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944U700K142ABI Datasheet(PDF) 3 Page - Cornell Dubilier Electronics

Part # 944U700K142ABI
Description  Polypropylene Film Capacitors for DC Filtering
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Manufacturer  CDE [Cornell Dubilier Electronics]
Direct Link  http://www.cde.com
Logo CDE - Cornell Dubilier Electronics

944U700K142ABI Datasheet(HTML) 3 Page - Cornell Dubilier Electronics

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CDE Cornell Dubilier
1605 E. Rodney French Blvd.New Bedford, MA 02740Phone: (508)996-8561Fax: (508)996-3830 www.cde.com
Type 944U Polypropylene Film Capacitors for DC Filtering
To use the Expected Lifetime curves calculate Va ⁄Vr and core
temperature T. Start by estimating:
Applied dc voltage Va
Ripple Current I
Ripple Frequency f
Ambient Temperature Ta
Airflow speed v
Units:
A=m²
T, Ta & Tc=°C
C=μF
θ
, θca & θcc =°C/W
ESR=mΩ
v=m/s
f=kHz
Va &Vr=Vdc
I=A
NOTE: The temperature rise in the 944U is I²(ESR) times the
thermal resistance θ. The ESR is mainly the metal resistance;
the metal resistance is the 10 kHz ESR. For operation below
10kHz add the dielectric resistance. It is the dielectric
dissipation factor—no more than 0.0002—times the capacitive
reactance, i.e., 0.0002 ⁄(2πfC).
That’s equal to 31.83 ⁄(fC).
1. Start with the 10 kHz ESR from the Ratings table. If frequency
is less than 10 kHz, add 31.83 ⁄(fC).
2. Compute total thermal resistance θ as the sum of core-to-case
thermal resistance θcc and case-to-ambient thermal resistance
θ
ca. Both are in the Ratings table but θca is for still air and θcc
is for 10 kHz or less. For frequency > 10 kHz multiply θcc by
[1+(f –10)/100], e.g., for 75 kHz multiply θcc by 1.65. For moving
air use the capacitor surface area A and airflow speed v to calculate
θ
ca = 1 ⁄[A(5+17.5(v+0.1)0.66)].
3. Compute Va ⁄Vr and the core temperature T.
T = Ta + I²(ESR)θ
4. Look up estimated lifetime from the Expected Lifetime curves.
5. If you want a longer expected lifetime, choose a capacitor with
higher voltage rating or consider using multiple capacitors in
parallel to share the ripple current.
Expected Lifetime Predictions
Permissible Voltage Surge Duty for 100,000 Hour
Life Expectancy at 50 ºC Core Temperature
Factor
Duration
Frequency
1.67x
t≤ 100 ms
1x/day
1.50x
t≤ 5 minutes
1x/day
1.30x
t≤ 2.5 hours
1x/day
1.10x
t≤ 9.6 hours
1x/day
1.00x
balance (11.9 h)
1x/day


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