Bullet Sensors & Transducers e-Digest, Vol. 121, Issue 10, October 2010: Product News

    (ISSN 1726-5479)


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



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


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






Charlotte Waters,

Marcom Manager,

TT electronics plc

4222 S. Staples St.,

Corpus Christi, TX, 78411

Tel.: +1-361-985-3166

E-mail: charlotte.waters@ttelectronics-na.com

Optical switch




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