The term **LED34FC** typically refers to a specific type of LED component, often categorized within the **T-1 (3mm)** through-hole package family. These are widely used as indicator lights in consumer electronics, automotive dashboards, and industrial control panels. Below is a technical breakdown of the electronic parts and specifications associated with this component. --- ### 1. Technical Specifications The standard electrical characteristics for an LED of this series are summarized in the table below: | Parameter | Typical Value | Unit | | :--- | :--- | :--- | | **Forward Voltage ($V_f$)** | 2.0 - 3.2 (Color dependent) | Volts (V) | | **Forward Current ($I_f$)** | 20 | Milliamps (mA) | | **Lens Diameter** | 3.0 | Millimeters (mm) | | **Viewing Angle** | 30 - 60 | Degrees (°) | | **Luminous Intensity** | 50 - 500 (Depending on mcd rating) | Millicandela (mcd) | ### 2. Physical Components An LED34FC is comprised of several micro-components housed within the plastic epoxy: 1. **Epoxy Lens/Body:** The "34" usually denotes the 3mm size. The "FC" often indicates a "Flangeless" or "Cylindrical" housing, allowing for flush mounting on panels. 2. **Anode (+):** The longer lead, which connects to the positive terminal of the power supply. 3. **Cathode (-):** The shorter lead, usually marked by a flat edge on the LED’s circular base. 4. **Semiconductor Die:** The actual "heart" of the LED (often Gallium Arsenide or Gallium Nitride) that emits light when current passes through it. 5. **Bond Wire:** A microscopic gold wire connecting the leads to the semiconductor die. ### 3. Circuit Implementation To use an LED34FC safely, you must use a **Current Limiting Resistor** to prevent the component from burning out. **Formula:** `R = (V_source - V_forward) / I_forward` **Example Calculation (for a 5V source):** ```python # Standard LED Calculation source_voltage = 5.0 forward_voltage = 2.0 # (Example for Red LED) target_current = 0.02 # (20mA) resistor_value = (source_voltage - forward_voltage) / target_current print(f"Required Resistor: {resistor_value} Ohms") # Result: 150 Ohms ``` --- ### 4. Common Applications * **Status Indicators:** Power ON/OFF lights on routers or monitors. * **Backlighting:** Small scale illumination for LCD screens or buttons. * **Logic Probes:** Used in DIY electronics to visualize HIGH/LOW signals.