PS2521L-1-E3-A

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The PS2521L-1-E3-A is an optoisolator of the transistor photovoltaic output type. The device isolates signals between two circuits while blocking high-voltage surge current, stray voltage, and modulation noise between circuits. The optoisolator utilizes an LED and photopransistor, which are optically coupled and electrically isolated through a septum.

The PS2521L-1-E3-A optoisolator offers bipolar output current, allowing the input/output circuit to be configured to drive or switch loads in either direction. Input current consumption is typically 7.8mA at 5V. The optoisolator features fast response times, with typical on-off transition times of less than 10µs with a 0.2µF load. The output transistor is capable of sinking up to 64mA and sourcing up to 26mA.

Applications for this type of optoisolator include medical instrumentation, industrial automation, and process control systems, as well as motor control, electric power systems, and precision sensing devices. The PS2521L-1-E3-A is well suited for use in applications operating from 5V through to 20V.

The working principle of the PS2521L-1-E3-A optoisolator is quite straightforward. In its simplest form, the optoisolator is made up of an LED and phototransistor, which are optically coupled and electrically isolated. When an adequate voltage is applied across the LED, it emits light, and the phototransistor receives this light and generates a current in the collector/emitter circuit. This current is then used to control the operation of the output circuit, providing isolation between the input and output of the device.

The output circuit of the PS2521L-1-E3-A is capable of sinking or sourcing current, depending on the resistance of the load and the input voltage. In the sink mode, the collector current is conducted by the output transistor and is limited by the resistance of the load and the supply voltage. In the source mode, the current is passed from the emitter of the output transistor, and is determined primarily by the collector voltage and the base current.

The PS2521L-1-E3-A optoisolator is a reliable and cost-effective solution for isolating signals between two circuits. Its high-efficiency operation and fast response time make it well suited for use in a variety of applications. Furthermore, its ability to block surge current, stray voltage, and modulation noise provide added protection to sensitive equipment.

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