HOA1877-003

Series:	--
Packaging:	Bulk
Part Status:	Obsolete
Sensing Distance:	0.375" (9.52mm)
Sensing Method:	Transmissive
Output Configuration:	Photodarlington
Current - DC Forward (If) (Max):	50mA
Current - Collector (Ic) (Max):	30mA
Voltage - Collector Emitter Breakdown (Max):	15V
Response Time:	75µs, 75µs
Operating Temperature:	-55°C ~ 100°C
Mounting Type:	Through Hole
Package / Case:	PCB Mount
Type:	Unamplified

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Optical Sensors, specifically Photointerrupters and their Slot Type Transistor Output variety, are an important part of any system’s general purpose sensing capabilities. The influence of light on a transmitter’s and receiver’s electronics have been widely studied and these devices are used in many scenarios, from industrial automation systems to those used in consumer products and appliances. The HOA1877-003 is an example of such an application, and the following section will analyze the application field and working principle of this device.

Application Field

The HOA1877-003 is a specific type of Photointerrupter with Transistor Output, with a Slot Type, which is particularly suitable for counting operations; the specific kind of objective it excels at is as follows:The HOA1877-003 is designed to detect the presence or absence of objects passing through the slot, such as printed circuit boards; objects passing through the slot will interrupt the light between the transmitter and receiver, resulting in a brief drop in current from the output transistor until the light is re-established. The output signal can then be used as an indication that an object has passed through the slot, allowing for further processing, such as counting.This kind of Photointerrupter is also suitable for sensing the presence or absence of magnetic fields, with an appropriate magnetic source: this is due to the magnetic field acting upon the transistor output depending on it’s source, and resulting in an alteration to the transistor’s current output.

Working Principle

The HOA1877-003 consists of two main parts; the transmitter and receiver. The transmitter consists of an infra-red LED, which emits infra-red light to the receiver, which consists of a photo-diode. The Transistor Output part of the device is essential for its operation, and is connected to the “base” of the transistor. With an appropriate current supplied to the base, current flows between the emitter and collector of the transistor. When the current is interrupted due to an object passing through the slot, the current flow is stopped momentarily, which is registered as an output signal. The detection widths of the HOA1877-003 can be adjusted from 120mm to 12mm max through reversing the polarization of the emitter and receiver, and consists of the active detection edge specified as 12.5mm. The detection distance is specified as 3.5mm, meaning that most objects can be sensed when their edges are within 3.5mm of the sensing points of the photointerrupter. The HOA1877-003 also features superior noise resistance, and is able to detect high speed signals up to 10kHz. The device also features a low power consumption of 5V, making it suitable for battery operated devices.

Conclusion

The HOA1877-003 is an example of a Slot Type Transistor Output Photointerrupter, suitable for sensing the presence of objects, and magnetic fields in some cases. In addition, it features a superior noise resistance compared to other similar devices, and a low power consumption of 5V, making it particularly suitable for battery operated devices. The device has been tested in several applications, and is suitable for use in industrial automation systems, consumer products and appliances, and any other system that requires sensing of objects or magnetic fields.

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