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Teccor, Brand thyristors, 20 / 25 amp standard scrs – Littelfuse Sxx25x Series User Manual

Page 4

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298

Revised: 09/23/13

©2013 Littelfuse, Inc

Specifications are subject to change without notice.

Teccor

®

brand Thyristors

20 / 25 Amp Standard SCRs

Sxx20x & Sxx25x Series

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

-15

10

35

60

85

110

Junction Temperature (T

J

) – (ºC)

Ratio of I

H

/ I

H

(T

J

= 2

5

ºC)

T

J

= 25°C

0

10

20

30

40

50

60

70

80

90

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

1.5

1.6

Sxx25L
Sxx25R
Sxx25N

Sxx20L

Instantaneous On-state Voltage (v

T

) – Volts

Intantaneous On-stat

e Cur

rent (i

T

) –

Amps

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

0

5

10

15

20

25

Sxx25L
Sxx25R
Sxx25N

Sxx20L

RMS On-State Current [I

T(RMS)

] - (Amps)

A

v

er

ag

e On-Stat

e

P

o

w

er Dissipation

[P

D(A

V

)

] - (W

at

ts)

70

75

80

85

90

95

100

105

110

115

120

125

130

0

5

10

15

20

25

30

CURRENT WAVEFORM: Sinusoidal
LOAD: Resistive or Inductive
CONDUCTION ANGLE: 180°

Sxx25R
Sxx25N

Sxx20L

Sxx25L

RMS On-State Current [I

T(RMS)

] - Amps

Maximum Allo

w

able

Case

Temper

at

ur

e (T

C

) - °C

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

0

2

4

6

8

10

12

14

16

18

CURRENT WAVEFORM: Sinusoidal
LOAD: Resistive or Inductive
CONDUCTION ANGLE: 180°

Sxx20L

Sxx25L

Sxx25R
Sxx25N

Average On-State Current [I

T(AVE)

] - Amps

Maximum Allo

w

able

Case

Temper

at

ur

e (T

C

) - °C

0

20

40

60

80

100

120

0.0

0.5

1.0

1.5

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

T(RMS)

] - Amps

Maximum Allo

w

able Ambient

Temper

at

ur

e (T

A

) - ºC