ISO35TDW

Overview

The ISO35TDW is a digital isolator from the ISO35T series by Texas Instruments, designed for RS-485 communication. It features a single channel with unidirectional polarity and operates at data rates up to 1 Mb/s. The device provides 2500 Vrms isolation via capacitive coupling. It functions within a supply voltage range of 3.15 V to 3.6 V, drawing approximately 8 mA of operating current. Propagation delay is specified at 340 ns. The component supports an extended industrial temperature range from -40°C to +85°C and is housed in a 16-SOIC package.

Feature Summary

• Integrates isolated full-duplex RS-485 transceiver functionality with an integrated transformer driver
• Provides robust signal transmission through capacitive coupling isolation technology
• Supports high node counts for multi-drop network configurations

Applications

• Industrial automation control systems
• Building automation networks
• Process control instrumentation

Procurement Notes

Verify the specific suffix 'DW' corresponds to tube packaging rather than reel or cut tape options when sourcing. Confirm RoHS compliance status and moisture sensitivity level requirements against project specifications. Ensure the selected variant matches the required insulation ratings and working voltage parameters for the target application environment.

Selection Notes

Select this component when an integrated transformer driver is required to simplify RS-485 interface design. The single-channel configuration suits applications needing one isolated bidirectional link. Consider the 16-SOIC footprint for PCB layout constraints. Evaluate the 340 ns propagation delay against system timing requirements to ensure compatibility with the desired baud rate and network topology.

Part Context

This part belongs to the ISO35T family, which distinguishes itself by incorporating an integrated transformer driver for RS-485 transceivers. Unlike standard digital isolators that require external components for bus driving, this series combines isolation and transceiver functions. It shares the SOIC-16 package form factor with other members like the ISO35DWR but offers distinct functional integration for serial communication interfaces.

Replacement Considerations

The ISO35TDWR is a direct pin-compatible alternative differing primarily in packaging format (reel vs. tube). Other ISO35 variants may offer different channel counts or lack the integrated transformer driver.