Power Electronics

Zero Crossing Phototriacs Control AC Voltages

Vishay Intertechnology Inc. has announced the VO3062 and VO3063, two zero crossing 1.5-kV/µs dV/dt phototriacs designed to isolate low-voltage logic from ac voltages up to 380 V. The VO3062 and VO3063 are designed for control of resistive, inductive or capacitive loads, including motors, solenoids, high-current thyristors and relays. Optimized for noisy environments, typical applications for the new devices include refrigerators, air conditioners (HVAC), dishwashers, vending machines, industrial controls, ac motor drives, switches, switching power supplies and solenoid/valve controls.

The phototriacs consist of a GaAs infrared LED that is optically coupled to a monolithic photosensitive zero crossing triac detector chip. A low-input trigger current facilitates an easy interface with microcontrollers and digital logic. The VO3063 requires a maximum trigger current of 5 mA to latch output; the VO3062 requires a maximum trigger current of 10 mA. Rated with a 600-V blocking voltage, the phototriacs provide isolation between dc and ac voltages on 120-V, 240-V and 380-V ac lines, giving designers a 2X or better safety factor for control of off-line voltages up to 240 V.

The VO3062 and VO3063 are direct replacements for industry-standard 1.0-kV/µs dV/dt phototriacs. The devices are available in 6-pin DIP, 400-mil DIP and SMD packages. Samples and production quantities of the new phototriacs are available now, with lead times of six to eight weeks for larger orders. Pricing for 10,000-piece quantities starts at $0.85 per piece, depending on the trigger current values.

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