TSSP9x IR Sensor Modules Vishay Semiconductors TSSP9x IR Sensor Modules are compact infrared detector modules designed for presence, proximity, and light curtain applications. The series offers an active low output in response to infrared bursts at 940nm. The frequency of the burst should correspond to the carrier frequency for each device. Additional features include sensitivity at 0.4mW/m2, a supply voltage from 1.8V to 3.6V, and a supply current of 0.37mA. Vishay Semiconductors TSSP9x IR Sensor Modules are available in 38kHz and 56kHz modulation frequencies.