The **B2LA-R** refers to a specific type of **Surface Mount Device (SMD) LED**, typically categorized under the 0805 (2012 Metric) package size. It is widely used in indicator panels, backlighting, and consumer electronics. --- ### 1. Technical Specifications The "B2LA-R" usually signifies a **Red** ultra-bright LED. Below are the typical electrical and optical characteristics: | Parameter | Typical Value | Unit | | :--- | :--- | :--- | | **Color** | Red | - | | **Dominant Wavelength** | 620 - 630 | nm | | **Forward Voltage ($V_f$)** | 1.8 - 2.4 | V | | **Forward Current ($I_f$)** | 20 | mA | | **Luminous Intensity** | 50 - 150 | mcd | | **Viewing Angle** | 120 - 140 | Degrees | | **Operating Temp** | -40 to +85 | °C | --- ### 2. Physical Dimensions (0805 Package) The "B2L" series often conforms to the standard 0805 footprint, which is compact and suitable for automated PCB assembly. * **Length:** 2.0 mm * **Width:** 1.25 mm * **Height:** 0.8 mm to 1.1 mm (depending on lens type) --- ### 3. Circuit Integration When designing a circuit for the B2LA-R, a current-limiting resistor is mandatory to prevent burnout. **Example Calculation:** To run the LED at 20mA from a 5V power supply: ```text R = (V_source - V_forward) / I_forward R = (5V - 2.0V) / 0.02A R = 150 Ohms ``` ### 4. Key Features * **Low Power Consumption:** Ideal for battery-powered devices. * **High Reliability:** Long operational life (often 50,000+ hours). * **SMT Design:** Compatible with infrared (IR) reflow soldering processes. * **Polarity:** Indicated by a green mark or a notch on the cathode (-) side of the underside. --- ### 5. Common Applications 1. **Status Indicators:** Power ON/OFF lights on routers or laptops. 2. **Backlighting:** Illuminating LCD screens or membrane switches. 3. **Automotive:** Dashboard icons and interior ambient lighting. 4. **Wearables:** Compact light indicators for fitness trackers.