The **LSMT2-42551-R** is an advanced **Surface Mount Device (SMD) LED Indicator** manufactured by **Broadcom (formerly Avago Technologies)**. It belongs to the Envisium™ Power PLCC-4 surface mount LED series, designed for high-performance brightness and thermal efficiency. --- ### ## Technical Specifications The following table outlines the primary electronic and physical characteristics of the LSMT2-42551-R: | Parameter | Specification | | :--- | :--- | | **Material Technology** | AlInGaP (Aluminum Indium Gallium Phosphide) | | **Color** | Super Red (630nm typical) | | **Luminous Intensity** | 450 mcd to 1125 mcd (at 50mA) | | **Forward Current ($I_f$)** | 50 mA | | **Forward Voltage ($V_f$)** | 2.2V typical / 2.8V max | | **Viewing Angle** | 120° | | **Package Type** | PLCC-4 (Plastic Leaded Chip Carrier) | | **Operating Temperature** | -40°C to +100°C | --- ### ## Key Electronic Features #### 1. Heat Management The PLCC-4 package features a specialized lead frame that allows for lower thermal resistance. Unlike standard 2-pin LEDs, the 4-pin configuration enables better heat dissipation from the die to the PCB, allowing the LED to be driven at higher currents (50mA) without overheating. #### 2. High Luminous Efficiency The AlInGaP material technology provides high light output per watt. This makes it suitable for applications where visibility is required in high-ambient light conditions (like direct sunlight). #### 3. Moisture Sensitivity Level (MSL) This part is typically rated at **MSL 2a**, meaning it has a floor life of 4 weeks after opening the vacuum-sealed bag, provided the storage conditions are maintained correctly ($\leq 30^\circ\text{C}/60\% \text{RH}$). --- ### ## Common Applications * **Automotive:** Interior lighting (dashboard, console), exterior signaling (CHMSL/Third brake lights). * **Industrial:** Status indicators for heavy machinery and control panels. * **Signage:** Backlighting for displays and channel letters. ---