Product Description:
YJJ S5981 Silicon PIN Photodiode, 10×10mm, for near-infrared
detection
Features:
S5981 Silicon PIN Photodiode, specially designed for surface mount
(SMD) applications, is primarily used for precise optical scenarios
such as optical axis calibration, position detection, and laser
alignment.
S5981 Photodiode
1. Key Parameters (Ta = 25°C)
Model: S5981
Type: 4-Quadrant Silicon PIN Photodiode
Photo-sensitive Area: 10 × 10 mm (Equal in all quadrants, 5 × 5 mm
per quadrant)
Spectral Response: 320 - 1100 nm (Ultraviolet to Near Infrared)
Hamamatsu Photonics Co., Ltd.
Peak Wavelength: 960 nm
Response Coefficient: 0.72 A/W @ 960 nm
Dark Current: ≤ 4 nA (@ VR = 10V)
Capacitance at Junction: 35 pF (@ VR = 10V, f = 1 MHz)
Cut-off Frequency: 20 MHz
Noise Equivalent Power: 1.9 × 10-¹4 W/Hz¹/²
Package: Ceramic SMD, Thickness 1.26 mm
Operating Temperature: -40°C ~ +85°C
Storage Temperature: -40°C ~ +100°C
Features: 4-Quadrant Division, Large Photo-Sensitive Area,
Ultra-Thin SMD, Lead-Free Reflow Soldering
2. Structure and Pins
4-Quadrant Structure: The illuminated surface is divided into 4
independent quadrants (A/B/C/D), each capable of outputting
photocurrent
Pins: 5 in total (4 signal paths + 1 common terminal), supports SMD
reflow soldering
Advantages: Simultaneous detection of light intensity and light
spot position, no mechanical scanning required
3. Typical Applications
Laser Optical Axis Calibration / Alignment
Positioning and Offset Monitoring for Laser Marking, Welding,
Cutting Equipment
Optical Platform, Telescope, Laser Radar Optical Axis Closed-loop
Correction
Position Sensitive Detection (PSD Alternative)
Center Offset Measurement of Light Spot, Angle Deviation Detection
Robot Vision, Workpiece Alignment, Precise Displacement Sensing
Laser Power / Energy Monitoring
Real-time Detection of 905nm/980nm/1064nm Laser Power
Light Intensity Monitoring for Fiber Optic Communication, Laser
Medical Equipment
Optical Measurement Instruments
Wide-Spectrum Detection for Spectrophotometers, Colorimeters,
Radiometers
Environmental Light Monitoring, Exposure Control for Industrial
Cameras
Automotive / Industrial Automation
Vehicle Laser Radar (LiDAR) Reception, Obstacle Avoidance Sensor
Navigation and Positioning of Automated Guided Vehicles (AGV)
Specifications:
| Spectral range | 320–1100 nm |
| Peak wavelength | 960 nm |
| Response | 0.72 A/W @ 960 nm |
| Dark current | 0.6 nA |
