Texas Instruments ISO6740FQDWRQ1

Overview

ISO6740FQDWRQ1 from Texas Instruments is a reinforced quad-channel digital isolator designed for automotive high-voltage subsystems. It delivers 50 Mbps data rate, ±150 kV/μs CMTI, 5000 VRMS isolation rating, and operates across –40°C to 125°C ambient temperature. It serves as a signal-level barrier in battery management systems (BMS) and DC/DC converters to prevent noise coupling between isolated domains.

For engineers reviewing the ISO6740FQDWRQ1 datasheet, ISO6740FQDWRQ1 pinout, ISO6740FQDWRQ1 application, or ISO6740FQDWRQ1 equivalent, key selection criteria include reinforced isolation certification (VDE 0884-17, UL 1577), 1.71–5.5 V dual-supply flexibility, default-low output logic behavior, and SOIC-16 wide-body package compatibility with system-level ESD/EFT/surge immunity requirements.

Technical Context

The ISO6740FQDWRQ1 implements TI's double capacitive SiO₂ insulation barrier across four unidirectional channels, enabling galvanic isolation of CMOS/LVCMOS I/Os without transformers or optocouplers. Its architecture supports independent 1.71–1.89 V or 2.25–5.5 V supplies on input (VCCI/GNDI) and output (VCCO/GNDO) sides, with level translation capability.

Each channel includes dedicated enable inputs (EN1/EN2) that place respective outputs into high-impedance state when asserted low-critical for multi-controller bus arbitration. The device is functionally safety-capable with documented support for ISO 26262 ASIL-B system design, and meets VDA320 isolation requirements for automotive use.

Key Specifications

Pinout & Package

ISO6740FQDWRQ1 uses the DW package: 16-pin SOIC wide-body (10.30 mm × 10.30 mm), with 8 mm minimum creepage and clearance, and reinforced insulation barrier separating input-side (pins 1–8) and output-side (pins 9–16) terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISO6740QDWRQ1, the ISO6740FQDWRQ1 provides mandatory low-default output for fail-safe BMS monitoring, while SI8640ED-B-IS lacks 1.8 V operation and delivers half the CMTI-making it unsuitable for automotive traction systems requiring robustness against 150 kV/μs transients.

Availability

ISO6740FQDWRQ1 is available at Aetrix Electronics and suitable for battery management systems, on-board chargers, and DC/DC converters requiring stable component supply in automotive production programs.

Supply support for ISO6740FQDWRQ1 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and high-reliability automotive ICs, with decades of expertise in isolation technology and functional safety certification.

The ISO674x-Q1 family was engineered specifically for cost-sensitive, high-noise automotive powertrain applications-delivering reinforced isolation, AEC-Q100 Grade 1 operation, and system-level EMC robustness without external protection components.

FAQ

What does the 'F' suffix in ISO6740FQDWRQ1 indicate?

The 'F' suffix denotes the default-low output configuration: when input power or signal is lost, all four output channels of the ISO6740FQDWRQ1 assert logic low. This behavior is critical for fail-safe operation in battery management systems and motor control safety interlocks, ensuring predictable shutdown states without external pull-down resistors.

Does ISO6740FQDWRQ1 support 1.8 V logic interfaces on both sides?

Yes, ISO6740FQDWRQ1 supports 1.71–1.89 V supplies on both input (VCC1/GND1) and output (VCC2/GNDO) sides, enabling direct connection to 1.8 V microcontrollers and peripherals. Level translation is inherent-no external level shifters are needed when interfacing with 3.3 V or 5 V domains on the opposite side.

How is ISO6740FQDWRQ1 certified for automotive safety compliance?

ISO6740FQDWRQ1 is AEC-Q100 Grade 1 qualified (–40°C to 125°C), meets VDA320 isolation requirements, and carries safety certifications including DIN EN IEC 60747-17 (VDE 0884-17), UL 1577, IEC 62368-1, and GB 4943.1. Functional safety documentation is provided to support ISO 26262 ASIL-B system-level development.

What is the purpose of EN1 and EN2 pins on ISO6740FQDWRQ1?

EN1 and EN2 are active-high output enable pins controlling side-1 (OUTA–OUTD) and side-2 (INA–IND) outputs respectively. When pulled low, they place the associated outputs in high-impedance state-enabling shared bus architectures and reducing contention in multi-controller systems. They must be tied high or actively driven for normal operation.

Can ISO6740FQDWRQ1 replace older TI digital isolators like ISO7740?

ISO6740FQDWRQ1 is a pin-to-pin upgrade to ISO7740QDWRQ1 in the DW package, offering enhanced specifications: higher CMTI (±150 kV/μs vs. ±80 kV/μs), improved surge immunity (10 kV vs. 6 kV), and expanded 1.8 V operation. No PCB changes are required, but layout review is recommended to verify creepage/clearance compliance with reinforced isolation requirements.