Revised: 02/16/18

Specifications are subject to change without notice.

©2018 Littelfuse, Inc

Thyristors

12 Amp High Junction Temperature SCRs

SJxx12xx Series

Figure 7: Maximum Allowable Case Temperature

vs. Average On-State Current

12 Amps High Junction Temperature SCRs

Figure 8: Peak Capacitor Discharge Current

10

100

1000

0

.

0

5

0

.

5

2

0

.

5

5.

0

Pulse Current Duration (t

I

TRM

t

W

SJxx12xx Series

Figure 9: Peak Capacitor Discharge Current Derating

1

10

100

1000

0

0

0

1

0

0

1

0

1

1

Surge Current Duration - Full Cycles

Figure 10: Surge Peak On-State Current vs. Number of Cycles

SUPPLY FREQUENCY: 60 Hz Sinusoidal

LOAD: Resistive

RMS On-State Current: [I

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.