Analog Devices Inc. ADUM3472ARSZ

Overview

ADUM3472ARSZ from Analog Devices is a quad-channel digital isolator with integrated PWM controller and transformer driver for isolated dc-to-dc conversion. It delivers regulated 3.3 V to 24 V output at up to 2 W, supports 25 Mbps data rates (C grade), achieves 70% efficiency at 400 mA/5 V, and operates up to 105°C. It enables compact isolated power + signal transfer in industrial RS-485 transceivers.

For engineers reviewing the ADUM3472ARSZ datasheet, ADUM3472ARSZ pinout, ADUM3472ARSZ application, or ADUM3472ARSZ equivalent, this page provides verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternative parts with documented differences, and supply-ready availability details - all specific to the ADUM3472ARSZ variant.

Technical Context

The ADUM3472ARSZ integrates iCoupler® chip-scale transformers for galvanic isolation of four independent logic channels and a secondary-side-controlled PWM controller driving an external transformer to generate isolated bias power. Its oscillator frequency is adjustable from 200 kHz to 1 MHz via external resistor, and it includes soft-start, pulse-by-pulse overcurrent protection, and thermal shutdown.

It supports multiple input/output voltage configurations: 5 V primary / 5 V isolated, 5 V primary / 3.3 V isolated, 3.3 V primary / 3.3 V isolated, and 5 V primary / 15 V isolated. Feedback regulation uses a 1.25 V internal reference (±10% tolerance), and common-mode transient immunity exceeds 25 kV/µs on all channels.

Key Specifications

Pinout & Package

ADUM3472ARSZ is housed in a 20-lead SSOP (Shrink Small Outline Package) with 0.65 mm lead pitch, JEDEC MO-153 compliant, and rated for 105°C maximum junction temperature. The package provides reinforced insulation barrier between primary (pins 1–10) and secondary (pins 11–20) sides.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar isolated power + signal isolation applications.

Compared with ADUM3472ARSZ, ADUM3471ARSZ offers marginal quiescent current reduction but identical functionality, while ADUM4472ARIZ trades SSOP compactness for enhanced thermal and isolation margins - making ADUM3472ARSZ the optimal balance of size, performance, and cost for mainstream industrial designs.

Availability

ADUM3472ARSZ is available at Aetrix Electronics and suitable for industrial field bus isolation, automotive battery management systems, process control sensor interfaces, and power supply start-up bias applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADUM3472ARSZ 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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial automation, and communications infrastructure.

The ADuM347x product line delivers integrated isolated power and signal transfer for space-constrained, safety-critical systems - designed specifically to replace discrete isolator + DC/DC combinations in industrial and automotive subsystems.

FAQ

What is the maximum supported output voltage configuration for ADUM3472ARSZ?

ADUM3472ARSZ supports isolated output voltages from 3.3 V to 24 V, set via external resistor divider on the FB pin. Confirmed configurations include 3.3 V (±10%), 5.0 V (±10%), and 15 V (±10%) outputs, each with specified load current limits: 250 mA at 3.3 V, 400 mA at 5.0 V, and 100 mA at 15 V. The 24 V configuration requires external transformer redesign and is validated per Analog Devices Application Note AN-1261.

Does ADUM3472ARSZ require an external transformer, and what are its key specifications?

Yes, ADUM3472ARSZ requires an external center-tapped transformer driven by the TRN pin. Per the datasheet, recommended ET constant is 10–20 V·µs, primary inductance ≥200 µH, and isolation voltage ≥2500 V rms. Analog Devices provides reference transformers (e.g., Pulse Engineering PA0168ANL) and design guidelines in Application Schematic Figure 38 and Transformer Design section.

How does the ADUM3472ARSZ handle undervoltage lockout conditions?

ADUM3472ARSZ implements independent undervoltage lockout (UVLO) on both VDD1 and VDD2 supplies. The positive-going threshold is 2.8 V with 0.2 V hysteresis, and the negative-going threshold is 2.6 V. When either supply drops below UVLO, the PWM controller halts switching, outputs go high-impedance, and internal regulators disable - preventing erratic behavior during brownout conditions.

Can ADUM3472ARSZ operate with a 3.3 V primary supply and 5.0 V isolated output?

No - ADUM3472ARSZ does not support 3.3 V primary / 5.0 V isolated output. Valid combinations are explicitly listed: 5 V primary / 5 V isolated, 5 V primary / 3.3 V isolated, 3.3 V primary / 3.3 V isolated, and 5 V primary / 15 V isolated. Cross-voltage configurations like 3.3 V → 5 V are not characterized or guaranteed per Table 1–4 and General Description.

What safety certifications apply specifically to ADUM3472ARSZ?

ADUM3472ARSZ carries UL 1577 (2500 V rms, 1 min), DIN EN IEC 60747-17 (VDE 0884-17) reinforced insulation (560 V peak), IEC/EN/CSA 62368-1, IEC/CSA 61010-1, and CQC GB 4943.1. These are verified per Certificate No. 40011599 (VDE) and CQC17001164238, and the device bears the VDE 0884-17 asterisk marking on package.