
2002 Teccor Electronics
Thyristor Product Catalog
E3 - 1
http://www.teccor.com
+1 972-580-7777
U.L. RECOGNIZED
Fle #E71639
Internally Triggered Triacs (4 A to 15 A)
E3
General Description
Teccor’s 
Quadrac
 devices are triacs that include a diac trigger 
mounted inside the same package. This device, developed by 
Teccor, saves the user the expense and assembly time of buying 
a discrete diac and assembling in conjunction with a gated triac. 
Also, the alternistor 
Quadrac
 device (QxxxxLTH) eliminates the 
need for a snubber network.
The 
Quadrac
 device is a bidirectional AC switch and is gate con-
trolled
for either polarity of main terminal voltage. Its primary pur-
pose is for AC switching and phase control applications such as 
speed controls, temperature modulation controls, and lighting 
controls where noise immunity is required. 
Triac current capacities range from 4 A to 15 A with voltage 
ranges from 200 V to 600 V. 
Quadrac
 devices are available in the 
TO-220 package.
The TO-220 package is electrically isolated to 2500 V rms from 
the leads to mounting surface. 4000 V rms is available on special 
order. This means that no external isolation is required, thus 
eliminating the need for separate insulators and insulator-mount-
ing steps and saving dollars over “hot tab” devices.
All Teccor triac and diac chips have glass-passivated junctions to 
ensure long-term device reliability and parameter stability.
Variations of devices in this data sheet are available for custom 
design applications. Consult the factory for more information.
Features
Glass-passivated junctions
Electrically-isolated package
Internal trigger diac
High surge capability — up to 200 A
High voltage capability — 200 V to 600 V
TO-220
Isolated
MT2
MT1
T