The SG01S-18S photodiode converts ultraviolet light into measurable photocurrent with exceptional precision. Using SiC as the base material, it is naturally insensitive to visible light, ensuring a clean UV-only response. Its small active area allows for controlled sensitivity under moderate to strong irradiance, while its ultra-low dark current ensures high signal-to-noise performance even in low-light UV environments. Compared to the standard SG01S-18, the short-cap “S” version provides a more compact profile, making it easier to integrate into systems with limited vertical clearance. Its hermetically sealed TO-18 package ensures stability under mechanical, thermal, and environmental stress.

Visible-Blind UV Sensitivity

The SG01S-18S is specifically sensitive to ultraviolet radiation, with no response to visible or infrared light. This ensures accurate UV detection even in ambient light environments, preventing false readings.

Compact Short-Cap Design

The short-cap (~3.7 mm) TO-18 housing reduces vertical height, making it ideal for portable instruments, flush-mounted sensors, and compact modules where space is limited.

Broadband UV Response

Covering 221 nm to 358 nm, it spans UVA, UVB, and UVC detection, suitable for general-purpose UV monitoring across multiple industries.

Ultra-Low Dark Current

Leakage current is in the femtoampere range (~0.2 fA), enabling high-sensitivity detection of weak UV sources without electronic noise interference.

Thermal and Radiation Stability

Engineered for harsh environments, the SG01S-18S operates reliably from −55 °C to +170 °C with less than 0.1 %/K temperature coefficient, and maintains responsivity under high UV doses.

Fast Response Time

With low capacitance (~15 pF), the sensor responds quickly, making it suitable for pulsed UV detection, high-speed monitoring, and real-time feedback loops.

Durable Hermetic Packaging

The TO-18 sealed metal can provides protection against humidity, contamination, and mechanical stress, ensuring long-term durability in industrial and outdoor use.

Compact UV Measurement Devices

The short-cap design makes SG01S-18S ideal for handheld testers, portable UV monitors, and small-form-factor devices used in fieldwork and research.

UV Curing and Industrial Systems

In curing processes involving inks, adhesives, or coatings, the photodiode ensures consistent irradiance monitoring, enabling quality control in compact equipment.

Disinfection and Sterilisation Systems

Used in UVC air, water, and surface disinfection systems, it validates dosage, detects lamp ageing, and helps maintain compliance with safety standards.

Scientific Research and Laboratory Instruments

In photobiology, material science, and spectroscopy, SG01S-18S provides stable UV detection in experimental setups with limited space.

Environmental Monitoring

Integrated into environmental sensors, the diode measures solar UV flux. Combined with optical filters, it supports compact UV index monitoring stations.

Flame Detection and Safety Systems

It can detect UVC emissions from flames in turbines, burners, or industrial safety monitoring, where compact packaging enables easier integration.

Semiconductor and Lithography Applications

UV lithography and exposure systems rely on stable UV monitoring, and the SG01S-18S allows in-situ intensity feedback in space-restricted enclosures.

Wearable UV Dosimetry

Its small active area and compact housing make it suitable for wearable badges and personal UV monitoring devices.

Expert Consultation and Support

United Spectrum provides application-specific guidance, technical consultation, and after-sales service, ensuring customers integrate SG01S-18S seamlessly into their systems.

Reliable Supply and Authentic Products

We maintain strong partnerships with global manufacturers, guaranteeing genuine devices, local stock availability, and competitive pricing backed by efficient logistics.

Complete End-to-End Solutions

From selection and calibration to training and long-term maintenance, we deliver comprehensive support to research organisations, industries, and academic institutions across India.

United Spectrum is your trusted partner for compact and reliable UV sensing solutions.