Broadband UV Photodiode – SG01S-18
The SG01S-18 is a broadband ultraviolet photodiode built on a silicon carbide (SiC) chip, packaged in a TO-18 hermetically sealed metal housing (one...
Broadband UV Photodiode – SG01S-18
The SG01S-18 is a broadband ultraviolet photodiode built on a silicon carbide (SiC) chip, packaged in a TO-18 hermetically sealed metal housing (one isolated pin, one case pin). It features an active area of 0.06 mm² and offers a spectral sensitivity covering UVA, UVB, and UVC wavelengths (approx. 221 nm to 358 nm) with peak responsivity near ~280 nm. At an irradiation of 10 mW/cm² around the peak wavelength, it delivers a photocurrent of ~960 nA. The device is known for high radiation hardness, low dark current, and stable operation at elevated temperatures.United Spectrum Instruments is the distributor of Sglux GmbH products in India.
Understanding Broadband UV Photodiode - SG01S-18
The SG01S-18 acts as a UV sensor that converts ultraviolet light into an electrical current (photocurrent). Because it’s based on SiC (silicon carbide), it exhibits high resistance to radiation damage, near-zero sensitivity to visible light (“visible-blindness”), and very low dark current (in the femtoampere range). This enables detection of weak UV signals with minimal noise. The small 0.06 mm² active area restricts the amount of photon capture, making it suitable for moderate to high irradiance conditions. Packaged in a robust TO-18 metal can, the sensor is suitable for demanding environmental conditions including higher temperatures and UV dose.
Technical Specifications
| Feature | Specification |
| Typical Responsivity at Peak Wavelength | 0.160 A/W |
| Wavelength of Max. Responsivity | 280 nm |
| Responsivity Range (S = 0.1 × Smax) | 221 … 358 nm |
| Visible Blindness (Smax / S>405 nm) | > 10¹⁰ |
| Active Area | 0.06 mm² |
| Dark Current (1 V reverse bias) | 0.2 fA |
| Capacitance | 15 pF |
| Short Circuit (10 mW/cm² at peak) | 960 nA |
| Temperature Coefficient | < 0.1 %/K |
| Operating Temperature | −55 … +170 °C |
| Storage Temperature | −55 … +170 °C |
| Soldering Temperature (3 s) | 260 °C |
| Maximum Reverse Voltage | 20 V |
Key Features and Advantages
Visible-Blind UV Detection
The SG01S-18 is inherently insensitive to visible light due to its wide bandgap SiC construction. This ensures only UV radiation contributes to its output, eliminating background interference from sunlight or artificial lighting.
High Radiation Hardness
SiC technology provides strong resistance to radiation damage, making the sensor durable even under long-term UV exposure. This feature ensures consistent calibration and minimal degradation in high-irradiance environments.
Ultra-Low Dark Current
With leakage currents as low as 0.2 fA, the photodiode can measure extremely low UV intensities without noise interference. This enhances measurement accuracy for sensitive detection tasks.
Thermal Stability
Operating between −55 °C and +170 °C, the SG01S-18 maintains stability with a temperature coefficient of less than 0.1 %/K. This allows reliable performance in extreme thermal environments.
Fast Response and Low Capacitance
With a capacitance of ~15 pF, the device supports fast signal response, making it ideal for pulsed or rapidly changing UV detection.
Robust Hermetic Packaging
Encased in a TO-18 hermetically sealed metal housing, the SG01S-18 offers strong protection against mechanical stress, moisture, and environmental contaminants, ensuring long-term durability.
Applications Across Industries
UV LED and Lamp Monitoring
The SG01S-18 is widely used in curing, sterilisation, and photochemistry systems to monitor UV irradiance. It ensures stable and consistent light output from UV LEDs and lamps.
Water and Air Disinfection Systems
In UVC disinfection systems, the photodiode validates UV dosage to ensure safety compliance. It also detects lamp aging, drift, and system performance.
Scientific Research and Photobiology
The sensor supports studies in UV photochemistry, material testing, and biological effects of UV exposure. Its low noise and accuracy make it valuable for laboratory instruments.
Environmental Monitoring
When integrated with optical filters, the SG01S-18 can measure solar UV flux and estimate UV index levels for environmental monitoring stations.
Flame Detection and Fire Safety
Flames emit UV radiation in the UVC band. The SG01S-18 is integrated into flame detectors for power plants, industrial burners, and turbines to provide fast, reliable safety alarms.
Semiconductor and Lithography Systems
In semiconductor processing and UV lithography, the sensor provides real-time monitoring of UV intensity, ensuring process consistency and safety.
Wearable UV Dosimetry
Compact UV exposure monitoring devices and badges incorporate the SG01S-18 for precise UV dose measurement, supporting personal and occupational safety.
Why Choose United Spectrum Instruments?
Expert Consultation and Support
United Spectrum provides specialised technical advice, application-specific guidance, and reliable after-sales service. Our team ensures that customers integrate UV photodiodes like the SG01S-18 effectively into their systems for maximum performance.
Reliable Supply and Competitive Pricing
With strong partnerships with global manufacturers, we guarantee genuine products, consistent stock availability, and cost-effective pricing supported by efficient logistics and local inventory management.
Comprehensive End-to-End Solutions
From selection and installation to training and long-term maintenance, United Spectrum delivers seamless support for research, industrial, and academic applications across India.
FAQs
What is the operating spectral range of the SG01S-18?
It covers 221 nm to 358 nm, with peak responsivity near 280 nm.
Can it be used in sunlight or visible light environments?
Yes, it is “visible-blind,” meaning visible light does not affect its readings.
What packaging is used for this photodiode?
It comes in a hermetically sealed TO-18 metal can for durability.
Is external bias required for operation?
It works in photovoltaic mode or with small reverse bias (up to 20 V).
How stable is it at high temperatures?
The SG01S-18 operates stably up to +170 °C with minimal drift.
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FAQs
What is the operating spectral range of the SG01S-18?
It covers 221 nm to 358 nm, with peak responsivity near 280 nm.
Can it be used in sunlight or visible light environments?
Yes, it is “visible-blind,” meaning visible light does not affect its readings.
What packaging is used for this photodiode?
It comes in a hermetically sealed TO-18 metal can for durability.
Is external bias required for operation?
It works in photovoltaic mode or with small reverse bias (up to 20 V).
How stable is it at high temperatures?
The SG01S-18 operates stably up to +170 °C with minimal drift.
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