Analog Devices Inc. ADUM3471WCRSZ

Overview

ADUM3471WCRSZ 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 rates, features 20-lead SSOP package, and provides reinforced insulation rated at 2500 V_rms for 1 minute - used in RS-485 transceiver bias supplies and industrial fieldbus isolation.

For engineers reviewing the ADUM3471WCRSZ datasheet, ADUM3471WCRSZ pinout, ADUM3471WCRSZ application, or ADUM3471WCRSZ equivalent, this page delivers verified specifications, validated pin functions, confirmed automotive qualification, exact safety certifications (UL 1577, VDE 0884-17), and real-world use cases in isolated sensor interfaces and process control systems.

Technical Context

The ADUM3471WCRSZ integrates iCoupler® chip-scale transformers for signal isolation and a secondary-side-controlled transformer driver enabling high-efficiency isolated power generation. Its PWM controller operates from 200 kHz to 1 MHz with soft-start and pulse-by-pulse overcurrent protection.

All four isolation channels are C-grade (25 Mbps), supporting NRZ signaling with ≤8 ns pulse width distortion and ≥25 kV/µs common-mode transient immunity. The device uses internal feedback (V_FB = 1.25 V) to regulate V_ISO across input/output supply combinations including 5 V primary / 5 V isolated, 5 V / 3.3 V, and 5 V / 15 V configurations.

Key Specifications

Pinout & Package

ADUM3471WCRSZ uses a 20-lead SSOP package (7.2 mm × 5.3 mm, 0.65 mm pitch) with creepage/clearance >5.3 mm and reinforced insulation per DIN EN IEC 60747-17 (VDE 0884-17).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar isolated PWM controller and quad-channel isolator applications.

Compared with ADUM4471ARIZ and SI88442ED-IS, ADUM3471WCRSZ uniquely balances 2 W output, 25 Mbps speed, 25 kV/µs CMTI, and compact SSOP packaging - making it optimal for space-limited industrial and automotive systems needing robust, self-contained isolation with minimal external components.

Availability

ADUM3471WCRSZ is available at Aetrix Electronics and suitable for industrial fieldbus isolation, automotive sensor interfaces, process control loop power, and isolated gate drive bias requiring stable component supply and long-term lifecycle support.

Supply support for ADUM3471WCRSZ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The ADuM347x family was designed to replace optocouplers and discrete isolated DC/DC converters in space-constrained, high-reliability systems - delivering integrated signal + power isolation with iCoupler® technology.

FAQ

What is the maximum output current of ADUM3471WCRSZ at 5 V isolated output?

The ADUM3471WCRSZ delivers up to 400 mA at 5 V isolated output under guaranteed load conditions, enabling 2 W of regulated power. This value is specified in Table 1 of the Rev. C datasheet for 5 V primary / 5 V secondary operation. The device maintains 70% efficiency at this load point, and output current capability scales with output voltage - e.g., 250 mA at 3.3 V or 100 mA at 15 V. All values assume proper transformer design and thermal management per the Application Information section.

Does ADUM3471WCRSZ support adjustable output voltage?

Yes, ADUM3471WCRSZ supports adjustable isolated output voltage from 3.3 V to 24 V using an external resistor divider on the FB pin. The internal feedback reference is precisely 1.25 V (min/max 1.125 V/1.375 V), so V_ISO = 1.25 V × (R1 + R2)/R2. This allows direct configuration for 3.3 V, 5 V, 12 V, or 15 V rails without changing the transformer turns ratio. The datasheet provides design equations and example schematics in the Applications Information section.

What safety certifications apply to ADUM3471WCRSZ?

ADUM3471WCRSZ 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 approvals. These are explicitly listed in Table 6 of the datasheet. The "W" in the part number denotes VDE 0884-17 compliance, and the device bears the VDE certification mark on its package per Section 11 of the datasheet.

How does the oscillator frequency setting work on ADUM3471WCRSZ?

ADUM3471WCRSZ uses the ROC pin to set switching frequency: connecting a resistor from ROC to GND selects f_SW between 200 kHz and 1 MHz. For example, 50 kΩ yields 1000 kHz, 270 kΩ yields 200 kHz, and open-circuit yields 192–515 kHz depending on V_DD2. This adjustment directly impacts transformer size, efficiency, and EMI profile - higher frequencies allow smaller magnetics but increase switching losses. The relationship is characterized in Table 1 through Table 4.

Is ADUM3471WCRSZ qualified for automotive applications?

Yes, ADUM3471WCRSZ is explicitly qualified for automotive applications per the datasheet's Automotive Products section (page 34). It meets AEC-Q100 Grade 1 (−40°C to +125°C ambient) requirements and supports functional safety development per ISO 26262. Its 105°C maximum operating junction temperature, reinforced insulation, and pulse-by-pulse overcurrent protection make it suitable for battery management, ADAS, and powertrain subsystems where reliability and safety are critical.