Littelfuse QxxxxLTx User Manual
QxxxxLTx Series
Teccor® brand Thyristors
4 / 6 / 8 / 10 / 15 Amp Quadracs
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 Agency File Number
®
L Package : E71639
Schematic Symbol
MT2 MT1
T
Main Features
Symbol Value Unit
I
T(RMS)
V
/ V
DRM
DIAC V
RRM
BO
4 to 15 A
400 to 600 V
33 to 43 V
t3P)4$PNQMJBOU
t(MBTToQBTTJWBUFE
t4VSHFDBQBCJMJUZVQUP
200 A
junctions
t7PMUBHFDBQBCJMJUZVQUP
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.
Internally constructed isolated package is offered for ease
of heat sinking with highest isolation voltage.
QxxxxLTx Series
169
Specifications are subject to change without notice.
©2013 Littelfuse, Inc
Revised: 09/23/13
Absolute Maximum Ratings
Teccor® brand Thyristors
4 / 6 / 8 / 10 / 15 Amp Quadracs
Value
Symbol Parameter
Qxx04LT: TC = 95°C
I
T(RMS)
RMS forward current
Qxx06LT/Qxx08LT/Qxx10LT: TC = 90°C
Qxx15LT: TC = 80°C
single half cycle; f = 50Hz;
T
(initial) = 25°C
I
TSM
2
tI
I
Peak non-repetitive surge current
2
t value for fusing tp = 8.3ms 12.5 26.5 41 60 166 A2s
J
single half cycle; f = 60Hz;
(initial) = 25°C
T
J
di/dt Critical rate-of-rise of on-state current f = 60Hz; T
I
GM
T
stg
T
J
Note: xx = voltage
Operating junction temperature range -40 to 125 °C
Electrical Characteristics (T
Peak gate current TJ = 125°C 1.5 A
Storage temperature range -40 to 150 °C
= 25°C, unless otherwise specified) – Standard Quadrac
J
Symbol Test Conditions
I
H
dv/dt
dv/dt(c) di/dt(c) = 0.54 x I
t
gt
(1) Reference test circuit in figure 10 and waveform in figure 11; CT = 0.1F with 0.1s rise time.
Note: xx = voltage
IT = 200mA (initial) MAX. 40 50 60 60 70 mA
V
= V
; gate open; TJ=100°C MIN.
D
DRM
= V
V
; gate open; TJ=125°C MIN.
D
DRM
/ ms; TJ = 125°C MIN. 3 4 V/s
T(rms)
400V 75 150 175 200 300
600V 50 125 150 175 200
400V 50 100 120 150 200
600V 50 85 100 120 150
(note 1) TYP. 3 s
Unit
Qxx04LT
Qxx06LT /
Qxx08LT /
Qxx06LTH
Qxx08LTH
Qxx10LT /
Qxx10LTH
Qxx15LT /
Qxx15LTH
4681015A
46 65 83 100 167
55 80 100 120 200
=125°C 50 70 100 A/µs
J
Value
Unit
Qxx04LT
Qxx06LT
Qxx08LT
Qxx10LT
Qxx15LT
V/s
A
Electrical Characteristics (T
= 25°C, unless otherwise specified) – Alternistor Quadrac
J
Symbol Test Conditions
I
H
IT = 20mA (initial) MAX. 50 50 60 70 mA
V
= V
; gate open; TJ=100°C MIN.
D
DRM
dv/dt
V
= V
; gate open; TJ=125°C MIN.
D
DRM
dv/dt(c) di/dt(c) = 0.54 x I
t
gt
(1) Reference test circuit in figure 10 and waveform in figure 11; CT = 0.1F with 0.1s rise time.
Note: xx = voltage
QxxxxLTx Series
(note 1) TYP. 3 s
/ ms; TJ = 125°C MIN. 25 30 V/s
T(rms)
170
Value
Qxx06LTH
Qxx08LTH
Qxx10LTH
400V 575 925
600V 425 775
400V 450 700
600V 350 600
Specifications are subject to change without notice.
Unit
Qxx15LTH
V/s
©2013 Littelfuse, Inc
Revised: 09/23/13
Teccor® brand Thyristors
4 / 6 / 8 / 10 / 15 Amp Quadracs
Trigger DIAC Specifications
Symbol Test Conditions Value Unit
∆V
BO
V
BO
[∆V±] Dynamic Breakback Voltage, forward and reverse (note 1) MIN. 5 V
I
BO
C
T
(1) Reference test circuit in figure 10 and waveform in figure 11.
Static Characteristics
Symbol Test Conditions Value Unit
V
TM
/ I
I
DRM
RRM
Breakover Voltage Symmetry MAX. 3 V
Breakover Voltage, forward and reverse
MIN. 33
MAX. 43
Peak Breakover Current MAX. 25 uA
Trigger Firing Capacitance MAX. 0.1 µF
IT = 1.41 x I
V
/ V
DRM
A; tp = 380s MAX. 1.6 V
T(rms)
TJ = 25°C
RRM
= 100°C 500
J
= 125°C 2000
T
J
MAX.
10
V
µAT
Thermal Resistances
Symbol Parameter Value Unit
Qxx04LT 3.6
R
(J-C)
R
(J-A)
Note : xx = voltage
Junction to case (AC)
Junction to ambient 50 °C/W
Qxx06LT /
Qxx06LTH
Qxx08LT /
Qxx08LTH
Qxx10LT /
Qxx10LTH
Qxx15LT /
Qxx15LTH
3.3
2.8
2.6
2.1
°C/W
QxxxxLTx Series
171
Specifications are subject to change without notice.
©2013 Littelfuse, Inc
Revised: 09/23/13
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