The SPOT-2D is a silicon photodiode designed for precision position sensing and light detection across the UV, visible, and near-infrared spectrum. This bi-cell detector features two separate active areas on a common substrate, each measuring 1.3 mm × 2.5 mm (3.3 mm² per element) with a 0.127 mm gap, enabling nulling, centering, and position measuring applications where spot diameter exceeds cell spacing. Peak sensitivity occurs at 970 nm with responsivity of 0.65 A/W across the 350–1100 nm range.
Technical Specifications
• Sensor Type: Silicon photodiode (bi-cell, two active areas)
• Spectral Response: 350 nm to 1100 nm
• Peak Sensitivity: 970 nm
• Active Area (per element): 1.3 mm × 2.5 mm (3.3 mm²)
• Element Gap: 0.127 mm
• Responsivity: 0.65 A/W
• Dark Current: 50 pA at TA = 23°C
• Capacitance: 3 pF at VR = -10 V
• Rise Time: 22 ns (typical)
• Position Resolution: Better than 0.1 μm
• Uniformity of Response: ±2% (1 mm diameter spot)
• Breakdown Voltage: 30 V
• Recommended Reverse Voltage: -10 V
• Maximum Power Density: 10 mW/cm²
• Angle of Half Sensitivity: 65°
• Package: TO-5 (9.14 mm diameter, 0.11 in height, 8.255 mm length)
• Mounting: Through-hole, 3 pins
– Key Features
• High accuracy and excellent resolution for precision alignment
• Ultra-low dark current for low-noise operation
• Excellent response match between dual cells
• Fast 22 ns rise time enables high-speed measurements
• Exceptional stability over time and temperature
• Superior position resolution below 0.1 μm
– Typical Applications
• Machine tool alignment
• Beam centering and targeting
• Position measurement and surface profiling
• Guidance and control systems
• Spectroscopy and analytical instrumentation
• Laser power monitoring
• Medical diagnostics and imaging
• Industrial process control
– Compatibility & Integration
The SPOT-2D photodiode chip is identical to that used in the FIL-S2DG plastic package variant, providing flexibility in packaging selection for system integration.
