ADUM3470CRSZ

Overview

The ADUM3470CRSZ is a four-channel digital isolator from Analog Devices, utilizing iCoupler magnetic coupling technology. It integrates a PWM controller and transformer driver to provide up to 2 W of regulated isolated power at 3.3 V to 24 V from a 5.0 V input. The device supports bidirectional data transmission with a maximum data rate of 25 Mb/s per channel. Key electrical parameters include an isolation voltage of 2500 Vrms, a propagation delay of 60 ns, and a common-mode transient immunity exceeding 25 kV/µs. It operates within a supply voltage range of 3 V to 5.5 V and functions across a temperature range of -40°C to +105°C in a 20-lead SSOP package.

Feature Summary

• Integrates PWM controller and transformer driver for isolated DC/DC power generation
• Provides four channels of bidirectional digital signal isolation
• Utilizes iCoupler magnetic coupling technology for high reliability
• Includes built-in protection mechanisms such as soft-start and thermal shutdown

Applications

• Isolated DC/DC converter designs requiring integrated control
• Industrial fieldbus isolation interfaces
• RS-232, RS-422, and RS-485 transceiver isolation
• Gate drive isolation for power switches
• Isolated sensor interface circuits

Procurement Notes

Verify the specific suffix against official Analog Devices documentation to confirm package type and tape-and-reel configuration. Ensure compatibility with system isolation requirements by checking the 2500 Vrms rating. Confirm that the integrated transformer driver meets the target power stage specifications. Validate RoHS compliance status through current manufacturer declarations. Cross-reference part numbers with authorized distributors to avoid counterfeit components.

Selection Notes

Select this component when a design requires both signal isolation and isolated power generation in a single IC. It eliminates the need for separate isolated DC/DC converters in low-power applications up to 2 W. Consider the 25 Mb/s data rate and 60 ns propagation delay for timing-sensitive interfaces. Evaluate the 20-SSOP footprint for PCB layout constraints. Compare against other ADuM347x variants if different channel configurations or unidirectional paths are needed.

Part Context

The ADUM3470CRSZ belongs to the ADuM347x family of four-channel digital isolators. This series shares the core iCoupler technology but varies in channel directionality and internal power management features. Unlike standard isolators, this model includes active circuitry to drive external transformers, enabling compact isolated power solutions. It complements other interface devices like the ADUM3471 for pure signal isolation tasks.

Replacement Considerations

Direct substitutes within the same family include ADUM3471CRSZ for non-power applications. Verify pinout compatibility before swapping. Alternative technologies may require additional discrete components for power isolation.