## SMA5VG-CB2-R Component Overview The **SMA5VG-CB2-R** is a specific electronic component, typically categorized as a **Surface Mount (SMD) LED Display**. These parts are commonly used in instrumentation, consumer electronics, and industrial panels where numeric or alphanumeric information needs to be displayed in a compact form factor. --- ### 1. General Specifications Based on standard naming conventions for this series (often associated with manufacturers like American Bright Optoelectronics), here are the typical technical characteristics: | Parameter | Description | | :--- | :--- | | **Component Type** | 7-Segment LED Display | | **Mounting Type** | Surface Mount Device (SMD) | | **Number of Digits** | Usually 1 (Single Digit) | | **Color** | Green (Standard High Brightness) | | **Common Electrode** | Common Cathode (typically denoted by "C" in suffix) | | **RoHS Status** | Compliant (indicated by "-R") | --- ### 2. Key Electronic Characteristics To integrate this part into a circuit, the following electrical ratings are critical: * **Forward Voltage ($V_f$):** Typically ranges between **2.0V to 2.4V** per segment for Green LEDs. * **Forward Current ($I_f$):** Standard operating current is **20mA** per segment. * **Peak Forward Current:** Often up to **100mA** (at 1/10 duty cycle, 0.1ms pulse width). * **Luminous Intensity:** Measures the brightness, usually rated in millicandela (mcd) at a specific current (e.g., 5-10 mcd @ 10mA). * **Wavelength:** For green units, the dominant wavelength is usually around **570nm**. --- ### 3. Pin Configuration & Logic As a **Common Cathode** device, the internal electronic structure follows this logic: 1. **Cathode:** All the negative terminals of the individual segment LEDs are tied together to a single pin (or multiple pins) which must be connected to Ground (GND). 2. **Anodes:** Each segment (A, B, C, D, E, F, G, and DP) has its own independent positive terminal. 3. **Operation:** To light a segment, a positive voltage (Logic High) must be applied to the specific anode pin through a current-limiting resistor. --- ### 4. Implementation Example When connecting the SMA5VG-CB2-R to a microcontroller (like an Arduino or ESP32), you must use resistors to prevent burning out the LEDs. ```cpp // Example: Calculating Resistor Value // Source Voltage (Vcc) = 5V // LED Forward Voltage (Vf) = 2.1V // Desired Current (I) = 15mA (0.015A) // Formula: R = (Vcc - Vf) / I // R = (5 - 2.1) / 0.015 = 193 Ohms // Use a standard 220 Ohm resistor for safety. ``` --- ### 5. Common Applications * **Digital Clocks:** Small-scale time displays. * **Set-top Boxes:** Channel or status indicators. * **Industrial Meters:** Displaying temperature, pressure, or voltage. * **Household Appliances:** Microwave timers or oven displays.