PS9687L2-A

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PS9687L2-A is an optocoupler in the Logic Output category. It is used to safely pass digital signals across two electrically isolated points. Optocouplers are often used in place of electrical relays or when high voltage needs to be isolated from a low voltage signal. The device has a light-emitting element and phototransistor, which consists of a light-focussing lens and four terminal pins.

The PS9687L2A-A is designed to operate at voltages between 3.7 and 15 volts with a switching threshold that is adjustable between 3.1 and 4.0 volts. The internal circuitry of the optocoupler includes an internally-generated bias voltage, which adjusts the switching threshold of the phototransistor automatically. This device offers very low power consumption and is also noise immune.

Its application fields include controlling actuators such as valves or motors, indicator lamps, and power supplies. It can also be used for monitoring status of switches, as a replacement for general purpose relays in some circuits, and for building up additional logic gates. In all these cases, the device is used to bridge two points in which the high voltage is not allowed, or for preventing interference between two circuits.

When a voltage is applied to the LED, the current flowing through it causes it to emit light. For the phototransistor, the emitted light is focused on a base region, thus activating it. The phototransistor operates much like a regular transistor in terms of voltage and current, but it is optically coupled instead of connected through wire. The photons generated by the LED provide the data transmission path for the device, thus providing the electrical isolation between the input and output circuits.

The PS9687L2-A optoisolator also contains a coupling capacitor which is used to filter out high frequency noise. The capacitor connects from the emitter to the collector of the phototransistor, and it shunts the signal noise and prevents it from propagating further. The device is also protected from reverse polarity and short circuit.

The PS9687L2-A optocoupler is a great choice for controlling and monitoring circuits which require electrical isolation. It features fast speed (20MHz), low power consumption, small package size and wide temperature operating range from -55 to 125 Celsius degrees. The device is compatible with digital integrated circuits making it ideal for applications which require electrical isolation.

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