The **MA76FAA-R** is a specific part number typically associated with **Quartz Crystal Units** (Resonators), often manufactured by companies like **Seiko Epson** or **Micro Crystal**. These components are fundamental in electronics for providing a stable clock signal or frequency reference. --- ### 1. Technical Specifications The "MA-76" series refers to the physical package and design characteristics. Below is a breakdown of the typical specifications for this component: | Parameter | Typical Specification | | :--- | :--- | | **Component Type** | Quartz Crystal (Resonator) | | **Frequency Range** | Usually 32.768 kHz (Standard for Real-Time Clocks) | | **Package Type** | Cylindrical / Metal Can (Radial Lead) | | **Load Capacitance** | 6.0 pF to 12.5 pF (Standard variants) | | **Frequency Tolerance** | ±20 ppm (Standard) | | **Operating Temperature** | -40°C to +85°C | | **Drive Level** | 1.0 µW Max | --- ### 2. Physical Design and Dimensions The "MA" designation often implies a specific lead configuration or molding. * **Form Factor:** It is a miniature cylindrical crystal. * **Mounting:** Through-hole (Radial leads). The "-R" suffix often indicates "RoHS Compliant" or specific "Tape and Reel" packaging requirements depending on the manufacturer. * **Dimensions:** Approximately 3.0mm x 8.0mm or 2.0mm x 6.0mm depending on the sub-generation. --- ### 3. Functional Role in Circuits The MA76FAA-R acts as a mechanical resonator that vibrates at a precise frequency when an electric voltage is applied (Piezoelectric effect). #### Key Applications: * **Real-Time Clocks (RTC):** Used in digital watches, microwave ovens, and computers to keep track of time even when the device is off. * **Microcontrollers:** Provides the external heartbeat for low-power MCUs that require accurate timing for sleep/wake cycles. * **Communication Devices:** Ensures synchronization in low-speed data transfers. --- ### 4. Circuit Example In a typical oscillator circuit, the crystal is connected between the `OSC_IN` and `OSC_OUT` pins of an IC, accompanied by two load capacitors ($C_1$ and $C_2$). ```cpp // Logic Representation of a Crystal Oscillator Circuit [MCU/IC] | | | +----[ Crystal MA76FAA-R ]----+ | | | +--[ C1 ]--[ GND ] +--[ C2 ]--[ GND ] ``` ---