The **SML-R13YTT87P** is a surface-mount LED manufactured by **ROHM Semiconductor**. It belongs to the SML-R1 series, known for its compact 0603 (1608 Metric) footprint and high reliability. --- ### 1. Key Technical Specifications The following table outlines the fundamental electronic characteristics of the SML-R13YTT87P: | Parameter | Specification | | :--- | :--- | | **Color** | Yellow | | **Material** | AlGaInP (Aluminum Gallium Indium Phosphide) | | **Package Size** | 0603 (1.6mm x 0.8mm, Height: 0.36mm) | | **Luminous Intensity** | 25 mcd to 63 mcd (at 20mA) | | **Forward Voltage ($V_F$)** | 1.9 V (Typical) | | **Dominant Wavelength** | 590 nm | | **Operating Temperature** | -40°C to +85°C | | **Mounting Type** | Surface Mount (SMD/SMT) | --- ### 2. Physical Construction and Features * **Ultra-Thin Profile:** With a height of only 0.36mm, this part is ideal for low-profile consumer electronics where vertical space is limited. * **Wavelength Precision:** The 590nm output provides a crisp "Amber/Yellow" light, commonly used for status indicators. * **Reflector Technology:** The series often utilizes high-efficiency mold technology to maximize light output despite its small size. --- ### 3. Application Use Cases The SML-R13YTT87P is frequently integrated into the following systems: 1. **Consumer Electronics:** Indicator lights for smartphones, tablets, and wearables. 2. **Control Panels:** Backlighting for buttons and status displays in industrial interfaces. 3. **Automotive Interiors:** Dashboard illumination and climate control backlighting. 4. **Network Hardware:** Link/Activity status LEDs on routers and switches. --- ### 4. Circuit Implementation Example To drive this LED safely, a current-limiting resistor is required. Using a standard 5V supply: ```python # Simple Resistor Calculation (R = (V_supply - V_forward) / I_target) V_supply = 5.0 # Volts V_forward = 1.9 # Volts (Typical for SML-R13YTT87P) I_target = 0.02 # 20mA target current resistor_value = (V_supply - V_forward) / I_target print(f"Required Resistor: {resistor_value} Ohms") # Result: 155 Ohms ```