Littelfuse QxxxxLTx Series - Manual (Page 5)

173
Revised: 09/23/13
©2013 Littelfuse, Inc
Specifications are subject to change without notice.
Teccor ® brand Thyristors
4 / 6 / 8 / 10 / 15 Amp Quadracs
QxxxxLTx Series
Figure 7: Surge Peak On-State Current vs. Number of Cycles
Note: xx = voltage
1
10
100
1000
1 10 100 1000
Surge Current Duration -- Full Cycles
Peak Surge (Non-repetitive) On-state Current (I
TSM
) – Amps
Qxx15LT/Qxx15LTH
Qxx04LT
Qxx10LT/Qxx10LTH
Qxx08LT/Qxx08LTH
Qxx06LT/Qxx06LTH
Supply Frequency: 60Hz Sinusoidal
Load: Resistive
RMS On-State Current: [I
T(RMS)
]: Maximum Rated
Value at Specific 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.
-8%
-6%
-4%
-2%
0%
2%
4%
6%
-40 -20 0 20 40 60 80 100 120 140
Junction Temperature (T
J
) -- °C
V
BO
C
h
a
nge
-
- %
Figure 8: DIAC V
BO
Change vs. Junction Temperature
D.U.T. MT2
MT1
C
T
= 0.1 μF
T
V
C
120 V
60 Hz
R
L
ΔV+
ΔV-
V
C
+V
BO
-V
BO
0
I
L
+I
PK
-I
PK
0 t
t
Typical pulse base width is 10μs
Figure 9: Test Circuit
Figure 10: Test Circuit Waveform
0
50
100
150
200
250
300
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Triggering Capacitance (C
T
) – μF
Peak Output Current (I
PK
) – mA
Typical (3
5V Device)
Figure 11: Peak Output Current vs Triggering
Capacitance (Per Figure 9)