The **ALTG-322-R** is a specific electronic component, typically categorized as a **Surface Mount Device (SMD) LED**. It is widely used in backlighting, status indication, and decorative lighting due to its small footprint and reliability. --- ### 1. Technical Specifications Below are the general electrical and physical characteristics typically associated with the ALTG-322-R series: | Parameter | Specification (Typical) | | :--- | :--- | | **Component Type** | SMD LED (Top View) | | **Package Size** | 1206 (3.2mm x 1.6mm) | | **Color** | Red | | **Forward Voltage ($V_F$)** | 1.8V - 2.4V | | **Forward Current ($I_F$)** | 20mA (Nominal) | | **Luminous Intensity** | 50 - 150 mcd (varies by bin) | | **Viewing Angle** | 120° - 140° | | **Lens Type** | Water Clear or Diffused | --- ### 2. Pinout and Orientation The ALTG-322-R follows standard polarity conventions for SMD LEDs. * **Anode (+):** Usually indicated by the absence of a mark or the side with the longer trace. * **Cathode (-):** Often marked with a green line, a notch, or a T-shaped mark on the underside of the PCB. ### 3. Key Electronic Features * **Thermal Management:** The 1206 package provides a decent surface area for heat dissipation compared to smaller 0603 or 0402 packages. * **Reliability:** Designed for automated "Pick and Place" assembly. * **Color Consistency:** Uses AlGaInP (Aluminium Gallium Indium Phosphide) technology for stable red light emission. --- ### 4. Application Circuit Example To use this part in a 5V digital circuit, a current-limiting resistor is required. **Calculation:** $R = \frac{V_{source} - V_F}{I_F}$ $R = \frac{5V - 2.0V}{0.02A} = 150\Omega$ ```cpp // Example: Driving the LED via an Arduino Pin void setup() { pinMode(13, OUTPUT); // Pin connected to Anode via 150 ohm resistor } void loop() { digitalWrite(13, HIGH); // LED On delay(1000); digitalWrite(13, LOW); // LED Off delay(1000); } ``` ---