The **LCY-111W-R** is a specific surface-mount technology (SMT) electronic component, primarily recognized as a high-brightness **LED (Light Emitting Diode)**. It is manufactured by companies like ROHM Semiconductor and is commonly used in indicator panels and backlight units. --- ### 1. Technical Specifications The LCY-111W-R belongs to the "SML-D1" series or similar chip LED families. Below are the typical technical characteristics: | Parameter | Specification (Typical) | |:---|:---| | **Component Type** | SMD LED | | **Color** | Yellow / Amber | | **Wavelength** | ~590 nm | | **Package Size** | 1608 (Metric) / 0603 (Inch) | | **Luminous Intensity** | 16 - 40 mcd | | **Forward Voltage ($V_F$)** | 2.0V - 2.4V | | **Forward Current ($I_F$)** | 20mA (Max) | | **Operating Temp** | -40°C to +85°C | --- ### 2. Key Features * **Miniature Size:** The 0603 footprint (1.6mm x 0.8mm) makes it ideal for high-density circuit boards. * **High Reliability:** Designed for consistent brightness and thermal stability. * **Reflow Soldering:** Compatible with standard industrial infrared and convection reflow processes. * **Packaging:** Usually supplied in Tape and Reel (T&R) format for automated pick-and-place machines. --- ### 3. Pinout and Polarity Like most SMD LEDs, the LCY-111W-R has two terminals. Identifying polarity is crucial during PCB assembly: 1. **Anode (+):** The positive terminal. 2. **Cathode (-):** The negative terminal, usually marked on the bottom of the casing with a "T" shape, a notch, or a green colored mark. --- ### 4. Application Circuit Example To prevent damage, this LED must be used with a current-limiting resistor. ```cpp // Basic Calculation for a 5V Supply: // R = (V_supply - V_forward) / I_forward // R = (5V - 2.0V) / 0.010A (targeting 10mA for longevity) // R = 300 Ohms ``` ---