Blue LED 5mm Diffused — General Purpose, 10-Pack

Blue LED 5mm Diffused — General Purpose, 10-Pack for Arduino, Breadboard & PCB Projects

The 5mm diffused blue LED is the standard general-purpose blue indicator LED for Arduino, breadboard, and custom PCB projects. With a diffused lens that scatters light evenly across a wide viewing angle, this LED is visible from virtually any direction — making it the preferred choice for status indicators, power-on lights, and any application where omnidirectional visibility is important.

Blue LEDs have a higher forward voltage than red, yellow, and green LEDs (typically 3.0–3.4V), making them ideal for 3.3V and 5V Arduino circuits with a current-limiting resistor. The 5mm through-hole package is breadboard-compatible and fits standard PCB LED footprints. Supplied in a 10-pack for prototyping and small production runs.

Key Features

• 5mm through-hole package — breadboard and PCB compatible; standard LED footprint
• Diffused lens — wide viewing angle for omnidirectional visibility
• Blue color — high-visibility status, power, and connectivity indicator
• Standard 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

• Power-on and status indicators — blue is widely used for power and connectivity status
• Arduino beginner projects — the classic first Arduino project LED
• Breadboard prototyping — quick indicator for circuit testing and debugging
• Custom PCB indicators — status, mode, and connectivity indicators on custom PCBs
• Robotics and automation — status and mode indicator LEDs
• Educational electronics kits — STEM and electronics learning projects

Technical Specifications

• Size: 5mm (T-1 3/4)
• 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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