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

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

The 5mm diffused yellow LED is the standard general-purpose warning and caution indicator LED for Arduino, breadboard, and custom PCB projects. Yellow is the universal caution/warning color in electronics and traffic signaling — instantly communicating a standby, processing, or warning state. Whether you’re building a traffic light project, a battery level indicator, or a multi-state status display, the yellow LED is the essential middle signal.

The diffused lens scatters light evenly across a wide viewing angle, providing omnidirectional visibility. Yellow LEDs have a forward voltage of approximately 2.0–2.2V, 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

• 5mm through-hole package — breadboard and PCB compatible; standard LED footprint
• Diffused lens — wide viewing angle (~120°) for omnidirectional visibility
• Yellow color — universal caution/warning/standby indicator color
• Forward voltage ~2.0–2.2V — compatible with 3.3V and 5V Arduino circuits
• 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 220–330Ω current-limiting resistor
• Connect the cathode (shorter leg) to GND
• Set the digital pin HIGH to turn on, LOW to turn off
• For PWM dimming: use analogWrite(pin, value) with value 0–255

Typical Applications

• Warning and caution indicators — yellow is the universal caution/warning color
• Traffic light Arduino projects — yellow signal in traffic light and intersection projects
• Battery level indicators — medium charge level indicator in battery status displays
• Standby and processing indicators — indicates system is active but not ready
• Custom PCB status indicators — warning and mode indicators on custom PCBs
• Educational electronics kits — STEM and electronics learning projects

Technical Specifications

• Size: 5mm (T-1 3/4)
• Color: Yellow
• Lens: Diffused
• Forward Voltage (Vf): ~2.0–2.2V
• 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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