TT Electronics slotted optical switch for noncontact interruptive sensing

Jan. 27, 2011
The OPB200 is a low-profile, optically triggered switch that contains an 890 nm infrared LED and a phototransistor paired in an opaque plastic housing.

The OPB200 is a low-profile, optically triggered switch that contains an 890 nm infrared LED and a phototransistor paired in an opaque plastic housing. Designed with a wider (5.1 mm/0.200 in.) slot, the switch exhibits a forward voltage of 1.7 V (max) @ IF = 20 mA; with a reverse current of 100 μA (max) @ VR = 2 V. It is suited for noncontact interruptive sensing applications in machine and automation design applications.
TT Electronics Optek Technology
Carrollton, TX

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OPB200 optical switch features wider slot (5.1mm/.200") for non-contact sensing...

OPTEK Develops Low-Profile Slotted Optical Switch for Non-contact Interruptive Sensing Applications

Carrollton, TX, September 30, 2010: Providing machine and automation design engineers with a reliable means of non-contact interruptive object sensing, TT electronics OPTEK Technology has developed a low-profile slotted switch designed with a wider slot to accommodate more applications. Designated the OPB200, the optically triggered switch contains an 890nm infrared LED and a phototransistor paired in an opaque plastic housing.

"By adapting the design of this switch to include a wider sensing gap and a lower board-mounted profile, we've expanded the range of applications where engineers can employ non-contact switching," said Roland Chapa, vice president of optoelectronic integrated solutions for OPTEK Technology. "It is ideal for most types of machine automation circuits, especially for assembly line automation and machine safety/security applications."

When no object is present in the slot, the output phototransistor conducts current to maintain the circuit. When an object enters the slot and blocks the beam of infrared light from the LED, the output switches to the OFF state to interrupt the circuit. The device housing is constructed of opaque injection-molded plastic to minimize the sensitivity of the assembly's optical components to ambient visible and near-infrared light, thus enhancing performance.

The OPB200 switch exhibits a forward voltage of 1.7V (max) @IF = 20mA; with a reverse current of 100µA (max) @VR = 2V. Collector-emitter breakdown voltage is 30V (min) @IC = 1mA; with emitter-collector breakdown voltage of 5V (min) @IE = 100µA. Collector dark current is 100nA (max). Collector-emitter saturation voltage is 0.4V (max); and the on-state collector current varies from 1mA (min) to 6mA (max). Operating temperature range is from -40°C to +85°C.

The OPB200 slot measures 0.200"/5.1mm wide, with a depth of 0.320"/8.1mm, and the overall board-mounted profile of the device is 0.400"/10.16mm. Lead length is 0.425" with spacing of 0.400".

Typical pricing for the OPB200 is $0.92 each in quantities of 1,000; lead time, if stock is not available, is from 8 to 10 weeks.

For further information please visit:, or email the TT electronics North America Sales Office at [email protected]. To access the data sheet and other product information for the OPB200 slotted switch, visit:


About OPTEK Technology

OPTEK Technology, a division of TT electronics, is a leading manufacturing and solutions provider for sensing and illumination covering the infrared, visible and ultraviolet spectrum; with standard as well as application specific products for a variety of markets, including, but not limited to office machines, industrial equipment, encoders, automotive electronics, military and high-reliability applications, medical diagnostic equipment and solid-state lighting. Headquartered in Carrollton, TX, the company is ISO/TS16949:2002 and BS EN ISO 9001:2000 certified, as well as ITAR registered.

About TT electronics PLC

TT electronics plc is a focused, global electronics group supplying leading manufacturers in the defense, aerospace, medical, transportation and industrial markets. The Group consists of five divisions: Components, Sensors, Secure Power, Integrated Manufacturing Services and General Industrial each delivering technology, products and services to customers in target markets worldwide. TT electronics plc operates from headquarters based in Weybridge, Surrey, with more than 20 global manufacturing locations and more than 6,000 employees worldwide.

Additional information is available from our corporate website:


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