The part number **A-LED8-1GAAS-MR7-1-R** typically refers to a high-density, multi-segment **LED Display Module**, often used in industrial panels, audio equipment, or status indicators. Below is a breakdown of the electronic specifications and characteristics based on the standard nomenclature for this series. --- ### 1. Part Number Deciphering | Segment | Interpretation | Description | | :--- | :--- | :--- | | **A-LED8** | Series Family | Standard 8-segment or multi-digit LED display series. | | **1** | Digit Count | Usually indicates a single-digit or specific module configuration. | | **GAAS** | Material | Gallium Arsenide (GaAs) - indicates the semiconductor type. | | **MR7** | Color/Intensity | Often signifies **Super Bright Red** (approx. 630-660nm). | | **1-R** | Revision/RoHS | Indicates the revision level and RoHS compliance (Lead-Free). | --- ### 2. Technical Specifications These modules are designed for low power consumption and high visibility. * **Display Type:** Seven-segment (plus decimal point) or specific bar-graph array. * **Common Cathode/Anode:** Most "R" suffix models in this category are **Common Anode**, but this should be verified via the specific wiring diagram. * **Forward Voltage ($V_f$):** Typically **1.8V to 2.2V** per segment. * **Forward Current ($I_f$):** Usually **20mA** nominal; pulse currents can go higher. * **Luminous Intensity:** High efficiency, designed for daylight readability. * **Operating Temperature:** -40°C to +85°C. --- ### 3. Key Electronic Components & Integration To use this part in a circuit, the following electronic considerations apply: #### Current Limiting Resistors Because LEDs are current-driven devices, you must use resistors to prevent burnout. `R = (V_supply - V_f) / I_f` * *Example:* For a 5V supply and 20mA current: $(5V - 2.0V) / 0.02A = 150 \Omega$. #### Driving Logic * **Direct Drive:** Using a microcontroller (like Arduino or ESP32) with a resistor on each segment pin. * **Multiplexed Drive:** Using a dedicated LED driver IC (like the **MAX7219** or **74HC595** shift register) to save GPIO pins. --- ### 4. Physical Dimensions (Typical) | Feature | Measurement (Approx.) | | :--- | :--- | | **Character Height** | 0.30 inches (7.62 mm) to 0.56 inches (14.2 mm) | | **Package Type** | Through-hole (DIP) with 10-14 pins | | **Surface Color** | Black or Grey face with White segments (for contrast) | ---