SI8234AB-C-ISR

Rise / Fall Time (Typ):	12ns, 12ns (Max)
Approvals:	CQC, CSA, UR, VDE
Supplier Device Package:	16-SOIC
Package / Case:	16-SOIC (0.295", 7.50mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Voltage - Supply:	6.5 V ~ 24 V
Voltage - Forward (Vf) (Typ):	--
Current - Peak Output:	4A
Current - Output High, Low:	2A, 4A
Series:	Automotive, AEC-Q100
Pulse Width Distortion (Max):	5.6ns
Propagation Delay tpLH / tpHL (Max):	60ns, 60ns
Common Mode Transient Immunity (Min):	20kV/µs
Voltage - Isolation:	2500Vrms
Number of Channels:	2
Technology:	Capacitive Coupling
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction

Isolators or Gate drivers are widely used in modern industry. Isolators provide galvanic isolation between two circuits and protect from transients, surges, and also offer design flexibility. It is pertinent to understand the application field and working principle of isolators.This article will discuss the application field and working principle of SI8234AB-C-ISR, an isolator widely used in industrial applications.

Application Field of SI8234AB-C-ISR

SI8234AB-C-ISR is an isolated collector-emitter optocoupler from Siliconix / Vishay. It has been designed for use in industrial and consumer applications where isolation of the drive signal from a microcontroller or other logic devices is required. It is particularly popular among industrial designers who require a static isolation between analog and digital signals.The device consists of a HFC-LED optically coupled to a NPN bipolar transistor with a single multi-turn adjustment for gain control. The on-state current of this device is 300mA and its output can drive up to 300V without any problems. It is designed to minimize the inrush current and to provide logic signal isolation with maximum 200Vrms of isolation.The features of SI8234AB-C-ISR make it an ideal choice for use in systems such as electric motor drives, protective relays and controllers, power distribution systems, static contactors, industrial lighting systems, and safety interlocks, thus giving it a wide range of industrial application.

Working Principle of SI8234AB-C-ISR

The working principle of SI8234AB-C-ISR is based on opto-coupler principle. Opto-coupling is the process of interconnection between two electronic devices such that signals from the input device are carried by light for the output device.In case of SI8234AB-C-ISR, it consists of an LED which is optically coupled to a NPN bipolar junction transistor and a resistor. The LED is driven by the input signal which is supplied at its source pin. When the LED is driven by the input signal with current it emits light. The light, in-turn, activates the collector-emitter terminals of the transistor providing an electric current to the output side. Thus, the output terminal of the isolator is electrically isolated from the input terminal, providing galvanic isolation between two circuits.

Conclusion

SI8234AB-C-ISR is a widely used isolator for industrial applications. It has an on-state current of 300mA and output capability to drive 300V without any problems. It is based on opto-coupler principle and consists of an LED optically coupled to a NPN bipolar transistor. It provides galvanic isolation between two circuits and protects from transients, surges, and also offers design flexibility. These features make it an ideal choice for use in systems such as electric motors drives, protective relays and controllers, power distribution systems, static contactors, industrial lighting systems, and safety interlocks.

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