SI88643BC-IS

Overview

The SI88643BC-IS is a general-purpose digital isolator from Skyworks Solutions, featuring four unidirectional channels with an integrated isolated DC-DC converter. It utilizes capacitive coupling technology to provide electrical isolation rated at 5000 Vrms. The device supports data rates up to 100 Mbps and operates within a supply voltage range of 3 V to 5.5 V. Key timing parameters include a propagation delay of 18 ns and rise/fall times of 2.5 ns. It is housed in a 24-SOIC package and functions reliably across an operating temperature range of -40°C to +125°C.

Feature Summary

• Integrates a high-efficiency isolated DC-DC converter to power the secondary side, eliminating the need for external isolated power supplies.
• Employs silicon dioxide (SiO2) capacitive coupling technology to ensure robust signal transmission across the isolation barrier.
• Provides high common-mode transient immunity (CMTI) to maintain signal integrity in electrically noisy environments.
• Features unidirectional channel configuration with one input channel on the primary side and three output channels on the secondary side.

Applications

• Industrial automation systems requiring galvanic isolation between control logic and power stages.
• Medical equipment needing reliable signal isolation for patient safety and noise reduction.
• Automotive electronics utilizing isolated communication interfaces such as CAN or LIN bus transceivers.
• Power conversion circuits where isolated gate driving signals are necessary for switching devices.

Procurement Notes

Verify the specific suffix 'IS' indicates tube packaging when ordering. Confirm that the 5000 Vrms isolation rating meets your system's safety requirements. Ensure the 24-SOIC footprint matches your PCB layout constraints. Check for AEC-Q100 qualification if automotive reliability standards are mandatory for your application design.

Selection Notes

Select this component when a single-chip solution combining isolation and isolated power generation is required. The 4-channel unidirectional configuration suits applications with asymmetric data flow. Consider the 100 Mbps speed limit against your system's bandwidth needs. Evaluate the thermal performance of the integrated DC-DC converter under maximum load conditions to ensure stable operation.

Part Context

This part belongs to the Si886xx family of digital isolators with integrated DC-DC converters. It is designed to replace traditional transformer-based isolation solutions by offering a smaller form factor and lower power consumption. The series is widely used in industrial and automotive sectors where space efficiency and high reliability are critical design factors.

Replacement Considerations

SI88343ED-AS

FAQ

What is the polarity of the signal channels?

The SI88643BC-IS features unidirectional signal channels, meaning data flows only from the primary side to the secondary side.

Does the device require an external isolated power supply?

No, the SI88643BC-IS includes an integrated isolated DC-DC converter, which generates the necessary power for the secondary side internally.

What is the maximum data rate supported?

The device supports a maximum data rate of 100 Mbps for all four channels.