LED 3mm Red 🔴 – Compact, Efficient Indicator LED for Prototyping and Production

This 3 mm red LED is a classic through-hole indicator ideal for Arduino, Raspberry Pi, and other microcontroller projects. It offers bright, reliable illumination with low power consumption, making it a staple in electronics components kits for engineers and hobbyists alike.

Understanding 3 mm LEDs 📘

LEDs (Light Emitting Diodes) are semiconductor devices that emit light when forward-biased. A 3 mm (T-1) package provides a compact footprint for dense PCBs and tight enclosures while delivering high visibility. Compared to traditional lamps, LEDs deliver high brightness, energy efficiency, and long service life.

Key Features ✅

• 3 mm through-hole package for compact designs and breadboard-friendly leads.
• Red emission suitable for status indicators, alerts, and UI feedback.
• Low forward voltage and low current operation for excellent efficiency.
• Minimal heat generation for reliable, continuous operation.
• Compatible with Arduino, Raspberry Pi, and other microcontroller modules.
• Supports PWM dimming for brightness control.

Applications 🧰

• Indicators: power, status, and signal activity on PCBs and front panels.
• Displays: simple bar-graphs or segment-like arrays.
• Sensors and feedback: visual alerts in embedded systems.
• Prototyping: breadboard experiments, DIY kits, and training labs.
• Portable devices and battery-powered modules where efficiency matters.
• Industrial and automotive indicator panels (with appropriate design and derating).

Advantages over Traditional Lighting 💡

• Lower energy consumption than halogen or fluorescent lamps.
• Long lifespan with solid-state reliability and shock resistance.
• Compact size enables dense layouts and sleek product designs.
• Low heat output reduces thermal management requirements.

Features and Technology 🌟

Modern LEDs support brightness control via PWM and offer consistent color output. Ongoing development continues to improve efficiency, luminous intensity, and reliability, expanding their use across consumer, industrial, and maker applications.

Typical Electrical Characteristics (for standard 3 mm red LEDs) 📐

Note: Values above are typical for standard 3 mm red indicator LEDs and may vary by manufacturer and batch. Always verify with the device’s datasheet when available.

Polarity and Pinout 🔌

• Anode (+): longer lead.
• Cathode (−): shorter lead and side with the flat edge on the LED flange.

Using with Arduino, Raspberry Pi, and Other Microcontrollers 🤖

Always use a current-limiting resistor in series with the LED to prevent overcurrent. Calculate the resistor value with Ohm’s law:
R = (VCC − Vf) / If

• Example at 5 V: R ≈ (5 V − 2.0 V) / 0.01 A ≈ 300 Ω → use a 330 Ω standard value.
• Example at 3.3 V: R ≈ (3.3 V − 2.0 V) / 0.01 A ≈ 130 Ω → use 150 Ω or 220 Ω for a safer current.

Drive the LED from a GPIO pin through the resistor, or use a transistor if higher current or multiple LEDs are required. PWM-capable pins enable brightness control.

Best Practices ⚙️

• Observe polarity to avoid reverse-bias damage.
• Derate current for continuous operation and higher ambient temperatures.
• Use appropriate series resistors to match your supply voltage and desired brightness.

In the Box 📦

• 1 x 3mm Red LED (through-hole)