ISO7420ED

Overview

The ISO7420ED is a low-power, dual-channel digital isolator from Texas Instruments. It provides bidirectional signal isolation with a maximum data rate of 50 Mbps and a common-mode transient immunity (CMTI) of 25 kV/µs. The device operates on supply voltages between 3 V and 5.5 V, drawing a typical current of 3.4 mA. It features propagation delays of up to 11 ns and pulse width distortion of 3 ns. Rated for an insulation voltage of 2500 Vrms, it functions reliably within an operating temperature range of -40°C to +125°C.

Feature Summary

• Capacitive coupling technology enables high-speed digital signal transmission across isolation barriers.
• Dual unidirectional channels provide independent signal isolation for multiple lines.
• Robust common-mode transient immunity ensures reliable operation in noisy environments.

Applications

• Industrial automation systems requiring galvanic isolation
• Medical equipment needing safety-certified signal separation
• Power electronics control circuits

Procurement Notes

Verify the complete part number suffix against official Texas Instruments documentation to ensure correct packaging and temperature grade. Confirm RoHS compliance status and specific package variant requirements before ordering. Cross-reference datasheet revisions to validate parameter consistency. Ensure procurement sources are authorized distributors to guarantee component authenticity and traceability.

Selection Notes

Select this component when dual-channel isolation is required with moderate speed capabilities. The 8-SOIC package offers a compact footprint suitable for space-constrained designs. Consider the 3.3 V to 5.5 V supply range compatibility with standard logic families. Evaluate thermal performance requirements against the specified operating temperature limits.

Part Context

This device belongs to the ISO742x family of low-power digital isolators. It shares architectural similarities with other members like the ISO7421 but differs in channel configuration or output defaults. The series utilizes capacitive isolation technology to replace traditional magnetic couplers in many applications.

Replacement Considerations

The ISO7420FED is listed as a parameter-equivalent substitute by Texas Instruments. Verify pinout compatibility and electrical specifications before substitution.