## HLMP-CB27-R0ADD: Electronic Specifications and Technical Overview The **HLMP-CB27-R0ADD** is a high-brightness Blue LED manufactured by Broadcom (formerly Avago). It belongs to the T-1 ¾ (5mm) precision optical performance oval LED series, specifically designed for outdoor applications such as signs and signals. ### 1. Key Technical Specifications | Parameter | Specification | Details | | :--- | :--- | :--- | | **Technology** | InGaN | Indium Gallium Nitride (High Efficiency) | | **Color** | Blue | Peak Wavelength typically ~470nm | | **Luminous Intensity** | 460 - 1150 mcd | Measured at 20mA | | **Viewing Angle** | 40° x 100° | Oval spatial radiation pattern | | **Forward Voltage ($V_F$)** | 2.8V - 3.8V | Typical operating range | | **Forward Current ($I_F$)** | 30 mA | Maximum continuous rating | | **Package Type** | T-1 ¾ (5mm) | Standard through-hole | | **Lens Shape** | Oval | Optimized for wide horizontal viewing | --- ### 2. Detailed Part Number Breakdown The part number follows a specific nomenclature used by Broadcom to define the LED's characteristics: * **HLMP-CB**: Series designation (Blue InGaN Oval LEDs). * **27**: Refers to the viewing angle and specific optical design (40° x 100°). * **R**: Minimum Intensity Bin (starting at approx. 460 mcd). * **0**: Maximum Intensity Bin (0 denotes no upper limit specified other than standard range). * **ADD**: Packaging and mechanical options (typically refers to Bulk or specific lead frame finish). --- ### 3. Core Electronic Features #### A. Optical Performance The "Oval" lens design is critical for electronic signage. It directs more light horizontally than vertically, which is ideal for electronic billboards where viewers are spread across a wide street but are not looking from high above or directly below the sign. #### B. Material Composition (InGaN) This LED utilizes **InGaN (Indium Gallium Nitride)** technology on a Sapphire substrate. Compared to older technologies, InGaN offers: * Superior thermal stability. * Higher brightness levels for blue and green spectrums. * Resistance to electrostatic discharge (ESD) up to 1000V (HBM). #### C. Driving Characteristics To integrate this into a circuit, a current-limiting resistor is required. Using the standard formula: `R = (V_supply - V_F) / I_F` ```python # Example Calculation for a 5V System v_supply = 5.0 v_f = 3.2 # Typical forward voltage i_f = 0.02 # 20mA recommended operating current resistor_value = (v_supply - v_f) / i_f print(f"Required Resistor: {resistor_value} Ohms") # Result: 90 Ohms (Use 100 Ohms standard) ``` --- ### 4. Applications * **Variable Message Signs (VMS):** Highway traffic alerts. * **Full-Color Signage:** Used as the blue pixel in RGB displays. * **Commercial Advertising:** Outdoor billboards.