### SML-R12VWT86P: Part Analysis The **SML-R12VWT86P** is a high-brightness, surface-mount (SMD) Light Emitting Diode (LED) manufactured by **ROHM Semiconductor**. It belongs to the SML-R12 series, characterized by its compact size and high reliability. --- ### Technical Specifications The following table summarizes the core electronic and mechanical parameters of the component: | Feature | Specification | | :--- | :--- | | **Manufacturer** | ROHM Semiconductor | | **LED Color** | Red | | **Wavelength** | 630 nm (Typical) | | **Luminous Intensity** | 25 mcd to 63 mcd @ 20mA | | **Forward Voltage ($V_F$)** | 2.0 V (Typical) | | **Forward Current ($I_F$)** | 20 mA | | **Package Size** | 0603 (1608 Metric) | | **Dimensions** | 1.6mm x 0.8mm x 0.6mm | | **Operating Temperature** | -40°C to +85°C | --- ### Key Electronic Characteristics 1. **Material Technology:** It utilizes **AlGaInP** (Aluminum Gallium Indium Phosphide) technology. This material allows for high efficiency and brightness in the red spectrum compared to older GaAsP technologies. 2. **Luminous Intensity vs. Current:** The brightness is linear to the forward current. While rated for 20mA, it can operate at lower currents (e.g., 2mA to 5mA) for low-power indicator applications, though luminous intensity will decrease proportionally. 3. **Radiation Pattern:** It features a wide viewing angle (typically around 120° to 150°), making it suitable for status indicators that need to be visible from various directions. --- ### Application Design Considerations To integrate this part into a circuit, the following formula is used to calculate the necessary current-limiting resistor ($R$): ```text R = (V_source - V_F) / I_F ``` **Example Calculation:** If using a 5V power supply and aiming for a standard 20mA current: - $V_{source} = 5V$ - $V_F = 2.0V$ - $I_F = 0.02A$ - **Result:** $R = (5 - 2) / 0.02 = 150 \Omega$ --- ### Footprint and Mounting The **0603 package** is industry-standard, making it compatible with high-speed automated pick-and-place machinery. The "T86" in the part number specifically refers to the **Taping Specification**, indicating it is supplied on 8mm embossed plastic carrier tape for automated assembly.