EmbeddedRelated.com
    Parts    SI8642AB-B-IS
Si8642AB-B-IS

Si8642AB-B-IS

MPN: SI8642AB-B-IS
Skyworks Solutions Inc.
General Purpose Digital Isolator 2500Vrms 4 Channel 1Mbps 35kV/µs CMTI 16-SOIC (0.295", 7.50mm Width)
Active5,022 in stock
Datasheet Digi-Key Mouser Compare Prices

Overview

The Si8642AB-B-IS is a quad-channel digital isolator from Skyworks Solutions (formerly Silicon Labs) featuring 2500Vrms isolation and a 2/2 channel configuration. Utilizing CMOS capacitive coupling technology, it provides high electromagnetic immunity and a 35kV/us common-mode transient immunity (CMTI) to protect sensitive low-voltage circuitry from high-voltage noise.

Why Choose This Part

This isolator offers exceptionally low power consumption of approximately 1.8mA per channel at idle and 4.4mA at 1Mbps. Its capacitive isolation technology provides a more reliable and longer-lasting alternative to optocouplers, with significantly tighter propagation delay matching of 35ns.

Applications

Industrial Automation Systems
Used to isolate logic signals between PLC controllers and field-side sensors or actuators to prevent ground loop interference.
Isolated SPI Communication
The 2/2 bidirectional channel mapping allows for isolated MISO, MOSI, SCK, and CS signaling in standard SPI buses.
Motor Control Inverters
Protects MCU PWM outputs from high-voltage switching transients in variable frequency drives (VFDs).
Medical Electronics
Provides necessary safety isolation for patient monitoring equipment and diagnostic instrumentation.

Key Specifications

Type General Purpose
Data Rate 1Mbps
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) 25ns
Propagation Delay tpLH / tpHL (Max) 35ns, 35ns
Common Mode Transient Immunity (Min) 35kV/us

Getting Started

Designers should place 0.1uF and 1uF bypass capacitors as close as possible to the VDD1 and VDD2 pins on the WB SOIC-16 footprint. Ensure the PCB layout maintains the required creepage and clearance distances beneath the package to meet 2500Vrms safety standards.

SI8642AB-B Family

Also available as: SI8642AB-B-IS1