The **SML-R12UTT87P** is a high-brightness surface-mount (SMD) LED manufactured by **Rohm Semiconductor**. It belongs to the SML-R12 series, which is characterized by its compact size and high reliability. --- ### 1. General Specifications Below are the primary electrical and optical characteristics of the SML-R12UTT87P: | Feature | Specification | | :--- | :--- | | **Emitting Color** | Red | | **Material** | AlGaInP (Aluminum Gallium Indium Phosphide) | | **Package Size** | 1608 Metric (0603 Inch) | | **Dimensions** | 1.6mm x 0.8mm x 0.6mm | | **Luminous Intensity** | ~40 mcd to 100 mcd (at 20mA) | | **Forward Voltage ($V_F$)** | Typically 2.1V | | **Dominant Wavelength** | 624 nm | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Key Internal Components The part is composed of several critical layers and materials: 1. **LED Die (AlGaInP):** The semiconductor chip that converts electrical energy into red light. AlGaInP is used because it provides higher efficiency and brightness compared to older GaAsP technologies. 2. **Lead Frame:** The metal base (often gold-plated) that provides electrical connectivity and aids in heat dissipation. 3. **Encapsulating Resin:** A clear epoxy or silicone resin that protects the die from moisture and mechanical damage while allowing light to pass through. 4. **Cathode Mark:** A physical notch or marking on the package to indicate polarity (essential for correct PCB mounting). --- ### 3. Application Use Cases This specific LED is designed for space-constrained environments where high visibility is required: * **Status Indicators:** Power lights for consumer electronics (laptops, routers). * **Backlighting:** Illuminating membrane switches and control panels. * **Automotive:** Internal dashboard lighting and console indicators. * **Mobile Devices:** Battery indicators and notification LEDs. --- ### 4. Footprint and Soldering The part uses the **0603 (1608)** standard footprint. In industrial manufacturing, it is typically applied using Solder Paste and Reflow Soldering. ```markdown Recommended Pad Dimensions: - Pad Width: 0.8 mm - Pad Length: 0.6 mm - Gap between Pads: 0.7 mm ``` ---