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Teccor® brand Thyristors
4 / 6 / 8 / 10 / 15 Amp Quadracs
QxxxxLTx Series
RoHS ®
Agency Approval
Agency
®
Schematic Symbol
Agency File Number
L Package : E71639
MT2
MT1
Main Features
Symbol
IT(RMS)
VDRM / VRRM
DIAC VBO
T
Value
4 to 15
400 to 600
33 to 43
Unit
A
V
V
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
• RoHS Compliant
• Glass – passivated
junctions
• Voltage capability up to
600 V
• Surge capability up to
200 A
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.
Internally constructed isolated package is offered for ease
of heat sinking with highest isolation voltage.
Additional Information
Datasheet
Resources
Samples
© 2014 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/14/14

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Teccor® brand Thyristors
4 / 6 / 8 / 10 / 15 Amp Quadracs
Absolute Maximum Ratings
Symbol
Parameter
Value
Unit
IT(RMS)
RMS forward current
ITSM Peak non-repetitive surge current
I2t I2t value for fusing
di/dt Critical rate-of-rise of on-state current
IGM Peak gate current
Tstg Storage temperature range
TJ Operating junction temperature range
Note: xx = voltage
Qxx06LT/QQQxxxxxx010548LLLTTT::/TTQCCx==x189005°TCC: TC = 90°C
single half cycle; f = 50Hz;
TJ (initial) = 25°C
single half cycle; f = 60Hz;
TJ (initial) = 25°C
tp = 8.3ms
f = 60Hz; TJ =125°C
TJ = 125°C
4
46
55
12.5
50
Electrical Characteristics (TJ = 25°C, unless otherwise specified) – Standard Quadrac
6 8 10
65 83 100
80 100 120
26.5 41
60
70
1.5
-40 to 150
-40 to 125
Value
Symbol
Test Conditions
15 A
167
A
200
166 A2s
100 A/µs
A
°C
°C
Unit
IH
dv/dt
IT = 200mA (initial)
VD = VDRM; gate open; TJ=100°C
VD = VDRM; gate open; TJ=125°C
MAX.
MIN.
400V
600V
MIN.
400V
600V
40
75
50
50
50
50
150
125
100
85
dv/dt(c)
tgt
di/dt(c) = 0.54 x IT(rms) / ms; TJ = 125°C
(note 1)
MIN.
TYP.
(1) Reference test circuit in figure 10 and waveform in figure 11; CT = 0.1μF with 0.1μs rise time.
Note: xx = voltage
3
Electrical Characteristics (TJ = 25°C, unless otherwise specified) – Alternistor Quadrac
Symbol
Test Conditions
60 60
175 200
150 175
120 150
100 120
4
3
Value
70 mA
300
200 V/μs
200
150
V/μs
μs
Unit
IH
dv/dt
IT = 20mA (initial)
VD = VDRM; gate open; TJ=100°C
VD = VDRM; gate open; TJ=125°C
MAX.
MIN.
400V
600V
MIN.
400V
600V
dv/dt(c)
tgt
di/dt(c) = 0.54 x IT(rms) / ms; TJ = 125°C
(note 1)
MIN.
TYP.
(1) Reference test circuit in figure 10 and waveform in figure 11; CT = 0.1μF with 0.1μs rise time.
Note: xx = voltage
© 2014 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/14/14
50 50
575
425
450
350
25
60 70
925
775
700
600
30
3
mA
V/μs
V/μs
μs

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Teccor® brand Thyristors
4 / 6 / 8 / 10 / 15 Amp Quadracs
Trigger DIAC Specifications
Symbol
ΔVBO
Test Conditions
Breakover Voltage Symmetry
VBO Breakover Voltage, forward and reverse
[ΔV±]
Dynamic Breakback Voltage, forward and reverse (note 1)
IBO Peak Breakover Current
CT Trigger Firing Capacitance
(1) Reference test circuit in figure 10 and waveform in figure 11.
MAX.
MIN.
MAX.
MIN.
MAX.
MAX.
Static Characteristics
Symbol
VTM
IDRM / IRRM
Test Conditions
IT = 1.41 x IT(rms) A; tp = 380μs
VDRM / VRRM
TJ = 25°C
TJ = 100°C
TJ = 125°C
Thermal Resistances
Symbol
Rθ(J-C)
Rθ(J-A)
Note : xx = voltage
Parameter
Junction to case (AC)
Junction to ambient
Qxx04LT
Qxx06LT /
Qxx06LTH
Qxx08LT /
Qxx08LTH
Qxx10LT /
Qxx10LTH
Qxx15LT /
Qxx15LTH
Value
3
33
43
5
25
0.1
Unit
V
V
V
uA
µF
MAX.
MAX.
Value
1.6
10
500
2000
Unit
V
µA
Value
3.6
3.3
2.8
2.6
2.1
50
Unit
°C/W
°C/W
© 2014 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/14/14

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Teccor® brand Thyristors
4 / 6 / 8 / 10 / 15 Amp Quadracs
Figure 1: Normalized DC Holding Current
vs. Junction Temperature
2.0
1.5
1.0
0.5
0.0
-40 -15 10 35 60 85
Junction Temperature (TJ) -- °C
Figure 3: On-State Current vs. On-State Voltage
(Typical) (6A to 15A)
110
50
45 TJ = 25°C
40
35 Qxx15LT
Qxx15LTH
30
25
20
15 Qxx06LT/Qxx06LTH
Qxx08LT/Qxx08LTH
10 Qxx10LT/Qxx10LTH
5
0
0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6
Instantaneous On-state Voltage (vT) – Volts
1.7
Figure 5: Power Dissipation vs. RMS On-State Current
(Typical) (6A to 15A)
18
16
14
12
10
8
6
4
2
0
0
Qxx06LT/Qxx06LTH
Qxx08LT/Qxx08LTH
Qxx10LT/Qxx10LTH
Qxx15LT
Qxx15LTH
CURRENT WAVEFORM: Sinusoidal
LOAD: Resistive or Inductive
CONDUCTION ANGLE: 360°
2 4 6 8 10 12
RMS On-State Current [IT(RMS)] - (Amps)
14
16
© 2014 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/14/14
Figure 2: O n-State Current vs. On-State Voltage
(Typical) (4A)
16
14 TJ = 25°C
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
Instantaneous On-state Voltage (vT) – Volts
1.6
Figure 4: P ower Dissipation vs. RMS On-State
Current (Typical) (4A)
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0.0
Qxx04LT
CURRENT WAVEFORM: Sinusoidal
LOAD: Resistive or Inductive
CONDUCTION ANGLE: 360°
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
RMS On-State Current [IT(RMS)] - (Amps)
Figure 6: M aximum Allowable Case Temperature
vs. RMS On-State Current
130
120 Qxx08LT
Qxx08LTH
110
100
Qxx04LT
90
Qxx06LT
Qxx06LTH
80
CURRENT WAVEFORM: Sinusoidal
LOAD: Resistive or Inductive
CONDUCTION ANGLE: 180°
Qxx10LT
Qxx10LTH
Qxx15LT
Qxx15LTH
70
0
2 4 6 8 10 12 14
RMS On-State Current [IT(RMS)] - Amps
16

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Teccor® brand Thyristors
4 / 6 / 8 / 10 / 15 Amp Quadracs
Figure 7: Surge Peak On-State Current vs. Number of Cycles
1000
Qxx15LT/Qxx15LTH
Qxx10LT/Qxx10LTH
100
Qxx08LT/Qxx08LTH
Qxx06LT/Qxx06LTH
10
Qxx04LT
Supply Frequency: 60Hz Sinusoidal
Load: Resistive
RMS On-State Current: [IT(RMS)]: Maximum Rated
Value at Specific Case Temperature
Notes:
1. G ate control may be lost during and immediately
following surge current interval.
2. O verload may not be repeated until junction
temperature has returned to steady-state
rated value.
1
1 10 100
Surge Current Duration -- Full Cycles
Note: xx = voltage
Figure 8: DIAC VBO Change vs. Junction Temperature
4%
2%
0%
-2%
-4%
-6%
-8%
10%
-40
-20
0 20 40 60 80 100
Junction Temperature (TJ) -- °C
120
Figure 10: Test Circuit Waveform
VC
+VBO
0
-VBO
IL
+IPK
0
V+
t
V-
t
-IPK
Typical pulse base width is 10μs
1000
Figure 9: Test Circuit
RL
120 V
60 Hz
D.U.T.
MT2
T
VC
CT = 0.1 µF
MT1
Figure 11: P eak Output Current vs Triggering
Capacitance (Per Figure 9)
300
250
200
150 Typical (35V Device)
100
50
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Triggering Capacitance (CT) – μF
© 2014 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/14/14