ISO7420DR

Overview

The ISO7420DR is a low-power, dual-channel digital isolator manufactured by Texas Instruments. It utilizes capacitive coupling technology to provide electrical isolation between circuits. The device operates with a supply voltage range of 3.3 V to 5 V and supports data rates up to 1 Mbps. Key electrical specifications include an insulation voltage of 2500 Vrms, a propagation delay of 9 ns, and a typical operating supply current of 3.4 mA. It features unidirectional signal transmission across two channels within an 8-pin SOIC package.

Feature Summary

• Provides galvanic isolation using capacitive coupling architecture for robust noise immunity
• Supports bidirectional communication interfaces such as UART, SPI, and I2C
• Operates reliably across an extended industrial temperature range from -40°C to +125°C

Applications

• Isolation between microcontrollers and peripheral devices
• Protection in industrial automation control systems
• Signal isolation in medical equipment interfaces

Procurement Notes

Verify the specific datasheet revision (e.g., Rev F or Rev I) to ensure alignment with design requirements, as parameter tolerances may vary slightly between revisions. Confirm that the SOIC-8 package dimensions match the PCB footprint exactly. Ensure the selected component meets the required insulation voltage ratings for the specific safety standards applicable to the end application.

Selection Notes

Select this component when a low-power solution is required for dual-channel isolation applications. The ISO7420DR is suitable for designs needing moderate data rates up to 1 Mbps. Consider the 8-SOIC package constraints regarding board space. Compare against higher-speed variants if data throughput requirements exceed 1 Mbps, or lower-cost alternatives if power consumption is less critical than unit cost.

Part Context

The ISO7420DR belongs to the ISO742x family of low-power dual-channel digital isolators from Texas Instruments. This series is designed to replace traditional optocouplers in modern electronic designs, offering superior performance in terms of speed, power consumption, and reliability. The family includes various package options and speed grades to accommodate diverse interface requirements.

Replacement Considerations

Direct substitutes within the same family include the ISO7420D and ISO7420FEDR. These parts share similar functional characteristics but may differ in packaging (tube vs. reel) or specific electrical parameters such as propagation delay. Verify compatibility before swapping.