Phototriac optocouplers suit noisy environs

Vishay Intertechnology Inc. has announced two non-zero-crossing 1.5-kV/?s dV/dt phototriac optocouplers designed to isolate low-voltage logic from AC voltages up to 380V.

The VO3052 and VO3053 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 MCUs and digital logic. The VO3053 requires a maximum trigger current of 5mA to latch output, while the VO3052 requires a maximum trigger current of 10mA. The devices are offered in the 6-pin DIP package.

Better safety factor
Rated with a 600V blocking voltage, the phototriacs can provide isolation between DC and AC voltages on 120V and 240V AC lines, giving designers a 2X or better safety factor for control of off-line voltages up to 240V.

The VO3052 and VO3053 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 devices include refrigerators, air conditioners (HVAC), dishwashers, vending machines, industrial controls, AC motor drives, switches, switching power supplies and solenoid/valve controls.

Samples and production quantities of these phototriacs are available today, with lead times of six to eight weeks for larger orders.