Samsung SCLSeries RELIABILITY OF TANTALUM CAPACITORS, K K, K

SCL Series
●RELIABILITY OF TANTALUM CAPACITORS
▶General
The failure rate of the tantalum capacitor varies with the digression ratio, ambient temperature, circuit
resistance, circuit application, etc.
Therefore, when proper selections are made so as to afford additional margins, higher reliability can
be derived from the tantalum capacitors. Some examples of actual failure rates are presented below
for your reference.
▶Failure Rate Calculation Formula
The tantalum capacitors are designed to work at their basic failure
rates shown in Table 3 that prevail when the rated voltage is applied for 1000 hours at 85℃.
Table 3 Basic failure rate
▷Failure rate calculation formula
λuse = λ85 x KVxK
R
λuse : Estimated capacitor failure rate under the operating conditions.
λ85 : Basic failure rate (Table 3)
KV : Failure rate correction coefficient by the ambient temperature andderating factor.
KR : Failure rate correction coefficient by the circuit resistance,
which is the series-connected resistance divided by the voltage applied to the capacitor.
This resistance is connected in series when the powersupply side is viewed from the capacitor side.
K(deratingfactor)=operating voltage/rated voltage
TYPE Classification B asic failure rate
SCE,SVE Low ESR type
1%/1000h
SCM,S VM Ultra-Miniaturizat ion Type(0603)
SCL Low-profile Ty pe
SCS,SVS Small Type
SCN,SV N Standa rd type
PC* Conductiv e Polymer Type