Littelfuse, Inc. today introduced six series of high-temperature sensitive, standard and alternistor TRIACs, designed for use as semiconductor switches in appliances and equipment powered by line AC voltages up to 220 VRMS. Available in compact, surface-mount packages, these components are the industry’s first TRIAC 
Source: Littelfuse, Inc.with such a high maximum temperature available in ratings of 4 A, 6 A and 8 A. This combination of space-saving packaging, high temperature capabilities and choice of current ratings makes them well-suited for internet of things (IoT) applications that require compact design but don’t involve continuous high currents such as smart doorbells, thermostats, ceiling fans and lights, and door locks.
The sensitive-type components guarantee low current gate control in Quadrants I and IV to interface directly with digital control circuitry. Standard-type components normally operate in Quadrants I and III and are triggered from the AC line. Alternistor-type components only operate in Quadrants I, II and III, are triggered from the AC line, and are used in circuits requiring high dv/dt capability. With a maximum junction temperature of 150° C, these components help circuit designers facing thermal management issues due to limited or no heat sinking by providing a larger thermal design margin. Their high surge capabilities simplify handling cold in-rush currents in heater or motor control applications.
Availability
High-temperature sensitive, standard and alternistor TRIACs are available in TO-251 (VPAK) or TO-252 (DPAK) packages in tube pack (75 per tube) in quantities of 750 or in embossed carriers in quantities of 2,500. Sample requests may be placed through authorized Littelfuse distributors worldwide. For a listing of Littelfuse distributors, please visit Littelfuse.com.
For More Information
Additional information is available on the:
- LJxx04xx Series and QJxx04xx Series 4 Amp High-Temperature Sensitive and Standard TRIAC product page
- LJxx06xx Series and QJxx06xHx Series 6 Amp High-Temperature Sensitive and Alternistor (High Commutation) TRIAC product page
- LJxx08xx Series and QJxx08xHx Series 8 Amp High-Temperature Sensitive and Alternistor (High Commutation) TRIAC product page
