High-Temperature TRIAC improves thermal management in the smart home

Six high-temperature sensitive, standard and alternistor TRIACs from Littelfuse are designed for use as semiconductor switches in appliances and equipment powered by line AC voltages up to 220V RMS.

The TRIACs are claimed to be the first with such a high maximum temperature that are available in ratings of four, six and 8.0A. The are available in compact, surface-mount packages, and this combination of space-saving packaging, high temperature capabilities and choice of current ratings makes the 110V AC devices well-suited for internet of things (IoT) applications that require compact design but do not involve continuous high currents such as smart doorbells, thermostats, ceiling fans/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, and are triggered from the AC line. They are used in circuits requiring high dv/dt capability. With a maximum junction temperature of 150 degrees C, the TRIACs provide circuit designers a larger thermal design margin to address thermal management issues due to limited or no heat sinking. High surge capabilities simplify handling cold in-rush currents in heater or motor control applications.

“The combination of the robust clip-attach assembly design and the maximum operating junction temperature ensures the high surge capability needed to withstand short-duration overload conditions,” said Koichiro Yoshimoto, business development manager, Semiconductor Business Unit at Littelfuse.

The 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 authorised Littelfuse distributors worldwide.

Founded in 1927, Littelfuse is the global leader in circuit protection with advancing platforms in power control and sensor technologies. The company serves customers in the electronics, automotive and industrial markets with products that include fuses, semiconductors, polymers, ceramics, relays and sensors.


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