Texas Instruments ISO7842FDWW

Overview

ISO7842FDWW from Texas Instruments is a reinforced quad-channel digital isolator with 8000VPK isolation voltage, designed for high-noise industrial and medical systems requiring galvanic separation between input and output domains. It delivers 100Mbps signaling rate, ±100kV/μs CMTI, 11ns typical propagation delay (5V), and operates across –55°C to 125°C with dual 2.25V–5.5V supplies enabling level translation.

For engineers reviewing the ISO7842FDWW datasheet, ISO7842FDWW pinout, ISO7842FDWW application, or ISO7842FDWW equivalent, this page provides verified functional identity, validated SOIC-16 extra-wide-body package mapping, confirmed forward/reverse channel configuration, safety-certified insulation parameters, and real-world EMC performance data per IEC 62368-1 and VDE 0884-17.

Technical Context

The ISO7842FDWW implements silicon-dioxide (SiO₂) capacitive isolation with two forward and two reverse-direction channels, each featuring independent enable pins (EN1/EN2) for high-impedance output control in multi-controller bus applications. Its default output state upon input power loss is low - a key functional distinction from the non-F variant.

It supports asymmetric supply operation (VCCI ≠ VCCO), enabling 2.25V–5.5V level translation across isolated domains while maintaining robust surge immunity (12.8kV), system-level ESD/EFT compliance, and >40-year isolation barrier life under rated stress conditions.

Key Specifications

Pinout & Package

ISO7842FDWW uses the extra-wide body SOIC-16 (DWW) package measuring 10.30mm × 17.25mm with 14.0mm creepage/clearance - optimized for reinforced isolation in high-voltage systems.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM2402BRWZ and SI8642ED-B-IS, ISO7842FDWW uniquely combines 8000VPK reinforced isolation, 100Mbps capability, integrated enable control, and extra-wide-body packaging - making it the only option qualified for IEC 60601-1 patient-connected medical devices and 1500VDC photovoltaic systems requiring certified long-term barrier integrity.

Availability

ISO7842FDWW is available at Aetrix Electronics and suitable for industrial motor control, solar inverter gate driving, medical patient monitoring, and hybrid electric vehicle battery management requiring stable component supply across extended temperature and high-reliability lifecycles.

Supply support for ISO7842FDWW 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 decades of safety-certified product development.

The ISO7842x family was engineered specifically for high-voltage industrial and medical systems demanding reinforced isolation, ultra-high CMTI, and long-term barrier reliability - targeting applications where failure could compromise human safety or system integrity.

FAQ

What is the default output state of ISO7842FDWW during input power loss?

The ISO7842FDWW features a fail-safe default output state of low when VCCI drops below operational threshold - a deliberate design distinction from the ISO7842DWW variant, which defaults high. This behavior is confirmed in the Device Functional Modes section of the datasheet and enables predictable shutdown in motor control and medical safety circuits where active-low fault signaling is required. The ISO7842FDWW maintains this behavior across all four output channels.

Does ISO7842FDWW support independent input and output supply voltages?

Yes, ISO7842FDWW supports fully independent VCCI (input-side) and VCCO (output-side) supplies ranging from 2.25V to 5.5V each, enabling seamless level translation between disparate logic families - for example, interfacing a 3.3V microcontroller to a 5V analog subsystem. This dual-supply architecture is electrically isolated and validated across all recommended operating conditions, including simultaneous 2.5V/5.5V operation with guaranteed timing and drive strength.

What safety certifications apply specifically to ISO7842FDWW?

ISO7842FDWW holds reinforced isolation certifications including 8000VPK per DIN EN IEC 60747-17 (VDE 0884-17), 5.7kVRMS per UL 1577, and system-level approvals to IEC 61010-1, IEC 62368-1, IEC 60601-1, and GB 4943.1. These are explicitly listed in Section 5.7 of the datasheet with certificate numbers (e.g., VDE 40040142, UL E181974), confirming its qualification for use in medical equipment, industrial test gear, and consumer power electronics requiring double insulation.

How does the extra-wide SOIC-16 (DWW) package of ISO7842FDWW improve isolation performance?

The DWW package provides >14.5mm creepage and clearance - significantly exceeding the 8mm minimum of the standard DW variant - to meet stringent reinforced isolation requirements for 8000VPK operation. This geometry directly supports compliance with IEC 62368-1 surge testing (12.8kV) and VDE 0884-17 partial discharge limits, reducing risk of surface tracking in humid or contaminated environments. The ISO7842FDWW's DWW footprint is mechanically distinct and not interchangeable with DW-packaged variants.

Can ISO7842FDWW be used in bidirectional communication protocols like I²C?

No, ISO7842FDWW is not suitable for standard I²C due to its fixed channel directionality: two channels are unidirectional forward (input→output), and two are unidirectional reverse (input←output). While it can isolate SDA/SCL lines separately, it lacks the open-drain topology, slew-rate control, and bidirectional logic required for native I²C bus arbitration. For I²C isolation, TI recommends dedicated devices such as ISO1540 or ISO1541 - not ISO7842FDWW.