Datasheet
6© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 • 864-963-6300 • www.kemet.com A4035_PEH169_85ºC • 2/7/2017
Screw Terminal Aluminum Electrolytic Capacitors – PEH169 Series, +85°C
MTBF
The mean time between failures (MTBF) is simply the inverse of the failure rate.
MTBF= 1/λ
wear out
early failures
operational life
Failure Rate
Time
The failure rate is derived from our periodic test results. The failure rate (λ
R
) is, therefore, only given at test temperature for
life tests. An estimation is also given at 60°C.
The expected failure rate for this capacitor range is based on our periodic test results for capacitors with structural
similarity.
T
a
Failure Rate per Hour
60°C 100 FIT
Failure rate per hour includes both catastrophic and parametric failures.
Environmental Compliance
As an environmentally conscious company, KEMET is working continuously with improvements concerning the environmental
effects of both our capacitors and their production. In Europe (RoHS Directive) and in some other geographical areas like
China, legislation has been put in place to prevent the use of some hazardous materials, such as lead (Pb), in electronic
equipment. All products in this catalog are produced to help our customers’ obligations to guarantee their products and fulll
these legislative requirements. The only material of concern in our products has been lead (Pb), which has been removed
from all designs to fulll the requirement of containing less than 0.1% of lead in any homogeneous material. KEMET will
closely follow any changes in legislation world wide and makes any necessary changes in its products, whenever needed.
Some customer segments such as medical, military and automotive electronics may still require the use of lead in electrode
coatings. To clarify the situation and distinguish products from each other, a special symbol is used on the packaging labels
for RoHS compatible capacitors.
Because of customer requirements, there may appear additional markings such as LF = Lead Free or LFW = Lead Free Wires
on the label.