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
- 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
RoHS Compliant
Film
Specifications
Capacitance Range
Capacitance Tolerance
Rated Voltage
Operating Temperature Range with Ripple
Maximum rms Current
Maximum rms Voltage
Test Voltage between Terminal @ 25ºC
Test Voltage between Terminals & Case @ 25ºC
Life Test
Dimensions
Construction Details
Case Material
Resin Material
20 ±0.5 mm
6 ±0.5 mm
H ±0.5 mm
5 mm
M8 x 1.25
8.5 Nm Max Torque
15 mm
71.4 mm
Plastic UL94V-0
Dry Resin UL94V-0
Terminal Material Tin Plated Brass
Threaded
Stud
84.5 mm 45 ±1 mm
101 mm
M5 x 4.0 mm
2.5 Nm Max Torque
15 mm
Threaded
Insert
5.5 mm
3 Nm Mounting Torque
90°
CDE Cornell Dubilier • 1605 E. Rodney French Blvd. • New Bedford, MA 02744 • Phone: (508)996-8561 • Fax: (508)996-3830
High Current, Low Profile for Inverter Applications
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
Type 944U Polypropylene, DC Link Capacitors
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
Ratings
NOTE:
Other ratings, sizes and performance specifications are available. Contact us.
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
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
Film
* M = M8 Stud
I = M5 Insert
Typical Performance Curves
90.00
80.00
70.00
160 µF 800 Vdc Rated Ripple Current, Still Air, 5 kh Life
45 ºC
55 ºC
4
160 µF 800 Vdc ESR vs Frequency and Temperature
3.5
Rated Ripple Current (A)
65 ºC
60.00
50.00
40.00
30.00
20.00
10.00
0.00
10
100
85 ºC
75 ºC
3
ESR (mΩ)
2.5
85 ºC
2
65 ºC
45 ºC
25 ºC
0 ºC
-20 ºC
-40 ºC
1.5
1
Frequency (Hz)
1000
10000
100000
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
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. The dielectric resistance
needs to be considered for operation below 10kHz.
1. Start with the 10kHz ESR from the ratings table. If frequency is less
than 10kHz, use the following equation: ESR - 31.83/(10C) + 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. 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.
Film
The expected lifetime predictions assume no exposure to overvoltage transients.
Expected lifetime can be calculated for varying exposure to overvoltage transients.
As an illustration at 50 °C the expected lifetime is 100,000 h with the 24-hour Va ∕ Vr
profile below:
Va / Vr
1.67
1.50
1.30
1.10
1.00
Duration
100 ms
5 minutes
2.5 hours
9.6 hours
11.9 hours
For applications with more severe 24-hour profiles, contact us.
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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Authorized Distributor
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Cornell Dubilier
:
944U101K102ABI 944U101K122ACI 944U101K801AAI 944U141K102ACI 944U161K801ABI 944U221K801ACI
944U330K142AAI 944U470K122AAI 944U520K142ABI 944U660K102AAI 944U700K122ABI 944U700K142ACI
944U470K122AAM 944U101K801AAM 944U141K102ACM 944U700K122ABM 944U101K122ACM
944U660K102AAM 944U161K801ABM 944U101K102ABM 944U221K801ACM 944U330K142AAM
944U700K142ACM 944U520K142ABM
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