ISO35MDWR

Overview

The ISO35MDWR is a fully integrated, isolated RS-485 and RS-422 transceiver manufactured by Texas Instruments. It combines the ISO35 digital isolator with an RS-485/RS-422 transceiver in a single SOIC-16 package. The device supports data rates up to 1 Mbps with a propagation delay of 340 ns. It features a 2500 Vrms isolation voltage and a common-mode transient immunity (CMTI) of 25 kV/µs. Operating on a 3.15 V to 3.6 V supply, it draws 8 mA of quiescent current. The component operates within a temperature range of -55°C to +125°C.

Feature Summary

• Integrates capacitive coupling digital isolation with RS-485/RS-422 transceiver functionality
• Provides high common-mode transient immunity for noisy industrial environments
• Supports full-duplex and half-duplex communication modes
• Operates over an extended industrial temperature range

Applications

• Industrial automation systems requiring galvanic isolation
• Building automation and control networks
• Process control instrumentation interfaces
• Energy metering applications

Procurement Notes

Verify the specific suffix 'M' indicates the extended temperature range (-55°C to +125°C) compared to standard variants. Confirm the 'W' suffix corresponds to the SOIC-16 tape and reel packaging format. Ensure compatibility with system voltage levels and signal integrity requirements before finalizing procurement specifications.

Selection Notes

Select this component when both signal isolation and transceiver functionality are required in a compact form factor. The wide operating temperature range makes it suitable for harsh industrial environments. Consider the 1 Mbps data rate limit and 2500 Vrms isolation barrier when designing safety-critical circuits.

Part Context

This part belongs to the ISO35 family of isolated transceivers from Texas Instruments. It differs from non-isolated RS-485 transceivers by providing built-in galvanic isolation. It complements other devices in the ISO series, such as the ISO35DWR, which may offer different temperature ratings or packaging options.

Replacement Considerations

Public confirmed substitute part numbers: ISO35MDW.