The **SML-R12Y8T** is a high-brightness surface-mount LED manufactured by **ROHM Semiconductor**. It belongs to the SML-R1 series, known for its compact size and high-reliability performance in various electronic applications. --- ### 1. General Specifications The SML-R12Y8T is characterized by its specific yellow-emitting material and 0603 (1608 Metric) package size. | Parameter | Specification | | :--- | :--- | | **Manufacturer** | ROHM Semiconductor | | **Part Series** | SML-R1 | | **Color** | Yellow | | **Material** | AlGaInP (Aluminum Gallium Indium Phosphide) | | **Package Size** | 0603 (1.6mm x 0.8mm) | | **Luminous Intensity** | 45mcd to 110mcd (typical) | | **Dominant Wavelength** | 590nm (Typical) | --- ### 2. Electrical Characteristics These parameters are critical for circuit design and power management. * **Forward Voltage ($V_F$):** Typically **2.0V** (with a maximum of 2.4V at $I_F = 20mA$). * **Forward Current ($I_F$):** Rated for a maximum continuous current of **20mA**. * **Reverse Voltage ($V_R$):** Rated for **5V**. * **Power Dissipation ($P_D$):** Maximum of **48mW**. * **Operating Temperature:** Ranges from **-40°C to +85°C**. --- ### 3. Mechanical and Optical Features The physical construction of the LED influences how it is mounted and how light is distributed. * **Lens Type:** Usually comes with a **Clear/Transparent** lens for maximum light output. * **Viewing Angle:** Wide viewing angle of approximately **140°**, making it suitable for backlighting and indicators. * **Mounting Type:** Surface Mount (SMD/SMT). * **Tape & Reel:** Supplied in 8mm embossed carrier tape for automated pick-and-place assembly. --- ### 4. Implementation Example When integrating this LED into a logic circuit (e.g., 5V system), a current-limiting resistor is required. ```cpp // Calculation for Resistor (R): // R = (V_source - V_forward) / I_forward // R = (5.0V - 2.0V) / 0.02A // R = 150 Ohms ``` --- ### 5. Common Applications * **Status Indicators:** Power ON/OFF lights for consumer electronics. * **Backlighting:** Illuminating buttons, switches, and LCD panels. * **Automotive:** Internal dashboard lighting and console indicators. * **Industrial:** Signal lights on PLC modules and sensors.