ISO1642DWR

Overview

The ISO1642DWR is a four-channel digital isolator from Texas Instruments, featuring two bidirectional I²C channels and two unidirectional CMOS GPIO channels. It operates within a supply voltage range of 2.25 V to 5.5 V and supports data rates up to 50 Mb/s. The device provides an insulation voltage of 6250 Vrms and a common-mode transient immunity of 50 kV/µs. It exhibits a propagation delay of 60 ns and pulse width distortion of 60 ns. Power consumption is specified at 4.3 mA and 8.7 mA for different configurations. The component functions reliably across an operating temperature range of -40°C to +125°C.

Feature Summary

• Supports hot-swappable operation on I²C buses without requiring external pull-up resistors
• Integrates robust electromagnetic compatibility (EMC) performance with high common-mode transient immunity
• Combines bidirectional I²C isolation with additional general-purpose input/output channels

Applications

• Industrial automation systems requiring isolated I²C communication
• Medical equipment needing galvanic isolation for safety compliance
• Inverters and motor drives utilizing hot-swappable bus interfaces

Procurement Notes

Verify the specific ordering suffix to ensure the correct package type and tape-and-reel quantity match your assembly requirements. Confirm that the component meets RoHS standards if required by your manufacturing process. Check humidity sensitivity levels to determine appropriate storage and handling conditions during PCB assembly. Ensure the selected variant aligns with your board space constraints regarding the SOIC-16 footprint.

Selection Notes

Select this component when designing systems that require simultaneous isolation for both I²C data lines and auxiliary control signals. The integrated GPIO channels reduce the need for additional discrete components. Consider the 50 kV/µs CMTI rating for environments with high electrical noise. Verify that the 50 Mb/s data rate satisfies the timing requirements of your specific I²C protocol implementation.

Part Context

This part belongs to the ISO164x family of hot-swappable bidirectional I²C isolators. It is designed to replace traditional transformer or optocoupler-based solutions in modern interface designs. The device simplifies system architecture by combining multiple isolation functions into a single compact package. It is manufactured using Texas Instruments' silicon dioxide (SiO₂) isolation technology.

Replacement Considerations

Direct substitutes include other members of the ISO164x family, such as the ISO1641 or ISO1643, depending on channel configuration needs. Verify pin compatibility and functional equivalence before swapping. Ensure that any replacement maintains the same hot-swap capability and EMC performance characteristics.