SI8421AD-D-ISR

Series:	Automotive, AEC-Q100
Packaging:	Tape & Reel (TR)
Part Status:	Active
Technology:	Capacitive Coupling
Type:	General Purpose
Isolated Power:	No
Number of Channels:	2
Inputs - Side 1/Side 2:	1/1
Channel Type:	Unidirectional
Voltage - Isolation:	5000Vrms
Common Mode Transient Immunity (Min):	20kV/µs
Data Rate:	1Mbps
Propagation Delay tpLH / tpHL (Max):	35ns, 35ns
Pulse Width Distortion (Max):	25ns
Rise / Fall Time (Typ):	2ns, 2ns
Voltage - Supply:	2.7 V ~ 5.5 V
Operating Temperature:	-40°C ~ 125°C
Mounting Type:	Surface Mount
Package / Case:	16-SOIC (0.295", 7.50mm Width)
Supplier Device Package:	16-SOIC

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Introduction

Digital isolators are important components used in various electrical and electronic systems to protect both the system circuitry and the personnel interfacing with the system from dangerous high voltages or currents. One such digital isolator is the SI8421AD-D-ISR, which is a two-channel digital isolator designed for industrial applications. The SI8421AD-D-ISR offers isolated inputs, low power consumption, and integrated safety features. In this article, we will discuss the application fields and working principles of the SI8421AD-D-ISR digital isolator.

Application Fields

The SI8421AD-D-ISR digital isolator is well suited to applications involving high-voltage system components or field-installable devices such as drives, controllers, and protection relays. It is also well suited to devices with stringent safety requirements such as medical, aerospace and military applications.The digital isolator\'s low power consumption and wide range of input and output voltages makes it well suited to automotive applications, as well as to AC motor and inverter applications. It is also suitable for industrial distributed control systems, process monitoring and control equipment, and motor speed and position control.

Working Principle

The SI8421AD-D-ISR digital isolator works by providing galvanic isolation between input and output signals. The two channels are electrically isolated from each other to prevent any unwanted interactions between channels.The digital isolator uses an integrated coupler to transmit data across the two channels. The coupler consists of an opto-isolator, a transformer, and an integrated circuit (IC). The transformer is used to step up the voltage while the IC is used to convert the analog input signal to digital data. The opto-isolator is then used to transfer the digital data across the two channels.The SI8421AD-D-ISR digital isolator also has built-in protection features to make sure the device is safe to use in hazardous or high voltage applications. It has reverse polarity protection to prevent incorrect power connections, over-voltage protection to protect against excessive voltages, over-temperature protection to protect against overheating, and dielectric withstand voltage protection to protect against electrostatic discharge.

Conclusion

The SI8421AD-D-ISR digital isolator is a useful and versatile device that can be used in a wide variety of applications. It provides galvanic isolation between signals, low power consumption, wide range of input and output voltages, and integrated safety features. It is well suited to applications involving high-voltage system components, field-installable devices, and devices with stringent safety requirements. Its low power consumption and wide range of input and output voltages also make it a great choice for automotive, AC motor, and inverter applications, as well as for industrial distributed control systems, process monitoring and control equipment, and motor speed and position control.

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