© 2016 Littelfuse, Inc.

Specifications are subject to change without notice.

Revised: 06/14/16

20 / 25 Amp Standard SCRs

Figure 3: Normalized DC Holding Current

vs. Junction Temperature

Figure 4: On-State Current vs. On-State

Voltage (Typical)

125

0.0

0.5

1.0

1.5

2.0

-40

-1510356085110

Junction Temperature (T

T

0

10

20

30

40

50

60

70

80

90

0.70.8

0.91.0

1.11.2

1.31.4

1.51.6

Sxx25L

Sxx25R

Sxx25N

Sxx20L

Instantaneous On-state Voltage (v

Figure 5: Power Dissipation (Typical)

vs. RMS On-State Current

Figure 6: Maximum Allowable Case Temperature

vs. RMS On-State Current

0

2

4

6

8

10

12

14

16

18

20

22

05

10

15

20

25

Sxx25L

Sxx25R

Sxx25N

Sxx20L

RMS On-State Current [I

70

75

80

85

90

95

100

105

110

115

120

125

130

05

10

15

20

25

30

CURRENT WAVEFORM: Sinusoidal

LOAD: Resistive or Inductive

CONDUCTION ANGLE: 180°

Sxx25R

Sxx25N

Sxx20L

Sxx25L

RMS On-State Current [I

Figure 7: Maximum Allowable Case Temperature

vs. Average On-State Current

Figure 8: Maximum Allowable Ambient Temperature

vs. RMS On-State Current

70

75

80

85

90

95

100

105

110

115

120

125

130

02

46

81012141618

CURRENT WAVEFORM: Sinusoidal

LOAD: Resistive or Inductive

CONDUCTION ANGLE: 180°

Sxx20L

Sxx25L

Sxx25R

Sxx25N

Average On-State Current [I

0

20

40

60

80

100

120

0.0

0.5

1.01.5

2.0

2.5

CURRENT WAVEFORM: Sinusoidal

LOAD: Resistive or Inductive

CONDUCTION ANGLE: 180°

FREE AIR RATING

Sxx20L

Sxx25L

Sxx25N

Sxx25R

RMS On-State Current [I