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

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

The 3mm diffused yellow LED is the compact general-purpose warning and status 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. Yellow is the universal caution/warning color in electronics — instantly communicating a standby, processing, or warning state to the user.

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.

Key Features

• 3mm through-hole package — compact size for space-constrained PCB layouts
• Diffused lens — wide viewing angle (~120°)
• Yellow color — universal caution/warning/standby indicator color
• Forward voltage ~2.0–2.2V — compatible with 3.3V and 5V circuits
• 10-pack

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

Typical Applications

• Warning and caution indicators — yellow is the universal caution/warning color
• Traffic light Arduino projects — yellow signal in traffic light projects
• Standby and processing indicators — indicates system is active but not ready
• Compact PCB status indicators — warning and mode indicators on miniature PCBs
• Wearable electronics — small LED indicators for wearable devices
• Educational electronics kits — STEM and electronics learning projects

Technical Specifications

• Size: 3mm (T-1)
• 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