Four-channel capacitive isolator for industrial signal isolation
The Texas Instruments ISO7241ADWRG4 is a general-purpose digital isolator using capacitive coupling to provide galvanic isolation across four unidirectional channels. 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.
Temperature grade and package
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.
Lifecycle and sourcing posture
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.