Active SPI isolator with 7 channels and 34 Mbps throughput
It is rated for 3750Vrms isolation voltage and supports a data rate of 34Mbps, which accommodates SPI clock speeds up to the full 34 MHz without adding bus dead cycles.
Channel configuration and signal mapping
With 7 unidirectional channels arranged as 4 inputs on side 1 and 3 inputs on side 2, the ADUM3152BRSZ can isolate a full SPI bus — SCLK, MOSI, MISO, and up to four chip-select lines — while keeping the direction fixed. This avoids the bus-turnaround overhead of bidirectional isolators and simplifies firmware timing. The 2.5ns typical rise/fall time and 14ns max propagation delay leave healthy margin for SPI timing closure at 34 Mbps.
Industrial temperature range and common-mode transient immunity
The minimum common-mode transient immunity of 25kV/µs means it holds data integrity through fast voltage transients from switching power stages or relay contact arcs — a spec that matters more than the headline isolation voltage in noisy environments.
Supply voltage range and package
The part operates from 3V to 5.5V on each side independently, so it can bridge a 3.3V MCU domain to a 5V sensor or actuator side without a level shifter. It comes in a 20-SSOP package with a 5.30mm body width — a common footprint for multi-channel isolators, but verify the land pattern against your layout if migrating from an SOIC-16 part.