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Si8631BC-B-IS1R

Si8631BC-B-IS1R

MPN: SI8631BC-B-IS1R
Skyworks Solutions Inc.
General Purpose Digital Isolator 3750Vrms 3 Channel 150Mbps 35kV/µs CMTI 16-SOIC (0.154", 3.90mm Width)
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Overview

The Si8631BC-B-IS1R is a high-performance, triple-channel digital isolator based on proprietary capacitive coupling technology. It provides 3750Vrms isolation and supports data rates up to 150Mbps with high electromagnetic immunity and low power consumption. This device features a unidirectional channel configuration (2 forward, 1 reverse) suitable for isolating serial interfaces like SPI or UART.

Why Choose This Part

The Si8631 offers ultra-low power operation at only 1.5mA per channel at 1Mbps and maintains high CMTI of 35kV/us for robust performance in noisy environments. Its Schmitt trigger inputs and selectable fail-safe modes ensure predictable signal behavior during power-up or signal loss.

Applications

Industrial Fieldbus Isolation
Protects sensitive controllers from high-voltage transients in RS-485, RS-232, and CAN bus industrial networks.
Isolated SPI Communication
The 2/1 channel configuration allows for isolating Clock, Data Out, and Data In signals between a microcontroller and a high-side ADC or sensor.
Battery Management Systems (BMS)
Safe communication across high-voltage battery stacks in electric vehicle and stationary storage applications.
Motor Control Systems
Isolates PWM gate drive signals and feedback loops from high-power inverter stages to prevent ground loops.

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 3
Voltage - Isolation 3750Vrms
Operating Temperature -40degC ~ 125degC
Inputs - Side 1/Side 2 2/1
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

Implementation requires placing 0.1uF bypass capacitors as close as possible to the VDD1 and VDD2 pins. Ensure that the PCB layout maintains the required creepage and clearance distances beneath the SOIC-16 package to meet the 3750Vrms isolation rating. No special software drivers are required as the device operates as a transparent physical layer isolator.