ISO7420MD

Overview

The ISO7420MD is a low-power, dual-channel digital isolator from Texas Instruments featuring capacitive coupling technology. It operates within a supply voltage range of 3V to 5.5V and supports signaling rates up to 1 Mbps. The device provides 2500Vrms isolation voltage and exhibits a common-mode transient immunity (CMTI) of 25kV/µs. Packaged in an 8-SOIC format, it functions reliably across an extended temperature range of -40°C to +125°C.

Feature Summary

• Capacitive coupling architecture for signal transmission
• Low power consumption with typical current draw of 1.1 mA per channel at 3.3V operation
• High common-mode transient immunity of 25kV/µs

Applications

• General-purpose digital isolation in industrial systems
• Isolation between microcontrollers and peripheral devices
• Signal isolation in measurement and control circuits

Procurement Notes

Verify the specific suffix 'MD' indicates tube packaging rather than tape-and-reel formats like 'MDR'. Confirm the 1 Mbps data rate specification aligns with design requirements, as other variants in the series support higher speeds. Ensure the 8-SOIC package dimensions match the PCB footprint constraints.

Selection Notes

Select this component when low power consumption is critical alongside moderate data rates. The 1 Mbps speed suits applications where high-speed throughput is unnecessary. Verify that the 2500Vrms isolation rating meets safety standards for the target application environment.

Part Context

This part belongs to the ISO7420M family of general-purpose digital isolators. It shares the same core functionality as other variants but differs in packaging and potentially speed ratings. The MD suffix specifically denotes the tube package option available from manufacturers.

Replacement Considerations

ISO7420EDR serves as a parameter-equivalent alternative offering higher data rates.