Texas Instruments ISOW7740FDFMR

Overview

ISOW7740FDFMR from Texas Instruments is a reinforced-isolation quad-channel digital isolator with integrated 5-V-to-5-V DC-DC converter delivering up to 110 mA isolated output current, 100 Mbps data rate, and 24 mV peak-to-peak output ripple - deployed in industrial motor control and factory automation systems requiring compact, emissions-compliant isolation.

For engineers reviewing the ISOW7740FDFMR datasheet, ISOW7740FDFMR pinout, ISOW7740FDFMR application, or ISOW7740FDFMR equivalent, this page delivers verified specifications, SOIC-WB 20-pin terminal mapping, CISPR 32 Class B compliance margin, VSEL-configurable 5 V/3.3 V isolated output, and safety-certified reinforced insulation per DIN VDE V 0884-11 and UL 1577.

Technical Context

The ISOW7740FDFMR integrates four unidirectional forward channels (INA→OUTA, INB→OUTB, INC→OUTC, IND→OUTD) with independent logic supply (VIO: 1.71–5.5 V) and isolated power converter supply (VDD: 3–5.5 V). Its transformer-based DC-DC core operates at 25 MHz to minimize low-frequency noise coupling into signal paths.

Isolation barrier uses double capacitive SiO₂ for signal channels and thin-film polymer for power transformers, achieving 100 kV/µs CMTI and 5000 VRMS reinforced rating. EN/FLT serves dual role as enable input or open-drain fault indicator, while VSEL selects VISOOUT voltage (5 V or 3.3 V) via external connection.

Key Specifications

Pinout & Package

ISOW7740FDFMR is housed in a 20-pin wide-body SOIC (DFM) package measuring 12.83 mm × 7.5 mm, with creepage/clearance >8 mm and reinforced insulation barrier optimized for 5000 VRMS working voltage.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM6400ARWZ and SI88440ED-IS, ISOW7740FDFMR uniquely combines 100 Mbps speed, VSEL-selectable 5 V/3.3 V output, reinforced 5000 VRMS rating, and >5 dB CISPR 32 margin - enabling single-chip isolation + power in safety-critical, space-constrained industrial designs.

Availability

ISOW7740FDFMR is available at Aetrix Electronics and suitable for industrial motor control, smart grid protection relays, and medical patient monitoring equipment requiring stable component supply, long-term lifecycle support, and certified reinforced isolation.

Supply support for ISOW7740FDFMR 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 ICs for industrial, automotive, and medical markets.

The ISOW77xx family was designed to replace discrete isolation + DC-DC solutions in space-constrained, emissions-sensitive applications - integrating signal isolation, low-noise power conversion, and safety certifications into a single SOIC-WB package.

FAQ

What is the maximum load current supported by ISOW7740FDFMR at 5 V VISOOUT?

ISOW7740FDFMR delivers up to 110 mA at 5 V VISOOUT when VSEL is tied to VISOOUT. This is validated under VDD = 5 V ±10%, ambient temperature ≤80°C, and includes 5% output accuracy and 24 mV pk-pk ripple. The device maintains this output while sustaining 100 Mbps data throughput across all four channels.

Does ISOW7740FDFMR support bidirectional data channels?

No, ISOW7740FDFMR is a forward-only quad-channel isolator (4 forward, 0 reverse). Its pinout maps INA→OUTA, INB→OUTB, INC→OUTC, and IND→OUTD. For bidirectional configurations, TI offers ISOW7741FDFMR (3 forward, 1 reverse) and ISOW7742FDFMR (2 forward, 2 reverse), but ISOW7740FDFMR itself has strictly unidirectional signal flow.

How does the EN/FLT pin function in ISOW7740FDFMR?

The EN/FLT pin on ISOW7740FDFMR operates in two mutually exclusive modes: as an active-high enable input (driven high to activate DC-DC) or as an open-drain fault output (active-low alert). It cannot serve both roles simultaneously. When used as FLT, a ≥5 kΩ pull-up resistor to VIO is required; as EN, it accepts standard CMOS logic levels referenced to GND1.

What safety certifications apply specifically to ISOW7740FDFMR?

ISOW7740FDFMR carries reinforced insulation certifications including DIN VDE V 0884-11:2017-01 (VIORM = 1500 VPK), UL 1577 (5000 VRMS, 1 s), IEC 62368-1, IEC 61010-1, IEC 60601-1 (2 MOPP), and GB 4943.1-2011. These are explicitly listed for ISOW774xF devices in TI's official certification documentation.

Can ISOW7740FDFMR operate with independent VIO and VDD supplies?

Yes, ISOW7740FDFMR supports independent VIO (1.71–5.5 V) and VDD (3–5.5 V) supplies. This allows interfacing with mixed-voltage systems - for example, 1.8 V FPGA I/O on the primary side (VIO = 1.8 V) while powering the DC-DC converter from a 5 V rail (VDD = 5 V). GNDIO and GND1 must be shorted on the PCB per datasheet layout guidance.