Optocouplers save space and isolate noise in industrial equipment

Optocouplers in space-saving DIP-4 and SMD-4 packages offer 800V off-state voltage for high robustness and noise isolation, says Vishay Intertechnology.

The VOT8024A and VOT8121A feature a high off-state voltage of 800V and dV/dt of 1000V/micro seconds, for robust noise isolation for home appliances and industrial equipment.

The optocouplers isolate low voltage logic from 120, 240 and 380V AC lines to control resistive, inductive, or capacitive loads, including motors, solenoids, high current thyristors, or TRIACs and relays. The devices can reduce design costs and save board space, using a GaAs infra red LED optically coupled to either a zero-crossing TRIAC (the VOT8024A series) for EMI reduction without the need for external snubber networks, or a random-phase TRIAC (the VOT8121A series) to enable phase-independent switching.

The high off-state voltages of both the VOT8024A and VOT8121A enhance safety margins in one-phase applications while maintaining enough voltage headroom for three-phase applications, explains Vishay. For additional safety, the optocouplers offer a withstanding isolation voltage of 5000V RMS. Low trigger currents of 5mA for the VOT8024A series and 10mA for the VOT8121A series provide 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.

Samples and production quantities of the VOT8024A and VOT8121A are available now, with lead times of six weeks.

Vishay Intertechnology manufactures discrete semiconductors (diodes, MOSFETs, and infrared optoelectronics) and passive electronic components (resistors, inductors, and capacitors), for use in industrial, computing, automotive, consumer, telecommunications, military, aerospace, power supplies, and medical products and equipment.


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