ALC10C331ED450 BHC COMPONENTS, ALC10C331ED450 Datasheet - Page 10

• 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

8
Rated Capacitance (C
This is the designed value of capacitance, usually specified
in micro-Farads (µF), when measured with an a.c. voltage
<0.5V at 100Hz and 20°C, with no bias voltage applied. The
value of capacitance decreases with frequency and increases
with temperature, the magnitude of variation being
dependent on the capacitor type.
Capacitance Tolerance
Due to material and manufacturing process variability a
tolerance is specified for the rated capacitance. For a
typical batch of capacitors the distribution of capacitance
values is generally within ±5% of a nominal value.
Rated Voltage (U
The rated voltage is the value of voltage that may be applied
continuously, within the operating temperature range of the
capacitor. Generally the rated voltage and category voltage
have the same value.
Surge Voltage
Unless otherwise stated in the data sheets capacitors shall
withstand 1000 cycles at upper category temperature as
described below:
Charge to surge voltage and hold for 30 seconds followed
by a no load period of 5.5 minutes with the capacitor
disconnected and allowed to discharge internally. The power
supply used shall be capable of delivering >5 A at the test
voltage.
Short duration surge voltage - certain product ranges are
able to withstand a higher surge voltage but for a shorter
period of time. Where applicable these capacitors shall
withstand 100 surges at 20°C as described below:
Charge capacitor to rated voltage then charge up to
short duration surge voltage for a period of <500 mS then
discharge completely, followed by a no load period of 5
minutes. Figures for this test, where applicable, are shown
under the range data sheets.
Transient Surge Voltage
High voltage capacitors (250V – 500V) manufactured
by BHC are capable of withstanding very high transient
surge voltages for short duration. For example, the 400V
capacitors from the ALC10 series have been successfully
tested to 600V for 500ms as an isolated condition, i.e. once
per day. Ultimately the performance of the capacitors under
this type of condition is dependent on four criteria:
 value of the voltage;
 duration;
 temperature;
 repetition rate
Given this information BHC can advise on the suitability of a
given capacitor for the application.
Dissipation Factor
The dissipation factor or tangent of the loss angle (tan δ) is a
measure of the deviation from that of an ideal capacitor, and
is related to the capacitance and e.s.r. values as follows:-
Where capacitance (C) and e.s.r. are at frequency f.
R
)
Tan δ = 2.π.f.C.esr
R
)
Voltage Proof
Values are quoted for each range in the data sheets. These
values are applicable to insulating sleeves and end discs in
good condition with no scuffs or scratches. Damage caused
by improper handling may reduce these values.
The test involves applying a high d.c. voltage, e.g. 2500V,
across the insulating sleeve of the capacitor for a period of
1 minute. During this test period there should be no sign of
breakdown or flashover.
Leakage Current
This is the residual current which continues to flow when
the capacitor has been charged up to a set voltage. At
this voltage its magnitude is determined by the thickness
(forming voltage) and degree of perfection of the dielectric
oxide and foil surface area. The value of leakage current
will continue to fall, whilst voltage is applied, until a very
low steady state value is reached. Its value will increase
both with voltage and temperature. The longer capacitors
are stored with no applied voltage, the higher the initial
leakage current. More details are given under shelf life.
Equivalent Series Resistance
The equivalent series resistance (e.s.r.) is made up of
several resistive components within the capacitor, including
electrolyte, tissue separators, foils etc. The method of
construction also plays an important role. For example,
the e.s.r. can be significantly reduced in some cases by
making multiple connections to the anode and cathode foils.
The e.s.r. is both temperature and frequency dependent,
increasing either will cause a reduction in e.s.r., as
exemplified by the graph below:
Impedance (Z)
The impedance is governed by the capacitance (C), e.s.r. and
inductance (L) of the capacitor and is given by the formula:
The impedance is dominated by the capacitive reactance
(X
at high frequencies. Series resonance occurs when X
which point Z = e.s.r.
The impedance is clearly frequency dependent and is
temperature dependent due to the capacitance and e.s.r.
terms.
C
) at low frequencies and by the inductive reactance (X
Z = esr
Where X
ESR
2
L
+ (X
= 2.π.f.L and X
L
Frequency - Hz
- X
100
C
)
2
Electrical Characteristics
C
=
1000
(2.π.f.C.)
20°C
55°C
85°C
1
10000
L
= X
L
C
)
at