Type SCR, Commutating Capacitors
Type SCRN Film-Paper/Extended Foil Commutating Capacitor
Type SCRN capacitors are for SCR (silicon controlled rectifier)
commutating applications that require high peak and rms current
capability. These capacitors are ideal for other high frequency and
pulsed applications. The SCRN is supplied in oval or rectangular metal
cases with 1/4 x 20 threaded stud and insulated terminals to withstand
high current and high peak voltages.
Highlights
- Conforms to EIA RS401 for power semiconductor applications
- Non ferrous covers available for high frequency applications
- 40,000 hours life at full rated voltage and temperature
- High voltage, high current and high frequency
- Custom designs available
0.25 µF to 50.0 µF
±10%
200 Vpk to 2000 Vpk
–40 ºC to +80 ºC
Case codes: A, B, C, D = 60 Irms max. E and F = 100 Irms max.
see application guide
DC voltage 2 x rated peak for 60 s
2 x reference AC voltage +1000 Vac for 60 s
EIA RS401
40,000 h life at full rated voltage, current, case temperature and VA
Minimum of 95% survival
EIA RS401
Rohs Compliant
Specifications
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
Life Expectancy
Reliability
Standards
Dimensions
Case Material
B
±0.06”
±0.03"
B
±0.03"
Construction Details
Tin Plated Steel or Aluminum
Biodegradeable, Environmentally
Compatible Fluid
Electro-tin plated copper stud and
molded pillar insulator
Encapsulation
Terminal Material
A
±0.06”
±0.03"
F
±0.03"
¼ - 20 THD
2 places
C
±0.06"
A
±0.03"
F
±0.03"
¼ - 20 THD
2 places
C
±0.06"
D
±0.06"
D
±0.06"
H
+0.12”
±0.06"
-0.06”
Case
H
±0.06"
Dimensions Inches
A
B
C
D
F
H
see table
see table
see table
see table
see table
see table
Figure
Fig. 1
Fig. 1
Fig. 1
Fig. 1
Fig. 2
Fig. 2
1.31 2.16 0.56 1.19 0.81
1.56 2.69 0.50 1.13 1.25
1.91 2.91 0.50 1.13 1.38
1.97 3.66 0.50 1.13 1.38
2.84 4.56 0.50 1.13 2.00
3.75 4.56 0.56 1.19 2.00
Code
A
B
C
D
E
F
Figure 1
Figure 2
CDE Cornell Dubilier • 1605 E. Rodney French Blvd. • New Bedford, MA 02744 • Phone: (508)996-8561 • Fax: (508)996-3830
Type SCR, Commutating Capacitors
Ratings
Cap
(µF)
3
5
10
15
20
30
40
50
2
3
5
10
15
20
30
40
50
2
3
5
10
15
20
25
30
40
50
Catalog
Part Number
SCRN201R-F
SCRN202R-F
SCRN203R-F
SCRN205R-F
SCRN206R-F
SCRN208R-F
SCRN209R-F
SCRN210R-F
SCRN211R-F
SCRN212R-F
SCRN213R-F
SCRN214R-F
SCRN215R-F
SCRN216R-F
SCRN217R-F
SCRN218R-F
SCRN219R-F
SCRN220R-F
SCRN221R-F
SCRN222R-F
SCRN224R-F
SCRN226R-F
SCRN227R-F
SCRN229R-F
SCRN230R-F
SCRN231R-F
SCRN232R-F
Case
H
Max VA
Max
Type SCRN Film-Paper/Extended Foil Commutating Capacitor
Cap
(µF)
1
2
3
5
10
1
2
3
5
10
15
20
.5
1
2
3
5
10
.25
.33
.5
1
2
3
5
10
Catalog
Part Number
SCRN262R-F
SCRN263R-F
SCRN264R-F
SCRN265R-F
SCRN266R-F
SCRN233R-F
SCRN234R-F
SCRN235R-F
SCRN236R-F
SCRN237R-F
SCRN238R-F
SCRN239R-F
SCRN240R-F
SCRN241R-F
SCRN242R-F
SCRN243R-F
SCRN244R-F
SCRN245R-F
SCRN246R-F
SCRN257R-F
SCRN247R-F
SCRN248R-F
SCRN249R-F
SCRN251R-F
SCRN253R-F
SCRN256R-F
Case
H
Max VA
Max
Code (Inches)
A
A
A
A
B
C
C
D
A
A
A
B
C
C
D
D
E
A
A
A
C
C
D
D
D
E
E
2.13
2.63
3.88
4.75
4.25
5.25
6.75
5.75
2.63
2.63
3.88
4.75
4.75
6.25
6.75
8.00
6.25
2.63
3.13
4.25
4.25
5.75
5.75
6.75
8.00
6.25
7.25
(65 ºC) (Arms)
400
465
625
765
875
1200
1500
1590
790
970
1130
1930
2240
2800
3720
4330
6050
815
1200
1420
2040
2800
3260
3720
4330
6060
6850
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
100
60
60
60
60
60
60
60
60
100
100
Code (Inches)
A
A
A
A
C
A
A
A
B
C
D
E
A
A
B
C
C
E
A
A
A
A
B
C
D
F
2.38
2.38
3.88
4.25
4.25
2.13
3.13
3.88
4.25
5.75
5.75
5.13
2.13
2.88
3.50
4.25
5.75
5.13
2.13
2.13
2.63
3.13
4.25
4.75
5.75
5.75
(65 ºC) (Arms)
2200
2060
3190
4380
6060
790
1070
1455
1785
2570
3170
5200
990
1240
1890
2550
3250
6500
990
1000
1180
1300
2230
2800
4020
7600
60
60
60
60
60
60
60
60
60
60
60
100
60
60
60
60
60
100
60
60
60
60
60
60
60
100
200 Vpk (Paper Dielectric)
600 Vpk (Film Dielectric for Low-loss)
1000 Vpk (Film and Paper Dielectric)
400 Vpk (Film and Paper Dielectric)
1500 Vpk (Film and Paper Dielectric)
600 Vpk (Film and Paper Dielectric)
2000 Vpk (Film and Paper Dielectric)
CDE Cornell Dubilier • 1605 E. Rodney French Blvd. • New Bedford, MA 02744 • Phone: (508)996-8561 • Fax: (508)996-3830
Type SCR, Commutating Capacitors
How to Choose a Commutating Capacitor
1
. From circuit analysis or measurement, determine application values
for these six parameters:
Nominal capacitance in µF
Current pulse width in µs
Current pulse period in µs
Maximum peak voltage
Continuous AC voltage in Vrms
Maximum volt-amps (VA)
2. Choose a capacitor from the ratings table of the desired nominal
capacitance with a peak voltage rating no less than your maximum
peak voltage.
Type SCRN Film-Paper/Extended Foil Commutating Capacitor
Application Guide
3. Check that your application’s rms current is no more than the capacitor’s
Max. Amps RMS. You can calculate the current from your Vrms using the
equations in the following section.
4. Check that your application’s volt-amperes is not more than the
capacitor’s VA capability. The VA capability is the max VA rating times
the Volt-Ampere multiplier from Figure 2 (Current Pulse Width) and that
times the Volt-Ampere Multiplier from Figure 3 (Ambient Temperature).
See the following section for more on using volt-ampere multipliers.
If you need a greater VA capability, repeat these steps for a higher peak
voltage capacitor or consider connecting units in parallel to divide the
VA required. For up to peak voltage of 600 V, you may also consider
polypropylene film dielectric units, Catalog Numbers SCRN262R through
SCRN266R, with higher VA capability.
Pulse Wave Applications
V peak
Voltage
ΔV
T
Using Volt-Ampere Ratings
The capacitors maximum VA rating is the maximum product of the
sine wave voltage and current that may be applied at 65 ºC without
overheating the capacitor and reducing its expected life. For other
temperatures and pulsed current, use the multipliers of Figures 2 and 3
to derate the Max VA rating.
The Max Amps RMS rating is set by the capability of the capacitor
terminals. Exceeding this limit can damage the terminals and cause
capacitor failure.
Calculate the capacitor’s actual VA load as the product of the rms voltage
across the capacitor and the rms current through the capacitor. To
calculate rms current for an applied sine wave or squarewave voltage,
use these equations.
For a sinewave voltage the current is:
Irms = 2π fCVrmsX10
-6
and for a squarewave the current is:
Irms = C∆V/[0.64(tT)
0.5
] = Ipeak(t/T)
0.5
where (f ) is repetition frequency in Hz, C is nominal capacitance in µF, ∆V
the peak-to-peak squarewave amplitude in volts, (t) is the pulse width in
µs and T is the pulse period in µs.
The peak current for the square wave voltage is:
Ipeak = C∆V/0.64t
Current
I peak
Figure 1
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
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cated in such warnings, cautions and notes, or that other safety measures may not be required.
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