Excelitas Technologies LHI 968 PIR Sensor, Pyroelectric, Dual Element, Intrusion Detector, TO-5 Metal Housing, 100° FOV

The LHI 968 PIR sensor operates from a 0.3V to 1.5V supply range. This low-voltage operation makes it suitable for battery-powered or low-power embedded systems. Ensure your signal conditioning circuit is designed to accommodate this specific voltage window for optimal performance.

The dual-element configuration uses two pyroelectric sensing elements wired in opposite polarity. This creates a differential output that is sensitive to moving IR sources (like a person) while rejecting common-mode noise and slow environmental temperature drifts, significantly improving detection reliability and reducing false alarms.

The enhanced White Light Immunity prevents the pyroelectric element from saturating under strong ambient light, such as direct sunlight or bright indoor lighting. This ensures the sensor maintains its motion detection sensitivity and stability, making it suitable for installations in areas with variable or high light levels.

Integration typically requires a JFET source follower buffer stage (often integrated within the TO-5 can) and external signal conditioning circuitry, including high-pass filtering, amplification, and window comparison. The sensor's output is a small differential signal that must be processed to generate a digital trigger for motion events.