Four-channel capacitive isolator for industrial signal isolation
It is designed to pass digital signals at data rates up to 1Mbps while withstanding 4000Vpk isolation voltage, making it a fit for breaking ground loops in industrial control interfaces, PLC I/O modules, motor drive feedback paths, and isolated SPI or UART links. The supply range from 3.15V to 5.5V lets it operate on either a 3.3V or 5V logic rail without an external level translator.
The 4000Vpk isolation rating covers reinforced-grade separation for equipment connected to mains or motor-drive power stages. The 25kV/µs minimum common-mode transient immunity ensures the output does not glitch when a fast voltage transient jumps across the isolation barrier — a common failure mode in inverter-driven environments. Combined with a 95ns max propagation delay and 10ns pulse-width distortion, this part preserves signal timing within a few tens of nanoseconds, which is sufficient for most 1Mbps serial links but not for high-speed parallel buses.
Channel assignment and unidirectional flow
The four channels are configured as three inputs on side 1 and one input on side 2, all unidirectional. This fixed direction suits applications like isolated SPI where the clock, MOSI, and chip-select travel from the controller to the peripheral (three channels) and MISO returns (one channel). It does not support bidirectional data lines such as I²C SDA without external direction control.
It comes in a 16-SOIC wide-body package (7.50mm width), which provides the creepage distance needed to sustain the 4000Vpk isolation rating across the PCB. The Tape & Reel (TR) packaging is the standard shipping form for automated pick-and-place assembly.
For dual-sourcing resilience, the base product number ISO7241 covers multiple speed and package variants within the same family — verify pin compatibility with the specific suffix when qualifying an alternate.