SI823H5BD-AS3

## Overview

The Skyworks Solutions SI823H5BD-AS3 is a high-speed digital isolator designed to provide galvanic isolation between input and output circuits while supporting high data rate signal transmission. It is primarily intended for industrial, medical, and instrumentation applications where isolation, noise immunity, and safety compliance are critical. This device belongs to the SI823 family and leverages silicon dioxide (SiO₂) isolation technology to achieve robust performance across temperature and voltage ranges.

## Key Features

* Digital isolator with high-speed logic compatibility
* 5 kV RMS isolation rating (1-minute test voltage)
* Data rates up to 25 Mbps per channel
* Dual-channel configuration with independent direction
* Low propagation delay and low skew between channels
* CMOS/TTL compatible logic levels
* Wide operating voltage range for VDD (input side) and VISO (output side)
* UL1577, IEC 60747-5-2 safety certifications
* Surface-mount package for automated assembly

## Electrical Specifications

* Supply Voltage (VDD, input side): 3 V to 5.5 V
* Output Supply Voltage (VISO, output side): 3 V to 5.5 V
* Isolation Voltage: 5 kV RMS (for 1 minute)
* Propagation Delay: typical 16 ns, maximum 24 ns
* Data Rate: up to 25 Mbps per channel
* Differential Input Voltage Tolerance: ±2.5 kV
* Output Logic Levels: VOH ≥ VDD − 0.2 V, VOL ≤ 0.2 V at IO = ±4 mA
* Input Logic Threshold: VIH = 1.5 V min, VIL = 0.8 V max (for 3.3 V VDD)
* Supply Current: 5 mA typical per channel
* Temperature Range: −40°C to +125°C

## Functional Description

* The SI823H5BD-AS3 provides galvanic isolation between input and output circuits using capacitive isolation technology.
* It ensures signal integrity in environments with high common-mode noise or potential voltage transients.
* Each channel can operate independently, allowing bidirectional communication in multi-channel isolation applications.
* Low propagation delay and low channel-to-channel skew make it suitable for synchronous data transmission in high-speed digital systems.
* The device is optimized for low power consumption while maintaining high-speed operation.

## Package and Mechanical

* Package Type: SOIC-16 or Wide Body (surface-mount)
* Pin Pitch: 1.27 mm standard
* Package Dimensions: designed for high-density PCB layouts
* Lead Finish: matte tin, compatible with lead-free soldering
* Moisture Sensitivity Level (MSL): 1, compatible with standard reflow processes
* Marking: lot code and part number for traceability

## Performance Characteristics

* High isolation voltage supports applications requiring reinforced or functional isolation.
* Fast data transmission capability allows reliable operation in high-speed industrial communication protocols.
* Wide temperature operation ensures robust performance in harsh environmental conditions.
* Low input-to-output capacitance reduces signal coupling, enhancing noise immunity.
* The device meets UL1577 and IEC 60747-5-2 standards, ensuring safety compliance in industrial and medical systems.

## Applications

* Isolated RS-232, RS-485, SPI, I²C interfaces
* Industrial automation and control systems
* Isolated gate drive for power electronics
* Medical instrumentation requiring patient isolation
* Data acquisition and instrumentation systems
* Signal isolation in noise-prone environments

The SI823H5BD-AS3 is a high-performance digital isolator optimized for high-speed, low-power, and high-reliability applications. Its combination of isolation, fast propagation, and multi-channel operation makes it suitable for critical systems in industrial, medical, and instrumentation domains.