What this SPI isolator does on your board
The Analog Devices ADUM4152BRIZ-RL is a 7-channel SPI digital isolator from the iCoupler® and SPIsolator™ series, built with magnetic coupling technology. It isolates SPI bus signals across a 5000Vrms barrier while passing data at up to 34Mbps — fast enough for most ADCs, DACs, and sensor interfaces that talk SPI. The 7 channels are split 4 on side 1 and 3 on side 2, covering the typical SPI quad (SCLK, MOSI, MISO, CS) plus three extra control or interrupt lines, so you can often skip a second isolator package.
5000Vrms isolation — what it buys you
The 5000Vrms isolation rating is the spec that decides whether this part fits a motor-drive, inverter, or medical power-supply interface. That level of galvanic isolation protects low-voltage logic from high-voltage transients and ground loops common in industrial environments. The common-mode transient immunity of 25kV/µs (minimum) means the data link stays clean when switching IGBTs or MOSFETs slam the bus with fast voltage edges — a real concern in VFD and servo-drive designs.
34Mbps data rate and propagation delay
At 34Mbps the part handles SPI clock rates up to about 17 MHz (half-duplex) or full 34 Mbps in a 4-wire setup. Propagation delay is 14ns max each way, and pulse-width distortion stays under 2ns. That timing budget leaves room for a few inches of PCB trace plus the target device's setup/hold window. Rise and fall times are 2.5ns typical — fast enough to avoid slew-rate limiting at 34Mbps, but not so fast that they ring badly on a poorly terminated line.
Supply range and logic compatibility
The supply range of 3V to 5.5V on each side lets you run the isolator at 3.3V on the controller side and 5V on the peripheral side, or any mix in between. That answers the common question: yes, it is compatible with 3.3V logic — just power side 1 at 3.3V and side 2 at whatever the isolated domain needs. The channels are unidirectional, so you wire them according to the data direction (e.g., side 1 for SCLK and MOSI, side 2 for MISO).
Package and temperature grade
Housed in a 20-SOIC wide-body (7.50mm width) package, surface-mount. No isolated power converter on-chip — you supply the isolated rail externally or use a separate ADuM5xxx part if you need that.
Active lifecycle — no LTB worry
For a storeroom keeper: store the reels dry — MSL rating is typical for SOIC packages, but confirm the floor life on the reel label before reflow.