Faster Switching from Standard Couplers

Optocouplers offer tremendous advantages in minimizing EMI and noise susceptibility. It is not an exaggeration to say that a healthy sprinkling of opto-isolation has often meant the difference between a “good idea” and working product. Yet, these very useful devices are often overlooked as possible solutions in designs because they are perceived to be “slow”. It is true that there are some limitations due to the inherent underlying technology involved in optocoupler manufacture. In spite of these limitations, with enlightened design principles, “standard” couplers can be used well into the microsecond range, or in the case of high-performance couplers, well into the realm of nanosecond switching times. Some of the higher-speed applications require specialized but widely available “high-speed” couplers. Vishay manufactures and sells high-speed couplers ranging from the 1 MBd range up to the 10 MBd range. These couplers can be used in applications were safety and/or noise isolation is required without sacrificing switching performance.