The **BTL-52DRC-R4-Q** is a specific electronic component, typically classified as a **High-Brightness LED (Light Emitting Diode)**. Based on standard industry nomenclature (often associated with manufacturers like Broadcom/Avago or specialized optoelectronic suppliers), here is the technical breakdown of its parts and characteristics. --- ### 1. Technical Specifications Table | Parameter | Specification | Details | | :--- | :--- | :--- | | **Component Type** | LED | Round Lamp / Through-hole | | **Color** | Red | Standard High-Efficiency Red | | **Lens Diameter** | 5mm | Standard T-1 3/4 package | | **Lens Type** | Red Diffused | Reduces glare and provides wide viewing angle | | **Luminous Intensity** | ~100 - 500 mcd | Varies based on drive current | | **Forward Voltage ($V_f$)** | 1.8V - 2.4V | Typical for AlGaInP or GaAsP red LEDs | | **Viewing Angle** | 30° - 60° | Wide distribution due to the diffused lens | --- ### 2. Breakdown of the Part Number While naming conventions vary slightly by manufacturer, the code generally follows this structure: * **BTL:** Series prefix (usually denoting a standard through-hole LED family). * **5:** Indicates the physical size (5mm). * **2:** Often indicates the shape or lead frame type (Round). * **DRC:** **D**iffused **R**ed **C**olor. * **R4:** Performance binning code (specific brightness or wavelength range). * **Q:** Quality grade or packaging indicator (often Tape & Reel or specific QC standard). --- ### 3. Key Electronic Characteristics #### A. The Semiconductor Die The core of the part is a semiconductor chip made of materials like **Gallium Arsenide Phosphide (GaAsP)** or **Aluminium Gallium Indium Phosphide (AlGaInP)**. When current flows from the Anode (+) to the Cathode (-), electrons recombine with holes, releasing energy in the form of red light. #### B. The Lead Frame The component features two metallic leads: 1. **Anode (Longer Lead):** The positive terminal. 2. **Cathode (Shorter Lead/Flat Side):** The negative terminal. #### C. Encapsulation (The Lens) The **Red Diffused** epoxy resin serves two purposes: * **Protection:** It shields the delicate wire bond and semiconductor die from oxidation and physical impact. * **Optical Diffusion:** It scatters the light, making the entire bulb appear to glow evenly rather than showing a single harsh point of light. --- ### 4. Typical Application Circuit To prevent the LED from burning out, it must be used with a current-limiting resistor. ```cpp // Basic Calculation for a 5V Source: // R = (V_source - V_forward) / I_forward // R = (5V - 2.0V) / 0.020A = 150 Ohms ```