The **MAH21TBA-R** is a specific electronic component, typically categorized as a **Surface Mount Device (SMD) Quartz Crystal Oscillator**. It is widely used in telecommunications, consumer electronics, and computing to provide a precise frequency reference for microprocessors and digital circuits. --- ### 1. Key Technical Specifications Below are the typical technical parameters associated with this series of oscillators: | Parameter | Specification (Typical) | | :--- | :--- | | **Component Type** | Quartz Crystal Oscillator (SPXO) | | **Package Type** | SMD (Surface Mount Device) | | **Package Size** | 2.5mm x 2.0mm (Typical for MAH series) | | **Output Type** | CMOS / TTL Compatible | | **Supply Voltage (Vcc)** | 1.8V to 3.3V (Variant dependent) | | **Frequency Stability** | ±25ppm to ±50ppm | | **Operating Temperature** | -40°C to +85°C (Industrial Grade) | | **RoHS Status** | Compliant (Lead-Free) | --- ### 2. Functional Components The MAH21TBA-R consists of several internal electronic stages integrated into a single miniature ceramic package: 1. **Quartz Crystal Blank:** The core vibrating element that determines the fundamental frequency through the piezoelectric effect. 2. **Oscillator IC:** An internal integrated circuit that maintains the oscillation of the crystal and buffers the output signal. 3. **Load Capacitors:** Internal capacitors tuned to ensure the crystal oscillates at the precise specified frequency. 4. **Tri-state Function:** The "T" in many part numbers indicates a **Tri-state (Enable/Disable)** function. When the OE (Output Enable) pin is low, the output goes into a high-impedance state, saving power. --- ### 3. Pin Configuration Standard 4-pin SMD oscillators like the MAH series generally follow this layout: * **Pin 1:** Output Enable (OE) or No Connect (NC). * **Pin 2:** Ground (GND). * **Pin 3:** Frequency Output (OUT). * **Pin 4:** Supply Voltage (Vcc). --- ### 4. Common Applications * **Networking:** Used in Ethernet switches and routers for timing synchronization. * **Embedded Systems:** Providing clock signals for ARM or AVR microcontrollers. * **Portable Devices:** Due to its small 2520 footprint, it is ideal for smartphones and tablets. * **PC Peripherals:** USB controllers and high-speed data interfaces. --- ### 5. Part Number Decoding (Typical) * **MAH:** Series identifier (Miniature High Stability). * **21:** Package size code (often refers to 2.5 x 2.0mm). * **T:** Tri-state / Enable-Disable function. * **BA:** Stability/Voltage code (Specific to manufacturer datasheet). * **-R:** Tape and Reel packaging for automated assembly.