Pyroelectric infrared sensor PYD 1388

Product overview
The PYD 1388 and PYD 1398 are dual-element pyroelectric detectors housed in a TO-5 metal package with an optical window. Both devices use two sensing elements in an opposed series connection with an integrated FET in a source-follower configuration. The PYD 1398 adds a larger window to reduce white-light sensitivity and a gate resistor to improve low-temperature performance. Two EMI versions are available: standard (one RC filter at drain and source) and enhanced (additional RC-filtering stage for high-EMI environments).

Details
Both models feature opposed-series sensing elements and an integrated source-follower FET. PYD 1388 is the base model in the standard analog range. PYD 1398 provides reduced white-light sensitivity and improved behavior at low temperatures due to its larger window and gate resistor. EMI filtering options allow selection according to electromagnetic environment requirements.

Features

• TO-5 metal housing for EMI shielding
• High-responsivity ceramic pyroelectric elements
• Dual detector with 2 × 1 mm² elements
• 95° / 100° field-of-view (horiz / vert)
• Integrated FET in source-follower configuration
• Integrated EMI filtering stage (one or two stages depending on version)

Applications

• Horizontal-mount sensing applications
• Cost-effective motion detection designs
• Long-distance human motion detection (with lens)
• Energy-saving occupancy sensing
• Intrusion and alarm systems

Technical specifications

• Responsivity: 4.2 kV/W (typical)
• Noise: 20 µVpp (typical) / 50 µVpp (max)
• Operating voltage: 2.0–10 V
• Housing with optical window: TO-5 metal package
• PYD 1388 Field-of-View (horiz/vert): 95° / 87°
• PYD 1398 Field-of-View (horiz/vert): 100° / 100°
• PYD 1388 EMI filtering: 1 stage
• PYD 1398 EMI filtering: 2 stages