ISO7240ADWR

Overview

The ISO7240ADWR is a quad-channel digital isolator from Texas Instruments, utilizing capacitive coupling technology for signal transmission. It features four forward channels and zero reverse channels, operating at a data rate of 1 Mbps with a typical propagation delay of 15 ns. The device supports a supply voltage range of 3.15 V to 5.5 V and draws approximately 17 mA of quiescent current per channel. It offers an isolation rating of 4000 Vrms and operates within a temperature range of -40°C to +125°C. Packaged in a 16-pin SOIC (DW) format, it is designed for general-purpose isolation applications requiring robust noise immunity.

Feature Summary

• Provides galvanic isolation between digital circuits using high-reliability capacitive coupling technology.
• Offers unidirectional signal transmission across four independent channels.
• Ensures high common-mode transient immunity to protect sensitive logic interfaces.

Applications

• Industrial communication bus isolation
• Medical equipment signal isolation
• General-purpose digital interface protection

Procurement Notes

Verify the specific suffix 'W' indicates tape-and-reel packaging versus 'DW' tube packaging when sourcing. Confirm RoHS compliance status as required by project specifications. Check for end-of-life notifications or obsolescence notices from Texas Instruments prior to finalizing procurement plans. Ensure compatibility with existing PCB footprints for the 16-SOIC package.

Selection Notes

Select this component for applications requiring moderate data rates up to 1 Mbps with high isolation voltage ratings. Consider the 16-SOIC package dimensions for board space constraints. Evaluate power consumption requirements against the 17 mA per channel specification. Compare against higher-speed variants like the ISO7240CDWR if data throughput needs exceed 1 Mbps.

Part Context

The ISO7240A series belongs to Texas Instruments' portfolio of general-purpose digital isolators. It complements other variants such as the ISO7240C and ISO7240F, which offer different speed and isolation characteristics. This family utilizes silicon dioxide-based capacitive coupling for long-term reliability and low power consumption compared to magnetic or optical alternatives.

Replacement Considerations

Direct functional substitutes include the ISO7240CDWR for higher speed (25 Mbps) or ISO7240ADW for tube packaging. Verify pinout compatibility and electrical parameters before substitution. Consult Texas Instruments documentation for recommended replacement strategies regarding obsolete components.