Series:	PC851X
Part Status:	Discontinued at Digi-Key
Number of Channels:	1
Voltage - Isolation:	5000Vrms
Current Transfer Ratio (Min):	40% @ 5mA
Current Transfer Ratio (Max):	--
Turn On / Turn Off Time (Typ):	--
Rise / Fall Time (Typ):	4µs, 5µs
Input Type:	DC
Output Type:	Transistor
Voltage - Output (Max):	350V
Current - Output / Channel:	50mA
Voltage - Forward (Vf) (Typ):	1.2V
Current - DC Forward (If) (Max):	50mA
Vce Saturation (Max):	300mV
Operating Temperature:	-25°C ~ 100°C

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Introduction

Optoisolators, also known as opto-isolators or optical isolators, are devices used to isolate electrical equipment from their power supply. In particular, the PC851XNNSZ1H is a four output alternating current optoisolator containing a transistor and a photovoltaic cell.

Application Field of PC851XNNSZ1H

The PC851XNNSZ1H optoisolator is commonly used in high-power applications such as power supplies, motor control, and signal processing systems. It is capable of transferring five watts at up to 3A in single-phase or dual-phase alternating current. This makes it ideal for applications that require efficient switching of high power signals or a high degree of isolation between the application’s power supply and control circuitry. This optoisolator can also be used in any application where installing a transformer is impractical or not cost effective.

Working Principle of PC851XNNSZ1H

The PC851XNNSZ1H is an optically coupled transistor optoisolator. It contains a photovoltaic cell that is linked to the base of a transistor via an optically transparent window. When the optically transparent window is exposed to an external light source, the photovoltaic cell produces a current which flows through the base of the transistor. This causes the transistor to switch on, transferring power from the external supply to the application. The isolation between the external source and the application is ensured thanks to the light source used instead of a electrical signal.

Conclusion

The PC851XNNSZ1H optoisolator is a reliable and efficient device suitable for applications which require power transfers of up to five watts. It can efficiently switch high power signals and provide a high degree of isolation between the external source and the application. With its photovoltaic cell and transistor combination, it is a cost effective solution to transformer installation.

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