Analog Devices Inc. ADUM140D1BRQZ

Overview

ADUM140D1BRQZ from Analog Devices is a quad-channel digital isolator based on iCoupler® technology, providing 3.0 kV_RMS galvanic isolation for bidirectional signal transmission across high-noise industrial and medical interfaces. It delivers 150 Mbps guaranteed data rate, 13 ns max propagation delay at 5 V, and operates from 1.8 V to 5 V with level translation capability - used in isolated SPI buses, PLC I/O modules, and motor drive gate driver feedback loops.

For engineers reviewing the ADUM140D1BRQZ datasheet, ADUM140D1BRQZ pinout, ADUM140D1BRQZ application, or ADUM140D1BRQZ equivalent, this page provides verified package mapping (16-lead QSOP), fail-safe high/low output configuration, safety certifications (UL, VDE, CSA), and real-world design implications of its 100 kV/µs common-mode transient immunity and AEC-Q100 qualification.

Technical Context

The ADUM140D1BRQZ implements four independent unidirectional CMOS-isolated channels using monolithic air-core transformers, ensuring dc-correct output states without input transitions. Its architecture supports asymmetric supply operation (e.g., 1.8 V side A / 5 V side B) and includes integrated undervoltage lockout (1.6 V threshold) and enable/disable control logic per side.

Unlike optocouplers, it guarantees pulse width distortion <3 ns and channel matching ≤3.0 ns, enabling precise timing in isolated ADC sampling clocks and PWM feedback paths. The device's fail-safe mode defaults outputs to high when input power is absent - confirmed for D1 variant per Ordering Guide and Truth Tables.

Key Specifications

Pinout & Package

ADUM140D1BRQZ is housed in a RoHS-compliant 16-lead QSOP package (RQ-16), with 3.5 mm creepage/clearance and >400 V CTI material group II rating. Pin functions are validated per datasheet Figure 20 (Pin Configurations and Function Descriptions) and Table 11.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-channel digital isolator applications.

Compared with ADUM140D0BRQZ, ADUM140D1BRQZ provides fail-safe high outputs critical for enabling safety interlocks; versus SI8641ED-B-IS, it offers superior CMTI and automotive qualification at the cost of lower isolation voltage - making it optimal for high-noise automotive and industrial control where deterministic fail-safe behavior is prioritized over absolute voltage rating.

Availability

ADUM140D1BRQZ is available at Aetrix Electronics and suitable for industrial PLCs, isolated data acquisition systems, medical diagnostic equipment, and automotive battery management systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADUM140D1BRQZ 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 ADuM140D/ADuM140E family was designed specifically for high-reliability galvanic isolation in noise-immune digital interfaces - targeting applications demanding both safety certification and precise timing, such as motor control, energy metering, and patient-connected medical devices.

FAQ

What is the fail-safe output behavior of ADUM140D1BRQZ?

The ADUM140D1BRQZ defaults all four outputs (OUTA–OUTD) to logic high when VDD1 is unpowered or the DISABLE1 pin is asserted. This behavior is hardwired for the D1 variant and ensures defined states in safety-critical paths like gate driver enables or relay controls - preventing unintended activation during power faults. The ADUM140D1BRQZ datasheet Truth Tables and Ordering Guide confirm this is intrinsic to the D1 suffix.

Does ADUM140D1BRQZ support 1.8 V operation on both sides simultaneously?

Yes, ADUM140D1BRQZ operates with VDD1 and VDD2 independently set from 1.8 V to 5 V. At 1.8 V, it achieves 15 ns max propagation delay and 150 Mbps data rate, enabling direct interfacing with ultra-low-power microcontrollers and sensors without level-shifting circuitry. Electrical Characteristics tables for 1.8 V operation (Table 7) validate timing and drive strength across the full temperature range.

What safety certifications apply to ADUM140D1BRQZ?

ADUM140D1BRQZ carries UL 1577 (3000 V_RMS), IEC/EN/CSA 60950-1, IEC/CSA 60601-1, IEC/CSA 61010-1, CQC GB 4943.1, and DIN EN IEC 60747-17 (VDE 0884-17) certifications. These cover reinforced insulation for industrial, medical, and test equipment applications - with VIORM = 565 V_peak and minimum creepage of 3.5 mm in its QSOP package.

How does ADUM140D1BRQZ compare to optocouplers in terms of timing performance?

ADUM140D1BRQZ delivers 13 ns max propagation delay and <3 ns pulse width distortion at 5 V - outperforming typical optocouplers (50–200 ns delay, >10 ns distortion). Its channel matching of ≤3.0 ns enables synchronous sampling across multiple isolated ADCs, while dc correctness ensures stable outputs without input toggling - a key limitation of LED-based isolation.

Is ADUM140D1BRQZ pin-compatible with earlier ADuM1400-series devices?

No, ADUM140D1BRQZ is not pin-compatible with ADuM1400/ADuM1401/ADuM1402. It belongs to the newer ADuM140D/E generation with enhanced CMTI and updated safety certifications. However, ADUM140E1BRQZ (same package) is explicitly stated as pin-compatible with ADuM1400-series per the datasheet's Backward Compatibility section - ADUM140D1BRQZ is not.