Analog Devices Inc. ADUM3473CRSZ

Overview

ADuM3473CRSZ 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 rate (C grade), achieves 70% efficiency at 400 mA/5 V output, and operates up to 105°C. It enables compact isolated power + signal transfer in industrial RS-485 transceivers.

For engineers reviewing the ADuM3473CRSZ datasheet, ADuM3473CRSZ pinout, ADuM3473CRSZ application, or ADuM3473CRSZ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed automotive-qualified isolation performance, and two rigorously cross-checked alternative parts for system-level selection.

Technical Context

The ADuM3473CRSZ 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 implements pulse-by-pulse overcurrent protection plus thermal shutdown.

It supports multiple input/output voltage configurations: 5 V primary / 5 V isolated, 5 V / 3.3 V, 3.3 V / 3.3 V, and 5 V / 15 V outputs - each with distinct maximum load current (e.g., 400 mA at 5 V, 250 mA at 3.3 V, 100 mA at 15 V) and corresponding efficiency maintained at ≥70%. The C-grade variant guarantees 25 Mbps data rate with ≤8 ns pulse width distortion.

Key Specifications

Pinout & Package

ADuM3473CRSZ uses a 20-lead SSOP package (5.3 mm × 7.2 mm, 0.65 mm pitch) with creepage/clearance >5.3 mm between input and output sides per IEC 60747-17.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar isolated PWM controller + signal isolator applications.

Compared with ADuM4471CRIZ and Si88442CC-IS, ADuM3473CRSZ delivers optimal integration density and cost-efficiency for 2 W industrial isolation needs - combining certified reinforced insulation, 25 Mbps signaling, and transformer driver in a compact SSOP package without requiring external power stage components.

Availability

ADuM3473CRSZ is available at Aetrix Electronics and suitable for industrial field bus isolation, automotive BMS communication, isolated sensor interfaces, and process control loop designs requiring stable component supply across multi-year production cycles.

Supply support for ADuM3473CRSZ 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 since 1965.

The ADuM347x family was designed to replace optocouplers and discrete isolated power solutions in space-constrained, noise-immune industrial and automotive systems - delivering integrated signal + power isolation with regulatory-certified reliability.

FAQ

What is the maximum output current supported by ADuM3473CRSZ at 5 V isolated output?

ADuM3473CRSZ delivers up to 400 mA at 5 V isolated output under guaranteed load conditions, achieving ≥70% efficiency. This value is specified in Table 1 of the Rev. C datasheet for 5 V primary / 5 V secondary operation. At higher output voltages (e.g., 15 V), maximum current drops to 100 mA due to fixed 2 W power limit. The ADuM3473CRSZ datasheet confirms this performance across temperature and line/load regulation tests.

Does ADuM3473CRSZ support 3.3 V primary-side operation?

Yes, ADuM3473CRSZ supports 3.0–3.6 V primary supply (VDD1) with corresponding 3.3 V isolated output (VISO). In this mode, it delivers up to 250 mA at 70% efficiency (Table 2). Input thresholds adjust accordingly (VIH = 1.6 V min), and quiescent current drops to 9–11 mA (IDD1(Q)), making ADuM3473CRSZ suitable for low-power microcontroller-based systems.

How does the ROC pin set switching frequency in ADuM3473CRSZ?

The ROC pin connects to a resistor to ground to program the internal oscillator frequency from 200 kHz to 1 MHz. A 50 kΩ resistor yields 1000 kHz, while 270 kΩ yields 200 kHz (Table 1). This direct resistor control simplifies EMI tuning and transformer design - unlike voltage-controlled oscillators, ROC provides stable, temperature-invariant frequency setting critical for consistent isolated power performance in ADuM3473CRSZ.

What safety certifications apply to ADuM3473CRSZ?

ADuM3473CRSZ holds UL 1577 (2500 V rms, 1 min), DIN EN IEC 60747-17 (VDE 0884-17, 560 V peak reinforced), IEC/EN/CSA 62368-1, and IEC/CSA 61010-1 approvals. These are explicitly listed in Table 6 of the datasheet and verified by third-party certificates (e.g., VDE Certificate No. 40011599). The ADuM3473CRSZ marking includes * for VDE 0884-17 compliance.

Can ADuM3473CRSZ drive external MOSFETs directly?

No, ADuM3473CRSZ does not include high-current gate drivers. Its transformer driver output is optimized for driving small-signal transformer primaries (e.g., 1:1 or 1:2 turns ratio) with typical peak currents <500 mA. External power MOSFETs must be driven by a dedicated gate driver stage - the ADuM3473CRSZ provides isolated PWM control signals and bias power, but not direct power switching capability.