SI8712BC-B-IS

Series:	Automotive, AEC-Q100
Packaging:	Tube
Part Status:	Active
Technology:	Capacitive Coupling
Type:	General Purpose
Isolated Power:	No
Number of Channels:	1
Inputs - Side 1/Side 2:	1/0
Channel Type:	Unidirectional
Voltage - Isolation:	3750Vrms
Common Mode Transient Immunity (Min):	35kV/µs
Data Rate:	15Mbps
Propagation Delay tpLH / tpHL (Max):	60ns, 60ns
Pulse Width Distortion (Max):	20ns
Rise / Fall Time (Typ):	15ns, 5ns
Voltage - Supply:	3 V ~ 30 V
Operating Temperature:	-40°C ~ 125°C
Mounting Type:	Surface Mount
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	8-SOIC

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SI8712BC-B-IS Digital Isolators Application Field and Working Principle

The SI8712BC-B-IS digital isolator is a component of the Silicon Laboratories Integrated Circuit (IC) family. It is specific for applications needing a showstopper to safeguard both communications and control circuits from the adverse effects of electrical noise, current surges, and electrical transients. This isolator is a bidirectional, power-dissipative device, which allows communication systems to be protected without interruptions to the signal’s integrity. It is mainly used in communication systems found in industrial, automotive, medical, and aerospace electronics applications. The SI8712BC-B-IS Digital Isolator is a non-linear optically coupled AC/DC component designed to significantly reduce EMI and offer signal isolation. It consists of a single source side and a single sink side each with independent power buses and operation. The source side and sink side circuits are linked by a light emitting diode, which is a low power and low voltage LED. On the source side, the LED is triggered by voltage signals sent from the source side through an optocoupler, while on the sink side the LED is driven with a reverse bias.When a valid signal is received at the source side, current is passed through the LED, and if sufficient current is passed through the LED, its brightness is increased and it sends a low voltage signal to the other side. At the sink side, the constant reverse bias applied to the LED provides sufficient current to the diode to generate the necessary transmitted signal. The transmitted signals is then received at the sink side, passing through the optocoupler and is then fed back into the source side, completing the loop. To ensure signal integrity, the source and sink side optocouplers must be matched, as the electrical and optical behavior of the optocouplers must be the same to ensure signal accuracy.The optimal performance of the SI8712BC-B-IS Digital Isolator is based on three factors. The supply voltage method, the line-by-line method, and the optocoupler method. The supply voltage method calculates the necessary power supply voltage for an isolated optoelectronic component, while the optocoupler method is an analog-only solution that calculates the necessary optocoupler transfer ratio at a given ambient light level. The line-by-line method is an analog and digital solution where algorithms are used to calculate the current transmission across a single line.Overall, the working principle of the SI8712BC-B-IS Digital Isolator is to divide electrical circuits which may not be connected and pass signals between them while ensuring signal quality and integrity. The optoelectronic component can manage EMI and transients while enabling reliable communication between two isolated electronic systems. This makes them ideal for use in industrial, medical, automotive, and aerospace electronics systems.

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