3mm 395nm UV LED Diodes (3-Pack) | 3.0-3.4V Ultraviolet Light
3mm 395nm UV LED Diodes (3-Pack) | 3.0-3.4V Ultraviolet Light
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Short Product Description
Short Product Description
This 3-pack of 3mm 395nm UV LED diodes delivers precise ultraviolet light for custom electronics, resin curing, and fluorescence detection. Featuring a water-clear T-1 lens, these diodes operate efficiently at 3.0V-3.4V and 20mA, providing a focused 20° to 30° viewing angle. Perfect for DIY makers and technicians building custom black lights or currency verification tools. Available in-stock at Sun Cheong Computer Co. Ltd. (新昌電腦有限公司) in Sham Shui Po for immediate project integration.
Key Features
Key Features
- Targeted 395nm Wavelength: Emits precise UVA light ideal for fluorescence detection, resin curing, and security verification.
- Focused Light Output: The 20° to 30° viewing angle concentrates the UV beam for higher intensity over a specific target area.
- Energy Efficient: Operates at a low 20mA forward current, making them excellent for portable, battery-powered DIY projects.
- Water-Clear Lens: The transparent 3mm T-1 epoxy casing ensures maximum light transmission without diffusion.
- Standard Through-Hole Design: Long, easily bendable leads allow for quick insertion into breadboards or secure through-hole soldering.
Full Product Description
Full Product Description
Precise 395nm Ultraviolet Wavelength for Practical Applications
These 3mm light-emitting diodes operate at a specific 395nm to 400nm wavelength, placing them right on the border of visible violet light and UVA. This specific spectrum is highly effective for exciting fluorescent materials, making these LEDs ideal for building custom banknote verification tools, detecting UV-reactive security strips, or creating "black light" effects for displays. Additionally, the 395nm wavelength provides enough energy to cure UV-sensitive resins and adhesives commonly used in jewelry making and micro-electronics repair.
Standard 3mm T-1 Package for Easy Breadboard Integration
Designed with a standard 3mm water-clear epoxy lens (T-1 package), these diodes fit effortlessly into standard 2.54mm pitch breadboards, custom PCBs, and tight 3D-printed housings. Operating at a standard forward current of 20mA and a forward voltage of 3.0V to 3.4V, they are highly power-efficient and perfectly suited for battery-operated handheld devices. The narrow 20° to 30° viewing angle concentrates the ultraviolet output into a focused beam, maximizing the UV intensity exactly where you point it.
Technician Tip
Because these UV LEDs have a forward voltage (Vf) of 3.0V to 3.4V, you must use a current-limiting resistor if you are powering them from a standard 5V source (like an Arduino or USB power). A 100-ohm resistor connected in series will safely limit the current to approximately 20mA, preventing the diode from burning out. If you are building a custom UV curing box or testing circuit, drop by our physical store at Sun Cheong Computer Co. Ltd. in Sham Shui Po—our staff can help you calculate and select the exact resistors you need.
Technical Specifications
Technical Specifications
- Component Type: UV LED (Light Emitting Diode)
- Package Size: 3mm (T-1) Round Head
- Lens Color: Water Clear
- Emitted Color: UV Purple / Violet
- Wavelength: 395nm – 400nm
- Forward Voltage (Vf): 3.0V – 3.4V (Typical)
- Forward Current (If): 20mA
- Viewing Angle: Approx. 20° – 30°
- Quantity: 3 Pieces per pack
Delivery Options
Delivery Options
- Local delivery within Hong Kong and in-store pickup.
- Free shipping for orders of HK$400 or above; HK$35 shipping fee for orders below HK$400.
- Shipped by SF Express, usually dispatched the same day for orders confirmed before 6:00 PM (Mon–Sat).
- Estimated delivery time: 1–3 business days after dispatch (Hong Kong).
- In-store pickup details (location and time) will be confirmed by email or phone message.
- Delivery times are estimates and may be affected by weather or unforeseen circumstances.
FAQ Section
FAQ Section
Do I need a resistor to use these LEDs with a 5V power supply?
Yes, you must use a current-limiting resistor when connecting these LEDs to a 5V power source. Since the forward voltage is 3.0V-3.4V, connecting them directly to 5V will draw too much current and instantly burn out the diode. A 100-ohm resistor is recommended for a 5V supply.
What is the difference between 395nm and 365nm UV LEDs?
395nm LEDs emit a slight visible purple glow alongside the UV light and are excellent for curing resins and general fluorescence. 365nm LEDs emit almost no visible light and are typically used for professional forensic inspection, though they are generally more expensive.
Can these LEDs cure UV resin or nail polish?
Yes, the 395nm wavelength is highly effective for curing standard UV-sensitive resins and adhesives. However, because these are 3mm diodes, the coverage area is small, making them best suited for spot-curing tiny drops of resin in electronics repair or jewelry making.
How do I identify the positive and negative legs of the LED?
The longer metal leg is the positive terminal (anode), and the shorter leg is the negative terminal (cathode). Additionally, if you look closely at the base of the plastic lens, there is a flat edge on the negative (cathode) side.
Are these UV LEDs available for immediate pickup in Hong Kong?
Yes, we stock these 3mm 395nm UV LED 3-packs at our Sham Shui Po physical store. You can order them online for delivery or visit us during business hours for immediate pickup for your electronics project.
Target Users / Applications
Target Users / Applications
- Electronics Repair Technicians: Spot-curing UV solder mask (green oil) on PCB traces and micro-soldering joints.
- STEM Students & Educators: Building simple circuits to demonstrate fluorescence, light wavelengths, and basic diode operation.
- Custom Keyboard Makers: Integrating UV underglow lighting to react with fluorescent keycaps or acrylic cases.
- DIY Makers: Building custom, battery-operated handheld currency verification tools for checking HKD banknotes.
