Optoelectronics

Optocouplers cut design costs and save board space

20th May 2019
Mick Elliott

Broadening its optoelectronics portfolio Vishay Intertechnology has released two series of optocouplers with phototriac output in space-saving compact DIP-4 and SMD-4 packages. Featuring a high off state voltage of 800V and dV/dt of 1000V/μs, Vishay Semiconductors' VOT8024A and VOT8121A series deliver high robustness and noise isolation for home appliances and industrial equipment.

The optocouplers isolate low voltage logic from 120VAC, 240VAC, and 380VAC lines to control resistive, inductive, or capacitive loads, including motors, solenoids, high current thyristors, or TRIACs and relays.

Reducing design costs and saving board space, the devices consist of a GaAs infrared LED optically coupled to either a zero-crossing TRIAC (VOT8024A series) for EMI reduction without the need for external snubber networks, or a random-phase TRIAC (VOT8121A series) to enable phase-independent switching.

The high off-state voltages of both the VOT8024A and VOT8121A series enhance safety margins in one-phase applications while maintaining enough voltage headroom for three-phase applications.

For additional safety, the optocouplers offer a withstanding isolation voltage of 5000VRMS. Low trigger currents of 5mA for the VOT8024A series and 10mA for the VOT8121A series 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.

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