ISO1176TDW

Overview

The ISO1176TDW is a half-duplex, isolated RS-485 and RS-422 transceiver manufactured by Texas Instruments. It features integrated oscillator outputs that provide the primary voltage for an isolation transformer, eliminating the need for external power supplies on the isolated side. The device supports data rates up to 40 Mbps with a common-mode transient immunity of 25 kV/µs. It operates within a supply voltage range of 3.15 V to 5.5 V and functions across temperatures from -40°C to +85°C. Packaged in a 16-pin SOIC (DW) format, it provides 2500 Vrms isolation via capacitive coupling.

Feature Summary

• Integrated oscillator outputs generate primary voltage for the isolation transformer
• Half-duplex operation supporting both RS-485 and RS-422 protocols
• High common-mode transient immunity ensures reliable signal integrity
• Capacitive coupling technology provides galvanic isolation

Applications

• Industrial automation systems requiring isolated communication
• Programmable Logic Controller (PLC) input/output modules
• Process control networks utilizing PROFIBUS or similar standards
• Factory automation equipment needing robust noise immunity

Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging when ordering. Confirm the requirement for integrated transformer driver functionality matches the application design. Ensure the 16-SOIC package dimensions fit the PCB layout constraints. Check for RoHS compliance status if environmental regulations apply to the final assembly.

Selection Notes

Select this component when a single-chip solution for isolated RS-485/RS-422 communication is required without separate isolated power supplies. The integrated transformer driver simplifies bill of materials and reduces board space. Consider the 40 Mbps speed limit and 2500 Vrms isolation rating against system requirements. Evaluate the 16-pin package size relative to available footprint area.

Part Context

The ISO1176 series comprises isolated transceivers designed for harsh industrial environments. The ISO1176TDW specifically integrates the oscillator for the isolation barrier, distinguishing it from variants requiring external isolation power. It belongs to the broader interface IC category, focusing on robust serial communication in noisy settings.

Replacement Considerations

ISO1176DWR serves as a variant within the same family but lacks the integrated transformer driver oscillator. Verify if the application can support external isolation power if substituting with non-T variants. Cross-reference pinouts and electrical specifications carefully before replacing.