Based on the part number provided, the **BTL-52DRC-R2-Q** is a high-performance **Red LED Lamp**, typically used in industrial indicators, signage, and backlighting. It is designed for high reliability and consistent optical output. --- ## Technical Specifications | Parameter | Specification | Details | | :--- | :--- | :--- | | **Emitted Color** | Red | High-intensity visible red light | | **Wavelength** | ~620nm - 630nm | Peak emission wavelength | | **Lens Type** | Water Clear | Transparent lens for maximum light focus | | **Package Type** | T-1 3/4 (5mm) | Standard through-hole cylinder/dome package | | **Forward Voltage ($V_F$)** | ~1.8V - 2.4V | Typical operating voltage range | | **Luminous Intensity** | High mcd rating | Designed for high brightness applications | | **Viewing Angle** | ~20° - 30° | Narrow beam angle for directional lighting | --- ## Key Components & Construction ### 1. The Semiconductor Die (Chip) The "Heart" of the BTL-52DRC is an **AlGaInP (Aluminium Gallium Indium Phosphide)** semiconductor. This material is chosen for red LEDs because it offers high efficiency and long-term stability under varying temperatures. ### 2. Lead Frame and Packaging * **Anode and Cathode:** Standard two-lead configuration for through-hole PCB mounting. * **Epoxy Resin:** The "52" in the part number often refers to the 5mm diameter housing. The resin is UV-stabilized to prevent yellowing over time. ### 3. Internal Reflector The die is placed within a reflective cup on the lead frame to ensure that photons are directed upward through the lens, maximizing the **Luminous Intensity (mcd)**. --- ## Part Number Breakdown (Typical) While naming conventions vary slightly by manufacturer (often *Betlux* or similar optics firms), the code generally breaks down as follows: * **BTL:** Series prefix (Manufacturer specific). * **52:** Refers to the **5mm** (T-1 3/4) standard size. * **DRC:** **D**eep **R**ed / **C**lear lens. * **R2:** Binning or revision code (specifying a certain range of brightness/voltage). * **Q:** Quality grade or specific packaging (e.g., bulk vs. taped). --- ## Typical Applications 1. **Status Indicators:** Power-on lights for machinery or consumer electronics. 2. **Outdoor Signage:** Variable message signs due to the high-contrast red light. 3. **Circuit Protection:** Used in series with resistors as a visual fault indicator.