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Load Life - Endurance Information - Comparison

 
 
 Load Life - Endurance and Failure Rate Comparison:  Liquid | Solid
Liquid Electrolyte Aluminum Electrolytic Capacitors ( including HYBRID NSPE )


Aluminum electrolytic capacitors with non-solid (liquid) electrolyte, are limited life components which are classified by the guaranteed life period (Load Life Rating) at the maximum operating temperature. The estimate field failure rate (FIT) is based upon the load life test data at maximum rated temperature (+85°C, +105°C, +125°C, +135°C & +150°C).
 

NIC Series Estimated
Field Failure Rate*

 Life Formula
 

 +105°C = 2000 hrs
 +85°C = 8000 hrs
 +65°C = 32,000 hrs (3.6 yrs)
 +45°C = 128,000 hrs (14.6 yrs)


* - At +45°C and 60%
confidence level

1 FIT = 1 FAILURE in
1,000,000,000 HOURS 


arrowRipple Current Correction Factors for Aluminum Electrolytic Capacitors
1. Frequency Correction
2. Temperature Correction
[ pdf LINK ]

SMT V-Chip Format

NACE (+85°C / General Purpose)
Total Test Duration = 117,640,000 Hrs
Failure rate (FIT) = 8
MTTF (Hour) = 1.28E+08
Updated Date: 2010/4

NACZ (+105°C / Low ESR)
Total Test Duration = 200,880,000 Hrs
Failure rate (FIT) = 5
MTTF (Hour) = 2.19E+08
Updated Date: 2010/4
NSPE (+105°C / HYBRID / Low ESR)
Total Test Duration = 15,300,000 Hrs
Failure rate (FIT) = 60
MTTF (Hour) = 1.67E+07
Updated Date: 2010/4
Radial LDD
NRSA (+85°C / General Purpose)
Total Test Duration = 117,640,000 Hrs
Failure rate (FIT) = 8
MTTF (Hour) = 1.28E+08
Updated Date: 2010/4
NRSG (+105°C / Low ESR)
Total Test Duration = 97,090,000 Hrs
Failure rate (FIT) = 9
MTTF (Hour) = 1.06E+08
Updated Date: 2010/4

 

Load Life Estimation Guideline [ document ]

Typical Load Life Test Results [ document ] arrowExample: 10,000 Hour Test Results HYBRID NSPE

 

When operating at temperatures less than the RATED MAXIMUM use the below table in estimation of LOAD LIFE - ENDURANCE PERFORMANCE (hours) of Liquid Electrolyte Aluminum Electrolytic Capacitors

Reduced Operating Temperature Life Estimation Graphs [ document]

 
  RATING (hours)  

 

+35°C +45°C +55°C +65°C +75°C +85°C
32,000 16,000 8,000 4,000 2,000 1,000
64,000 32,000 16,000 8,000 4,000 2,000
96,000 48,000 24,000 12,000 6,000 3,000
128,000 64,000 32,000 16,000 8,000 4,000
>15 yrs 80,000 40,000 20,000 10,000 5,000
  RATING (hours)  
+35°C +45°C +55°C +65°C +75°C +85°C +95°C +105°C
128,000 64,000 32,000 16,000 8,000 4,000 2,000 1,000
>15 yrs 128,000 64,000 32,000 16,000 8,000 4,000 2,000
>15 yrs >15 yrs 96,000 48,000 24,000 12,000 6,000 3,000
>15 yrs >15 yrs 128,000 64,000 32,000 16,000 8,000 4,000
>15 yrs >15 yrs >15 yrs 80,000 40,000 20,000 10,000 5,000
  RATING (hours)
+35°C +45°C +55°C +65°C +75°C +85°C +95°C +105°C +115°C +125°C
>15 yrs >15 yrs 128,000 64,000 32,000 16,000 8,000 4,000 2,000 1,000
>15 yrs >15 yrs >15 yrs 96,000 48,000 24,000 12,000 6,000 3,000 1,500
>15 yrs >15 yrs >15 yrs 128,000 64,000 32,000 16,000 8,000 4,000 2,000

16,000 hours = 1.83 years  |  24,000 hours = 2.74 years
32,000 hours = 3.65 years  |  48,000 hours = 5.48 years
64,000 hours = 7.31 years  |  96,000 hours = 11.0 years
128,000 hours = 14.6 years  |  >132,000 hours = >15 years
15 years is EIAJ-RCR-2367A maximum limit in view of the deterioration of capacitor seal materials
 
:: Wear-Out Accelerators
Electrical Overstress | Corrosive Agents | Reduced Pressure

:: Load Life Rating Follows Arrhenius Rate Law
Temperature increase of 10°C approximately doubles the rate of the reaction

+ End-seal and electrolyte directly relates to component load life rating
+ In-circuit wear out rate is chiefly dependent upon operating temperature

 


Solid Electrolyte Electrolytic Capacitors  

(Functional Polymer) Solid Aluminum Electrolytic & Tantalum Electrolytic
Solid electrolytic capacitors are not limited with regards to operational life. They can operate far longer, and do not exhibit wear-out (dry-out) limitations of liquid electrolyte construction (see above).
» The table below compares estimated FIT rates of solid aluminum electrolytic type as compared to tantalum type.
» Lower FIT rate indicates longer time to failure

 
Type NIC Series Package Features / Construction Estimated
Failure Rate (FIT) - Endurance
SOLID ALUMINUM
Electrolytic Capacitor
NPC

NSP
 
Molded Flat Chip
Low Profile 
Lower ESL**
  Stacked
Element

P/N: NSP101M6.3TRD3TR [100uF / 6.3VDC]
Acceleration Test Results @ Rated VDC & 105°C:
» Total Test Time = 19,796,000 hours
» No. of Failure = 0
» Failure Rate (FR) = 46 FIT
(60% confidence; 0.917/T)
Under typical use conditions: 6.3VDC & +25°C; Failure Rate (FR) = 5.7 FIT
Field Failure Reporting:
» Total Test Time = 6,856,894,000 hours
» No. of Failure = 0
» Failure Rate (FR) = 0.13 FIT
(60% confidence; 0.917/T)

NPC Series - Failure Rate / MTTF
» Acceleration Test Results @ Rated VDC & 105°C
» Test Conditions: 2000HR @+105°C
» Total Testing Time (Hour) = 5,880,000
» No. of Failure = 0
» Failure Rate (FR) = 156 FIT
(60% confidence; 0.917/T)
» MTTF (Hour) = 6.41 X 10^6 hrs

Guideline: LINK
» FIT Rate Comparison (NPC to NSP)
» Typical Load Life Test Results to 10,000 hours @ +105°C

TANTALUM
Electrolytic  Capacitor
NTC-T
(MnO2
Cathode)

NTP
(Polymer
Cathode)
Molded Flat Chip
Small Size
 Pressed
Element
» Failure Rate (FR) = 74 FIT
@ 50% voltage de-rating & 3ohm/Volt series resistance
Guideline: LINK

** - ESL - Equivalent Series Inductance (nH):  Lower ESL means better performance at high frequency

1 FIT = 1 FAILURE IN 1,000,000,000 HOURS 
 

Life Formula 

 +105°C = 2000 hrs
 +85°C = 20,000 hrs
 +65°C = 200,000 hrs
10,000 hours = 1.14 years  |  20,000 hours = 2.28 years
30,000 hours = 3.42 years  |  40,000 hours = 4.57 years
100,000 hours = 11.4 years  |  200,000 hours = 22.8 years
NOTES:
  • Solid aluminum type (NPC & NSP) exhibit better performance (than standard tantalum types) under short-circuit failure modes.

  • The cathode material [Polyethylene -Dioxythiophene (PEDT)] exhibits increased resistance, which acts to limit - restrict current flow thru shorted element. This will occur as internal heat reaches +300°C
 
 

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