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
0.25 µF to 50.0 µF
200 Vpk to 2000 Vpk
±10%
–40 ºC to +65 ºC
+80 ºC
Specifications
Complies with the EU Directive 2002/95/EC
requirement restricting the use of Lead (Pb), Mercury
(Hg), Cadmium (Cd), Hexavalent chromium (Cr(VI)),
PolyBrominated Biphenyls (PBB) and PolyBrominated
Diphenyl Ethers (PBDE).
•
Capacitance Range:
Voltage Range:
Capacitance Tolerance:
Temperature Range:
Surface Temperature:
Ratings
Cap
Catalog
Case
H
Max VA
Max
(µF) Part Number Code (In.) (65 ºC) (Arms)
200 Vpk (Paper Dielectric)
3
SCRN201R-F
A
2.13
400
60
5
SCRN202R-F
A
2.63
465
60
10 SCRN203R-F
A
3.88
625
60
15 SCRN205R-F
A
4.75
765
60
20 SCRN206R-F
B
4.25
875
60
30 SCRN208R-F
C
5.25
1200
60
40 SCRN209R-F
C
6.75
1500
60
50 SCRN210R-F
D
5.75
1590
60
400 Vpk (Film and Paper Dielectric)
2
SCRN211R-F
A
2.63
790
60
3
SCRN212R-F
A
2.63
970
60
5
SCRN213R-F
A
3.88
1130
60
10 SCRN214R-F
B
4.75
1930
60
15 SCRN215R-F
C
4.75
2240
60
20 SCRN216R-F
C
6.25
2800
60
30 SCRN217R-F
D
6.75
3720
60
40 SCRN218R-F
D
8.00
4330
60
50 SCRN219R-F
E
6.25
6050
100
600 Vpk (Film and Paper Dielectric)
2
SCRN220R-F
A
2.63
815
60
3
SCRN221R-F
A
3.13
1200
60
5
SCRN222R-F
A
4.25
1420
60
10 SCRN224R-F
C
4.25
2040
60
15 SCRN226R-F
C
5.75
2800
60
20 SCRN227R-F
D
5.75
3260
60
25 SCRN229R-F
D
6.75
3720
60
30 SCRN230R-F
D
8.00
4330
60
40 SCRN231R-F
E
6.25
6060
100
50 SCRN232R-F
E
7.25
6850
100
Cap
Catalog
Case
H
Max VA Max
(µF) Part Number Code (In.) (65 ºC) (Arms)
600 Vpk (Film Dielectric for Low-loss)
1
SCRN262R-F
A
2.38
2200
60
2
SCRN263R-F
A
2.38
2060
60
3
SCRN264R-F
A
3.88
3190
60
5
SCRN265R-F
A
4.25
4380
60
10 SCRN266R-F
C
4.25
6060
60
1000 Vpk (Film and Paper Dielectric)
1
SCRN233R-F
A
2.13
790
60
2
SCRN234R-F
A
3.13
1070
60
3
SCRN235R-F
A
3.88
1455
60
5
SCRN236R-F
B
4.25
1785
60
10 SCRN237R-F
C
5.75
2570
60
15 SCRN238R-F
D
5.75
3170
60
20 SCRN239R-F
E
5.13
5200
100
1500 Vpk (Film and Paper Dielectric)
.5 SCRN240R-F
A
2.13
990
60
1
SCRN241R-F
A
2.88
1240
60
2
SCRN242R-F
B
3.50
1890
60
3
SCRN243R-F
C
4.25
2550
60
5
SCRN244R-F
C
5.75
3250
60
10 SCRN245R-F
E
5.13
6500
100
2000 Vpk (Film and Paper Dielectric)
.25 SCRN246R-F
A
2.13
990
60
.33 SCRN257R-F
A
2.13
1000
60
.5 SCRN247R-F
A
2.63
1180
60
1
SCRN248R-F
A
3.13
1300
60
2
SCRN249R-F
B
4.25
2230
60
3
SCRN251R-F
C
4.75
2800
60
5
SCRN253R-F
D
5.75
4020
60
10 SCRN256R-F
F
5.75
7600
100
CDE Cornell Dubilier • 1605 E. Rodney French Blvd. • New Bedford, MA 02744 • Phone: (508)996-8561 • Fax: (508)996-3830 • www.cde.com
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.
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
Using Volt-Ampere Ratings
T
he 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:
V peak
ΔV
Voltage
Current
I peak
Figure 1
Polypropylene
Paper
PP Film/Paper
Figure 2
Irms = C∆V/[0.64(tT) ] = Ipeak(t/T)
0.5
0.5
where (f) is repetition frequency in Hz, C is nominal
capacitance in µF, ½V the peak-to-peak squarewave amplitude
in volts, (t) is the pulse width in µs and T is the pulse period
in µs.
T
he peak current for the square wave voltage is:
Ipeak = C∆V/0.64t
Figure 3
CDE Cornell Dubilier • 1605 E. Rodney French Blvd. • New Bedford, MA 02744 • Phone: (508)996-8561 • Fax: (508)996-3830 • www.cde.com
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