Analog Devices Inc. ADUM3150BRSZ

Overview

ADuM3150BRSZ from Analog Devices is a 6-channel, 3.75 kV rms reinforced digital isolator optimized for isolated SPI interfaces with delay clock support. It provides four high-speed SPI signal channels (MCLK, MO/SI, MI/SO, MSS) and two independent 250 kbps bidirectional data channels (VIA/VIB), enabling robust isolation in industrial PLCs and sensor systems operating up to 125°C.

For engineers reviewing the ADuM3150BRSZ datasheet, ADuM3150BRSZ pinout, ADuM3150BRSZ application, or ADuM3150BRSZ equivalent, key selection criteria include its 40 MHz delay-clock mode SPI timing, 14 ns high-speed propagation delay, 250 kbps low-speed channel capability, 25 kV/µs common-mode transient immunity, and 20-lead SSOP package with 5.1 mm creepage.

Technical Context

The ADuM3150BRSZ implements iCoupler® chip-scale transformer isolation across six independent channels: four dedicated to SPI bus signals (MCLK, MO/SI, MI/SO, MSS) and two general-purpose low-speed data channels (VIA, VIB). Its delay clock (DCLK) output on the main side enables 40 MHz SPI clock performance by compensating for propagation delays in the isolated path.

It supports mixed-voltage operation (3.3 V/5 V or 5 V/3.3 V), delivers ≤2.5 µs jitter on slow channels, and maintains <2 ns pulse width distortion on fast channels. The device meets reinforced insulation requirements per DIN EN IEC 60747-17 (VDE 0884-17) and UL 1577, with VIORM = 565 V peak and VISO = 3750 V rms for 1 minute.

Key Specifications

Pinout & Package

ADuM3150BRSZ uses a 20-lead SSOP package (5.1 mm creepage, 7.2 mm body width) with gull-wing leads and JEDEC MS-013AC footprint. Pin 1 is marked with a dot; pins 1–10 form the input/main-side bank, and pins 11–20 form the output/subordinate-side bank.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADuM3150BRSZ, ADuM3151BRSZ reduces cost by omitting delay-clock circuitry but forfeits 40 MHz capability, while ADuM4150BRWZ trades compact SSOP size for higher isolation rating and SOIC-W mechanical robustness-making ADuM3150BRSZ optimal for space-constrained 3.75 kV industrial SPI isolation.

Availability

ADuM3150BRSZ is available at Aetrix Electronics and suitable for industrial PLC backplanes, sensor interface modules, motor drive feedback systems, and isolated power telemetry requiring stable component supply across extended temperature and high-noise environments.

Supply support for ADuM3150BRSZ 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 ADuM3150BRSZ belongs to the SPIsolator™ family of digital isolators, designed specifically to solve timing-critical isolation challenges in serial peripheral interfaces while maintaining reinforced safety certification and high CMTI.

FAQ

What is the maximum SPI clock rate supported by the ADuM3150BRSZ?

The ADuM3150BRSZ supports up to 40 MHz SPI clock rate in delay clock (DCLK) mode, and up to 17 MHz in standard 4-wire SPI mode. This dual-mode capability is enabled by its internal delay-compensated clock generator, which aligns timing across the isolation barrier without external components. The 40 MHz mode is validated under 5 V operation with B-grade timing specifications.

Does the ADuM3150BRSZ support mixed supply voltages?

Yes, the ADuM3150BRSZ supports mixed-voltage operation: VDD1 and VDD2 can be independently set to either 3.3 V or 5 V. Valid configurations include 5 V/3.3 V and 3.3 V/5 V, enabling direct interfacing between 3.3 V microcontrollers and 5 V peripherals across the isolation barrier without level shifters.

How many isolation channels does the ADuM3150BRSZ provide, and what are their data rates?

The ADuM3150BRSZ provides six galvanically isolated channels: four high-speed SPI signal channels (MCLK, MO/SI, MI/SO, MSS) rated for up to 40 Mbps, and two independent low-speed bidirectional data channels (VIA/VIB ↔ VOA/VOB) operating at 250 kbps. All channels maintain reinforced 3.75 kV rms isolation.

What safety certifications apply to the ADuM3150BRSZ?

The ADuM3150BRSZ is certified to UL 1577 (3750 V rms for 1 minute), IEC/EN/CSA 62368-1, and DIN EN IEC 60747-17 (VDE 0884-17) for reinforced insulation. Its VIORM is 565 V peak, and it achieves 5.1 mm creepage in the 20-lead SSOP package, meeting industrial safety requirements for functional and basic insulation boundaries.

Can the ADuM3150BRSZ replace the ADuM3151BRSZ in an existing design?

The ADuM3150BRSZ is not a drop-in replacement for the ADuM3151BRSZ due to the presence of the DCLK pin (Pin 9), which is NC on ADuM3151BRSZ. While both share identical pinouts except for Pin 9, using ADuM3150BRSZ requires routing DCLK and updating firmware to leverage 40 MHz mode-otherwise, it operates functionally equivalent to ADuM3151BRSZ at 17 MHz.