Providing medical electronics design engineers with a reflective device capable of an enhanced sensing range in space-constrained applications, TT electronics OPTEK Technology’s OPB733TR reflective object sensor is being deployed in a wide range of medical equipment. The reflective sensor measures just 0.300" x 0.160" with a PC board-mounted profile of just 0.114" and incorporates a lensed IR LED and phototransistor elements to collimate the light beam for enhanced resolution at a detection range from 0.4" (10mm) to 1.0" (25.4mm).

“With the enhanced sensing range and miniature size, the reflective object sensor is being used in tube-in-place and tube proximity hospital infusion pumps; with encoders for volumetric measurement in transfusion pumps; and as carousel/bin sensors for medicine dispensing equipment,” said Roland Chapa, vice president of optoelectronic integrated solutions for OPTEK Technology.

The OPB733TR sensor consists of an IR LED with typical peak emission wavelength of 890nm, mounted alongside a NPN silicon phototransistor, which responds to light reflected by the object being sensed. The phototransistor output on-state collector current is 0.1mA (100μm) at 1/2" [12.7mm] distance from the target and a 20mA forward current and VCE of 5V. Rise and fall time for the phototransistor signal is typically 15μS. The surface mount package is reflow solder compatible to 260°C. The sensors are available in 16mm tape on 7" diameter reels, 500 pieces per reel.

Typical pricing for the OPB733TR reflective object sensor is $1.32 each in quantities of 1k. Lead time, if stock is not available, is from 6 to 8 weeks.

Visit TT electronics OPTEK Technology in booth #1649 at the MD&M West show in Anaheim, CA from February 9-11.

For more information about OPTEK’s OPB733TR reflective object sensor, 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 In Asia, contact T.H. Swee at or call +852-9190-4641.

OPTEK 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. 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.