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Si8642BD-B-IS

Si8642BD-B-IS

MPN: SI8642BD-B-IS
Skyworks Solutions Inc.
General Purpose Digital Isolator 5000Vrms 4 Channel 150Mbps 35kV/µs CMTI 16-SOIC (0.295", 7.50mm Width)
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Overview

The Si8642BD-B-IS is a high-performance, four-channel digital isolator from Skyworks Solutions providing up to 5000Vrms isolation. Utilizing proprietary capacitive coupling technology, it supports data rates up to 150Mbps with high immunity to common-mode transients (35kV/us) and a wide supply range of 2.375V to 5.5V. This specific variant features a 2/2 channel configuration (two forward, two reverse) and a fail-safe low output state.

Why Choose This Part

The device offers industry-leading data rates of 150Mbps while maintaining low power consumption of approximately 1.8mA per channel at 0Mbps. Its high CMTI of 35kV/us ensures reliable data integrity in environments with high-speed switching transients, and the wide-body SOIC-16 package provides necessary creepage and clearance for 5000Vrms certification.

Applications

Industrial Automation
High-speed data isolation for PLC communication modules and fieldbus interfaces.
Isolated Power Supplies
Feedback loop isolation in switch-mode power supplies (SMPS) for improved safety and noise immunity.
Battery Management Systems (BMS)
Safe signal transmission between high-voltage battery stacks and low-voltage control units in electric vehicles.
Motor Control Systems
Isolating PWM signals and gate driver control lines from high-power inverter stages.

Key Specifications

Type General Purpose
Data Rate 150Mbps
Technology Capacitive Coupling
Channel Type Unidirectional
Mounting Type Surface Mount
Isolated Power No
Package / Case 16-SOIC (0.295", 7.50mm Width)
Voltage - Supply 2.5V ~ 5.5V
Number of Channels 4
Voltage - Isolation 5000Vrms
Operating Temperature -40degC ~ 125degC
Inputs - Side 1/Side 2 2/2
Rise / Fall Time (Typ) 2.5ns, 2.5ns
Supplier Device Package 16-SOIC
Pulse Width Distortion (Max) 4.5ns
Propagation Delay tpLH / tpHL (Max) 13ns, 13ns
Common Mode Transient Immunity (Min) 35kV/us

Getting Started

Designers should ensure 0.1uF bypass capacitors are placed as close as possible to the VDD1 and VDD2 pins. For evaluation, use a custom breakout for the 1.27mm pitch SOIC-16 package or look for the Si86xxISO-KIT evaluation board to test signal integrity and isolation barriers. Verify that the fail-safe low state matches your system safety requirements for signal loss conditions.

Also Consider

ISO7742 TITexas Instruments - Offers similar 2/2 channel configuration with higher 100kV/us CMTI and 5000Vrms isolation in a different package footprint.
ADuM142E Analog Devices - Uses iCoupler transformer technology as an alternative to capacitive isolation for applications requiring different EMI profiles.
MAX22445 Maxim Integrated - Provides ultra-low power consumption and higher 200Mbps throughput for extremely high-speed isolation needs.