100mm
100mm
100mm
100mm
100mm THYRIST
THYRIST
THYRIST
THYRIST
THYRISTOR PRESSP
OR PRESSP
OR PRESSP
OR PRESSP
OR PRESSPA K
A K
A K
A K
A K
3200V / 3800A
3200V / 3800A
3200V / 3800A
3200V / 3800A
3200V / 3800A
C795
C795
C795
C795
C795
175 GREAT VALLEY PKWY. MALVERN, PA 19355
U S A
Type C795 thyristor is suitable for phase control applications such as high voltage valves used on static Var
compensators and thyristor controlled series compensation. It is especially optimized to handle frequently applied heavy
surge currents as needed for pulse power circuits.The silicon junction is manufactured by the proven multi-diffusion
process and is suppled in an industry accepted disc-type package, suitable for mounting directly to heat dissipators using
commercially available mechanical clamping hardware.
ON-STATE CHARACTERISTIC
ON-STATE CHARACTERISTIC
ON-STATE CHARACTERISTIC
ON-STATE CHARACTERISTIC
ON-STATE CHARACTERISTIC
0
1
2
3
4
5
6
7
8
9
10
1000
10000
100000
On-State Voltage, Vtm (V)
On-State Current, Itm (A)
On-State Current, Itm (A)
92J:
Current Pulses (8ms)
Process Maximum
Tcase = 25 & 125 degC
25 C
125 C
REPETITIVE PEAK REVERSE
AND OFF-STATE BLOCKING
V O L T A G E
T
J
= 0 to 125
o
C
M O D E L
V
D R M
V
R R M
(volts)
(volts)
C795CB
3200
3200
C795CA
3100
3100
C795CP
3000
3000
C795LT
2900
2900
C795LN
2800
2800
8/22/95
ELECTRICAL
CREEPAGE / STRIKE
1.6 / 1.0 in
40.6 / 25.4 mm
CLAMPING FORCE
(range)
17000-19000 lb.
initial Tj = 125
o
C
B
B
A
2 0 5
D
CL
CL
J
A
A
A
A
A
= 5.65 in (143.5 mm)
= 5.65 in (143.5 mm)
= 5.65 in (143.5 mm)
= 5.65 in (143.5 mm)
= 5.65 in (143.5 mm)
B
B
B
B
B
=3.92 in (99.4 mm)
=3.92 in (99.4 mm)
=3.92 in (99.4 mm)
=3.92 in (99.4 mm)
=3.92 in (99.4 mm)
D=1.45 in (36.8 mm)
D=1.45 in (36.8 mm)
D=1.45 in (36.8 mm)
D=1.45 in (36.8 mm)
D=1.45 in (36.8 mm)
0.001
0.01
0.1
1
10
Zthj-case (degC/watt)
Power On-time (seconds)
Power On-time (seconds)
o1a:t305tau
.0001
.001
.01
Rthj-c=.005 degC/W
add .002 for
case to sink
C795 /
C795 /
C795 /
C795 /
C795 / T305
T305
T305
T305
T305
Repetitive peak off-
Repetitive peak off-
Repetitive peak off-
Repetitive peak off-
Repetitive peak off-
V
V
V
V
V
D R M
D R M
D R M
D R M
D R M
T
T
T
T
T
J
J
J
J
J
=0
=0
=0
=0
=0
up to
up to
up to
up to
up to
V
V
V
V
V
state & reverse volts
state & reverse volts
state & reverse volts
state & reverse volts
state & reverse volts
V
V
V
V
V
R R M
R R M
R R M
R R M
R R M
to 125
to 125
to 125
to 125
to 125
o
o
o
o
o
C
C
C
C
C
3200
3200
3200
3200
3200
Repetitive peak off-
Repetitive peak off-
Repetitive peak off-
Repetitive peak off-
Repetitive peak off-
I
I
I
I
I
D R M
D R M
D R M
D R M
D R M
T
T
T
T
T
J
J
J
J
J
=0
=0
=0
=0
=0
300
300
300
300
300
m a
m a
m a
m a
m a
state & reverse current
state & reverse current
state & reverse current
state & reverse current
state & reverse current I
I
I
I
I
R R M
R R M
R R M
R R M
R R M
to 125
to 125
to 125
to 125
to 125
o
o
o
o
o
C
C
C
C
C
300
300
300
300
300
Average on-state
Average on-state
Average on-state
Average on-state
Average on-state
I
I
I
I
I
T(AV)
T(AV)
T(AV)
T(AV)
T(AV)
T
T
T
T
T
case
case
case
case
case
=
=
=
=
=
3800
3800
3800
3800
3800
A
A
A
A
A
current
current
current
current
current
70
70
70
70
70
o
o
o
o
o
C
C
C
C
C
Peak half-cycle
Peak half-cycle
Peak half-cycle
Peak half-cycle
Peak half-cycle
I
I
I
I
I
T S M
T S M
T S M
T S M
T S M
8.3 ms
8.3 ms
8.3 ms
8.3 ms
8.3 ms
60
60
60
60
60
kA
kA
kA
kA
kA
non-rep surge current
non-rep surge current
non-rep surge current
non-rep surge current
non-rep surge current
2.0 ms
2.0 ms
2.0 ms
2.0 ms
2.0 ms
100
100
100
100
100
T
T
T
T
T
J
J
J
J
J
=100
=100
=100
=100
=100
o
o
o
o
o
C
C
C
C
C
On-state voltage
On-state voltage
On-state voltage
On-state voltage
On-state voltage
V
V
V
V
V
T M
T M
T M
T M
T M
I
I
I
I
I
T
T
T
T
T
=4000A
=4000A
=4000A
=4000A
=4000A
1.50
1.50
1.50
1.50
1.50
V
V
V
V
V
t
t
t
t
t
P
P
P
P
P
=8.3ms
=8.3ms
=8.3ms
=8.3ms
=8.3ms
T
T
T
T
T
J
J
J
J
J
=125
=125
=125
=125
=125
o
o
o
o
o
C
C
C
C
C
Critical rate of rise
Critical rate of rise
Critical rate of rise
Critical rate of rise
Critical rate of rise
di/dt
di/dt
di/dt
di/dt
di/dt
T
T
T
T
T
J
J
J
J
J
=125
=125
=125
=125
=125
o
o
o
o
o
C
C
C
C
C
100
100
100
100
100
A/us
A/us
A/us
A/us
A/us
of on-state current
of on-state current
of on-state current
of on-state current
of on-state current
rep
rep
rep
rep
rep
60 Hz
60 Hz
60 Hz
60 Hz
60 Hz
Critical rate of rise
Critical rate of rise
Critical rate of rise
Critical rate of rise
Critical rate of rise
dv/dt
dv/dt
dv/dt
dv/dt
dv/dt
T
T
T
T
T
J
J
J
J
J
=125
=125
=125
=125
=125
o
o
o
o
o
C
C
C
C
C
500
500
500
500
500
V/us
V/us
V/us
V/us
V/us
of off-state voltage
of off-state voltage
of off-state voltage
of off-state voltage
of off-state voltage
V
V
V
V
V
D
D
D
D
D
=. 80% V
=. 80% V
=. 80% V
=. 80% V
=. 80% V
D R M
D R M
D R M
D R M
D R M
Recovery current
Recovery current
Recovery current
Recovery current
Recovery current
I
I
I
I
I
R M
R M
R M
R M
R M
T
T
T
T
T
J
J
J
J
J
=105
=105
=105
=105
=105
o
o
o
o
o
C
C
C
C
C
A
A
A
A
A
2 A/us max.
2 A/us max.
2 A/us max.
2 A/us max.
2 A/us max.
85
85
85
85
85
min.
min.
min.
min.
min.
55
55
55
55
55
Turn-on delay
Turn-on delay
Turn-on delay
Turn-on delay
Turn-on delay
t
t
t
t
t
d
d
d
d
d
Vd=.5V
Vd=.5V
Vd=.5V
Vd=.5V
Vd=.5V
D R M
D R M
D R M
D R M
D R M
3
3
3
3
3
us
us
us
us
us
Turn-off time
Turn-off time
Turn-off time
Turn-off time
Turn-off time
T
T
T
T
T
off
off
off
off
off
5A/us,-100V
5A/us,-100V
5A/us,-100V
5A/us,-100V
5A/us,-100V
400
400
400
400
400
us
us
us
us
us
20V/us to 2000V
20V/us to 2000V
20V/us to 2000V
20V/us to 2000V
20V/us to 2000V
Thermal resistance
Thermal resistance
Thermal resistance
Thermal resistance
Thermal resistance
R
R
R
R
R
thJC
thJC
thJC
thJC
thJC
.005
.005
.005
.005
.005
c/w
c/w
c/w
c/w
c/w
Externally applied
Externally applied
Externally applied
Externally applied
Externally applied
F
F
F
F
F
17000
17000
17000
17000
17000
lbs.
lbs.
lbs.
lbs.
lbs.
clamping force
clamping force
clamping force
clamping force
clamping force
-19000
-19000
-19000
-19000
-19000
LIMITING CHARACTERISTICS AND RATINGS
LIMITING CHARACTERISTICS AND RATINGS
LIMITING CHARACTERISTICS AND RATINGS
LIMITING CHARACTERISTICS AND RATINGS
LIMITING CHARACTERISTICS AND RATINGS
0
10
20
30
40
50
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
Gate Characteristics and
Gate Supply Requirements
Instantaneous Voltage (V)
Instantaneous Current (A)
Instantaneous Current (A)
92J:
dynamic @ 105 C
static (dc) @ 25 C
optional
load lines
THYRISTOR GATE IMPEDANCE
Enhanced by fast rising gate voltage,increasing anode bias
and junction temperature.It is at a minimum for dc current,
zero anode bias and low temperature.
GATE SUPPLY
At least 30V/10 ohm is necessary to support the di/dt rating
and life expectancy. The short circuit current risetime
should be nominally 0.5us and the duration longer than the
expected delay time for all magnitudes of anode
bias. Practically 10-30us is recommended followed by a back
porch of 750ma if needed to sustain conduction.
MINIMUM ACCEPTABLE GATE CURRENT
The intersection of the load line and gate impedance
characteristic indicates the minimum value of actual current
needed during the delay time interval to support di/dt.A
different load line meeting this criterion may be used.
MAXIMUM GATE RATINGS
Peak gate power,Pgm(100us) = 300 W
Average gate power,Pg(av) = 50W
Peak gate current,Igfm = 25 A
Peak reverse voltage,Vgrm = 25 V
sh2 8/22/95
di
dt
di
dt
I
RM(REC)
R
(REC)
t
10
100
1000
1
10
100
Peak Recovery Current Relationship
with Commutating di/dt
Peak Recovery Current, Irm, (A)
Commutating di/dt, (A/us)
Commutating di/dt, (A/us)
2000
25 degC
105 degC
0
500
1000
1500
2000
2500
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
FULL CYCLE AVERAGE POWER DISSIPATION
Sine Wave - includes spread loss
as function of conduction angle
Average Power, Pavg (W)
Peak Current, It (kA)
Peak Current, It (kA)
92J:
conduction angle (degrees)
180
150
120
90
60
30
conduction angle
0
250
500
750
1000
1250
1500
1750
2000
2250
2500
2750
3000
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
FULL CYCLE AVERAGE POWER DISSIPATION
120-deg Conduction -includes spread loss
as function of overlap angle , U
Average Power , Pavg (W)
Peak Current ,It (kA)
Peak Current ,It (kA)
92j:
U
U
120 degrees
120 deg + U
"U"
2
20
40
PG:6.094 sh3 9/1/92
Peak
Conduction Angle
Current
I
T
180
o
150
o
120
o
90
o
60
o
30
o
Full Cycle Average Power
(A)
(watts)
1000
303
258
210
161
110
66
1500
514
437
355
270
184
109
2000
741
629
512
388
263
155
2500
981
833
677
513
347
203
3000
1234
1047
851
645
436
255
3500
1498
1271
1032
782
528
309
4000
1774
1505
1222
926
625
365
4500
2062
1749
1420
1075
725
424
5000
2361
2003
1626
1231
830
485
Peak
Overlap Angle
Current
I
T
u=2
o
u=20
o
u=40
o
Full Cycle Average Power
(A)
(watts)
1000
351
342
332
1500
587
573
560
2000
841
823
805
2500
1100
1087
1065
3000
1395
1366
1339
3500
1694
1659
1626
4000
2009
1967
1927
4500
2338
2289
2241
5000
2683
2625
2569
C795 /
C795 /
C795 /
C795 /
C795 / T305
T305
T305
T305
T305
Date: 8/22/95
MOUNTING PRESSPAKS TO HEAT DISSIPATORS
The following instruction is essential for maintaining low,
stable thermal and electrical resistances associated with
the PRESSPAK to heat dissipator surfaces.
1. INSPECTION OF MATING SURFACES
Check each mating surface for nicks,scratches and surface
finish.The PRESSPAK surface has a total indicator reading
TIR < .0005 inch and surface finish 32 prior to factory
electrical test in pressure fixtures. The dissipator
surface should be equally as good.The TIR of a fully
tested PRESSPAK may run higher but not exceed 0.002 inch
not including some minor nicks and scratches associated
with the test fixtures. Any bow created by clamp system
at assembly must keep flatness within 0.002 inch.
2. SURFACE DEOXIDATION AND CLEANING
Although plated surfaces are recommended for aluminum and
copper heat dissipators, bare surfaces may be used if
careful attention to cleaning and treating is assured.
Plated surfaces and PRESSPAKS should be lightly sanded
with 600 grit paper, then oil or compound applied as
recommended. Unplated aluminum surfaces should be
vigorously abraided with a fine wire brush or 3M
"Scotchbrite" coated with Alcoa EJC #2 compound. The EJC
# 2 should be removed and the recommended compound
applied.
3. FINAL SURFACE TREATMENT
Apply silicone oil or a very thin layer of grease or
compound as indicated below. Rotate the PRESSPAK to
properly distribute the applied agent.
. bare copper
- use G322L or LS2037
. bare aluminum - use EJC #2 or G322L
. tin plated copper or aluminum
- preferably reapply DC550 or SF1154
- alternatively use G623 or G322L
. nickel plated aluminum - use DC550,G623 or G322L
. silver plating - not recommended
Recommended silicone oils are SF1154 or DC550
(200 centistoke)
4. MOUNTING
Assemble with specified mounting force applied through a
self-leveling swivel connection. The diameter of the
swivel should be preferably equal but not smaller than
the poleface diameter of the PRESSPAK. Center holes on
the top and bottom of the PRESSPAK are for locating.
NOTES:
Silicone oil DC550 (200 centistoke) is a
product of DOW CORNING; clear silicone grease
G623, yellow G322L and SF1154(200 centistoke)
GE Silicones Waterford NY; EJC# 2 from ALCOA
and black LS2037 from ARCO , 7301 Bessemer Ave.
Cleveland OH.
Limit maximum joint temperature to:
-
95 C using EJC #2
-
150 C using SF1154,DC550 or G322L
5. APPLIED MOUNTING FORCE
The selection of an appropriate commercially available
spring clamping hardware* should consider eatablishing
and maintaining the specified mounting force over the
operating temperature range and operating life of the
PRESSPAK.Thus essential ratings such as thermal resit-
ance ,di/dt,surge current and thermal cycling will not
be impaired.
Specified forces for this product are as
follows:
17000-19000 lbs.
75.6 - 84.5 kN
7725 - 9500 kg
* Consult factory for recommendations or more detailed
instructions.
175 GREAT VALLEY PKWY. , MALVERN PA 19355 USA
C795 /
C795 /
C795 /
C795 /
C795 / T305
T305
T305
T305
T305
10
100
10
100
100
78
60
56
10
12.17
15
15.7
1
10
Non-Repetitive Surge Current
and I t for Fusing
Sine Pulse Duration, tp (milliseconds)
I t
Sine Pulse Duration, tp (milliseconds)
92J:
kA
A S
E6
2
2
Itsm
2
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