4170Vrms isolation for industrial signal isolation
The CNY17F4SR2M from onsemi is a single-channel optoisolator rated for 4170Vrms of input-to-output isolation, which provides a reinforced safety barrier for separating high-voltage and low-voltage domains in motor drives, PLC I/O modules, and power supplies. With a DC input and a transistor output, it is a straightforward choice for digital or slow analog signal isolation where the 4µs rise and 3.5µs fall times are adequate for the switching frequency.
CTR range and drive margin
The current transfer ratio is specified between 160% and 320% at a forward current of 10mA, meaning the output transistor can sink up to 32mA from a 70V supply when the input LED is driven at 10mA. This wide CTR range gives the designer headroom for LED degradation over temperature and lifetime, ensuring the output still saturates at the end of the product's service life.
Temperature grade and environment fit
Rated for operation from -40°C to 100°C, the CNY17F4SR2M covers industrial and outdoor equipment where ambient temperatures can swing widely, such as in factory automation or solar inverter control boards. The ROHS3 compliance and surface-mount gull-wing package simplify compliance with global environmental regulations and standard reflow soldering profiles.