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SI8642BB-B-IS1

SI8642BB-B-IS1

Skyworks Solutions Inc.
General Purpose Digital Isolator 2500Vrms 4 Channel 150Mbps 35kV/µs CMTI 16-SOIC (0.154", 3.90mm Width)
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Overview

The SI8642BB-B-IS1 is a high-performance, four-channel digital isolator based on proprietary capacitive coupling technology. It provides 2500Vrms isolation and supports data rates up to 150Mbps, making it suitable for high-speed signal isolation in harsh electrical environments. This configuration features two forward and two reverse channels (2/2) in a compact 16-pin Narrow Body SOIC package.

Why Choose This Part

This isolator offers superior common-mode transient immunity (CMTI) of 35kV/us and low propagation delay of 13ns, ensuring reliable timing in fast-switching systems. It is highly efficient with a low run current of approximately 1.8mA per channel at 2.5V, and it operates across a wide supply range of 2.375V to 5.5V.

Applications

Industrial Fieldbus Isolation
Provides high-speed galvanic isolation for RS-485, CAN, or Profibus networks to prevent ground loops in factory automation.
Isolated SPI/UART Communication
Bridges logic signals between high-voltage power stages and low-voltage controllers in motor drives and solar inverters.
Battery Management Systems (BMS)
Safe monitoring of high-voltage battery stacks by isolating the communication lines between cell balancers and the main MCU.
Isolated ADC/DAC Interfacing
Maintains signal integrity for high-precision data converters by separating noisy digital grounds from sensitive analog domains.

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 (0.154", 3.90mm Width)
Voltage - Supply 2.5V ~ 5.5V
Number of Channels 4
Voltage - Isolation 2500Vrms
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

To evaluate this device, ensure proper PCB layout with clear creepage and clearance zones beneath the 16-NB SOIC package. Decouple VDD1 and VDD2 with 0.1uF and 1uF ceramic capacitors placed as close to the supply pins as possible. For rapid prototyping, seek out the Si86xxISO-KIT evaluation board which demonstrates multi-channel isolation layout best practices.

SI8642BB-B Family

Also available as: SI8642BB-B-IS

Also Consider

ISO7742 TITexas Instruments - Offers a higher CMTI rating of 100kV/us and 5000Vrms isolation for more demanding industrial environments.
ADuM142E Analog Devices - Uses iCoupler transformer technology which may offer different EMI characteristics compared to capacitive solutions.