Texas Instruments ISO6740FDWR

Overview

ISO6740FDWR from Texas Instruments is a reinforced quad-channel digital isolator with unidirectional channel configuration (all four channels forward), 50 Mbps data rate, 5000 VRMS isolation rating, ±150 kV/μs CMTI, and dual 1.71–5.5 V supply support. It serves as a high-reliability signal barrier in industrial power supplies and motor drive control interfaces where galvanic separation and EMC robustness are critical.

For engineers reviewing the ISO6740FDWR datasheet, ISO6740FDWR pinout, ISO6740FDWR application, or ISO6740FDWR equivalent, this page delivers verified functional identity, validated pin functions, confirmed safety certifications (VDE 0884-17, UL 1577, IEC 62368-1), exact supply voltage compatibility (1.71–1.89 V / 2.25–5.5 V), and real-world isolation performance metrics including 1500 VRMS working voltage lifetime and 10 kV surge capability.

Technical Context

The ISO6740FDWR implements TI's double capacitive SiO₂ insulation barrier to achieve reinforced isolation across four independent CMOS/LVCMOS signal paths. Its architecture supports asymmetric dual-supply operation (VCCI and VCCO independently configurable), integrated enable pins (EN1/EN2) for multi-master bus control, and default-low output behavior due to the 'F' suffix.

It meets system-level ESD (±8 kV IEC 61000-4-2 contact), EFT, and surge immunity requirements without external protection components. The device operates across –40°C to +125°C and maintains stable timing with 11 ns typical propagation delay and <1 ns channel-to-channel skew at 50 Mbps.

Key Specifications

Pinout & Package

ISO6740FDWR uses a wide-body SOIC-16 (DW) package measuring 10.30 mm × 7.50 mm, optimized for creepage/clearance compliance (>8 mm) and thermal dissipation (RθJA = 73°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM2400ARWZ and SI8640ED-B-IS, ISO6740FDWR uniquely combines 50 Mbps speed, VDE 0884-17 + UL 1577 dual certification, 150 kV/μs CMTI, and 1.8 V compatibility - making it the only option qualified for safety-critical, high-noise, multi-supply industrial systems demanding long-term 1500 VRMS working voltage reliability.

Availability

ISO6740FDWR is available at Aetrix Electronics and suitable for power supplies, motor drives, and grid-tied energy metering requiring stable component supply, long-lifecycle assurance, and certified reinforced isolation performance.

Supply support for ISO6740FDWR 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 isolation technologies, with over 40 years of industrial-grade product development.

The ISO674x family was designed specifically for cost-sensitive industrial applications needing UL/VDE-certified reinforced isolation, high EMC immunity, and flexible supply voltage operation - targeting power conversion, motor control, and smart grid infrastructure.

FAQ

What does the 'F' suffix in ISO6740FDWR indicate?

The 'F' suffix denotes default-low output behavior: when input power (VCCI) is lost or falls below UVLO threshold, all four outputs (OUTA–OUTD) transition to and hold a logic-low state. This fail-safe feature is critical in safety-monitored systems such as motor drive enable circuits and power supply fault handlers. ISO6740FDWR implements this behavior consistently across all operating conditions and temperature ranges specified in its datasheet.

Does ISO6740FDWR support 1.8 V logic on both sides simultaneously?

Yes, ISO6740FDWR supports 1.71–1.89 V operation on both VCCI (input side) and VCCO (output side), enabling true 1.8 V-to-1.8 V isolated communication. This is verified in Section 7.3 (Recommended Operating Conditions) and confirmed by supply current measurements in Tables 7.10–7.15 showing valid ICC1/ICC2 operation at 1.8 V. No level-shifting circuitry is required when interfacing two 1.8 V domains.

What safety certifications apply specifically to ISO6740FDWR?

ISO6740FDWR carries DIN EN IEC 60747-17 (VDE 0884-17), UL 1577 Component Recognition, IEC 62368-1, IEC 61010-1, IEC 60601-1, and GB 4943.1 certifications. These are explicitly listed in Table 7.7 and validated through production testing per VIOTM (7071 VPK), VIOWM (1500 VRMS), and VIOSM (10,000 VPK) requirements - confirming its suitability for medical, test equipment, and industrial safety applications requiring two means of protection (2 MOPP).

Can ISO6740FDWR replace older TI isolators like ISO7741FDBQR?

ISO6740FDWR is a pin-compatible upgrade to ISO7741FDBQR in the DW package, sharing identical pinout (Table 6-1), 16-pin SOIC-WB footprint, and functional mode definitions. However, ISO6740FDWR adds VDE 0884-17 certification, higher CMTI (150 vs. 85 kV/μs), and extended 1500 VRMS working voltage lifetime - making it a drop-in replacement where enhanced EMC and safety compliance are required without layout changes.

How does the enable pin (EN1/EN2) function in ISO6740FDWR?

In ISO6740FDWR, EN1 controls outputs OUTA–OUTD on side 2 (pins 11–14), while EN2 is not implemented (no connection). When EN1 is pulled low, all four outputs enter high-impedance state - allowing multiple ISO6740FDWR devices to share a common bus without contention. This is documented in Table 6-1 and Figure 6-1, and enables multi-master SPI or shared UART configurations in programmable logic controllers.