Product category:
Optoelectronic Sensors, Switches and Receivers
News Release from: Optek Technology | Subject: OPB732 Series
Edited by the Electronicstalk Editorial
Team on 24 August 2006
Infra-red switch goes a long way
A long distance infra-red switch has a reflective distance of more than one inch, depending on circuitry.
Providing design engineers with a reflective device capable of operating in dusty environments, TT Electronics Optek Technology has developed a long distance infra-red switch that has a reflective distance of more than one inch, depending on circuitry Designated the OPB732 Series, the reflective switch configuration includes an infra-red LED and phototransistor, and uses an opaque housing to reduce the sensor's ambient light sensitivity
This article was originally published on Electronicstalk on 31 May 2005 at 8.00am (UK)
Related stories
Optically coupled isolators meet military needs
A new series of optically coupled isolators are surface mountable on ceramic or printed circuit board.
NPN phototransistors exhibit fast response times
TT Electronics' Optek Technology has developed a series of NPN silicon phototransistors in 1206 chip packages.
"While an object is in the path of the device, light from the LED will be reflected back to the housing, irradiating the surface of the phototransistor", explained Alan Bennett, Vice President of Sales and Marketing for Optek Technology.
"Both the emitter and sensor are protected by a clear window, which allows the device to operate in dusty environments, such as those in industrial and automotive applications".
The OPB732 reflective switch is also ideal for noncontact reflective object sensing circuits in equipment security, machine safety, assembly line and machine automation, as well as door and end-of-travel sensing applications.
When infra-red light strikes the phototransistor, it becomes forward biased and is considered to be in the "on" state, providing a current proportional to the light striking the phototransistor, Bennett continued.
When the infra-red light from the LED is not reflected to the phototransistor, the device turns "off", minimising the current.
The OPB732 Series light emitting diode features an 850nm wavelength and a power dissipation of 100mW.
Maximum forward current is 50mA and maximum forward voltage is 1.8V (20mA forward current).
Reverse DC voltage is 3V, with reverse current of 100mA (2.0V reverse voltage).
Electrical performance of the output phototransistor is characterised at collector-emitter voltages of 30V, collector DC current of 50mA, and power dissipation of 100mW.
Operating temperature range for the long distance reflective switch is -40 to +85C.
The OPB732 Series assembly is offered with either PC board through-hole pins or 24in, 26AWG wires.
The phototransistor can be configured as a common collector or common emitter device.
Typical pricing for Optek's OPB732 reflective switch is $2.97 each in quantities of 1000.
Lead time, if stock is not available, is from 8 to 10 weeks.
• Optek Technology: contact details and other news
• Email this article to a colleague
• Register for the free Electronicstalk email newsletter
• Electronicstalk Home Page
Search the Pro-Talk network of sites
