MOC8101S

Output Type:	Transistor
Supplier Device Package:	6-SMD
Package / Case:	6-SMD, Gull Wing
Mounting Type:	Surface Mount
Operating Temperature:	-55°C ~ 100°C
Vce Saturation (Max):	400mV
Current - DC Forward (If) (Max):	100mA
Voltage - Forward (Vf) (Typ):	1.15V
Current - Output / Channel:	50mA
Voltage - Output (Max):	30V
Series:	--
Input Type:	DC
Rise / Fall Time (Typ):	1µs, 2µs
Turn On / Turn Off Time (Typ):	2µs, 3µs
Current Transfer Ratio (Max):	80% @ 10mA
Current Transfer Ratio (Min):	50% @ 10mA
Voltage - Isolation:	5300Vrms
Number of Channels:	1
Part Status:	Obsolete
Packaging:	Tube

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Introduction

MOC8101S is an optoisolator that features an illuminated photovoltaic output transistor. It is designed to offer an isolation barrier between two circuits while providing a fast, reliable switching action. The device is based on a gallium arsenide infrared emitting diode optically coupled to a silicon NPN phototransistor which offer an isolation voltage of greater than 2500Vrms. The MOC8101S is designed to be suitable for a wide variety of applications from power supply circuits to high speed logic interfacing. The operating temperature spans from -40°C up to +100°C.

Application Field

The MOC8101S can be used in a variety of digital and analog applications. It can be used as an interface between digital logic circuits, replacing a diode/transistor logic (DTL) or transistor-transistor logic (TTL) buffer. It can also be used as an analog input signal isolator to interface a wide range of sensors and other analog signals. It can also be used to isolate power supply portions within a system for safe operation. The optoisolator can also be used for relay driving, motor control, or for other high speed logic interfacing applications.

Working Principle

The MOC8101S optically isolates one circuit from another and provides a fast, reliable switching action. It is made with an LED and an NPN phototransistor output. The LED emits infrared light when it is current-driven, and the phototransistor is activated when the emitted infrared light is detected. When the LED is turned on, the phototransistor is activated and starts to conduct current. The LED can be controlled by a control current that is limited by a built-in resistor. By changing this resistor the control current can be adjusted. When the LED is turned off, the phototransistor is also turned off and no current is flowing. The optoisolator provides an insulation barrier greater than 2500Vrms, which means that the LED is not directly connected to the phototransistor, and there is no electrical connection from the input side to the output side. This means that any generated noise or voltage spikes can not reach the output side and that the signal levels remain isolated, preserving the signals from any potential electrical interferences.

Conclusion

The MOC8101S is a single-channel photovoltaic optoisolator and is designed to offer an isolation barrier between two circuits while providing a reliable, fast switching action. It is suitable for a wide range of applications ranging from analog input signal isolation to power supply circuits to high speed logic interfacing, as well as providing protection against system damages due to EMI or other voltage spikes. By using the built-in limiting resistor, the LED control current can be adjusted according to the application and provide a reliable operation.

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