Analog Devices Inc. ADUM5240ARZ

Overview

ADuM5240ARZ from Analog Devices is a dual-channel digital isolator with integrated isoPower® DC-to-DC converter, delivering 5 V/10 mA regulated isolated power and supporting dc to 1 Mbps signal isolation. It features 3 ns max pulse width distortion, 70 ns max propagation delay, and operates across −40°C to +105°C in an 8-lead narrow-body SOIC package for industrial motor control interface and isolated sensor signal conditioning.

For engineers reviewing the ADuM5240ARZ datasheet, ADuM5240ARZ pinout, ADuM5240ARZ application, or ADuM5240ARZ equivalent, this page provides verified timing specs, isolation barrier ratings, truth table behavior under VDD/VISO enable/disable states, and real-world thermal and magnetic immunity constraints - all critical for safety-certified isolated power and data path design.

Technical Context

The ADuM5240ARZ integrates two independent unidirectional logic channels and a chip-scale transformer-based DC-to-DC converter operating at 300 MHz, enabling self-contained isolated power without external magnetics. Its iCoupler® technology uses air-core micro-transformers for both signal and power transfer, eliminating optocoupler latency and LED aging concerns.

It supports dual operational modes: DC-to-DC enabled (VDD = 4.5–5.5 V, VISO = 4.5–5.5 V output) and disabled (VDD = 2.7–4.0 V, VISO supplied externally). Propagation delay skew is limited to 45 ns between units, while channel-to-channel matching is ≤3 ns for codirectional signals - essential for synchronous sampling and gate drive timing integrity.

Key Specifications

Pinout & Package

ADuM5240ARZ uses a narrow-body 8-lead SOIC package (SOIC_N), with creepage/clearance ≥4 mm and internal insulation rated for 560 V peak working voltage per DIN EN IEC 60747-17 (VDE 0884-17).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel isolated power and signal applications.

Compared with Si8640ED-B-IS and ISO7721DWR, ADuM5240ARZ uniquely combines signal isolation with regulated 5 V/10 mA power in one SOIC-8 package - eliminating external DC/DC components and reducing bill-of-materials cost and board space in low-power isolated subsystems.

Availability

ADuM5240ARZ is available at Aetrix Electronics and suitable for industrial motor control interface, isolated sensor signal conditioning, programmable logic controller (PLC) digital I/O modules, and medical equipment isolated power and data path applications requiring stable component supply and long-term lifecycle support.

Supply support for ADuM5240ARZ 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 ADuM5240ARZ belongs to the iCoupler® isoPower® family, designed specifically to integrate isolated power and signal transfer into compact, safety-certified packages for space- and reliability-constrained isolated subsystems.

FAQ

What is the maximum continuous working voltage supported by ADuM5240ARZ?

The ADuM5240ARZ supports a maximum continuous working voltage of 425 V peak for 50-year lifetime under bipolar AC waveform conditions, and 560 V peak for reinforced insulation per DIN EN IEC 60747-17 (VDE 0884-17). These values are validated through partial discharge testing at 1050 V peak and thermal derating analysis up to 150°C case temperature - ensuring long-term reliability in mains-connected industrial equipment.

Can ADuM5240ARZ operate with external VISO supply instead of internal DC-to-DC?

Yes, ADuM5240ARZ can operate with external VISO supply. When VDD is reduced to 2.7–4.0 V, the internal DC-to-DC converter disables automatically, and VISO becomes an input pin accepting 2.7–5.5 V from an external isolated source. In this mode, signal isolation remains fully functional, and VOA/VOB outputs behave identically per the truth table - enabling hybrid power architectures where higher efficiency or different output voltages are needed.

What is the propagation delay skew between ADuM5240ARZ units?

The propagation delay skew for ADuM5240ARZ is specified as 45 ns maximum - defined as the worst-case difference in tPHL/tPLH between two separately manufactured units under identical operating conditions (temperature, supply, load). This parameter ensures predictable timing margins in multi-unit systems such as parallel motor phase controllers or redundant safety circuits where inter-unit synchronization matters.

Does ADuM5240ARZ require external bypass capacitors?

Yes, ADuM5240ARZ requires low-inductance ceramic bypass capacitors on both VDD and VISO pins. The datasheet specifies ≤20 mm total lead length between capacitor terminals and supply pins, with recommended values of 100 nF near each supply pin. These capacitors suppress 300 MHz oscillator noise and 1 ns data-refresh transients - failure to implement proper bypassing results in increased output voltage ripple (>250 mV p-p) and potential logic errors in high-noise environments.

How does ADuM5240ARZ ensure DC correctness during signal inactivity?

ADuM5240ARZ ensures DC correctness via periodic refresh pulses sent across the transformer every ~1 µs when no input transitions occur. These pulses maintain the correct output logic state even during static input conditions - preventing output drift or latch-up. If refresh pulses cease for >5 µs (indicating primary-side power loss), the watchdog timer forces VOA/VOB to a default low state, providing fail-safe behavior critical in safety-critical motor control and medical applications.