H11A3VM

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Optoisolators, also known as optical couplers or optocouplers, are electronic components that enable electrical isolation of one component from the other. They are widely used in many electronic circuits to maintain galvanic isolation, protect signal integrity, reduce Electromagnetic Interference (EMI) and suppress high voltage transients from occurring in sensitive circuits. The H11A3VM series of optoisolators are Transistor, Photovoltaic Output optoisolators and are widely used for a variety of applications.

The H11A3VM isolators are optically coupled AC/DC input optoisolators consisting of a light-emitting diode optically coupled to a NPN silicon phototransistor output. The optoisolator has high isolation between input and output with ±3000 Vdc withstand voltage, and provides protection against short circuits and static discharge, making them ideal for industrial and automotive applications and provide a secure and reliable mounting. The series provides very good output-to-input noise immunity performance and excellent current transfer ratio over a wide range of temperatures. Their current transfer ratio is a maximum of 10 mA and featuring a wide range of available operating voltages of up to 2.5 VDC.

The H11A3VM optoisolator can be used in a variety of applications where electrostatic discharge protection is needed. The optoisolator helps protect against false triggering caused by high voltage spikes in switch contact bounce and static transients generated by other nearby components or devices. It can also be used as an interfacing and protection device between logic signals, High Voltage AC inputs, DC outputs and motor control signals. The optoisolator can provide signal isolation between two circuits that operate at different voltage levels or have different ground potentials.

The working principle of the H11A3VM optoisolator is based on the transfer of a current signal through the light-emitting diode to the transistor output. The light-emitting diode is connected to the input side of the optoisolator while the transistor output is connected to the output side. When the input signal is applied, the light-emitting diode emits light, which is detected by the phototransistor and it converts the light energy into a current signal at its output. The optoisolator isolates the input current from the output current, and the signal can be transferred across the optoisolator without any direct connection between the two sides.

The optoisolator is usually connected in reverse mode. In this mode, the current flows from the collector to the emitter side of the transistor, allowing the device to detect a greater range of current inputs. The transistor output of the optoisolator provides a level of hysteresis allowing the control of switching action and current flow. This hysteresis prevents false triggering caused by noise and logic level signals, which can interfere with the desired function.

The H11A3VM optoisolator is a reliable and popular choice used for AC/DC signal isolation in many industrial and automotive applications. This optoisolator offers high performance features such as EMC/EMI protection, high isolation, low noise, and excellent signal path performance for a wide range of applications. With its long-term reliability, solid construction, and advanced features, this optoisolator is well suited for today’s demanding applications.

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