Type 944U Polypropylene, DC Link Capacitors
High Current, Low Profile for Inverter Applications
Type 944U is specifically designed for use in high power DC filtering
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. High
current ratings and robust mounting flanges make the 944U suited
for inverter applications in electric vehicle power inverters, wind
power inverters and motor drives.
Highlights
Specifications
Film
Capacitance Range
Capacitance Tolerance
Rated Voltage
Operating Temperature Range
Maximum rms Current
Maximum rms Voltage
Test Voltage between Terminal @ 25ºC
Test Voltage between Terminals & Case @ 25ºC
Life Test
- Low Inductance
- Low Profile
- Low ESR
- High Ripple Current
- High Voltage Ratings
33 to 220 µF
±10% standard
800 to 1400 Vdc
-40 ºC to 85 ºC
74A @ 55 ºC
230 Vac
150% rated DC voltage for 10 s
4 kVac @ 50/60 Hz for 60 s
5000 h @ 85 ºC, rated voltage
Regulatory Information
Dimensions
20 ±0.5 mm
M8 x 20mm
Max Torque 8.5Nm
Construction Details
Case Material
Resin Material
Plastic UL94V-0
Dry Resin UL94V-0
H ±0.5 mm
Terminal Material Tin Plated Brass
5 mm
M8 Stud
Terminal
84.5 ±0.5 mm
45 ±1 mm
UL Recognized E128034
construction only - unprotected
101 mm
15 mm
6 ±0.5 mm
6 ±0.5 mm
5.5
Max Torque 3Nm
5 mm
M5 Insert
Terminal
84.5 ±0.5 mm
71.4 mm
45 ±1 mm
M5 x 7.5mm
Max Torque 2.5Nm
90°
H ±0.5 mm
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
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 02744 • Phone: (508)996-8561 • Fax: (508)996-3830
Type 944U Polypropylene, DC Link Capacitors
High Current, Low Profile for Inverter Applications
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
Voltage
(Vdc)
800
800
800
1000
1000
1000
1200
1200
1200
1400
1400
1400
H
Height
mm
40
51
64
40
51
64
40
51
64
40
51
64
Typical 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
NOTE:
Other ratings, sizes and performance specifications are available. Contact us.
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
Film
* M = M8 Stud
I = M5 Insert
160 µF 800 Vdc Rated Ripple Current, Still Air, 5kh Life
90
Rated Ripple Current (A)
80
70
60
50
40
30
20
10
0
10
100
1000
Frequency (Hz)
10000
100000
85ºC
45ºC
55ºC
Typical Performance Curves
65ºC
75ºC
160 µF 800 Vdc ESR vs Frequency and Temperature
3
2.5
ESR (mΩ)
2
1.5
85ºC
65ºC
45ºC
25ºC
0ºC
-20ºC
-40ºC
1
0.5
100
1000
Frequency (Hz)
10000
100000
CDE Cornell Dubilier • 1605 E. Rodney French Blvd. • New Bedford, MA 02744 • Phone: (508)996-8561 • Fax: (508)996-3830
Type 944U Polypropylene, DC Link Capacitors
High Current, Low Profile for Inverter Applications
Expected Lifetime Predictions
Capacitance: C (µF)
Equivalent Series Resistance: ESR (mΩ)
Frequency: f (kHz)
Ripple Current: I (A
rms
)
Ambient Temperature: T
A
(°C)
Core Temperature: T
C
(°C)
Total Thermal Resistance: Θ (°C/W)
Thermal Resistance case-to-ambient: Θ
CA
(°C/W)
Thermal Resistance core-to-case: Θ
CC
(°C/W)
Airflow Speed: v (m/s)
Applied Voltage: V
A
(V
DC
)
Rated Voltage: V
R
(V
DC
)
Determine ESR at Operating Frequency
Use the 10 kHz ESR from the ratings tables.
For operation below 10 kHz, the ESR will need to be adjusted using the following
equation: ESR - 31.83/(10C) + 31.83/(fC).
Determine Thermal Resistance at Operating Frequency and Air Flow
Compute Θ = Θ
CC
+ Θ
CA
. In the ratings tables, Θ
CA
is for still air. For v = 0 to 5 m/s,
multiply Θ
CA
by [(5 + 17.6(0.1
0.66
)) / (5 + 17.6(v + 0.1)
0.66
)]
Determine Expected Lifetime
Look up Expected Lifetime on the graph using V
A
/V
R
and T
C
= T
A
+ I
2
(ESR/1000) Θ
The maximum allowed temperature rise is 40 °C and the maximum allowed core
temperature is 95 °C.
Film
Expected Lifetime vs Hot Spot Temperature and Applied DC Voltage
1.6
1.5
1.4
50ºC
1.3
Va / Vr
60ºC
1.2
70ºC
1.1
1
85ºC
0.9
0.8
1000
10000
100000
1000000
Expected Lifetime (h)
CDE Cornell Dubilier • 1605 E. Rodney French Blvd. • New Bedford, MA 02744 • Phone: (508)996-8561 • Fax: (508)996-3830
Notice and Disclaimer:
All product drawings, descriptions, specifications, statements, information and
data (collectively, the “Information”) in this datasheet or other publication are subject to change. The
customer is responsible for checking, confirming and verifying the extent to which the Information con-
tained in this datasheet or other publication is applicable to an order at the time the order is placed. All
Information given herein is believed to be accurate and reliable, but it is presented without any guaran-
tee, warranty, representation or responsibility of any kind, expressed or implied. Statements of suitability
for certain applications are based on the knowledge that the Cornell Dubilier company providing such
statements (“Cornell Dubilier”) has of operating conditions that such Cornell Dubilier company regards
as typical for such applications, but are not intended to constitute any guarantee, warranty or representa-
tion regarding any such matter – and Cornell Dubilier specifically and expressly disclaims any guarantee,
warranty or representation concerning the suitability for a specific customer application, use, storage,
transportation, or operating environment. The Information is intended for use only by customers who
have the requisite experience and capability to determine the correct products for their application. Any
technical advice inferred from this Information or otherwise provided by Cornell Dubilier with reference
to the use of any Cornell Dubilier products is given gratis (unless otherwise specified by Cornell Dubilier),
and Cornell Dubilier assumes no obligation or liability for the advice given or results obtained. Although
Cornell Dubilier strives to apply the most stringent quality and safety standards regarding the design
and manufacturing of its products, in light of the current state of the art, isolated component failures may
still occur. Accordingly, customer applications which require a high degree of reliability or safety should
employ suitable designs or other safeguards (such as installation of protective circuitry or redundancies
or other appropriate protective measures) in order to ensure that the failure of an electrical component
does not result in a risk of personal injury or property damage. Although all product-related warnings,
cautions and notes must be observed, the customer should not assume that all safety measures are indi-
cated in such warnings, cautions and notes, or that other safety measures may not be required.
Film
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