The **POM-5238P-R** is a high-sensitivity, omnidirectional electret condenser microphone (ECM) component. It is commonly used in consumer electronics for audio recording, voice recognition, and communication devices. ### 1. Key Technical Specifications The following table summarizes the primary electrical and physical characteristics of the POM-5238P-R: | Parameter | Specification | | :--- | :--- | | **Directivity** | Omnidirectional (picks up sound from all directions) | | **Sensitivity** | -38 ± 3 dB (0dB = 1V/Pa) | | **Operating Voltage** | 2.0V (Standard), up to 10V (Max) | | **Current Consumption** | 0.5 mA (Max) | | **Frequency Range** | 20 Hz – 20,000 Hz | | **Signal-to-Noise Ratio** | > 60 dB | | **Impedance** | 2.2 kΩ | | **Dimensions** | 6.0 mm (Diameter) x 2.7 mm (Height) | | **Connection Type** | Through-hole (Solder Pins) | --- ### 2. Functional Components The "Electronic Parts" inside this component consist of three main layers: * **The Diaphragm:** A thin, metalized plastic film (usually Teflon) that vibrates when hit by sound waves. * **The Backplate:** A rigid plate that acts as the second electrode of the capacitor. * **The JFET (Internal Transistor):** Because the capacitance change is extremely small, a Junction Field-Effect Transistor (JFET) is built inside the metal housing to act as an impedance converter and pre-amplifier. ### 3. Basic Application Circuit To use the POM-5238P-R in a circuit, you must provide a "bias voltage" through a resistor. This allows the internal JFET to function. ```cpp // Schematic Representation VCC (2.0V - 10V) | [RL: 2.2k Load Resistor] | +----------[ C: DC Blocking Capacitor (1uF - 10uF) ]---> Audio Out | [POM-5238P-R] | GND ``` ### 4. Features and Advantages * **Broad Frequency Response:** Capable of capturing high-fidelity audio across the human hearing range. * **Stability:** Designed for consistent performance across temperature fluctuations. * **Compact Size:** The 6mm diameter allows it to fit into small handheld devices or IoT sensors. * **RoHS Compliant:** The "-R" suffix indicates that the part complies with environmental regulations regarding hazardous substances. ---