Vishay introduces off-state voltage 800V optocoupler

     Vishay further expands its optoelectronics portfolio with the introduction of two optical thyristor output optocouplers, both in compact flat SOP-4 packages -VOT8024AM and VOT8121AM. Vishay Semiconductors VOT8024AM and VOT8121AM have high stability and noise isolation with 800 V off-state voltage and 1000 V/μs dV/dt, suitable for household appliances and industrial equipment.

     The optocoupler isolates low-voltage logic for 120 VAC, 240 VAC, and 380 VAC lines and controls resistive, inductive, or capacitive loads, including motors, solenoid valves, high-current thyristors, or TRIacs, and relays. Both devices are composed of GaAs infrared leds that can be optically coupled to zero-cross TRIAC (VOT8024AM) to reduce EMI without the need for an external buffer network. Random phase TRIAC (VOT8121AM) can also be connected to enable phase-independent switching, thereby reducing design costs and saving board space.

     The high off-state voltage of the VOT8024AM and VOT8121AM improves the safety margin for single-phase applications while maintaining sufficient voltage margin for three-phase applications. For added safety, both optocouplings withstand 3750 VRMS isolation voltages. The 5mA low trigger current of the VOT8024AM and the 10mA low trigger current of the VOT8121AM facilitate connection to the digital logic interface.

     Both optocouplings are RoHS compliant and typical applications include power TRIAC drivers in solid state relays, three-phase air conditioners, boilers, thermostats, industrial motor controls and power line switches, and motor, light and valve controls in household appliances.