The **SML-R13BTT87P** is a high-brightness surface-mount (SMD) LED manufactured by **Rohm Semiconductor**. It belongs to the SML-R13 series, known for its compact "0603" (1608 metric) package size and high reliability. --- ### 1. Technical Specifications The following table outlines the primary electrical and optical characteristics of the SML-R13BTT87P: | Parameter | Specification | | :--- | :--- | | **Color** | Red | | **Material** | AlGaInP (Aluminum Gallium Indium Phosphide) | | **Package Size** | 1.6mm x 0.8mm (0603 inch / 1608 metric) | | **Luminous Intensity** | 25 mcd to 63 mcd (typical) | | **Forward Voltage ($V_F$)** | 1.9V (typical) | | **Forward Current ($I_F$)** | 20mA (Max rating) | | **Peak Wavelength** | 630 nm | | **Operating Temperature** | -40°C to +85°C | | **Mounting Type** | Surface Mount (SMD) | --- ### 2. Key Features * **High Brightness:** Utilizes AlGaInP technology, which offers superior light output compared to older GaAsP technologies. * **Compact Footprint:** The 0603 package is ideal for high-density circuit boards where space is limited. * **Reliability:** Designed for industrial and consumer electronics with a stable operating temperature range. * **Automotive Grade:** Often used in applications requiring AEC-Q101 equivalent reliability standards. --- ### 3. Pinout and Internal Structure The device is a simple two-terminal diode. In the SMD package, the orientation is usually marked by a physical notch or a colored line on the underside/side of the component. ```markdown [ Cathode (-) ] -------|<|------- [ Anode (+) ] | | Marked Side Plain Side ``` --- ### 4. Common Applications Due to its small size and red color, this LED is commonly found in: 1. **Status Indicators:** Power-on lights for laptops, routers, and chargers. 2. **Backlighting:** Lighting up buttons or LCD screens in handheld devices. 3. **Automotive Interiors:** Dashboard illumination and switch lighting. 4. **Consumer Electronics:** Wearables and smart home appliances. --- ### 5. Recommended Drive Circuit To prevent damage, a current-limiting resistor must be used in series. **Calculation Example:** If using a 5V supply: `R = (V_supply - V_f) / I_f` `R = (5V - 1.9V) / 0.02A = 155 Ohms` (Use a standard **160Ω** or **180Ω** resistor).