EL817(S1)(A)(TB)-VG

Output Type:	Transistor
Supplier Device Package:	4-SMD
Package / Case:	4-SMD, Gull Wing
Mounting Type:	Surface Mount
Operating Temperature:	-55°C ~ 110°C
Vce Saturation (Max):	200mV
Current - DC Forward (If) (Max):	60mA
Voltage - Forward (Vf) (Typ):	1.2V
Current - Output / Channel:	50mA
Voltage - Output (Max):	80V
Series:	--
Input Type:	DC
Rise / Fall Time (Typ):	6µs, 8µs
Turn On / Turn Off Time (Typ):	--
Current Transfer Ratio (Max):	160% @ 5mA
Current Transfer Ratio (Min):	80% @ 5mA
Voltage - Isolation:	5000Vrms
Number of Channels:	1
Part Status:	Discontinued at Digi-Key
Packaging:	Tape & Reel (TR)

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Introduction

The EL817(S1)(A)(TB)-VG is an optoisolator manufactured by Excelitas Technologies offer high CMRR, wide operating temperature range, and very low resistance with a single TTL compatible output. It is widely used in different applications and is most typically used as an interface between different circuits with varying voltage levels. The optoisolator works by using a photovoltaic effect to electrically isolate two circuits whilst also allowing information to be transferred across them.

Application Field

The EL817(S1)(A)(TB)-VG is widely used in a number of applications in different industries. In machinery and systems, it is used as an interface between the main control/monitoring circuit and the various other circuits in the system. This allows for the transfer of information such as safety signals and other data. In medical equipment, the optoisolator can be used as a barrier between the main computerized equipment and the patient to ensure the safety of any data being transferred between the two. Additionally, it is used in electronic equipment such as remote audio systems and automotive infotainment systems to interface between the user side and other internal circuits.

Working Principle

The EL817(S1)(A)(TB)-VG consists of an LED/photodiode, a dedicated voltage supply, and a TTL compatible transistors. When electric power is applied to the LED/photodiode, a photovoltaic current is generated which is collected at the output transistor. This transistor is then used to drive a load across the two sides of the optoisolator’s circuit. The photovoltaic current acts as an isolation barrier between the two circuits, allowing them to be connected without any direct electrical contact.

Conclusion

The EL817(S1)(A)(TB)-VG is an optoisolator which is used in many practical applications as an interface between two circuits. It is able to provide electrical isolation between the two circuits, as well as providing reliable data transmission. The optoisolator is able to do this through the photovoltaic current generated by the LED/photodiode when electric power is applied. This current acts as an isolation barrier whilst simultaneously allowing for the transmission of data and other information across the two circuits.

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