Teccor
®
brand Thyristors
20 / 25 Amp Standard SCRs
Sxx20x & Sxx25x Series
Description
Excellent unidirectional switches for phase control
applications such as heating and motor speed controls.
Standard phase control SCRs are triggered with few
milliamperes of current at less than 1.5V potential.
Features & Benefits
to 1000 V
junctions
350 A
Applications
Agency File Number
L Package: E71639
Agency Approval
Agency
®
Typical applications are AC solid-state switches, industrial
power tools, exercise equipment, white goods and
commercial appliances.
Internally constructed isolated packages are offered for
ease of heat sinking with highest isolation voltage.
Main Features
Schematic Symbol
Symbol
I
T(RMS)
V
DRM
/V
RRM
I
GT
Value
20 & 25
400 to 1000
30 to 35
Unit
A
V
mA
A
K
G
Absolute Maximum Ratings — 20A SCR
Symbol
I
T(RMS)
I
T(AV)
Parameter
RMS on-state current
Average on-state current
Sxx20x
Test Conditions
T
C
= 80°C
T
C
= 80°C
Value
20
12.8
255
A
300
374
125
3
0.6
-40 to 150
-40 to 125
A
2
s
A/μs
A
W
°C
°C
Unit
A
A
I
TSM
Peak non-repetitive surge current
single half cycle; f = 50Hz;
T
J
(initial) = 25°C
single half cycle; f = 60Hz;
T
J
(initial) = 25°C
I
2
t
di/dt
I
GM
P
G(AV)
T
stg
T
J
I
2
t Value for fusing
Critical rate of rise of on-state current
Peak gate current
Average gate power dissipation
Storage temperature range
Operating junction temperature range
t
p
= 8.3 ms
f = 60Hz ; T
J
= 125°C
T
J
= 125°C
T
J
= 125°C
Sxx20x & Sxx25x Series
295
©2013 Littelfuse, Inc
Specifications are subject to change without notice.
Revised: 09/23/13
Teccor
®
brand Thyristors
20 / 25 Amp Standard SCRs
Absolute Maximum Ratings — 25A SCR
Symbol
I
T(RMS)
I
T(AV)
Parameter
RMS on-state current
Test Conditions
Sxx25L: T
C
=75°C
Sxx25R/Sxx25N: T
C
=100°C
Sxx25L
Average on-state current
Sxx25R/Sxx25N
T
C
= 75°C
T
C
= 100°C
300
A
350
510
150
3.5
0.8
-40 to 150
-40 to 125
A
2
s
A/μs
A
W
°C
°C
Value
25
Unit
A
16.0
A
I
TSM
I
2
t
di/dt
I
GM
P
G(AV)
T
stg
T
J
Peak non-repetitive surge current
single half cycle; f = 50Hz;
T
J
(initial) = 25°C
single half cycle; f = 60Hz;
T
J
(initial) = 25°C
t
p
= 8.3 ms
f = 60Hz ; T
J
= 125°C
T
J
= 125°C
T
J
= 125°C
I
2
t Value for fusing
Critical rate of rise of on-state current
Peak gate current
Average gate power dissipation
Storage temperature range
Operating junction temperature range
Electrical Characteristics
(T
J
= 25°C, unless otherwise specified)
Symbol
I
GT
V
GT
400V
V
D
= V
DRM
; gate open; T
J
= 100°C
dv/dt
600V
800V
1000V
400V
V
D
= V
DRM
; gate open; T
J
= 125°C
V
GD
I
H
t
q
t
gt
V
D
= V
DRM
; R
L
= 3.3 k:; T
J
= 125°C
I
T
= 400mA (initial)
(1)
I
G
= 2 x I
GT
; PW = 15μs; I
T
= 40A
600V
800V
MIN.
MAX.
MAX.
TYP
.
40
35
2
MIN.
Test Conditions
MAX.
V
D
= 12V; R
L
= 30:
MIN.
MAX.
Value
Sxx20L
30
1
1.5
450
425
400
200
350
325
300
0.2
50
V
mA
μs
μs
V/μs
Sxx25x
35
1
Unit
mA
V
Notes :
xx = voltage, x = package
(1) I
T
=2A; t
p
=50μs; dv/dt=5V/μs; di/dt=-30A/μs
Sxx20x & Sxx25x Series
296
©2013 Littelfuse, Inc
Specifications are subject to change without notice.
Revised: 09/23/13
Teccor
®
brand Thyristors
20 / 25 Amp Standard SCRs
Static Characteristics
Symbol
V
TM
Test Conditions
20A Device I
T
= 40A; t
p
= 380μs
25A Device I
T
= 50A; t
p
= 380μs
T
J
= 25°C
10
20
500
I
DRM
/ I
RRM
V
DRM
/ V
RRM
T
J
= 100°C
800V
1000V
T
J
= 125°C
MAX.
1000
3000
1000
800V
2000
μA
MAX.
Value
1.6
Unit
V
Thermal Resistances
Symbol
Parameter
Sxx25R /
Sxx25N
R
T(J-C)
Junction to case (AC)
Sxx20L
Sxx25L
Sxx25R
R
T(J-A)
Note: xx = voltage
Value
1.0
2.4
2.35
40
Unit
°C/W
Junction to ambient
Sxx20L
/ Sxx25L
°C/W
50
Figure 1: Normalized DC Gate Trigger Current
vs. Junction Temperature
2.0
Figure 2: Normalized DC Gate Trigger Voltage
vs. Junction Temperature
2.0
1.5
Ratio of V
GT
/ V
GT
(T
J
= 25ºC)
Ratio of I
GT
/ I
GT
(T
J
= 25ºC)
1.5
1.0
1.0
0.5
0.5
0.0
-40
-15
10
35
60
85
110
125
0.0
-40
-15
10
35
60
85
110
125
Junction Temperature (T
J
) – (ºC)
Junction Temperature (T
J
) – (ºC)
Sxx20x & Sxx25x Series
297
©2013 Littelfuse, Inc
Specifications are subject to change without notice.
Revised: 09/23/13
Teccor
®
brand Thyristors
20 / 25 Amp Standard SCRs
Figure 3: Normalized DC Holding Current
vs. Junction Temperature
2.0
Figure 4: On-State Current vs. On-State
Voltage (Typical)
90
T
J
= 25°C
80
70
60
50
40
30
20
10
0
Sxx20L
1.5
Intantaneous On-state Current (i
T
) – Amps
Ratio of I
H
/ I
H
(T
J
= 25ºC)
Sxx25L
Sxx25R
Sxx25N
1.0
0.5
0.0
-40
-15
10
35
60
85
110
125
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
Junction Temperature (T
J
) – (ºC)
Instantaneous On-state Voltage (v
T
) – Volts
Figure 5: Power Dissipation (Typical)
vs. RMS On-State Current
22
Figure 6: Maximum Allowable Case Temperature
vs. RMS On-State Current
130
125
120
Average On-State Power Dissipation
[P
D(AV)
] - (Watts)
20
18
Maximum Allowable Case
Temperature (T
C
) - °C
16
14
12
10
8
6
4
2
0
0
5
10
15
20
25
Sxx25L
Sxx25R
Sxx25N
Sxx20L
115
110
105
100
Sxx25R
Sxx25N
Sxx25L
95
90
85
80
75
70
0
5
10
15
20
25
30
CURRENT WAVEFORM: Sinusoidal
LOAD: Resistive or Inductive
CONDUCTION ANGLE: 180°
Sxx20L
RMS On-State Current [I
T(RMS)
] - (Amps)
RMS On-State Current [I
T(RMS)
] - Amps
Figure 7: Maximum Allowable Case Temperature
vs. Average On-State Current
130
125
Figure 8: Maximum Allowable Ambient Temperature
vs. RMS On-State Current
120
CURRENT WAVEFORM: Sinusoidal
LOAD: Resistive or Inductive
CONDUCTION ANGLE: 180°
FREE AIR RATING
Maximum Allowable Case
Temperature (T
C
) - °C
115
110
105
100
95
90
85
80
75
70
0
2
4
6
8
10
CURRENT WAVEFORM: Sinusoidal
LOAD: Resistive or Inductive
CONDUCTION ANGLE: 180°
Sxx20L
Sxx25R
Sxx25N
Maximum Allowable Ambient
Temperature (T
A
) - ºC
120
100
80
Sxx25L
Sxx25N
Sxx25R
Sxx20L
60
Sxx25L
40
20
0
12
14
16
18
0.0
0.5
1.0
1.5
2.0
2.5
Average On-State Current [I
T(AVE)
] - Amps
RMS On-State Current [I
T(RMS)
] - Amps
Sxx20x & Sxx25x Series
298
©2013 Littelfuse, Inc
Specifications are subject to change without notice.
Revised: 09/23/13
Teccor
®
brand Thyristors
20 / 25 Amp Standard SCRs
Figure 9: Maximum Allowable Ambient Temperature vs. Average On-State Current
120
CURRENT WAVEFORM: Sinusoidal
LOAD: Resistive or Inductive
CONDUCTION ANGLE: 180°
FREE AIR RATING
Sxx25L
Sxx25N
Sxx25R
Sxx20L
Maximum Allowable Ambient
Temperature (T
A
) - ºC
100
80
60
40
20
0
0.0
0.5
1.0
1.5
Average On-State Current [I
T(AVE)
] - Amps
Note: xx = voltage
Figure 10: Peak Capacitor Discharge Current
1000
Figure 11: Peak Capacitor Discharge Current Derating
1.2
Sxx25L
Sxx25R
Sxx25N
Peak Discharge Current (I
TM
) - Amps
1.0
Normalized Peak Current
50.0
0.8
Sxx20L
100
0.6
0.4
I
TRM
0.2
t
W
10
0.5
1.0
10.0
0.0
0
25
50
75
100
125
150
Pulse Current Duration (t
W
) - ms
Case Temperature (T
C
) - ºC
Figure 12: Surge Peak On-State Current vs. Number of Cycles
1000
Peak Surge (Non-repetitive)On-state
Current (I
TSM
) – Amps
SUPPLY FREQUENCY: 60 Hz Sinusoidal
LOAD: Resistive
RMS On-State Current: [I
T(RMS)
]: Maximum Rated
Value at Specified Case Temperature
Sxx25L
Sxx25R
Sxx25N
100
Sxx20L
Notes:
1. Gate control may be lost during and immediately
following surge current interval.
2. Overload may not be repeated until junction
temperature has returned to steady-state
rated value.
10
1
10
100
1000
Surge Current Duration -- Full Cycles
Sxx20x & Sxx25x Series
299
©2013 Littelfuse, Inc
Specifications are subject to change without notice.
Revised: 09/23/13
