Medium Power Film Capacitors
FB (RoHS Compliant)
The FB series uses a non-impregnated metallized
polypropylene dielectric specially treated to have a very high
dielectric strength in operating conditions up to 100°C.
The FB has been designed for printed circuit board
mounting. FB series performance characteristics make them
a viable alternative to aluminum electrolytic technology due
to much lower ESR and much higher surge voltage
capability (dv/dt).
APPLICATIONS
The FB capacitor is particularly designed for DC filtering, low
reactive power.
HOT SPOT CALCULATION
See Hot Spot Temperature, page 3.
θhot spot = θambient + (Pd + Pt) x Rth
with Pd (Dielectric losses) = Q x tgδ0
1
Q x tgδ0 ⇒ [ ⁄
2
x Cn x (Vpeak peak)2 x f ] x tgδ0
to
tgδ0 (tan delta)
For polypropylene, tgδ0 = 2 x 10-4 for frequencies
up to 1MHz and is independent of temperatures.
2
Pt (Thermal losses) = Rs x (Irms
)
where
Cn in Farad
V in Volt
Irms in Ampere
Rs in Ohm
f in Hertz
θ in °C
Rth in °C/W
OPERATING TEMPERATURE RANGE
PACKAGING MATERIAL
Operating temperature range: -40ºC to +100ºC
Self-extinguishing plastic case (V0 = in accordance with UL 94)
filled thermosetting resin.
LIFETIME EXPECTANCY
One unique feature of this technology (versus aluminum
electrolytics) is how the capacitor reacts at the end of its
lifetime.
Self-extinguishing thermosetting resin (V0 = in accordance with
UL 94; I3F2 = in accordance with NF F 16-101).
STANDARDS
IEC 61071-1, IEC 61071-2: Power electronic capacitors
IEC 60384-16: Fixed metallized polypropylene
film dielectric DC capacitors
Unlike aluminum electrolytic, film capacitors do not have a
catastrophic failure mode. Film capacitors simply experience
a parametric loss of capacitance of about 2% of initial value,
with no risk of a short circuit.
IEC 60384-16-1: Fixed metallized polypropylene
film dielectric DC capacitors
The capacitor continues to be functional even after this 2%
decrease.
Assessment level E
IEC 60384-17: Fixed metallized polypropylene
film dielectric AC and pulse
capacitors
IEC 60384-17-1: Fixed metallized polypropylene
film dielectric AC and pulse
capacitors
Assessment level E
1
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