SI8640BD-ASR

Digital Isolators Overview

The SI8640BD-ASR is a quad-channel digital isolator from the Si864x series, manufactured by Skyworks Solutions. It features unidirectional signal transmission with four forward channels and zero reverse channels. The device operates on a single power supply ranging from 2.5 V to 5.5 V, consuming a typical operating current of 6.1 mA. It provides an insulation voltage of 5000 Vrms using capacitive coupling technology. Key electrical parameters include a data rate of 150 Mb/s, a propagation delay of 8 ns, and a common-mode transient immunity of 35 kV/µs. Pulse width distortion is specified at 0.2 ns, with rise and fall times of 4 ns maximum. The component is qualified under AEC-Q100 standards for automotive applications and functions within a temperature range of -40°C to +125°C.

Digital Isolators Feature Summary

• Provides galvanic isolation via capacitive coupling technology for robust signal integrity.
• Features ultra-low power consumption suitable for energy-efficient system designs.
• Includes high common-mode transient immunity to prevent noise-induced errors.
• Complies with AEC-Q100 qualification standards for automotive reliability.

Digital Isolators Applications

• Automotive electronic control units requiring certified isolation
• Industrial communication interfaces such as CAN and LIN buses
• Power inverter gate drive circuits
• General-purpose isolated digital signal transmission

Digital Isolators Procurement Notes

Verify that the ordering suffix 'ASR' corresponds to the tape and reel packaging format, distinct from tube-packaged variants like 'IS1'. Confirm the specific grade designation 'BD' aligns with the required insulation voltage and performance specifications for the target application. Cross-reference the manufacturer's latest datasheet to ensure compliance with current RoHS directives and material declarations. Validate that the AEC-Q100 qualification status meets the specific automotive reliability requirements of the end product.

Digital Isolators Selection Notes

Select this component when a quad-channel unidirectional isolator with 5000 Vrms insulation is required. Ensure the system supports the 2.5 V to 5.5 V supply range and requires 150 Mb/s data rates. Consider the SOIC-16 package dimensions for PCB layout constraints. Verify that the 8 ns propagation delay and 35 kV/µs CMTI are sufficient for the specific noise environment and timing requirements of the interface circuit.

Digital Isolators Part Context

This part belongs to the Si864x family of low-power digital isolators. It shares architectural similarities with other members like the SI8640BT-AS but differs in packaging and specific qualification grades. The 'BD' prefix typically denotes specific insulation and performance characteristics within the Skyworks portfolio. It serves as a general-purpose solution for replacing optocouplers in modern industrial and automotive systems.

Digital Isolators Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Variants within the same family, such as SI8640BT-AS or SI8640EC-B-IS1, differ in packaging (tube vs. reel) or insulation voltage ratings (3750 Vrms vs. 5000 Vrms). Direct substitution requires verifying pin compatibility and ensuring the alternative meets the specific AEC-Q100 and insulation voltage requirements of the design.