The **BTL-51YEC-Y2-R** is an electronic component primarily used in signaling and display applications. Based on its nomenclature, it is a **5mm Yellow LED (Light Emitting Diode)** with specific optical and physical characteristics. ### 1. General Specifications The following table outlines the typical technical parameters for this type of LED component: | Parameter | Description | | :--- | :--- | | **Part Number** | BTL-51YEC-Y2-R | | **LED Type** | Through-hole (Radial) | | **Diameter** | 5mm (T-1 3/4) | | **Color** | Yellow (Approx. 585nm - 595nm) | | **Lens Appearance** | Yellow Diffused / Color Tinted | | **Luminous Intensity** | Standard brightness (mcd range varies by batch) | | **Viewing Angle** | Generally 30° to 60° (due to diffusion) | --- ### 2. Electrical Characteristics To operate this component safely without burning the diode, the following electrical limits must be observed: * **Forward Voltage ($V_f$):** Typically **1.8V to 2.4V**. * **Forward Current ($I_f$):** Rated at **20mA** for continuous operation. * **Peak Forward Current:** Up to **100mA** (at 1/10 duty cycle, 0.1ms pulse width). * **Reverse Voltage ($V_r$):** Maximum **5V**. * **Power Dissipation:** Approximately **60mW - 75mW**. --- ### 3. Physical Construction The "Y2-R" suffix often indicates specific manufacturing standards or packaging styles (such as RoHS compliance or Bulk/Ammo pack). * **Anode (+):** The longer lead. * **Cathode (-):** The shorter lead, usually marked by a flat side on the LED epoxy base. * **Diffused Lens:** The "EC" or "Y" in the code often refers to a diffused lens, which scatters light to provide a wide viewing angle, making it ideal for indicator lights rather than spot lighting. ### 4. Application Use Cases 1. **Status Indicators:** Power-on lights for consumer electronics. 2. **Control Panels:** Industrial signal displays. 3. **Backlighting:** Small LCD or button illumination. 4. **DIY Electronics:** Breadboard prototyping and hobbyist projects. ---