VO4257D

Current - On State (It (RMS)) (Max):	300mA
Approvals:	BSI, cUR, FIMKO, UR
Supplier Device Package:	6-DIP
Package / Case:	6-DIP (0.300", 7.62mm)
Mounting Type:	Through Hole
Operating Temperature:	-55°C ~ 100°C
Current - DC Forward (If) (Max):	60mA
Voltage - Forward (Vf) (Typ):	1.2V
Turn On Time:	--
Current - Hold (Ih):	--
Series:	--
Current - LED Trigger (Ift) (Max):	1.6mA
Static dV/dt (Min):	5kV/µs
Voltage - Off State:	700V
Voltage - Isolation:	5300Vrms
Number of Channels:	1
Zero Crossing Circuit:	No
Output Type:	Triac
Part Status:	Active
Packaging:	Tube

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Introduction

VO4257D is a optoisolator, a device that communicates electrical signals over an optical barrier. Practically, an optoisolator is used for electrically isolating the input/output from each other while allowing control signals to pass through. This particular optoisolator is a triac and SCR output type, meaning that it can switch up to 6A of AC or DC power supply. The VO4257D is known for its excellent performance, frequency bandwidth and soundproof operation.

Application Field

The VO4257D optoisolator can be used in a variety of applications including industrial automation, medical equipment, industrial communication systems, programmable logic controllers (PLCs), motor drives, and home automation systems. It can be used as an electrical isolation, signal transmission, or a switching circuit, as it is designed to minimize break-down voltage, reduce the amount of interference, and provide better protection against connection errors that can be caused by ground loops or shock hazards. It also provides protection for signal power and control to ensure high reliability.

Working Principle

The VO4257D optoisolator works on the principle of photovoltaic transduction, in which a beam of light is passed across the gap between the input and output of the device. This causes electrons to flow across the gap, causing the output signal to be generated. The gap between the input and output is designed to be minimal and the light beam is well shielded, thereby providing electrical isolation between the two sections of the device. The optoisolator includes an LED emitter, a base, a dielectric insert, a photozener diode, a parasitic capacitance, and a dielectric insert. The LED emitter provides the energy to start the optoisolator’s operations. The photozener diode provides for triggering at a pre-set voltage, and its parasitic capacitance couples the current across the isolation gap. The dielectric insert is used as an insulator between the two layers, and it makes sure that the electrons flow from the input to the output without any interruption. The optoisolator is generally used as a switch in systems that require high-voltage isolation. It can be used to provide high reliability and get digital pulse controls to protect sensitive circuits from voltage spikes and other disturbances. In addition, it is also used in power control, signal switching, and signal protection.

Conclusion

The VO4257D optoisolator is a versatile device with applications in multiple industries. It is designed to provide excellent performance and reliability, and can be used in various systems as an isolator, signal transmission, or a switching circuit. With its minimal break-down voltage, minimal interference, and protective circuit, it can increase the reliability of systems in which it is used.

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