The **DOM-3027L-HD-R** is a high-sensitivity, omnidirectional electret condenser microphone (ECM) component. It is designed for integration into electronic devices that require audio input, such as security systems, communication devices, or smart home hubs. --- ### 1. Key Technical Specifications The following table highlights the critical electrical and physical parameters of the component: | Feature | Specification | | :--- | :--- | | **Type** | Electret Condenser Microphone (ECM) | | **Directivity** | Omnidirectional (360° sound pickup) | | **Sensitivity** | -27 ± 3 dB (0dB = 1V/Pa) | | **Operating Voltage** | 2.0V (Standard) / 10V (Maximum) | | **Current Consumption** | 0.5 mA (Max) | | **Signal-to-Noise Ratio** | 60 dB | | **Frequency Range** | 50 Hz ~ 16,000 Hz | | **Output Impedance** | 2.2 kΩ | | **Connection Type** | Solder Pads (L-shaped leads/terminals) | | **Dimensions** | 9.7mm (Diameter) x 4.5mm (Height) | --- ### 2. Physical Construction and Pins The DOM-3027L-HD-R typically features a cylindrical aluminum housing with two main connection points on the bottom: * **Terminal 1 (+):** The Output/Power terminal. This requires a pull-up resistor (typically 2.2kΩ) connected to a DC power source. * **Terminal 2 (-):** The Ground terminal. This is usually connected to the outer metal casing of the microphone to provide shielding against electromagnetic interference (EMI). --- ### 3. Application Circuit Diagram To use this component in a circuit, you must provide a DC bias. The basic configuration is as follows: ```text Vcc (e.g., 3V) | [ Rl (2.2k Ohm) ] | +----------||----------> Audio Out (to Amplifier/ADC) | C (1uF) [ Mic ] | GND ``` ### 4. Features and Advantages * **High Sensitivity:** With a rating of -27dB, it is capable of picking up very quiet sounds or sounds from a distance, making it "High Definition" (HD). * **Stability:** The "R" suffix often denotes RoHS compliance, ensuring the part meets environmental standards for lead-free electronics. * **Omnidirectional:** It picks up sound equally from all directions, which is ideal for ambient monitoring but less ideal for noisy environments where you only want to capture a specific voice. ---