OPB890P55

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Optical sensors are devices used to detect light and convert it into an electrical signal, such as a photointerrupter. The OPB890P55 slot type photointerrupter with transistor output is one such device, designed to detect the presence or absence of an object passing through a slit.

The OPB890P55 is a two-piece package containing an infrared light emitting diode (LED) optically coupled to an NPN silicon phototransistor. The device features a small, rectangular package with a lead at each end designed to optimize mounting. It is designed to connect directly to a printed circuit board. The OPB890P55 is shielded to minimize the effect of ambient light, and has a narrow gap between the optical axes of the LED and phototransistor which helps to minimize the effect of misalignment. It is designed to deliver a high voltage collection current and low voltage dark current, giving better response to short gaps.

The OPB890P55 is typically used as a proximity or interrupt sensing, position sensing, or movement sensing device. In use, an object passes between the LED and phototransistor, which blocks the light. This causes a voltage drop across the terminal of phototransistor, and the output signal is then picked up by an external system. If the light is blocked for a longer period of time, the output signal will remain steady, typically switching between low and high to indicate the presence of an object. In some applications a logic "high" state is required, and so a pullup resistor can be connected to the transistor output for this purpose.

The OPB890P55 is designed to operate over a wide ambient temperature range, from -40 to 85 °C. It has a rating of 4 KV minimum breakdown voltage, 500 μA peak collector current, and an input LED current of 5 mA maximum. The LED output power is 100mW/sr and a wide acceptance angle of up to ±50 Degrees. In addition, the device is designed to work with any voltage between 5 V and 30 V.

The OPB890P55 slot type photointerrupter with transistor output is a useful device for a wide range of applications. It offers a reliable operation over a wide ambient temperature range, high voltage collection and low voltage dark currents. In addition, its narrow gap between LED and phototransistor and its wide acceptance angle makes it suitable for a variety of proximity or interruption sensing and movement sensing applications. The device is also inexpensive and easy to install on printed circuit boards.

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