Analog Devices Inc. ADUM3154BRSZ

Overview

ADUM3154BRSZ from Analog Devices is a 3.75 kV reinforced isolation, 7-channel digital isolator optimized for SPI bus isolation with support for up to four subordinate devices. It delivers 17 MHz SPI clock speed, <14 ns propagation delay on high-speed channels (MCLK/MO/MI/SO), and 250 kbps address bus (SSA0/SSA1) for subordinate selection - enabling robust isolated communication in industrial PLC backplanes and sensor interface modules.

For engineers reviewing the ADUM3154BRSZ datasheet, ADUM3154BRSZ pinout, ADUM3154BRSZ application, or ADUM3154BRSZ equivalent, this page provides verified technical context, real-world timing constraints, safety-certified insulation parameters, and validated alternative options for multi-subordinate SPI isolation designs.

Technical Context

The ADUM3154BRSZ implements iCoupler® chip-scale transformer isolation across two independent domains: four high-speed bidirectional SPI signal channels (MCLK, MO, MI, SO) and three low-speed subordinate select lines (SS0–SS3) routed via a 250 kbps address bus (SSA0/SSA1). Its architecture enforces strict timing control - MSS setup time as low as 1.5 ns ensures subordinate select propagation within 2.5 µs of address change.

It supports mixed-voltage operation (3.3 V/5 V or 5 V/3.3 V), maintains >25 kV/µs common-mode transient immunity, and guarantees DC correctness under magnetic field exposure per Analog Devices' iCoupler specifications. The device operates from −40°C to +125°C with UVLO at 2.6 V on both sides.

Key Specifications

Pinout & Package

ADUM3154BRSZ is housed in a 20-lead SSOP package with 5.1 mm creepage and clearance, rated for 3.75 kV rms isolation. Pin 1–10 form Side 1 (controller side); Pin 11–20 form Side 2 (subordinate side).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SPI isolator applications.

Compared with ADUM3154BRSZ, ADUM3153BRSZ reduces channel count and subordinate support but lowers BOM cost for simpler topologies, while ADUM4154BRIZ trades package compatibility (SOICW vs. SSOP) for higher safety margins - making it suitable for Class I medical or 600 VAC industrial mains interfaces.

Availability

ADUM3154BRSZ is available at Aetrix Electronics and suitable for industrial programmable logic controllers (PLCs), isolated sensor interface modules, and programmable power supply control systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for ADUM3154BRSZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The ADuM3154 product line delivers SPI-specific digital isolation using iCoupler technology - designed explicitly for deterministic, multi-peripheral SPI communication in harsh industrial environments.

FAQ

What is the maximum supported SPI clock frequency for ADUM3154BRSZ?

The ADUM3154BRSZ supports up to 17 MHz SPI clock frequency under 5 V operation, with typical propagation delay of 12–14 ns on MCLK, MO, MI, and SO channels. This value drops to 12.5 MHz at 3.3 V operation, and remains at 15.6 MHz in mixed-voltage configurations (5 V/3.3 V or 3.3 V/5 V). All values are specified with CL = 15 pF and CMOS-level signaling.

How many subordinate SPI devices can ADUM3154BRSZ support?

The ADUM3154BRSZ supports up to four subordinate SPI devices via its integrated 2-bit address decoder (SSA0/SSA1) and four dedicated SSx outputs (SS0–SS3). Selection occurs in ≤2.5 µs after address update, and the MSS signal provides glitch-filtered priority control to ensure correct timing alignment with clock/data edges.

Does ADUM3154BRSZ require external components for basic operation?

Yes - ADUM3154BRSZ requires a 0.1 µF ceramic bypass capacitor from each VDD pin (VDD1 and VDD2) to its respective ground (GND1/GND2). No pull-up/pull-down resistors are needed on signal pins, as internal hysteresis (500 mV) and CMOS-compatible thresholds (VIH = 0.7×VDDx, VIL = 0.3×VDDx) ensure robust noise immunity without external biasing.

What safety certifications apply to ADUM3154BRSZ?

ADUM3154BRSZ is certified to UL 1577 (3750 V rms, 1 min), CSA/IEC/EN 62368-1 (basic insulation, 510 V rms), and DIN EN IEC 60747-17 (VDE 0884-17) for reinforced insulation (VIORM = 565 V peak). It carries VDE certificate No. 40011599 and UL file E214100, with production-tested partial discharge <5 pC at 1059 V peak.

Can ADUM3154BRSZ operate with different supply voltages on each side?

Yes - ADUM3154BRSZ supports mixed-voltage operation: VDD1 and VDD2 may be independently set to 3.3 V or 5 V. Electrical characteristics are fully specified for 5 V/5 V, 3.3 V/3.3 V, 5 V/3.3 V, and 3.3 V/5 V configurations, with SPI clock rates of 17 MHz, 12.5 MHz, and 15.6 MHz respectively - enabling seamless interfacing between legacy 5 V peripherals and modern 3.3 V controllers.