Reflective Switch provides safe machine operation.

Press Release Summary:

Series OPB732 non-contact IR switches have reflective distance exceeding 3 in., depending on circuitry and reflective material. Device features opaque housing, which reduces the sensor's ambient light sensitivity, and is available with custom electrical, wire and cabling, and connectors. IR LED has 850 nm wavelength and power dissipation of 100 mW. Offered with PC board through hole pins or 24 in., 26 AWG RoHS wires, switches operate in temperature range of -40 to 85°C.

Original Press Release:

Optek's Long Distance Reflective Switch Provides Safe Operation in Industrial Machine Automation

Non-contact infrared switch extends reflective distance to more than 1 inch...

MUNICH, Germany (November 14, 2006) - Providing design engineers with a long distance sensing device for machine automation safety switches, TT electronics OPTEK Technology has developed a non-contact infrared switch capable of operation in industrial environments. Designated the OPB732 Series, the switch has a reflective distance exceeding three inches, depending on circuitry and reflective material.

According to Alan Bennett, vice president of sales and marketing for OPTEK Technology, the design of the reflective switch makes it ideal for machine automation applications. "The device features an opaque housing which reduces the sensor's ambient light sensitivity, and is available with custom electrical, wire and cabling, and connectors, enabling machine design engineers to adapt it to their specific application," explained Bennett. "In addition, the active optoelectronic components are protected by a clear window to enable the OPB732 Series devices to operate in dusty environments. These features make the switch ideal for applications involving door closures, end-of-travel indicators, short-distance safety curtains, and product positioning systems."

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. When infrared light strikes the phototransistor, it becomes forward biased and is considered to be in the "on" state, providing an IC(ON) current proportional to the light striking the phototransistor. The phototransistor allows the designer to customize the switching threshold, providing an optimized solution for many applications. When the infrared light from the LED is not reflected to the phototransistor, the device turns "off," minimizing the IC(ON) current.

The OPB732 Series infrared 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 (If=20mA). Reverse DC voltage is 3V, with reverse current of 100µA (Vr=2.0V). Electrical performance of the output phototransistor is characterized 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°C to +85°C.

The OPB732 Series assembly is offered with either PC board through hole pins or 24", 26 AWG RoHS 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 1,000. Lead time, if stock is not available, is from 8 to 10 weeks.

For more information about OPTEK's long distance reflective switch, contact TT electronics' OPTEK Technology at 1645 Wallace Dr., Carrollton, TX, 75006; call 972-323-2200, or visit OPTEK on the web at In Europe, contact JP Delaporte at or call +33-1-30-31-5928. In Asia, contact T.H. Swee at or call +852-9190-4641.

OPTEK Technology is a leading manufacturer of standard and application-specific sensors using infrared, visible, magnetic and fiber optic technologies focused on applications in office machines, industrial equipment, encoders, automotive electronics, military and high-reliability applications, and medical diagnostic equipment. Headquartered in Carrollton, TX, the company is ISO/TS16949:2002 and BS EN ISO 9001:2000 certified, as well as ITAR registered. OPTEK Technology was acquired by TT electronics in December 2003.

TT electronics plc is a global electronics company manufacturing a broad range of advanced electronic components, assemblies and sensor modules for the automotive, industrial, telecommunication, computer and aerospace markets.

For more information, contact:
Bob Procsal, Applications Engineer
OPTEK Technology

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