What this part does on your board
The ADUM5402WCRWZ-1RL is a quad-channel digital isolator from Analog Devices that integrates an isolated DC-DC converter on-chip — the IsoPower® and iCoupler® technology. It provides 2500Vrms galvanic isolation across four unidirectional channels, with two channels going each direction (inputs side 1/side 2: 2/2).
25 Mbps data rate and signal timing — what matters for the bus
With a 25 Mbps data rate and typical rise/fall times of 2.5 ns, this part handles SPI, UART, and general-purpose digital signalling cleanly. The 60 ns max propagation delay (tpLH/tpHL) is symmetric, which simplifies timing closure in bidirectional handshake lines. The 6 ns max pulse-width distortion means the duty cycle stays tight — important for PWM-like signals where edge symmetry matters. Common-mode transient immunity is rated at 25 kV/µs minimum, so it holds its state through fast voltage transients common in motor-drive and automotive 48 V bus environments.
Power supply and voltage range
The integrated isolated DC-DC converter generates a regulated output on the isolated side, so you don't need a separate transformer or isolated module for low-power side supplies — it's all in the 16-SOIC. That saves board area and BOM count in applications like isolated sensor interfaces or CAN/RS-485 transceiver power.
Automotive grade and temperature range
This part carries an Automotive grade designation, meaning it is qualified for the reliability and temperature demands of automotive applications.
Package and rework notes
The wide-body SOIC has enough pin pitch and thermal mass that a hot-air station at 300°C to 320°C with a fine nozzle lifts it cleanly — just preheat the board to 100°C to avoid pad lift on the inner rows.