FOD2742A

Input Type:	DC
Supplier Device Package:	8-SO Tall
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-25°C ~ 85°C
Vce Saturation (Max):	400mV
Voltage - Forward (Vf) (Typ):	1.2V
Current - Output / Channel:	50mA
Voltage - Output (Max):	70V
Output Type:	Transistor
Series:	--
Rise / Fall Time (Typ):	--
Turn On / Turn Off Time (Typ):	--
Current Transfer Ratio (Max):	200% @ 10mA
Current Transfer Ratio (Min):	100% @ 10mA
Voltage - Isolation:	2500Vrms
Number of Channels:	1
Part Status:	Obsolete
Packaging:	Tube

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Introduction

Optoisolators - Transistor, Photovoltaic Output are becoming increasingly popular due to their unique characteristics and the various application areas they are able to be used in. One such device is the FOD2742A, a 4-channel optoisolator with a single photovoltaic cell and a 2N3904 transistor output. It is normally used in applications such as industrial process control, machine operation control, communication and automotive applications. The following will discuss the application fields and working principles of the FOD2742A.

Application Fields

The FOD2742A is most commonly used in industrial process control systems as it can be used to keep certain processes running smoothly and with minimal possibility for disruption. For example, in a manufacturing facility, the photovoltaic cell of the FOD2742A can be used to detect a particular characteristic of the raw material and send signals to the processing machinery to adjust the process accordingly. Similarly, the FOD2742A can also be used in a machine operation control system to detect the performance of individual machines and trigger the necessary actions. In communication systems, the FOD2742A can be used as an optical receiver, detecting the infra-red signals sent from the transmitter and providing the appropriate electrical signals for further processing. Finally, the FOD2742A can also be used in automotive applications, such as warning systems or monitoring of vehicle parameters.

Working Principles

The FOD2742A is composed of a photovoltaic cell and a 2N3904 transistor output, hence its name - optoisolator, transistor, photovoltaic output. The photovoltaic cell of the FOD2742A is capable of converting the incident light radiation such as infra-red light into electrical current. The intensity of the electrical current is dependent on the intensity of the incident light. The 2N3904 transistor output is used to convert the electrical current generated by the photovoltaic cell into a corresponding voltage level. This voltage level is then used as the output signal of the FOD2742A.In order for the FOD2742A to work properly, the incident light needs to be within the proper wavelength range. This range is usually 400-1100nm for the FOD2742A. The most suitable incident light can be generated from a pulse-modulated infrared LED. Such as the case for many optoisolators, the FOD2742A also comes with an associated response time of no greater than 1mS. This allows the FOD2742A to respond quickly to changes in the incident light signal and provide its user with a fast response rate.

Conclusion

The FOD2742A is a highly versatile optoisolator - transistor, photovoltaic output device that is suitable for a wide array of applications. It is capable of converting incident light into electrical current and then converting this electrical current into a corresponding voltage level, making it ideally suited for industrial process control, machine operation control, communication and automotive applications. Its associated response time of no greater than 1mS and its ability to detect incident light within the proper wavelength range of 400-1100nm adds to the already impressive attributes of the FOD2742A, making it an ideal choice for many different applications.

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