Analog Devices Inc. ADUM3471ARSZ-RL7

Overview

ADUM3471ARSZ-RL7 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 5 V isolated output at up to 400 mA (2 W), supports 25 Mbps data rate (C grade), features 20-lead SSOP package, and provides 25 kV/µs common-mode transient immunity. It enables compact isolated power + signal transfer in industrial fieldbus interfaces.

For engineers reviewing the ADUM3471ARSZ-RL7 datasheet, ADUM3471ARSZ-RL7 pinout, ADUM3471ARSZ-RL7 application, or ADUM3471ARSZ-RL7 equivalent, key selection criteria include isolated output voltage range (3.3–24 V), guaranteed 400 mA load at 5 V, 20-lead SSOP footprint, C-grade 25 Mbps channel performance, and regulatory compliance including UL 1577 (2500 V rms) and VDE 0884-17 (560 V peak).

Technical Context

The ADUM3471ARSZ-RL7 integrates iCoupler® chip-scale transformers for galvanic isolation of four logic channels and a secondary-side-controlled PWM controller driving an external transformer to generate isolated dc power. Its oscillator frequency is adjustable from 200 kHz to 1 MHz via external resistor, and it implements pulse-by-pulse overcurrent protection and thermal shutdown.

It operates with primary supply options of 3.3 V or 5 V, supports multiple isolated output voltages (3.3 V, 5 V, 15 V, up to 24 V), and maintains regulation across line (±10 mV/V) and load (≤2%) variations. The device uses internal feedback (1.25 V setpoint) and achieves 70% efficiency at full 400 mA load on 5 V output.

Key Specifications

Pinout & Package

ADUM3471ARSZ-RL7 is housed in a 20-lead SSOP (Shrink Small Outline Package) with 0.65 mm lead pitch, optimized for high-density PCB layouts and automated assembly. Thermal resistance θ_JA is 50.5°C/W on a 4-layer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM3471ARSZ-RL7, ADUM4471ARIZ-RL offers higher temperature and isolation ratings but requires SOIC-20 layout revision, while SI88642EC-IS eliminates the transformer but trades off common-mode transient immunity and uses capacitive rather than magnetic isolation.

Availability

ADUM3471ARSZ-RL7 is available at Aetrix Electronics and suitable for industrial fieldbus isolation, automotive onboard charger control, isolated sensor interfaces, and process control loop isolation requiring stable component supply and long-term lifecycle support.

Supply support for ADUM3471ARSZ-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 ADuM347x product line delivers integrated isolated power and signal transfer solutions targeting space-constrained, safety-critical systems where reliability, regulatory compliance, and reduced system-level complexity are essential.

FAQ

What output voltage options does the ADUM3471ARSZ-RL7 support?

The ADUM3471ARSZ-RL7 supports adjustable isolated output voltages from 3.3 V to 24 V using an external resistor divider on the FB pin. Its internal 1.25 V reference enables precise regulation; typical configurations include 3.3 V, 5.0 V (default), and 15 V outputs. The datasheet specifies guaranteed performance at 3.3 V, 5.0 V, and 15 V with corresponding maximum load currents of 250 mA, 400 mA, and 100 mA respectively.

Does the ADUM3471ARSZ-RL7 require an external transformer?

Yes, the ADUM3471ARSZ-RL7 requires an external transformer to implement the isolated dc-to-dc converter. It integrates a transformer driver and secondary-side PWM controller but does not include magnetics. The datasheet provides detailed guidance on ET constant, turns ratio, primary inductance, and isolation voltage requirements for compatible transformers used with ADUM3471ARSZ-RL7.

What is the maximum data rate supported by the ADUM3471ARSZ-RL7?

The ADUM3471ARSZ-RL7 is a C-grade device supporting up to 25 Mbps per channel (NRZ) with propagation delay of 30–60 ns and pulse width distortion ≤8 ns. This is confirmed in Table 1 (Rev. C datasheet) under "25 Mbps Data Rate (C Grade Only)" and applies to all four isolation channels simultaneously under specified load conditions (CL = 15 pF, f = 12.5 MHz).

How is the switching frequency set on the ADUM3471ARSZ-RL7?

The switching frequency of the ADUM3471ARSZ-RL7 is set via an external resistor (ROC) connected between the ROC pin and GND2. Values from 50 kΩ yield ~1 MHz, while 270 kΩ yields ~200 kHz. The datasheet specifies operational range as 192–515 kHz (open-loop) and confirms 200 kHz to 1 MHz adjustability - critical for optimizing transformer size, efficiency, and EMI in ADUM3471ARSZ-RL7 designs.

Is the ADUM3471ARSZ-RL7 qualified for automotive applications?

Yes, the ADUM3471ARSZ-RL7 is explicitly qualified for automotive applications per the datasheet's "Automotive Products" section (page 34) and meets AEC-Q100 stress test requirements. It supports operation from −40°C to +105°C, includes thermal shutdown and overcurrent protection, and holds safety certifications (UL, VDE, CQC) required for automotive subsystems such as onboard chargers and battery management interfaces.