Built for heat and low power, these optocouplers run up to 125°C, use less current, and keep signals accurate in control and power designs.
Vishay Intertechnology has launched the VOx619A series, a new line of phototransistor optocouplers designed to deliver a stable current transfer ratio (CTR) across temperature while operating at a low forward current of 0.5 mA. The devices support temperatures up to +125 °C and target energy-efficient and accurate signal isolation in industrial systems.
The main improvement is lower power consumption. The series requires 50% less forward current than the previous generation. This helps reduce overall system power, especially in designs such as micro mobility systems, industrial controls, energy meters, telecom equipment, and consumer electronics. The optocouplers are intended for signal transmission with galvanic and noise isolation in DC/DC converters, programmable logic controllers, and power supplies. They also work well with microcontrollers and other devices that have limited current drive capability.
Performance over temperature is another key change. In many traditional optocouplers, CTR can fall below 50% of its specified value at 25 °C. In this series, CTR remains above 75% of its specified value across the full operating range. This more linear behavior helps maintain signal accuracy in applications that depend on stable data transfer. The extended temperature rating of +125 °C also exceeds the +110 °C range of earlier solutions and the +85 °C rating common in standard devices.
The series uses an infrared LED optically coupled to a phototransistor. It is offered in four package options: DIL-4, long creepage LSOP-4, SOP-4, and half-pitch SSOP-4. The DIL-4 and LSOP-4 versions provide up to 5000 VRMS isolation, with creepage and clearance distances of at least 7 mm and 8 mm. The smaller SOP-4 and SSOP-4 packages offer 3750 VRMS isolation with at least 5 mm creepage and clearance, helping save board space where needed. All devices are RoHS-compliant, halogen-free, and meet Vishay Green standards.
