Data Sheets SCRs
©2004 Littelfuse, Inc. E6 - 11 http://www.littelfuse.com
Thyristor Product Catalog +1 972-580-7777
Figure E6.23 Peak Surge Current versus Surge Current Duration
Figure E6.24 Power Dissipation (Typical) versus RMS On-state Current
(1 A)
Figure E6.25 Power Dissipation (Typical) versus RMS On-state Current
(6 A through 20 A)
8
1
2
3
4
5
6
1000
10
20
30
40
50
60
80
100
200
300
400
500
600
800
12354 6 78 10 20 30 40 60 80100 200 300400 600 1000
Surge Current Duration – Full Cycles
70 A Devices
65 A TO-218
55 A Devices
25 A Devices
35 A Devices
20 A Devices
16 A Devices
15 A Devices
12 A Devices
10 A Devices
1 A Devices
SUPPLY FREQUENCY: 60 Hz Sinusoidal
LOAD: Resistive
RMS ON-STATE CURRENT: [I
T(RMS)
]: Max-
Rated Value at Specified Case Temperature
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.
8 A Devices
6 A Devices
Peak Surge (Non-repetitive) On-state Current (I
TSM
) – Amps
40 A Devices
0 0.2 0.4 0.6 0.8
0
0.4
0.8
1.0
0.2
RMS On-state Current [I
T(RMS)
] – Amps
Average On-state Power
Dissipation [P
D(AV)
] – Watts
CURRENT WAVEFORM: Half Sine Wave
LOAD: Resistive or Inductive
CONDUCTION ANGLE: 180˚
1.0 A Devices
1.0
0.6
0481216
0
RMS On-state Current [I
T(RMS)
] – Amps
Average On-state
Power Dissipation [P
D(AV)
] – Watts
CURRENT WAVEFORM: Half Sine Wave
LOAD: Resistive or Inductive
CONDUCTION ANGLE: 180˚
2 6 10 14 18
2
4
6
8
10
12
14
16
18
20
15 A to 20 A Devices
12 A Devices
6 A to 10 A Devices
