ISO35DWG4

Overview

The ISO35DWG4 is an obsolete isolated transceiver from Texas Instruments, part of the ISOx5 family. It supports RS-485 and RS-422 applications with signaling rates up to 1 Mbps. The device features a 16-SOIC package and operates on a single 3.3V supply. It provides 2500 Vrms isolation via capacitive coupling and offers a common-mode transient immunity of 25 kV/µs. Designed for unidirectional signal transmission, it includes one forward channel and two reverse channels within its architecture.

Feature Summary

• Integrated isolated RS-485 and RS-425 transceiver functionality
• Capacitive coupling technology for galvanic isolation
• Support for high common-mode transient immunity

Applications

• Industrial automation systems
• Factory automation networks
• Data acquisition systems

Procurement Notes

This component is officially marked as obsolete by Texas Instruments and is no longer in active manufacturing. Procurement should focus on verifying the authenticity of remaining stock from authorized distributors or secondary market suppliers. Buyers must confirm the specific revision level and physical condition of available units, as production has ceased and long-term availability cannot be guaranteed by the manufacturer.

Selection Notes

Engineers replacing this obsolete part should evaluate current alternatives within the ISO35 series, such as the ISO35DWR. Selection criteria should prioritize matching the 1 Mbps data rate, 3.3V operating voltage, and SOIC-16 footprint. Verify that substitute components maintain equivalent isolation ratings and support the required RS-485/RS-422 protocol standards for the target application.

Part Context

The ISO35DWG4 belongs to the ISOx5 family of isolated transceivers designed for robust communication in noisy industrial environments. As a G4 suffix variant, it indicates lead-free construction compliant with RoHS standards. This specific model represents an earlier generation of TI's digital isolator technology before the transition to the standard ISO35DW naming convention.

Replacement Considerations

The ISO35DWR is listed as a recommended replacement for the ISO35DWG4. Both devices share similar electrical characteristics and pinouts, facilitating potential drop-in replacements where compatible.