Type 944U
Polypropylene Film Capacitors for DC Filtering
Metallized Polypropylene Dielectric
Type 944U is specifically designed for use in medium power DC fil-
tering applications. The low inductance internal construction utilizes
low loss metallized polypropylene for high ripple current capability.
Male or female terminal options offer design flexibility in a rugged
UL 94VO rated flame retardant plastic case and resin fill.
Applications
Inverters: DC Link
DC Output Filter
Specifications
Capacitance Range:
Voltage Range:
Capacitance Tolerance:
Operating Temperature Range:
Dielectric Withstand:
33 µF to 220 µF
800 Vdc to 1400 Vdc
±10% standard
–40 ºC to +85ºC
150% Rated Vdc 10s - Between Terminals
4000 Vac 60s - Terminals to Case
Complies with the EU Directive
2002/95/EC requirement restrict-
ing the use of Lead (Pb), Mercury
(Hg), Cadmium (Cd), Hexava-
lent chromium (Cr(VI)), PolyBro-
minated Biphenyls (PBB) and
PolyBrominated Diphenyl Ethers
(PBDE).
Ratings
Catalog
Part Number
944U101K801AA*
944U161K801AB*
944U221K801AC*
944U660K102AA*
944U101K102AB*
944U141K102AC*
944U470K122AA*
944U700K122AB*
944U101K122AC*
944U330K142AA*
944U520K142AB*
944U700K142AC*
Cap
(µF)
100
160
220
66
100
140
47
70
100
33
52
70
Rated
H
Voltage Height
(Vdc) (mm)
800
800
800
1000
1000
1000
1200
1200
1200
1400
1400
1400
40
51
64
40
51
64
40
51
64
40
51
64
H
Height
(in)
1.67
2.01
2.52
1.67
2.01
2.57
1.67
2.01
2.57
1.67
2.01
2.57
Max ESR
10kHz
(mΩ)
0.5
0.8
1.0
0.6
0.8
1.0
0.7
1.0
1.3
0.8
1.1
1.4
Typical
ESL
(nH)
20
30
40
20
30
40
20
30
40
20
30
40
Max Irms
55ºC
(A)
74
73
72
70
68
65
67
65
64
64
60
59
Thermal Resistance
Θcc
(ºC/W)
2.8
3.0
3.1
2.8
3.0
3.1
2.8
3.0
3.1
2.8
3.0
3.1
Θca
(ºC/W)
5.2
4.5
4.0
5.2
4.5
4.0
5.2
4.5
4.0
5.2
4.5
4.0
* M = M8 Stud
I = M5 Insert
Additional values available upon request.
CDE Cornell Dubilier
•
1605 E. Rodney French Blvd.
•
New Bedford, MA 02740
•
Phone: (508)996-8561
•
Fax: (508)996-3830 www.cde.com
Type 944U
Polypropylene Film Capacitors for DC Filtering
Outline Drawing
Dimensions: Millimeters (Inches)
H dimension in Ratings Table
I Suffix
M Suffix
Part Numbering System
944U
Type
944U
101
Capacitance
101 = 100 µF
700 = 70 µF
470 = 47 µF
K
Tolerance
K = ±10%
801
Voltage
801 = 800 Vdc
102 = 1000 Vdc
122 = 1200 Vdc
142 = 1400 Vdc
Tolerance ±0.5mm (±0.019”), otherwise specified
A
A
M
Terminal
M = M8 Thd Stud
I = M5 Thd Insert
Diameter D (mm) Height H (mm)
A = 84.5
A = 40
B = 51
C = 64
CDE Cornell Dubilier
•
1605 E. Rodney French Blvd.
•
New Bedford, MA 02740
•
Phone: (508)996-8561
•
Fax: (508)996-3830 www.cde.com
Type 944U
Polypropylene Film Capacitors for DC Filtering
Expected Lifetime Predictions
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
θca.
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
θca
= 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.
Permissible Voltage Surge Duty for 100,000 Hour
Life Expectancy at 50 ºC Core Temperature
Factor
1.67x
1.50x
1.30x
1.10x
1.00x
Duration
Frequency
t≤ 100 ms
1x/day
t≤ 5 minutes
1x/day
t≤ 2.5 hours
1x/day
t≤ 9.6 hours
1x/day
balance (11.9 h)
1x/day
CDE Cornell Dubilier
•
1605 E. Rodney French Blvd.
•
New Bedford, MA 02740
•
Phone: (508)996-8561
•
Fax: (508)996-3830 www.cde.com
Type 944U
Polypropylene Film Capacitors for DC Filtering
Typical Performance Curves
4
160µF 800Vdc ESR vs Frequency and Temperature
3.5
3
ESR (mΩ)
2.5
85ºC
2
65ºC
45ºC
25ºC
0ºC
1.5
-20ºC
-40ºC
1
100
1000
Frequency (Hz)
10000
100000
160µF 800Vdc Rated Ripple Current, Still Air, 5kh Life
90.00
45ºC
80.00
55ºC
70.00
65ºC
Rated Ripple Current (A)
60.00
50.00
75ºC
40.00
30.00
85ºC
20.00
10.00
0.00
10
100
1000
Frequency (Hz)
10000
100000
CDE Cornell Dubilier
•
1605 E. Rodney French Blvd.
•
New Bedford, MA 02740
•
Phone: (508)996-8561
•
Fax: (508)996-3830 www.cde.com
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