Vishay Intertechnology, Inc has broadened its optoelectronics portfolio with the release of two new optocouplers with a phototriac output in the compact flat SOP-4 package. Featuring an off-state voltage of 800 V and dV/dt of 1000 V/μs, the Vishay Semiconductors VOT8024AM and VOT8121AM deliver high robustness and noise isolation for home appliances and industrial equipment.
The new optocouplers isolate low voltage logic from 120 V AC, 240 V AC and 380 V AC lines to control resistive, inductive or capacitive loads, including motors, solenoids, high-current thyristors or triodes for alternating current (TRIACs) and relays. Reducing design costs and board space, the devices consist of a gallium arsenide, infrared LED optically coupled to either a zero-crossing TRIAC (VOT8024AM) for EMI reduction without the need for external snubber networks, or a random-phase TRIAC (VOT8121AM) to enable phase-independent switching.
The high off-state voltage of the VOT8024AM and VOT8121AM enhances safety margins in one-phase applications, while still maintaining enough voltage headroom for three-phase applications. For additional safety, the optocouplers offer a withstanding isolation voltage of 3750 VRMS. Low trigger currents of 5 mA for the VOT8024AM and 10 mA for the VOT8121AM facilitate an easy interface with digital logic.
Typical applications for the RoHS-compliant optocouplers include power TRIAC drivers in solid-state relays, three-phase air conditioners, boilers, thermostats, industrial motor control and power line switching, and motor, lamp and valve control in household appliances.