940nm reflective optical sensor offers 0.2 to 5mm detection range

June 08, 2012 // By Julien Happich
Vishay Intertechnology's TCNT2000 reflective optical sensor with transistor output comes in a miniature SMD package measuring just 3.4x2.7x1.5mm, with a detection range from 0.2 to 5mm.

By using Vishay's high-efficiency 940 nm emitter chip, the TCNT2000 provides a typical CTR of 4 %, outperforming competing devices by a factor of 2, according to the manufacturer. With its high CTR, the device provides designers with the option of increasing the detection range, or driving the device at lower drive currents to reduce power consumption without incurring performance losses.

The TCNT2000 features a compact construction with its emitting light source and silicon phototransistor detector arranged in the same plane. The sensor's analog output signal is triggered by detection of reflected infrared light from the objects.

The device offers a built-in daylight blocking filter, which suppresses disturbing ambient light to increase the signal-to-noise ratio, while keeping the maximum spectral sensitivity at the operating wavelength of 940 nm. The TCNT2000 is designed for optical encoding and switching in industrial metering systems, computer disk drives, and consumer devices such as DVD players. In addition, it serves as an accurate position sensor for shaft encoders and is suitable for office equipment such as copy machines, printers, and fax machines. Typical output current under test is 0.8mA. The sensor operates over a temperature range of -40 to +85°C and is lead (Pb)-free reflow solderable according to J-STD-020 profile. The device is RoHS-compliant.

Visit Vishay Intertechnology at www.vishay.com