Littelfuse Sxx25x Series - Manual (Page 4)

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