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A new series of high-performance infrared LEDs ideally suited for proximity sensor applications is now available from ROHM Semiconductor . The SIM-030/031ST and SIM-040/041ST surface-mount IR LEDs feature breakthrough IR wavelength technology providing peak output of 850/870nm, compared to 950nm for comparable devices. The 850/870nm level is much closer to the peak wave sensitivity of phototransistors (sensors), thus achieving higher efficiency proximity sensing and energy savings of up to 66%. In addition, the small package footprint and low-profile further enhance their application in cell phones and other portable devices. The SIM-030/031ST, the smaller of the two devices, has a 2.3mm x 1.95mm footprint and a height of just 0.9mm. With a forward current (IF) of 100mA, the device delivers typical emission strength of 30mW/sr (milliwatts per steradian). The slightly larger SIM-040/041ST (3.1mm x 2.25mm x 1.6mm) provides 40mW/sr, typical emission strength. Field Application Engineer for ROHM Semiconductor, Avi Elmaleh, said, "The combination of ROHM's advanced process technology and packaging has resulted in a superior product for space-constrained proximity sensing. The SIM-030/031ST is the perfect choice for power saving in cell phones, turning off the display when the device is closer to the ear." The ROHM SIM-030/031ST and SIM-040/041ST are the latest additions to the ROHM Optical Sensors Series of emitters, receivers, photointerrupters, tilt sensors, IrDA modules and remote control modules. www.rohm.com
