ALC10C331ED450 BHC COMPONENTS, ALC10C331ED450 Datasheet - Page 11

• Manufacturer Part Number: ALC10C331ED450
• Description: CAPACITOR, 330UF 450V CAPACITOR, 330UF 450V
• Manufacturer: BHC COMPONENTS
• Series: ALC10r

Specifications of ALC10C331ED450

• Capacitance: 330UF
• Voltage Rating, Dc: 450V
• Capacitor Dielectric Type: ALUMINIUM ELECTROLYTIC
• Temp, Op. Max: 85(DEGREE C)
• Temp, Op. Min: -40(DEGREE C)
• Tolerance,: 20%
• Rohs Compliant: YES

Inductance
Some inductance is present in all wound aluminium electro-
lytic capacitors as a result of the construction of the wind-
ing and the tabbing. The value is usually not more than a
few tens of nano-henrys and is more or less constant with
changes in temperature and frequency.
Ripple Current (I
Ripple current, caused by the application of an alternating
voltage waveform, will generate heat inside the capacitor.
The power loss is given by:
P = I
Where:
P = Power loss
I
The maximum power a capacitor can handle is dependent
upon the style and surface area of the can, the thermal
dissipation factor, and the permissible core temperature rise
within the capacitor. Thus for a given capacitor a maximum
continuous ripple current rating can be established.
Capacitors have a maximum designed core temperature
which is higher than the specified maximum ambient
operating temperature for the component. At lower
ambient temperatures higher ripple currents can be applied
provided the maximum core temperature is not exceeded.
Factors are given in the data sheets. Increased ripple
currents are also possible at higher frequencies, since the
e.s.r. is lower. Heat-sinking and forced air cooling will both
aid heat transfer and thus allow higher ripple currents.
Note, some additional heat is generated by the leakage
current, but this is normally much less than that generated
by the ripple current and so can be ignored.
Since the ripple current raises the temperature of the
capacitor, it has a significant effect on the operational life
of the component. Further details are given under life-
expectancy.
Temperature Range
The maximum operating temperature or upper category
temperature is the maximum temperature at which the
capacitor is designed to operate continuously. Choice of
foils, electrolyte and encapsulation materials ultimately
determine this figure.
The lower category temperature is the lowest temperature
at which the capacitor is designed to operate continuously.
The electrolyte resistivity and viscosity both increase at
low temperatures causing loss of capacitance and increased
e.s.r.
r
= Ripple Current (Amps)
r
2
.esr (Watts)
R
)
Climatic Category
The Climatic Category, in accordance with IEC 68-1, is based
upon three groups of digits which decode as follows:
LCT
UCT
DH
Where:
LCT = Lower category temperature °C (e.g. 40 = -40°C)
UCT = Upper category temperature °C (e.g. 85 = +85°C)
DH = Damp heat test days (IEC 68)
Shelf Life
The capacitance, ESR and impedance of a capacitor will not
change significantly after extended storage periods, however
the leakage current will very slowly increase. BHC products
are particularly stable and allow a shelf life in excess of ten
years at room temperature.
The shelf life is shown in the figure below. Within region
1 the leakage current should remain within its specified
limit when measured. In region 2 the leakage current may
initially exceed the specified limit and if the measured value
is higher than twice the specified limit then re-ageing is
recommended.
Re-age Procedure
Apply the rated voltage to the capacitor at room
temperature for a period of one hour, or until the leakage
current has fallen to a steady value below the specified
limit. During re-ageing a maximum charging current of
twice the specified leakage current or 5mA (whichever is
greater) is suggested.
-15
-35
-55
85
65
45
25
5
1
Thousands of hours
Electrical Characteristics
1
10
40 / 085 / 56
100
9