E7	Panasonic	150 µF	4 V	7	2000 Hrs	-55°C ~ 105°C	Active	0.079" (2.00 mm)
EEF-SX0G151ER	Panasonic	150 µF	4 V	9	2000 Hrs	-55°C ~ 105°C	Active	0.079" (2.00 mm)
ECASD40G157M016K00	Murata Electronics	150 µF	4 V	16	1000 Hrs	-40°C ~ 105°C	Obsolete	0.075" (1.90 mm)

Engineering Selection Recommendations

For Direct Replacement with Enhanced Reliability:

EEF-CX0G151R is the primary direct equivalent. It maintains identical electrical specifications (150 µF, 4 V, 15 mOhm ESR) while doubling the lifetime rating to 2000 hours at 105°C. The part is active in production, RoHS3 compliant, and REACH unaffected. The reduced height (1.90 mm vs. 3.00 mm) provides additional design flexibility for space-constrained applications.

For Voltage Margin Enhancement:

EEF-CX0J151R provides a 6.3 V rating while maintaining the same 150 µF capacitance and 15 mOhm ESR. This upgrade is suitable for designs requiring additional voltage headroom or operating in environments with voltage transients. The part is active and carries the same compliance certifications as EEF-CX0G151R.

For Low-ESR Performance:

EEF-SX0G151E7 and EEF-SX0G151ER offer reduced ESR (7 mOhm and 9 mOhm respectively) compared to the original 15 mOhm specification. Both maintain 150 µF capacitance at 4 V with 2000-hour lifetime ratings. These options are suitable for high-ripple-current applications or designs sensitive to impedance characteristics. Both are active products with full compliance certifications.

Avoid:

ECASD40G157M016K00 (Murata) is obsolete and offers no performance advantage over the original part. It maintains the same 1000-hour lifetime and provides no compliance or reliability improvement.

Frequently Asked Questions (FAQ)

Q: Can I use EEF-CX0J151R (6.3 V) as a direct replacement for EEF-UD0G151R (4 V)?

A: Yes. The 6.3 V rating is a voltage upgrade that maintains full backward compatibility. The capacitance (150 µF), tolerance (±20%), and ESR (15 mOhm) are identical. The higher voltage rating provides additional design margin without affecting circuit operation at 4 V nominal.

Q: What is the difference between EEF-SX0G151E7 and EEF-SX0G151ER?

A: Both are 150 µF, 4 V aluminum polymer capacitors in the 2917 package with 2000-hour lifetimes. The primary difference is ESR: EEF-SX0G151E7 has 7 mOhm ESR with 7 A ripple current capability at 100 kHz, while EEF-SX0G151ER has 9 mOhm ESR with 6.3 A ripple current capability. Select based on ripple current requirements.

Q: Why is the EEF-UD0G151R obsolete?

A: The EEF-UD series has been discontinued in favor of the EEF-CX and EEF-SX series, which offer extended lifetime ratings (2000 hours vs. 1000 hours), improved temperature range (-55°C to 105°C vs. -40°C to 105°C), and active production status with full compliance certifications.

Q: Will the reduced height of EEF-CX0G151R (1.90 mm vs. 3.00 mm) affect PCB layout?

A: No. The reduced height is a physical improvement that provides additional clearance for PCB assembly and component placement. The footprint (7.30 mm × 4.30 mm) and electrical performance remain identical. Existing PCB designs will accommodate this part without modification.

Q: Are all substitute parts RoHS3 and REACH compliant?

A: The active Panasonic parts (EEF-CX0G151R, EEF-CX0J151R, EEF-SX0G151E7, EEF-SX0G151ER) are RoHS3 compliant and REACH unaffected. The obsolete Murata part (ECASD40G157M016K00) is RoHS3 compliant but offers no advantage for new designs.

Q: Can I mix different substitute parts in the same design?

A: Yes, provided the circuit design accommodates the parameter variations. All listed substitutes maintain 150 µF capacitance and 4 V minimum voltage rating. Designs sensitive to ESR should standardize on a single part to ensure consistent ripple current performance and thermal characteristics across the assembly.

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