3mm Dual‑Color LED (Green/Red, Common Cathode) 🔴🟢

This 3mm dual‑color LED combines green and red emitters in a single compact package with a common cathode configuration. It’s an ideal indicator for Arduino, Raspberry Pi, and other microcontroller projects, offering clear status signaling while conserving PCB space in electronics components and modules.

Key Features ✅

• Dual‑color output: Independently drive green and red to indicate multiple states with one LED.
• Common cathode: Shared ground simplifies low‑side driving from GPIOs or transistor stages.
• Compact 3mm package: Space‑saving indicator for panels, PCBs, and tight enclosures.
• Defined 30° viewing angle: Focused beam for clear front‑panel visibility.
• Standard 20 mA operation: Works with typical current‑limited LED drivers and microcontroller outputs.

Technical Specifications 📊

• Diameter: 3 mm
• Colors: Green and Red
• Configuration: Common Cathode
• Forward Voltage (VF): Green: 3.0–3.2 V; Red: 2.0–2.2 V (at IF ≈ 20 mA)
• Forward Current (IF): 20 mA per color (typical)
• Luminous Intensity: Green: 60–80 mcd; Red: 40–60 mcd
• Viewing Angle: 30°

Typical Applications 🧩

• Indicator lights: Power, status, error/OK, charge/standby, and mode signaling.
• Electronic devices: Front‑panel indicators for instruments, test gear, and DIY electronics projects.
• Decorative or mood lighting: Simple two‑color effects in compact builds.

Integration Tips for Arduino & Raspberry Pi 🔧

• Current‑limiting resistors are required. Calculate R ≈ (Vsup − VF) / IF.

• 5 V (Arduino):

  • Green: R ≈ (5 − 3.1) / 0.02 ≈ 95 Ω → use 100–150 Ω.
  • Red: R ≈ (5 − 2.1) / 0.02 ≈ 145 Ω → use 150–220 Ω.

• 3.3 V (Raspberry Pi): GPIOs are limited in current; target 2–8 mA. Use 220–680 Ω per color for safe operation and adequate brightness.
• Wiring: Tie the common cathode to GND. Drive each color’s anode through its own resistor from a GPIO or LED driver.
• Note: Forward voltage varies with current and temperature. Adjust resistor values to suit your brightness and power budget.

Why Choose This LED? 🌟

• Two indicators in one part to simplify BOM and save board space.
• Engineer‑friendly specs for accurate design: defined VF ranges, intensity, and beam angle.
• Perfect for prototyping on breadboards and integrating into microcontroller systems and modules.