Texas Instruments ISO6761FDWR

Overview

ISO6761FDWR from Texas Instruments is a six-channel reinforced digital isolator with 50 Mbps data rate, 5000 VRMS isolation rating, ±150 kV/μs CMTI, and dual 1.71–5.5 V supply support. It features default-low output logic (F-suffix), operates from –40°C to 125°C, and is used in motor drive I/O isolation and industrial RS-485/UART signal conditioning.

For engineers reviewing the ISO6761FDWR datasheet, ISO6761FDWR pinout, ISO6761FDWR application, or ISO6761FDWR equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, safety-certified isolation performance, and confirmed alternative options for cost-optimized, high-reliability system-level isolation.

Technical Context

The ISO6761FDWR implements TI's double capacitive SiO₂ insulation barrier across all six channels, enabling reinforced isolation up to 5000 VRMS per UL 1577 and 1500 VRMS working voltage per VDE 0884-17. Its channel directionality is fixed: five forward (IN→OUT) and one reverse (OUT→IN), as defined by pin mapping in Figure 5-2.

It supports independent 1.71–1.89 V and 2.25–5.5 V supplies on each side, enabling level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V domains. The F-suffix denotes default-low output behavior during input loss or power-down, critical for fail-safe gate driver or enable-line isolation.

Key Specifications

Pinout & Package

ISO6761FDWR uses a 16-pin Wide-SOIC (DW) package measuring 10.30 mm × 7.50 mm, optimized for creepage >8 mm and clearance >8 mm per IEC 62368-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISO6761DWR and ADUM6601ARWZ, ISO6761FDWR uniquely combines default-low fail-safe behavior, 50 Mbps speed, 125°C operation, and 5000 VRMS reinforced isolation in a standard SOIC-16 footprint-making it optimal for high-reliability motor control and grid-edge applications where safety integrity and timing precision are non-negotiable.

Availability

ISO6761FDWR is available at Aetrix Electronics and suitable for motor drives, smart electricity meters, and industrial RS-485 networks requiring stable component supply, long-term lifecycle assurance, and certified reinforced isolation.

Supply support for ISO6761FDWR 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 company focused on analog and embedded processing technologies, serving industrial, automotive, and communications markets with high-reliability components.

The ISO676x family was designed for cost-sensitive industrial isolation applications demanding UL/VDE-certified reinforced insulation, robust EMC performance, and multi-supply flexibility-targeting motor control, energy infrastructure, and factory automation systems.

FAQ

What does the 'F' suffix in ISO6761FDWR indicate?

The 'F' suffix in ISO6761FDWR specifies default-low output behavior: all six outputs drive low during power-up, power-down, or input signal loss. This fail-safe state prevents unintended activation of downstream drivers or actuators. Unlike the non-F ISO6761DWR, which defaults high, ISO6761FDWR is selected where safety-critical systems require de-energized states in fault conditions. The 'DWR' denotes tape-and-reel packaging in Wide-SOIC (DW) format.

Does ISO6761FDWR support asymmetric supply voltages?

Yes, ISO6761FDWR supports fully independent supply rails: VCC1 (input side) and VCC2 (output side) can each operate within either 1.71–1.89 V or 2.25–5.5 V ranges. This enables true level translation-for example, interfacing a 1.8 V FPGA I/O bank to a 5 V RS-485 transceiver. The device maintains full 50 Mbps data rate and specified CMTI across all valid combinations, with no requirement for matched rail voltages.

How is the reverse channel implemented in ISO6761FDWR?

In ISO6761FDWR, the reverse channel is physically implemented as INF (Pin 7) → OUTF (Pin 10), with INF accepting an input signal from the output side and OUTF delivering the isolated output to the input side. This differs from bidirectional pins-it is a dedicated unidirectional path opposite to the other five forward channels (INA→OUTA through INE→OUTE). Pin mapping follows Figure 5-2 in the datasheet, and no external configuration is needed to activate this function.

What safety certifications apply specifically to ISO6761FDWR?

ISO6761FDWR carries DIN EN IEC 60747-17 (VDE 0884-17) reinforced insulation certification with VIOWM = 1500 VRMS, UL 1577 recognition (5000 VRMS), IEC 62368-1, IEC 61010-1, IEC 60601-1, and GB 4943.1. These cover industrial, test & measurement, medical (2 MOPP), and information technology equipment. Certification evidence includes VDE certificate number 40040142 and UL file E181974, both referencing the DW-16 package and ISO6761FDWR part number explicitly.

Can ISO6761FDWR replace older TI isolators like ISO7761FDWR?

ISO6761FDWR is a pin-to-pin upgrade to ISO7761FDWR in the same DW-16 package, sharing identical pinout, supply ranges, and default-low behavior. Key improvements include higher CMTI (±150 kV/μs vs. ±100 kV/μs), enhanced surge rating (10 kV vs. 8 kV), and updated VDE 0884-17 certification. No PCB or firmware changes are required for migration, and ISO6761FDWR maintains full backward compatibility while delivering superior noise immunity and safety margin in new designs.