334

Revised: 09/23/13

©2013 Littelfuse, Inc

Specifications are subject to change without notice.

65 / 70 Amp Standard SCRs

Sxx65x & Sxx70x Series

Figure 7: Maximum Allowable Case Temperature vs. Average On-State Current

70

75

80

85

90

95

100

105

110

115

120

125

130

0

5

10

15

20

25

30

35

40

4550

CURRENT WAVEFORM: Sinusoidal

LOAD: Resistive or Inductive

CONDUCTION ANGLE: 180°

Sxx65K

Sxx65J

Average On-State Current [I

Sxx70W

The "K" package rating with its narrow leads is

intended for high surge condition use only and not

recommended for >32A (AV) continuous current use

since lead temperature depending on lead length can

exceed PCB solder melting temperature. "J" or "W"

packages are recommended for >32A (AV) continu-

ous current requirements.

10

100

1000

1

10

100

1000

Sxx65K

Sxx65J

Sxx70W

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.

Figure 8: Peak Capacitor Discharge Current

Figure 9: Peak Capacitor Discharge Current Derating

100

1000

10000

0.5

1.0

10.0

50.0

Pulse Current Duration (t

I

TRM

t

W

0.0

0.2

0.4

0.6

0.8

1.0

1.2

0255075

100

125

150

Case Temperature (T

Note: xx = Voltage