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HomeProductsCapacitorsAluminum - Polymer CapacitorsEEF-LR0G121R
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EEF-LR0G121R - Panasonic Electronic Components

Manufacturer Part Number
EEF-LR0G121R
Manufacturer
Panasonic
Allelco Part Number
98D-EEF-LR0G121R
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
49,743 pcs available, New & Original
Parts Description
CAP ALUM POLY 120UF 20% 4V SMD
Package
2917 (7343 Metric)
Data sheet
EEF-LR0G121R.pdf
RoHs Status
ROHS3 Compliant
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Our certification
In stock: 49743
  • Unit Price: $0.619
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $0.619 $0.62
200+ $0.24 $48.00
500+ $0.231 $115.50
1000+ $0.227 $227.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

EEF-LR0G121R Tech Specifications
Panasonic Electronic Components - EEF-LR0G121R technical specifications, attributes, parameters and parts with similar specifications to Panasonic Electronic Components - EEF-LR0G121R

Product Attribute Attribute Value
Manufacturer Panasonic
Voltage - Rated 4 V
Type Polymer
Tolerance ±20%
Surface Mount Land Size 0.287' L x 0.169' W (7.30mm x 4.30mm)
Size / Dimension 0.287' L x 0.169' W (7.30mm x 4.30mm)
Series SP-Cap, LR
Ripple Current @ High Frequency 6.3 A @ 100 kHz
Ratings -
Package / Case 2917 (7343 Metric)
Product Attribute Attribute Value
Package Tape & Reel (TR)
Operating Temperature -55°C ~ 105°C
Mounting Type Surface Mount
Lifetime @ Temp. 2000 Hrs @ 105°C
Lead Spacing -
Height - Seated (Max) 0.039' (1.00mm)
ESR (Equivalent Series Resistance) 9mOhm
Capacitance 120 µF
Base Product Number EEF-LR
Applications General Purpose

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8532.22.0020

Frequently Asked Questions(FAQ)

What makes the EEF-LR0G121R suitable for low-voltage power supply filtering compared to ceramic alternatives?
The EEF-LR0G121R is a 120 µF polymer aluminum capacitor rated at 4 V with 9 mOhm ESR, making it well-suited for post-regulator filtering and bulk energy storage in low-voltage rails where ceramic capacitors would require parallel configurations to achieve equivalent capacitance. The low ESR of the EEF-LR0G121R minimizes voltage droop during transient current events, a critical advantage in 3.3 V and 5 V supply stabilization where ripple rejection directly affects downstream digital logic stability. Polymer technology in the EEF-LR0G121R provides superior ESR stability across temperature and frequency compared to electrolytic aluminum types, reducing the output impedance variation that ceramic stacks would introduce.
How does the 2000-hour lifetime specification at 105°C for the EEF-LR0G121R affect reliability calculations in long-duration applications?
The EEF-LR0G121R is rated for 2000 hours at 105°C, which serves as the reference condition for capacitor aging models. Capacitor lifetime follows an exponential relationship with temperature; for the EEF-LR0G121R, each 10°C reduction approximately doubles operational life. At a typical ambient of 85°C with moderate self-heating, the EEF-LR0G121R can reasonably be expected to reach 8,000–10,000 hours before capacitance degradation approaches the lower tolerance limit. In mission-critical designs, the 2000-hour baseline of the EEF-LR0G121R must be factored into replacement intervals or redundancy strategies if operating continuously above 85°C, particularly in sealed enclosures where thermal dissipation is limited.
Can the EEF-LR0G121R handle sustained ripple currents in synchronous buck converter applications, and what thermal effects should be anticipated?
The EEF-LR0G121R is specified for 6.3 A ripple current at 100 kHz, which aligns with typical synchronous buck converter output filtering stages where switching frequencies range from 200 kHz to 1 MHz. However, ripple current stress on the EEF-LR0G121R scales with frequency; at 500 kHz operation, the safe ripple current would be approximately 10–12 A before self-heating becomes excessive. The 9 mOhm ESR of the EEF-LR0G121R dissipates I²R losses directly: at 6.3 A, power dissipation reaches ~0.36 W, raising the capacitor's internal temperature by 15–25°C above ambient depending on PCB thermal coupling. For designs where the converter operates at elevated switching frequencies or sustained high ripple, paralleling multiple EEF-LR0G121R units or selecting a higher-voltage rated polymer type may be necessary to distribute thermal stress.
How does the ±20% capacitance tolerance of the EEF-LR0G121R compare to film and ceramic alternatives, and when does this tolerance matter in circuit design?
The EEF-LR0G121R carries ±20% capacitance tolerance, typical for polymer aluminum types but wider than modern X7R ceramics (±10%) and significantly wider than film capacitors (±5%). In low-frequency filtering or timing applications where absolute capacitance precision is not critical, the EEF-LR0G121R's tolerance is acceptable; however, in phase-compensation networks, noise-rejection filters, or switched-capacitor circuits, the ±20% tolerance of the EEF-LR0G121R introduces ~10 kHz uncertainty in corner frequencies or charge-transfer accuracy. Designs sensitive to tolerance stack-up should either derate the EEF-LR0G121R capacitance by 20% in worst-case analysis or select matching polymer grades with tighter binning. For general bulk storage and ripple attenuation, the tolerance of the EEF-LR0G121R is not a limiting factor.
What is the minimum effective capacitance of the EEF-LR0G121R across its operating temperature range, and how does this affect stability in thermal cycling?
The EEF-LR0G121R operates from -55°C to 105°C and experiences capacitance drift primarily at elevated temperature due to polymer conductivity changes. Polymer capacitors like the EEF-LR0G121R typically lose 10–15% capacitance from 25°C to 105°C, meaning worst-case minimum capacitance of the EEF-LR0G121R approaches 100 µF (120 µF × 80% tolerance × 85% thermal factor) at the upper temperature extreme. In thermal cycling, the EEF-LR0G121R can develop permanent capacitance hysteresis if temperature swings exceed 80°C repeatedly; designs subject to frequent -40°C to 85°C cycles should monitor the capacitance retention of the EEF-LR0G121R during qualification testing. For worst-case filter pole calculations, use the minimum capacitance figure of the EEF-LR0G121R to ensure margin.
How does the EEF-LR0G121R compare to the EEF-SR0G121R variant in terms of performance trade-offs?
The EEF-LR0G121R and EEF-SR0G121R are both 120 µF polymer capacitors from Panasonic's SP-Cap series, but they differ primarily in ESR and ripple current rating. The EEF-SR0G121R typically features lower ESR (~5 mOhm) and higher ripple current capacity (~10 A at 100 kHz), positioning it for demanding switching-regulator applications where thermal stress and transient response are critical. The EEF-LR0G121R, with 9 mOhm ESR and 6.3 A ripple rating, trades performance for cost and is better suited to general-purpose filtering and moderate-ripple environments. For designs where power dissipation or thermal margin is constrained, the EEF-SR0G121R should be selected; for cost-sensitive applications with modest ripple or non-continuous operation, the EEF-LR0G121R remains practical.
Why is the 2917 (7343 Metric) package size of the EEF-LR0G121R significant for high-density PCB layouts?
The EEF-LR0G121R uses a 2917 (7343 Metric) case measuring 7.30 mm × 4.30 mm with a maximum seated height of 1.00 mm, making it one of the smallest form factors available for 120 µF at 4 V. This compact footprint of the EEF-LR0G121R permits placement directly adjacent to low-voltage supply pins on processors or regulators, minimizing parasitic loop inductance and reducing PCB routing complexity. The low profile of the EEF-LR0G121R (1 mm) is particularly valuable in consumer and mobile applications where vertical clearance is limited. However, the small package of the EEF-LR0G121R constrains thermal dissipation; designers must verify that ripple current remains within safe limits or provide adequate copper thermal spreading beneath the capacitor pads.
At what operating frequency does the EEF-LR0G121R begin to lose effectiveness as a bulk storage element, and what alternative strategies should be considered?
The EEF-LR0G121R is specified for 6.3 A ripple current at 100 kHz; above approximately 500 kHz, the impedance profile of the EEF-LR0G121R transitions from capacitive to inductive due to lead-frame and dielectric losses, reducing its filtering effectiveness. In high-frequency switching supplies (>1 MHz), the EEF-LR0G121R should be paired with ceramic bypass capacitors to handle the high-frequency harmonics while the EEF-LR0G121R addresses lower-frequency ripple and energy storage. Alternatively, selecting a lower-ESR variant such as the EEF-SR0G121R or paralleling multiple EEF-LR0G121R units can extend the effective frequency response and maintain impedance control across a broader bandwidth.
Is the EEF-LR0G121R suitable for automotive-grade reliability requirements, and what qualification testing should be verified?
The EEF-LR0G121R does not carry explicit automotive-qualified status; it is classified as a general-purpose component. For automotive applications requiring AEC-Q200 qualification, alternative part numbers within Panasonic's portfolio or competing manufacturers should be evaluated. If the EEF-LR0G121R is used in non-safety-critical automotive circuits, validation should include extended temperature cycling (-40°C to 125°C, minimum 10 cycles), vibration testing per MIL-STD-810, and moisture ingress resistance (IPC-A-610). The 2000-hour rating at 105°C of the EEF-LR0G121R may not meet automotive mission-profile requirements for 10+ year vehicle lifetime; derating to 50–60% stress margins and parallel redundancy of the EEF-LR0G121R units is recommended for critical supply rails.
How does moisture absorption in the EEF-LR0G121R polymer dielectric affect long-term reliability in humid or marine environments?
Polymer aluminum capacitors like the EEF-LR0G121R are generally more resilient to moisture than ceramic multilayer types, but the dielectric and lead frame can still absorb moisture in high-humidity (>85% RH) or salt-spray environments. Over extended periods, moisture ingress can increase ESR and leakage current in the EEF-LR0G121R, reducing filtering performance and increasing dissipation. For marine or high-humidity applications, the EEF-LR0G121R should be potted or conformal-coated to create a moisture barrier, and initial electrical verification should be repeated after humidity stress testing (per IPC-TM-650 2.6.3) to confirm no degradation. The RoHS3-compliant manufacturing process of the EEF-LR0G121R does not inherently provide enhanced moisture resistance; additional protective measures are necessary for reliable long-term operation in adverse climates.
What is the DC leakage current specification of the EEF-LR0G121R, and does it affect quiescent power budgets in battery-powered devices?
The EEF-LR0G121R's DC leakage current is not explicitly listed in the provided datasheet parameters but is typical for polymer aluminum capacitors at approximately 0.5–1 µA per µF at rated voltage, implying roughly 60–120 µA for the EEF-LR0G121R at 4 V and 25°C. In battery-powered applications with microampere-level sleep currents, this leakage from the EEF-LR0G121R is a secondary contributor to quiescent drain but should not be ignored in ultra-low-power designs. At elevated temperature (105°C), leakage current in the EEF-LR0G121R can increase 3–5 fold, becoming a more significant power sink. For devices targeting multi-year battery life on coin cells, verify the combined leakage of all capacitors including the EEF-LR0G121R in both standby and active thermal states, and use series resistors or load-switching strategies to isolate large-value capacitors when not in use.
How do soldering profiles and thermal shock affect the mechanical integrity and electrical performance of the EEF-LR0G121R?
The EEF-LR0G121R, packaged in Surface Mount 2917 case, experiences mechanical stress during reflow soldering due to thermal gradients and thermal-expansion mismatch between the aluminum case, solder, and PCB. Standard reflow profiles (peak temperature 260°C, ramp rate 2–3°C/s) are within the polymer capacitor thermal limits, but rapid cooling or thermal shock (cooling rate >5°C/s) can cause microcracking in the dielectric or solder joints of the EEF-LR0G121R. Post-reflow electrical testing of the EEF-LR0G121R for ESR and capacitance is recommended to detect thermally induced defects early. Board-level thermal cycling from 0°C to 85°C after assembly should be performed under loaded conditions; the EEF-LR0G121R may shift capacitance by 2–3% per thermal cycle during the first 10–20 cycles before stabilizing, a normal characteristic of polymer dielectrics.
Can the EEF-LR0G121R be paralleled with other capacitor types (ceramic, film) to optimize filtering performance, and what precautions are necessary?
Paralleling the EEF-LR0G121R with high-K ceramic (X5R, X7R) or film capacitors is a common design practice to combine the bulk energy storage of the EEF-LR0G121R with the high-frequency response of ceramics. However, several precautions apply: (1) the EEF-LR0G121R and ceramics have different impedance curves and temperature coefficients, potentially creating impedance peaks at certain frequencies; (2) unequal current distribution can occur if routing inductance to the EEF-LR0G121R differs from ceramic paths, causing over-stress on one capacitor type; (3) voltage sharing at turn-on may cause the EEF-LR0G121R to charge faster than ceramics due to lower initial ESR, creating transient stress. To mitigate, keep the EEF-LR0G121R and ceramic capacitor pads closely spaced, use separate vias for each type, and simulate the paralleled impedance profile using measured ESR and inductance models to confirm no resonant peaks occur within the switching-frequency band.
What is the expected lifetime degradation curve for the EEF-LR0G121R, and how should accelerated life test (ALT) data be interpreted for mission-profile predictions?
Capacitor lifetime models follow a power-law relationship: L(T) = L₀ × (T_ref / T_op)^n, where n ≈ 5–6 for polymer aluminum types like the EEF-LR0G121R. Given the 2000-hour reference at 105°C, projected lifetime of the EEF-LR0G121R at 55°C would be approximately 50,000–65,000 hours, and at 25°C, over 200,000 hours. However, this calculation assumes continuous operation; real-world duty cycles with idle periods extend the EEF-LR0G121R's usable life significantly. ALT data for the EEF-LR0G121R should be cross-referenced with measured capacitance and ESR degradation post-test; if capacitance drops >15% or ESR doubles after 1000 hours at 105°C, the EEF-LR0G121R exhibits premature aging that may indicate batch variability or manufacturing defects. Field-reliability predictions for the EEF-LR0G121R should use 50–60% de-rated stress margins and assume worst-case thermal scenarios (continuous 85°C operation) unless detailed thermal analysis confirms lower actual operating temperatures.

Parts with Similar Specifications

The three parts on the right have similar specifications to Panasonic Electronic Components EEF-LR0G121R

Product Attribute EEF-LR0E181R4 EEF-LR0D221R4 EEF-LR0D221R EEF-LR0E181R
Part Number EEF-LR0E181R4 EEF-LR0D221R4 EEF-LR0D221R EEF-LR0E181R
Manufacturer Panasonic Electronic Components Panasonic Electronic Components Panasonic Electronic Components Panasonic Electronic Components
Voltage - Rated - - - -
Capacitance - - - -
Ripple Current @ High Frequency - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Base Product Number - DAC34H84 MAX500 ADS62P42
Lead Spacing - - - -
Applications - - - -
Ratings - - - -
Height - Seated (Max) - - - -
Type - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Tolerance - - - -
Surface Mount Land Size - - - -
Series - - - -
ESR (Equivalent Series Resistance) - - - -
Lifetime @ Temp. - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Size / Dimension - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)

EEF-LR0G121R Datasheet PDF

Download EEF-LR0G121R pdf datasheets and Panasonic Electronic Components documentation for EEF-LR0G121R - Panasonic Electronic Components.

HTML Datasheet
Cylindrical Battery Holders.pdf

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EEF-LR0G121R Image

EEF-LR0G121R

Panasonic Electronic Components
98D-EEF-LR0G121R

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