340nm uv led DOWA TO39 310nm 325nm
Product Details Description
The xFxVL-1H331 is a DOWA UV LED diode series developed for engineering applications that require ultraviolet emission in a TO39 package. The series includes 310nm, 325nm, and 340nm wavelength options, allowing equipment designers to choose the proper UV band for optical testing, sensing, analysis, and instrument development.
The 340nm uv led version is suitable for projects that require a compact UVA / near-UV light source with a narrow beam. It provides 1.0mW radiant flux at 340nm, 4V forward voltage, 40mA current, and a 6° view angle. This combination makes it useful for systems that need controlled UV output rather than broad-area illumination.
The TO39 hemispherical can package gives the product a durable metal-can structure and a φ9mm diameter. The hemi lens helps shape UV emission for focused delivery into optical paths, sample areas, detector zones, or compact test chambers. For instrument engineers, this 340nm uv led can simplify mechanical alignment when compared with loose chip-level emitters.
This product can be applied in spectroscopy equipment, fluorescence excitation tools, chemical analysis devices, biological analysis systems, optical sensing modules, material response testing, and customized UV inspection instruments. It may also be considered for low-power UV curing tests when the target material responds to the 340nm wavelength and the required UV dose is verified by the final system.
The 310nm version provides 0.8mW radiant flux at 5V, the 325nm version provides 0.9mW at 4.5V, and the 340nm uv led version provides 1.0mW at 4V. All three wavelength options operate at 40mA. This makes the xFxVL-1H331 series useful for engineers comparing different UV wavelengths under similar package and current conditions.
Final performance depends on the complete optical and electrical design. Important factors include driver current accuracy, thermal path, lens alignment, working distance, target material, detector sensitivity, shielding, and system calibration. For stable operation, the 340nm uv led should be used with a proper current-controlled driver and suitable handling procedures.
This product should not be positioned as a general black light strip, high-power curing lamp, or disinfection light source. It is better described as a DOWA TO39 UV LED component for optical, analytical, and sensing applications. Clear positioning helps the page match B2B buyers who search for exact wavelength, package, radiant flux, and view angle.
Safety is important when testing or integrating this 340nm uv led. Do not look directly at the working diode, and do not expose skin or eyes to UV radiation. Use protective eyewear, shielding, warning labels, and controlled test procedures during engineering evaluation and equipment assembly.
Specifications
Brand: DOWA
Model NO.: xFxVL-1H331
Wavelength: 310nm / 325nm / 340nm
TO Type: TO39
Radiant Flux: 0.8mW at 310nm / 0.9mW at 325nm / 1.0mW at 340nm
Voltage: 5V at 310nm / 4.5V at 325nm / 4V at 340nm
Current: 40mA
View Angle: 6°
Lens Type: Hemi
TO Diameter: φ9mm
FAQ
What is this 340nm uv led used for?
This 340nm uv led is used as a compact UV light source for spectroscopy, fluorescence excitation, optical sensing, chemical analysis, biological analysis, inspection instruments, and OEM optical modules.
Is this a DOWA UV LED?
Yes. This product is from the DOWA xFxVL-1H331 series and uses a TO39 hemispherical can package.
What wavelength options are available?
The xFxVL-1H331 series includes 310nm, 325nm, and 340nm wavelength options.
What is the radiant flux of the 340nm version?
The 340nm version provides 1.0mW radiant flux.
What is the forward voltage?
The voltage is 5V at 310nm, 4.5V at 325nm, and 4V at 340nm.
What current does this UV LED use?
The rated current is 40mA.
What package does this product use?
It uses a TO39 package with a hemi lens and φ9mm TO diameter.
What is the beam angle?
This 340nm uv led has a narrow 6° view angle, making it suitable for focused optical paths and precision UV illumination.
Can it be used for UV curing?
It can be used only for selected low-power material response or UV curing tests when the material is sensitive to 340nm and the final UV dose is verified. It is not a high-power curing lamp.
Can it be used for disinfection?
This product should not be promoted as a disinfection light source. It is better suited for spectroscopy, sensing, fluorescence excitation, and analytical equipment.
Is it safe to view directly?
No. Do not look directly at the working UV LED or expose skin and eyes to UV radiation. Use protective eyewear, shielding, and warning labels during testing and integration.
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