Analog Devices Inc. ADUM3153ARSZ-RL7

Overview

ADUM3153ARSZ-RL7 from Analog Devices is a 7-channel, 3.75 kV reinforced digital isolator optimized for SPI bus isolation. It integrates four high-speed SPI signal channels (MCLK, MO/SI, MI/SO, MSS) supporting up to 17 MHz clock rate with 14 ns propagation delay and 1 ns jitter, plus three independent 250 kbps low-speed data channels (VIA/VIB/VIC), all in a 20-lead SSOP package rated for 125°C operation. It enables robust isolated communication between microcontrollers and isolated ADCs or DACs in industrial PLCs.

For engineers reviewing the ADUM3153ARSZ-RL7 datasheet, ADUM3153ARSZ-RL7 pinout, ADUM3153ARSZ-RL7 application, or ADUM3153ARSZ-RL7 equivalent, key selection criteria include its 17 MHz SPI clock support, 250 kbps auxiliary channel capability, 3.75 kV rms isolation rating, 25 kV/µs common-mode transient immunity, and compatibility with mixed 3.3 V/5 V supply configurations across the isolation barrier.

Technical Context

The ADUM3153ARSZ-RL7 implements iCoupler® chip-scale transformer technology to achieve galvanic isolation without optocouplers or external magnetics. Its four high-speed channels use dedicated bidirectional transformers with precise timing control, delivering 14 ns propagation delay and ≤2 ns pulse width distortion at 17 MHz.

The three low-speed channels (VIA/VIB/VIC) operate via time-division multiplexed sampling at 250 kbps with 2.5 µs jitter and support configurable directionality. All channels maintain reinforced insulation per DIN EN IEC 60747-17 (VDE 0884-17), with VIORM = 565 V peak and certified 3750 V rms withstand voltage for 1 minute.

Key Specifications

Pinout & Package

ADUM3153ARSZ-RL7 is housed in a 20-lead SSOP package (5.1 mm creepage) with gull-wing leads and exposed thermal pad. Pin assignments follow the ADuM3153 functional block diagram: Side 1 (pins 1–8, 19–20) contains MCLK, MO, MSS, VIA, VIB, VIC, VDD1, GND1; Side 2 (pins 9–18) contains SCLK, SI, SSS, VOA, VOB, VOC, VDD2, GND2, MI, SO.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM3153ARSZ-RL7, ADUM3150ARSZ-RL7 reduces auxiliary channel count while retaining full SPI functionality, whereas ISO6741QDWR offers higher raw speed but demands additional design effort to replicate ADUM3153ARSZ-RL7's integrated SPI timing control and auxiliary channel architecture.

Availability

ADUM3153ARSZ-RL7 is available at Aetrix Electronics and suitable for industrial PLC backplanes, isolated sensor interfaces, motor drive control boards, and energy meter communication modules requiring stable component supply and long-term lifecycle assurance.

Supply support for ADUM3153ARSZ-RL7 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 ADuM3153ARSZ-RL7 belongs to the SPIsolator™ family, engineered specifically to simplify isolated SPI implementation by integrating protocol-aware timing, glitch filtering, and multi-channel flexibility into a single reinforced-isolation package.

FAQ

What is the maximum SPI clock frequency supported by the ADUM3153ARSZ-RL7?

The ADUM3153ARSZ-RL7 supports up to 17 MHz SPI clock rate under 5 V operation, with guaranteed timing performance including 14 ns propagation delay and ≤2 ns pulse width distortion. At 3.3 V operation, the maximum clock rate is 12.5 MHz, and in mixed-supply configurations (e.g., 5 V/3.3 V), it operates up to 15.6 MHz - all verified across −40°C to +125°C.

Does the ADUM3153ARSZ-RL7 support mixed-voltage operation between its two sides?

Yes, the ADUM3153ARSZ-RL7 fully supports mixed-voltage operation: it is characterized for VDD1 = 5 V / VDD2 = 3.3 V and VDD1 = 3.3 V / VDD2 = 5 V configurations. DC thresholds scale with respective supply voltages (VIH = 0.7 × VDDx), and timing specifications remain valid, enabling direct interfacing between 3.3 V microcontrollers and 5 V isolated peripherals without level shifters.

How many isolated channels does the ADUM3153ARSZ-RL7 provide, and what are their data rates?

The ADUM3153ARSZ-RL7 provides seven isolated channels: four high-speed SPI signal channels (MCLK, MO, MSS, and SI/SO pair) operating up to 34 Mbps, and three low-speed unidirectional auxiliary channels (VIA, VIB, VIC) each rated for 250 kbps. All channels maintain reinforced 3750 V rms isolation and share the same 20-lead SSOP package.

What safety certifications does the ADUM3153ARSZ-RL7 hold?

The ADUM3153ARSZ-RL7 is certified to UL 1577 (3750 V rms, 1 min), IEC/EN/CSA 62368-1 (basic insulation), and DIN EN IEC 60747-17 (VDE 0884-17) for reinforced insulation, with VIORM = 565 V peak and VIOWM = 400 V rms. It also meets pollution degree 2 and climatic classification 40/105/21 per IEC 60664-1 and DIN VDE 0110.

Can the ADUM3153ARSZ-RL7 replace optocoupler-based SPI isolation solutions?

Yes, the ADUM3153ARSZ-RL7 is designed as a drop-in replacement for discrete optocoupler-based SPI isolators. Its iCoupler® technology eliminates LED aging, provides superior CMTI (>25 kV/µs vs. typical 1–5 kV/µs for optos), achieves tighter timing (14 ns vs. >100 ns propagation), and integrates all seven channels in one SSOP package - reducing PCB area, bill-of-materials, and qualification effort versus multi-component opto solutions.