STHS34PF80 High-Sensitivity Infrared Sensor STMicroelectronics STHS34PF80 High-Sensitivity Infrared Sensor is an uncooled, factory-calibrated IR sensor with an operating wavelength between 5µm and 20µm. The STHS34PF80 sensor has been designed to sense accurately the absolute temperature of objects within its field of view. The information is digitally processed by the ASIC, which can be programmed to monitor motion, presence, or an overtemperature condition.