EL817(S)(B)(TU)

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Number of Channels:	1
Voltage - Isolation:	5000Vrms
Current Transfer Ratio (Min):	130% @ 5mA
Current Transfer Ratio (Max):	260% @ 5mA
Turn On / Turn Off Time (Typ):	--
Rise / Fall Time (Typ):	4µs, 3µs
Input Type:	DC
Output Type:	Transistor
Voltage - Output (Max):	35V
Current - Output / Channel:	50mA
Voltage - Forward (Vf) (Typ):	1.2V
Current - DC Forward (If) (Max):	60mA
Vce Saturation (Max):	200mV
Operating Temperature:	-55°C ~ 110°C
Mounting Type:	Surface Mount
Package / Case:	4-SMD, Gull Wing
Supplier Device Package:	4-SMD

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Optoisolators - Transistor, Photovoltaic Output

An optoisolator is an electrically isolated electrical component consisting of an input, a photonic output, and an internal optical dielectric barrier which prevents current from flowing between the input and the output. Finer manufacturers such as EL817(S)(B)(TU) have developed optoisolators specifically designed to improve the safety and longevity of electrical systems.

Overview

Optoisolators are most commonly used in electrical and electronic circuit designs that require isolation from unexpected power surges, electrostatic discharges, and interference from ambient noise signals. By eliminating any direct electrical connection between the input and output sides of the optoisolator, they are a reliable and safe way to ensure that extremely small voltages or currents can be detected, even if the input side is subject to large differential voltages or currents.

Application Field

EL817(S)(B)(TU) optoisolators are available for a variety of industrial applications, such as elevators, medical equipment, automotive electronics, power supplies, security systems and industrial machinery. They can also be used in audio systems, control devices, electric vehicles and buses, motor controllers, and computerized systems.

Advantages

Optoisolators are a critical tool for reducing the risk of electrical hazards in applications before and after an event. The physical isolation of the input and output provides superior protection by preventing the electrical leakage that would occur if a direct connection was used. The built-in safety margin also makes EL817(S)(B)(TU) an excellent choice for applications where the input may be subject to very large voltage or excessive current.

Working Principle

The heart of the optoisolator is an LED, typically an infrared LED, and a phototransistor. An EL817 (S)(B)(TU) optoisolator is a four terminal device, with one terminal designated the anode and the other the cathode of an LED. The “on” or input side of the optoisolator has the LED side and the output side has the phototransistor side. The LED side only allows a small current to flow, triggering the phototransistor side, which then allows a much larger current to flow. The LED emits a narrow beam of infrared light when a small current flows through it, which is then detected by the output side. When the phototransistor “switches on”, a current flow returns the input back to a low state.

Conclusion

EL817(S)(B)(TU) optoisolators provide superior isolation, safety, and reliability for a variety of industrial applications. The risk of unexpected electrical hazards is dramatically reduced when optoisolators are employed, resulting in greater system longevity and performance. With some of the highest performance optoisolators on the market, EL817(S)(B)(TU) can be trusted to deliver reliable, safe and reliable operation in the most demanding applications.

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