### Overview of HSMM-A401-R7YM2 The **HSMM-A401-R7YM2** is a high-performance Surface Mount (SMD) Light Emitting Diode (LED) manufactured by Broadcom (formerly Avago Technologies). It belongs to the **Power PLCC-4** family, specifically designed for high reliability and high-intensity output in demanding environments. --- ### Technical Specifications Below are the primary electronic and optical characteristics for this specific part: | Parameter | Specification | | :--- | :--- | | **Color** | InGaN Green | | **Dominant Wavelength** | 525 nm (Typical) | | **Luminous Intensity** | 560 mcd to 1400 mcd | | **Forward Voltage ($V_F$)** | 3.2V (Typical) / 3.9V (Max) | | **Forward Current ($I_F$)** | 30 mA | | **Viewing Angle** | 120° | | **Package Type** | PLCC-4 (Plastic Leaded Chip Carrier) | | **Operating Temperature** | -40°C to +100°C | --- ### Key Features 1. **Material Technology:** Utilizes **InGaN** (Indium Gallium Nitride) technology, which allows for high luminous efficiency and superior brightness in the green spectrum. 2. **Package Design:** The PLCC-4 package features a built-in reflector that increases light output intensity. It has four leads, providing better thermal dissipation compared to standard PLCC-2 packages. 3. **Durability:** The device is silicone-encapsulated, making it highly resistant to UV degradation and thermal stress, ensuring a long operational life. 4. **Compatibility:** Fully compatible with automated surface mount assembly (Pick-and-Place) and IR/convection reflow soldering processes. --- ### Pin Configuration (PLCC-4) Unlike standard 2-pin LEDs, the PLCC-4 package allows for better heat management. The internal connections for the HSMM-A401-R7YM2 are typically arranged as follows: ```text Pin 1: Cathode Pin 2: Anode Pin 3: Cathode Pin 4: Cathode ``` *Note: Multiple cathode pins are often used to sink heat away from the LED die into the PCB copper traces.* --- ### Common Applications * **Automotive:** Interior lighting (dashboard, console, switches) and exterior signal lighting. * **Industrial:** Status indicators, control panels, and backlighting for displays. * **Signs/Signals:** Variable message signs and decorative architectural lighting. * **Consumer Electronics:** Backlighting for liquid crystal displays (LCDs).