Teccor
®
brand Thyristors
4 / 6 / 8 / 10 / 15 Amp Quadracs
QxxxxLTx Series
Description
The Quadrac is an internally triggered Triac designed for
AC switching and phase control applications. It is a Triac
and DIAC in a single package, which saves user expense
by eliminating the need for separate Triac and DIAC
components.
Standard type devices normally operate in Quadrants I & III
triggered from AC line.
Alternistor type Quadracs are used in circuits requiring high
dv/dt capability.
Features & Benefits
Agency Approval
Agency
®
200 A
Agency File Number
L Package : E71639
junctions
600 V
Applications
Excellent for AC switching and phase control applications
such as lighting and heating. Typical applications are AC
solid-state switches, light dimmers, power tools, home/
brown goods and white goods appliances.
Alternistor Quadracs (no snubber required) are used in
applications with extremely inductive loads requiring
highest commutation performance.
Unit
A
V
V
Schematic Symbol
MT2
MT1
T
Main Features
Symbol
I
T(RMS)
V
DRM
/ V
RRM
DIAC V
BO
Value
4 to 15
400 to 600
33 to 43
Internally constructed isolated package is offered for ease
of heat sinking with highest isolation voltage.
QxxxxLTx Series
169
©2013 Littelfuse, Inc
Specifications are subject to change without notice.
Revised: 09/23/13
Teccor
®
brand Thyristors
4 / 6 / 8 / 10 / 15 Amp Quadracs
Absolute Maximum Ratings
Value
Qxx06LT /
Qxx06LTH
Qxx08LT /
Qxx08LTH
Symbol
Parameter
Qxx15LT /
Qxx15LTH
15
167
A
55
12.5
50
80
26.5
100
41
70
1.5
-40 to 150
-40 to 125
120
60
200
166
100
A
2
s
A/μs
A
°C
°C
Qxx15LT
70
300
200
200
150
V/μs
μs
V/μs
Qxx10LT /
Qxx10LTH
Qxx04LT
Unit
I
T(RMS)
RMS forward current
I
TSM
I
2
t
di/dt
I
GM
T
stg
T
J
Note: xx = voltage
Peak non-repetitive surge current
Qxx04LT: T
C
= 95°C
Qxx06LT/Qxx08LT/Qxx10LT: T
C
= 90°C
Qxx15LT: T
C
= 80°C
single half cycle; f = 50Hz;
T
J
(initial) = 25°C
single half cycle; f = 60Hz;
T
J
(initial) = 25°C
t
p
= 8.3ms
f = 60Hz; T
J
=125°C
T
J
= 125°C
4
46
6
65
8
83
10
100
A
I
2
t value for fusing
Critical rate-of-rise of on-state current
Peak gate current
Storage temperature range
Operating junction temperature range
Electrical Characteristics
(T
J
= 25°C, unless otherwise specified)
– Standard Quadrac
Value
Qxx04LT
Qxx06LT
Qxx08LT
Symbol
Test Conditions
Qxx10LT
Unit
I
H
I
T
= 200mA (initial)
V
D
= V
DRM
; gate open; T
J
=100°C
MIN.
MAX.
400V
600V
400V
600V
MIN.
TYP
.
40
75
50
50
50
3
50
150
125
100
85
60
175
150
120
100
4
3
60
200
175
150
120
mA
dv/dt
V
D
= V
DRM
; gate open; T
J
=125°C
dv/dt(c)
t
gt
di/dt(c) = 0.54 x I
T(rms)
/ ms; T
J
= 125°C
(note 1)
MIN.
(1) Reference test circuit in figure 10 and waveform in figure 11; C
T
= 0.1μF with 0.1μs rise time.
Note: xx = voltage
Electrical Characteristics
(T
J
= 25°C, unless otherwise specified)
– Alternistor Quadrac
Value
Qxx06LTH
Qxx08LTH
Symbol
Test Conditions
Qxx15LTH
Qxx10LTH
Unit
I
H
I
T
= 20mA (initial)
V
D
= V
DRM
; gate open; T
J
=100°C
MIN.
MAX.
400V
600V
400V
600V
MIN.
TYP
.
50
575
425
450
350
25
50
60
925
775
700
600
30
3
70
mA
dv/dt
V
D
= V
DRM
; gate open; T
J
=125°C
dv/dt(c)
t
gt
di/dt(c) = 0.54 x I
T(rms)
/ ms; T
J
= 125°C
(note 1)
MIN.
V/μs
V/μs
μs
(1) Reference test circuit in figure 10 and waveform in figure 11; C
T
= 0.1μF with 0.1μs rise time.
Note: xx = voltage
QxxxxLTx Series
170
©2013 Littelfuse, Inc
Specifications are subject to change without notice.
Revised: 09/23/13
Teccor
®
brand Thyristors
4 / 6 / 8 / 10 / 15 Amp Quadracs
Trigger DIAC Specifications
Symbol
ΔV
BO
V
BO
[ΔV±]
I
BO
C
T
Test Conditions
Breakover Voltage Symmetry
Breakover Voltage, forward and reverse
Dynamic Breakback Voltage, forward and reverse (note 1)
Peak Breakover Current
Trigger Firing Capacitance
MAX.
MIN.
MAX.
MIN.
MAX.
MAX.
Value
3
33
43
5
25
0.1
Unit
V
V
V
uA
μF
(1) Reference test circuit in figure 10 and waveform in figure 11.
Static Characteristics
Symbol
V
TM
Test Conditions
I
T
= 1.41 x I
T(rms)
A; t
p
= 380μs
T
J
= 25°C
I
DRM
/ I
RRM
V
DRM
/ V
RRM
T
J
= 100°C
T
J
= 125°C
MAX.
MAX.
Value
1.6
10
500
2000
μA
Unit
V
Thermal Resistances
Symbol
Parameter
Qxx04LT
Qxx06LT /
Qxx06LTH
R
T(J-C)
Junction to case (AC)
Qxx08LT /
Qxx08LTH
Qxx10LT /
Qxx10LTH
Qxx15LT /
Qxx15LTH
R
T(J-A)
Note : xx = voltage
Value
3.6
3.3
2.8
2.6
2.1
50
Unit
°C/W
Junction to ambient
°C/W
QxxxxLTx Series
171
©2013 Littelfuse, Inc
Specifications are subject to change without notice.
Revised: 09/23/13
Teccor
®
brand Thyristors
4 / 6 / 8 / 10 / 15 Amp Quadracs
Figure 1: Normalized DC Holding Current
vs. Junction Temperature
2.0
Figure 2: On-State Current vs. On-State Voltage
(Typical) (4A)
16
14
12
10
Qxx04LT
8
6
4
2
0
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
T
J
= 25°C
Ratio of I
H
/I
H
(T
J
= 25°C)
1.5
1.0
0.5
0.0
-40
-15
10
35
60
85
110
Instantaneous On-state Current (i
T
) – Amps
Instantaneous On-state Voltage (v
T
) – Volts
Junction Temperature (T
J
) -- °C
Figure 3: On-State Current vs. On-State Voltage
(Typical) (6A to 15A)
50
45
40
35
30
25
20
15
10
5
0
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
Qxx06LT/Qxx06LTH
Qxx08LT/Qxx08LTH
Qxx10LT/Qxx10LTH
Qxx15LT
Qxx15LTH
T
J
= 25°C
Figure 4: Power Dissipation vs. RMS On-State
Current (Typical) (4A)
4.0
3.5
Average On-State Power Dissipation
[P
D(AV)
] - (Watts)
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
CURRENT WAVEFORM: Sinusoidal
LOAD: Resistive or Inductive
CONDUCTION ANGLE: 360°
Qxx04LT
Instantaneous On-state Current (i
T
) – Amps
Instantaneous On-state Voltage (v
T
) – Volts
RMS On-State Current [I
T(RMS)
] - (Amps)
Figure 5: Power Dissipation vs. RMS On-State Current
(Typical) (6A to 15A)
18
Figure 6: Maximum Allowable Case Temperature
vs. RMS On-State Current
130
Maximum Allowable Case Temperature
(T
C
) - °C
Average On-State Power Dissipation
[P
D(AV)
] - (Watts)
16
14
12
10
8
6
4
2
0
0
2
4
6
8
10
12
14
16
CURRENT WAVEFORM: Sinusoidal
LOAD: Resistive or Inductive
CONDUCTION ANGLE: 360°
Qxx15LT
Qxx15LTH
120
Qxx08LT
Qxx08LTH
CURRENT WAVEFORM: Sinusoidal
LOAD: Resistive or Inductive
CONDUCTION ANGLE: 180°
Qxx06LT/Qxx06LTH
Qxx08LT/Qxx08LTH
Qxx10LT/Qxx10LTH
110
Qxx10LT
Qxx10LTH
Qxx04LT
90
Qxx06LT
Qxx06LTH
Qxx15LT
Qxx15LTH
100
80
70
0
2
4
6
8
10
12
14
16
RMS On-State Current [I
T(RMS)
] - (Amps)
RMS On-State Current [I
T(RMS)
] - Amps
QxxxxLTx Series
172
©2013 Littelfuse, Inc
Specifications are subject to change without notice.
Revised: 09/23/13
Teccor
®
brand Thyristors
4 / 6 / 8 / 10 / 15 Amp Quadracs
Figure 7: Surge Peak On-State Current vs. Number of Cycles
1000
Peak Surge (Non-repetitive)
On-state Current (I
TSM
) – Amps
Qxx15LT/Qxx15LTH
Qxx10LT/Qxx10LTH
100
Qxx08LT/Qxx08LTH
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.
Qxx06LT/Qxx06LTH
10
Qxx04LT
1
1
10
100
1000
Surge Current Duration -- Full Cycles
Note: xx = voltage
Figure 8: DIAC V
BO
Change vs. Junction Temperature
6%
Figure 9: Test Circuit
4%
R
L
V
BO
Change -- %
2%
0%
120 V
60 Hz
D.U.T.
MT2
-2%
-4%
T
-6%
-8%
-40
-20
0
20
40
60
80
100
120
140
V
C
C
T
= 0.1
μF
MT1
Junction Temperature (T
J
) -- °C
Figure 10: Test Circuit Waveform
V
C
Figure 11: Peak Output Current vs Triggering
Capacitance (Per Figure 9)
300
ΔV+
Peak Output Current (I
PK
) – mA
+V
BO
250
0
t
200
ΔV-
-V
BO
I
L
+I
PK
150
l (3
ica
Typ
5
e
VD
vic
e)
100
50
0
t
0
0.1
-I
PK
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Typical pulse base width is 10μs
Triggering Capacitance (C
T
) – μF
QxxxxLTx Series
173
©2013 Littelfuse, Inc
Specifications are subject to change without notice.
Revised: 09/23/13
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