Blue LED 3mm Diffused — General Purpose, 10-Pack

Blue LED 3mm Diffused — General Purpose, 10-Pack for Arduino, Breadboard & Compact PCB Projects

The 3mm diffused blue LED is the compact general-purpose blue indicator LED for Arduino, breadboard, and space-constrained PCB projects. At 3mm diameter, this LED fits into tight PCB layouts and compact enclosures where standard 5mm LEDs are too large — making it the preferred choice for miniature electronics, wearable projects, and any application where a small footprint is essential.

The diffused lens scatters light evenly across a wide viewing angle, providing omnidirectional visibility even in compact installations. Blue LEDs have a higher forward voltage than red, yellow, and green LEDs (typically 3.0–3.4V), making them compatible with both 3.3V and 5V Arduino circuits with a current-limiting resistor. Supplied in a 10-pack for prototyping and small production runs.

Key Features

• 3mm through-hole package — compact size for space-constrained PCB layouts and miniature enclosures
• Diffused lens — wide viewing angle (~120°) for omnidirectional visibility
• Blue color — high-visibility status, power, and connectivity indicator
• Forward voltage ~3.0–3.4V — compatible with 3.3V and 5V Arduino circuits with resistor
• 10-pack — ideal for prototyping and small production runs
• Long service life — LED technology; no filament to burn out

How to Use with Arduino

• Connect the anode (longer leg) to an Arduino digital output pin through a 100–220Ω current-limiting resistor
• Connect the cathode (shorter leg) to GND
• Set the digital pin HIGH to turn the LED on, LOW to turn it off
• For 3.3V systems: use a 68–100Ω resistor; for 5V systems: use a 150–220Ω resistor

Typical Applications

• Compact PCB status indicators — power-on, connectivity, and mode indicators on miniature PCBs
• Wearable electronics — small LED indicators for wearable and portable devices
• Arduino beginner projects — compact LED for breadboard and shield projects
• Robotics and automation — status and mode indicator LEDs in compact robot builds
• Educational electronics kits — STEM and electronics learning projects

Technical Specifications

• Size: 3mm (T-1)
• Color: Blue
• Lens: Diffused
• Forward Voltage (Vf): ~3.0–3.4V
• Forward Current (If): 20mA (typical)
• Viewing Angle: ~120° (diffused)
• Package: Through-hole, 2-pin
• Quantity: 10 per pack
• Brand: Keszoox
• Origin: Mainland China

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