OPB862T55

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Optical sensors are used widely in a variety of applications, from industrial automation to automotive safety applications. Photointerrupters are specifically designed to detect the presence of an object by detecting disturbances in light. Slot type photointerrupters are further classified by the type of output they provide. The OPB862T55 is a slot type photointerrupter with a transistor output.

The optical structure of a slot type OPB862T55 photointerrupter consists of a gallium arsenide (GaAs) infrared LED (light emitting diode) and a silicon phototransistor. The GaAs infrared LED emits a narrow beam of infrared light which is focused into a thin slot. When an opaque object passes through the slot, it interrupts the beam and the phototransistor detects the absence of light, and creates a corresponding electrical output signal.

The typical output transistor configuration of the OPB862T55 includes an NPN (Negative-Positive-Negative) transistor. A current source resistor connected in series to the LED input provides a constant current to the LED. The transistor provides a logic output signal corresponding to the interruption or presence of light in the slot. The presence of light in the slot causes the output transistor to turn off, providing a logic level low signal at the output. The absence of light in the slot causes the output transistor to turn on, providing a logic level high signal at the output. By changing the value of the current source resistor, the sensitivity of the OPB862T55 can be adjusted.

The OPB862T55 is ideal for applications where it is necessary to detect the presence of an object, such as in industrial automation and automotive safety applications. Its high speed of operation, small die size, low power consumption, and low voltage drop make it an ideal choice for such applications. For applications requiring higher speed, a version of the OPB862T55 with high speed response (OPB862T55H) is also available.

In summary, the OPB862T55 slot type photointerrupter provides a transistor output, making it ideal for detection of the presence of an object. With its small die size, low power consumption, and low voltage drop, the OPB862T55 is an ideal choice for industrial automation and automotive safety applications. A version with high speed response (OPB862T55H) is also available for applications where speed is a critical factor.

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